Overview
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A powerful line of severe thunderstorms known as a "Derecho" tracked across eastern Iowa and northwest Illinois on the afternoon of Monday, August 10th resulting in widespread straight line wind damage. A swath of damage from Benton County, through portions of Linn, Jones, Cedar, and Clinton Counties, is consistent with intermittent straight line winds in the 100-130 mph range. Maximum estimated winds were around 140 mph, which caused extensive damage to an apartment complex in southwest Cedar Rapids, IA. The maximum measured unofficial wind gust was 126 mph at Atkins, Iowa in Benton County. Two tornadoes were also confirmed within the widespread swath of wind damage, Both have been designated as EF-U (unknown), as there was no observable damage directly attributable to the tornadoes from which an EF-scale rating could be assigned. A derecho of this intensity is a roughly once-in-a-decade occurrence in this region. Other notable derechos occurred in 1998 and 2011. What is unique about this event, making it even more extreme, is the long duration of the high winds. Many locations experienced sustained high winds and damaging gusts for 30 to 60 minutes, compared to 10 to 20 minutes, which is more common for derechos. One storm-related fatality occurred in the 博体育 Quad Cities area of responsibility. The Linn County Sheriff's Department reports a bicyclist died after being struck by a falling tree. There were numerous injuries reported, especially in the Cedar Rapids area. Storms initially developed in northern Nebraska and southeast South Dakota early in the morning, and quickly intensified as they moved eastward into Iowa. Storms quickly became severe in western Iowa, and produced damaging winds near and around the Des Moines metro. At this point, storms began to tap into an extremely unstable environment, and began producing more widespread wind damage as they tracked through eastern Iowa. The most extreme winds, estimated at 110-140 mph, destroyed or damaged numerous outbuildings, barns, grain bins, homes, mobile homes, apartment buildings, trees, and power poles in parts of Benton, Linn, Jones, Cedar, and Clinton Counties. The Cedar Rapids area was particularly hard hit. Several homes, apartment complexes, and businesses sustained damage consistent with 130-140 mph winds. Radio transmission towers in Marion and Clinton, IA collapsed due to winds estimated around 130 mph. Winds gusts of 80-100 mph were common as the line of storms moved through the Quad Cities area and then through northwest Illinois. A small pocket of winds estimated at 100-110 mph impacted Princeton, IL in Bureau County, where a 150 foot communications tower collapsed and numerous power poles were snapped. In addition to the damage, numerous long-duration power outages occurred across the region, and millions of acres of crops were damaged or destroyed. Numerous semi trucks were also blown off of major highways. NOTE: This information is preliminary. The 博体育 thanks Emergency Management and media partners, as well as the public, for assistance with remote surveys. |
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| Radar Animation From the Advanced Weather Interactive Processing System (AWIPS) display inside KDVN. Severe Thunderstorm Warnings are lined in yellow, with Tornado Warnings in red. |
Graphic showing preliminary peak winds |
Timeline of Watch/Warnings/Reports During Event |
Video from northern Cedar Rapids near intersection of Blairs Ferry Rd and C Ave. Courtesy: Evan Hindman
Photos & Video
博体育 Survey 8/17/20
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| WMT Tower north of Marion,IA (博体育 Survey) |
Marion, IA (博体育 Survey) |
Marion, IA (博体育 Survey) |
northern Cedar county (博体育 Survey) |
Quad Cities IA/IL
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| (Peter Speck) | (Peter Speck) | (Jessica Brooks) | (Kristi Snowbarger) |
Cedar Rapids/Iowa City
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| (Kiah Snow) | (Rebecca Kopelman) | (Rebecca Kopelman) | (Rebecca Kopelman) | (Rebecca Kopelman) |
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| (Sara Flynn) | (David Amelotti) | (Gillian Brooks) |
Ely, IA
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| (Bob Lee) | (Bob Lee) | (Bob Lee) | (Bob Lee) |
Fulton, IL
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| (Larry, Twitter user @wotw824) | (Larry, Twitter user @wotw824) | (Larry, Twitter user @wotw82 |
Additional Photos
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| Kewanee, IL (Tabitha Moore) |
Wheatland, IA (Lindsey Tiemessen) |
Wheatland, IA (Lindsey Tiemessen) |
Clinton, IA (Timothy Dohse) |
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| Donahue, IA (Whitney Kyllo) |
Near Vinton, IA (Darrell Werning) |
Near Vinton, IA (Darrell Werning) |
Near Vinton, IA (Darrell Werning) |
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| Shellsburg, IA (Glenn Rushworth) |
Washington, IA (Caleb Brunty) |
Washington, IA (Caleb Brunty) |
Washington, IA (Caleb Brunty) |
Radar
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| Hourly radar images of the derecho's progression across the region. Image courtesy 博体育 Chicago (). | |||
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| Multi-Radar Multi-Sensor (MRMS) Radar |
Synced Radar and Video Imagery. Radar courtesy: Justin Gibbs, WDTD, Video: courtesy Evan Hindman
Tornadoes:
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Tornado #1- just north of Eastern Iowa Airport
Track Map  
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Tornado #2- just south of Freeport, IL
Track Map 
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The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
| EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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Storm Reports
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PRELIMINARY LOCAL STORM ...SUMMARY
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
929 PM CDT MON AUG 10 2020
..TIME... ...EVENT... ...CITY LOCATION... ....LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0215 PM DMG 1 SSE MORRISON 41.80N 89.96W
08/10/2020 WHITESIDE IL TRAINED SPOTTER
TREE LIMBS DOWN ABOUT 4 TO 6 INCHES IN
DIAMETER OR LARGER IN MORRISON. TIME OF THE
EVENT WAS ESTIMATED USING .
0150 PM DMG MONMOUTH 40.91N 90.65W
08/10/2020 WARREN IL EMERGENCY MNGR
SEVERAL TREES AND POWERLINES DOWN IN TOWN.
TIME OF THE EVENT WAS ESTIMATED USING .
0140 PM DMG LITTLE YORK 41.01N 90.75W
08/10/2020 WARREN IL EMERGENCY MNGR
REPORTED THAT A FEW TREES WERE DOWN IN
LITTLE WORK AS WELL AS LINES. TIME OF
THE EVENT WAS ESTIMATED USING .
0746 PM HEAVY RAIN 2 SE SCIOTO MILLS 42.33N 89.64W
08/10/2020 M2.00 INCH STEPHENSON IL TRAINED SPOTTER
0220 PM DMG FREEPORT 42.30N 89.61W
08/10/2020 STEPHENSON IL EMERGENCY MNGR
1700 PEOPLE WITHOUT IN THE COUNTY,
MANY IN THE CITY OF THE FREEPORT.
STREETS ARE BLOCKED DUE TO DOWN TREES AND
LINES. THE TIME OF THE EVENT WAS
ESTIMATED USING .
0155 PM 2 N WADDAMS GROVE 42.45N 89.88W
08/10/2020 M58 MPH STEPHENSON IL PUBLIC
HOME WEATHER STATION REPORTED 58 MPH GUSTS
AND PEA SIZED .
0135 PM 1 NE FREEPORT 42.30N 89.62W
08/10/2020 E2.00 INCH STEPHENSON IL PUBLIC
REPORTED AT FREEPORT, IL.
0150 PM 3 NNW MOLINE 41.52N 90.51W
08/10/2020 M85 MPH ROCK ISLAND IL
CORRECTS PREVIOUS FROM 3
NNW MOLINE TO AD ADDIITIONAL INFORMATION.
DOT RWIS ON I-74 BRIDGE THERE ARE
REPORTS OF OF POWERLINES AND TREES DOWN IN
ROCK ISLAND AND MOLINE.
0148 PM MOLINE QUAD-CITY AIRPOR 41.45N 90.51W
08/10/2020 M79 MPH ROCK ISLAND IL
0145 PM DMG 1 SSW PORT BYRON 41.61N 90.33W
08/10/2020 ROCK ISLAND IL PUBLIC
PHOTOS OF TREES DOWN IN PORT BYRON
VIA SOCIAL MEDIA. TIME OF THE EVENT WAS
ESTIMATED USING .
0144 PM DMG 1 SSW MOLINE 41.47N 90.50W
08/10/2020 ROCK ISLAND IL EMERGENCY MNGR
TREE LIMBS DOWN NEAR SOUTH PARK MALL.
0135 PM MOLINE QUAD-CITY AIRPOR 41.45N 90.51W
08/10/2020 M77 MPH ROCK ISLAND IL
0135 PM DMG 1 SW SILVIS 41.50N 90.42W
08/10/2020 ROCK ISLAND IL PUBLIC
ESTIMATED TIME BY . LARGE TREE LIMBS
DOWN AND ON TOP OF HOUSES.
0130 PM DMG 2 SSW COAL VALLEY 41.43N 90.46W
08/10/2020 ROCK ISLAND IL PUBLIC
LOCATION ESTIMATED. TREE SNAPPED (1 FOOT
DIAMETER ESTIMATED BY PHOTO).
0128 PM MOLINE QUAD-CITY AIRPOR 41.45N 90.50W
08/10/2020 M68 MPH ROCK ISLAND IL
0128 PM 3 WNW OAK GROVE 41.43N 90.62W
08/10/2020 E60 MPH ROCK ISLAND IL TRAINED SPOTTER
0200 PM DMG CABLE 41.28N 90.50W
08/10/2020 MERCER IL PUBLIC
4 TO 6 INCH TREE DOWN. PICTURE VIA
SOCIAL MEDIA.
0133 PM DMG PREEMPTION 41.32N 90.58W
08/10/2020 MERCER IL PUBLIC
VIA SOCIAL MEDIA. OLD BARN AND OTHER OUT
BUILDINGS WITH ROOFS RIPPED OFF. TIME OF THE
EVENT WAS ESTIMATED USING .
0840 PM HEAVY RAIN 3 N STOCKTON 42.40N 90.00W
08/10/2020 M1.37 INCH JO DAVIESS IL CO-OP OBSERVER
STORM TOTAL.
0146 PM DMG NORA 42.46N 89.94W
08/10/2020 JO DAVIESS IL TRAINED SPOTTER
CORRECTS PREVIOUS DMG FROM
NORA TO CORRECT THE TIME. 6 INCH DIAMETER
TREE DOWN. ESTIMATED WINDS OF 60 TO 70
MPH. TIME OF THE EVENT WAS ESTIMATED USING
.
0215 PM DMG KEWANEE 41.24N 89.93W
08/10/2020 HENRY IL PUBLIC
SEVERAL TREE LIMBS SNAPPED BASED ON PHOTO
ABOUT 4 TO 6 INCHES IN DIAMETER. TRAMPOLINE
WAS BLOWN OVER ON ITS SIDE. TIME OF THE
EVENT WAS ESTIMATED BASED ON AND
DURATION OF WINDS.
0153 PM DMG GENESEO 41.45N 90.15W
08/10/2020 HENRY IL PUBLIC
VIA SOCIAL MEDIA,TWO LARGE TREE LIMBS DOWN
IN THEIR YARD. TIME ESTIMATED USING
AND DURATION.
0230 PM DMG 1 W LOMBARDVILLE 41.24N 89.66W
08/10/2020 BUREAU IL TRAINED SPOTTER
3-4 INCH TREE BRANCHES DOWN, TIME ESTIMATED
FROM .
1238 PM DMG BRIGHTON 41.18N 91.82W
08/10/2020 WASHINGTON IA AMATEUR RADIO
4 INCH FROM A TREE SNAPPED AND OVER
ROADWAY.
0202 PM PARK VIEW 41.69N 90.54W
08/10/2020 E70 MPH SCOTT IA EMPLOYEE
60 TO 70 MPH WINDS ESTIMATED. TIME IS ALSO
ESTIMATED.
0158 PM DMG 1 W RIVERDALE 41.53N 90.49W
08/10/2020 SCOTT IA TRAINED SPOTTER
8 INCH BRANCH SNAPPED AND
ADDITIONAL TREE DAMAGE. ALSO DAMAGE TO WOOD
FENCE.
0152 PM 1 NNW BETTENDORF 41.58N 90.48W
08/10/2020 M68 MPH SCOTT IA PUBLIC
0147 PM DMG 1 MOUNT JOY 41.61N 90.56W
08/10/2020 SCOTT IA EMPLOYEE
4-5 SEMI TRAILERS BLOWN OVER ON HWY 61
BLOCKING TRAFFIC, TIME ESTIMATED FROM .
0145 PM DAVENPORT AIRPORT 41.61N 90.59W
08/10/2020 M86 MPH SCOTT IA
CORRECTS PREVIOUS FROM
DAVENPORT AIRPORT TO AD ADDITIONAL
INFORMATION. TREE LIMBS DOWN AROUND
THE AIRPORT INCLUDING A 3 FOOT WIDE SYCAMORE
TREE THAT WAS PARTIALLY ROTTED. SEVERAL
LARGE TREE LIMBS DOWN. ONE POLE WAS
SNAPPED NEAR THE ENTRANCE TO THE AIRPORT.
0130 PM DMG BETTENDORF 41.56N 90.48W
08/10/2020 SCOTT IA PUBLIC
ESTIMATED LOCATION AND TIME FROM .
LARGE TREES DOWN.
0128 PM DMG 1 NW ELDRIDGE 41.65N 90.59W
08/10/2020 SCOTT IA TRAINED SPOTTER
MULTIPLE TREES DOWN WITH VERY STRONG WINDS.
0128 PM DMG 2 BETTENDORF 41.56N 90.50W
08/10/2020 SCOTT IA PUBLIC
LARGE TREE UPROOTED AND LAYING ACROSS
SOMEONES YARD. LARGE LIMBS THROUGHOUT THE
STREET.
0126 PM DAVENPORT MUNICIPALITY 41.61N 90.58W
08/10/2020 M75 MPH SCOTT IA
OFFICE, RSOIS.
0125 PM DAVENPORT MUNICIPALITY 41.61N 90.58W
08/10/2020 M69 MPH SCOTT IA
60 REPORTED AT DAVENPORT MUNICIPAL
AIRPORT .
0123 PM DMG 2 SW DAVENPORT 41.54N 90.64W
08/10/2020 SCOTT IA PUBLIC
FLAGPOLE BENT OVER.
0115 PM DMG DIXON 41.74N 90.78W
08/10/2020 SCOTT IA PUBLIC
A LOT OF TREE DAMAGE THROUGHOUT THE TOWN.
LARGE TREE LIMBS AND TREES DOWN.
0130 PM DMG 2 NNE NEW ERA 41.49N 90.89W
08/10/2020 MUSCATINE IA PUBLIC
VIA SOCIAL MEDIA...TREES DOWN AND SOFFITT
PEELED BACK ON AN OUTBUILDING NORTH OF
WILDCAT DEN STATE PARK. TIME WAS ESTIMATED
USING .
0115 PM MUSCATINE AIRPORT 41.37N 91.15W
08/10/2020 M58 MPH MUSCATINE IA
0105 PM DMG WEST LIBERTY 41.57N 91.26W
08/10/2020 MUSCATINE IA TRAINED SPOTTER
SEVERAL LARGE TREE BRANCHES DOWN ALONG WITH
SEVERAL FLASHES.
0105 PM DMG 2 ENE MUSCATINE 41.43N 91.03W
08/10/2020 MUSCATINE IA PUBLIC
ESTIMATED LOCATION. DOWNED TREES AND AN
AMATEUR RADIO OPERATOR TOWER WENT DOWN.
0105 PM MUSCATINE 41.42N 91.07W
08/10/2020 E75 MPH MUSCATINE IA TRAINED SPOTTER
ESTIMATING WIND GUSTS TO 75MPH.
0100 PM DMG 1 NNE MUSCATINE 41.44N 91.06W
08/10/2020 MUSCATINE IA PUBLIC
ESTIMATED LOCATION. LARGE TREE DOWN.
0232 PM DMG 3 S CEDAR RAPIDS 41.93N 91.68W
08/10/2020 LINN IA PUBLIC
EXTENSIVE DAMAGE TO BUILDINGS AT THIS
INTERCHANGE.
0107 PM DMG 2 WNW MARION 42.04N 91.63W
08/10/2020 LINN IA TRAINED SPOTTER
NO AND LOTS OF 6-12 INCH DIAMETER
TREES SNAPPED. ESTIMATING 90MPH WINDS.
0106 PM DMG SPRINGVILLE 42.06N 91.44W
08/10/2020 LINN IA PUBLIC
SHINGLES COMPLETELY BLOWN OFF ROOF.
0101 PM DMG 2 E MARION 42.04N 91.55W
08/10/2020 LINN IA TRAINED SPOTTER
DAMAGE TO MOBILE HOMES IN THE AREA OF
INTERSECTION OF HIGHWAYS 13 AND 151.
ESTIMATES OF WIND AROUND 90 MPH.
1258 PM DMG 4 ENE SHELLSBURG 42.12N 91.81W
08/10/2020 LINN IA EMERGENCY MNGR
ESTIMATED GUSTS OVER 100 MPH WITH MULTIPLE
CAMPERS BLOWN OVER, ALONG WITH THE SHELTER
ROOF AT THE PARK BLOWN OFF.
1257 PM DMG 1 S HIAWATHA 42.03N 91.69W
08/10/2020 LINN IA TRAINED SPOTTER
2 DIAMETER TREES UPROOTED. SHINGLES TORN
OFF HOUSE AND OUT.
1256 PM DMG 2 NE MARION 42.05N 91.56W
08/10/2020 LINN IA TRAINED SPOTTER
LARGE BRANCHES DOWN, PLAYGROUND EQUIPMENT
BLOWN OUT OF YARDS.
1255 PM DMG 2 HIAWATHA 42.04N 91.71W
08/10/2020 LINN IA TRAINED SPOTTER
SEVERAL TREES DOWN IN HER NEIGHBORHOOD, TWO
OF WHICH WERE IN HER YARD.
1255 PM 1 S MIDWAY 42.09N 91.70W
08/10/2020 M112 MPH LINN IA EMERGENCY MNGR
1249 PM HIAWATHA 42.05N 91.68W
08/10/2020 E100 MPH LINN IA EMERGENCY MNGR
1243 PM DMG 1 WNW CEDAR RAPIDS 41.98N 91.68W
08/10/2020 LINN IA TRAINED SPOTTER
WIDESPREAD TREE DAMAGE IN CEDAR RAPIDS, WITH
VERY HIGH WINDS. OUTAGES.
1242 PM DMG 2 W CEDAR RAPIDS 41.98N 91.71W
08/10/2020 LINN IA TRAINED SPOTTER
MULTIPLE TREES AND BRANCHES DOWN.
1240 PM DMG 2 S TODDVILLE 42.07N 91.72W
08/10/2020 LINN IA TRAINED SPOTTER
A LOT OF TREE DAMAGE WITH LARGE OAK TREES
SNAPPED HALF WAY UP. AN OUTBUILDING WAS
TOSSED INTO A FIELD AND A LARGE AMOUNT OF
CORN DAMAGE WAS OBSERVED IN THE AREA.
1238 PM DMG HIAWATHA 42.05N 91.68W
08/10/2020 LINN IA TRAINED SPOTTER
ESTIMATED WIND GUSTS UP TO 80 MPH.
1235 PM DMG FAIRFAX 41.92N 91.78W
08/10/2020 LINN IA TRAINED SPOTTER
WINDS IN EXCESS OF 80 MPH WITH LARGE LIMBS
DOWN.
1235 PM DMG 4 NNW 41.92N 91.61W
08/10/2020 LINN IA TRAINED SPOTTER
TREES SNAPPED IN HALF, AROUND 12 INCH
DIAMETER (ESTIMATED BY PHOTOS).
1235 PM DMG 3 NE CEDAR RAPIDS 42.00N 91.64W
08/10/2020 LINN IA TRAINED SPOTTER
LARGE MATURE TREES DOWN AT LINN/BENTON RD.
1234 PM 1 ENE FAIRFAX 41.93N 91.76W
08/10/2020 M74 MPH LINN IA TRAINED SPOTTER
MEASURED WITH HANDHELD .
1232 PM 3 W CEDAR RAPIDS 41.97N 91.74W
08/10/2020 M73 MPH LINN IA TRAINED SPOTTER
LOTS OF TREE DAMAGE WITH A LARGE BIRCH TREE
FALLEN.
1230 PM CEDAR RAPIDS MUNICIPALI 41.89N 91.71W
08/10/2020 M68 MPH LINN IA
1230 PM DMG 2 CEDAR RAPIDS 41.96N 91.71W
08/10/2020 LINN IA PUBLIC
HEAVY DAMAGE REPORTED AT THE HOUSBY HEAVY
EQUIPMENT BUILDING.
1230 PM DMG ALBURNETT 42.15N 91.62W
08/10/2020 LINN IA PUBLIC
ESTIMATED TIME. MAJOR TREE DAMAGE AND
SHINGLES EVERYWHERE.
1230 PM DMG 3 CEDAR RAPIDS 41.96N 91.73W
08/10/2020 LINN IA PUBLIC
LARGE TREES DOWN.
1230 PM DMG 3 ESE HIAWATHA 42.03N 91.64W
08/10/2020 LINN IA PUBLIC
LOCATION IS AT WGAN. SEVERAL TREES DOWN AND
SNAPPED AROUND PROPERTY, ALONG WITH HEAVY
DAMAGE TO SATELLITES AT THEIR BUILDING.
1230 PM DMG 2 SW HIAWATHA 42.03N 91.70W
08/10/2020 LINN IA PUBLIC
ESTIMATED LOCATION. SEVERAL TREES SNAPPED
CLEAN AT THE MIDDLE IN WOODED AREA.
1220 PM DMG FAIRFAX 41.92N 91.78W
08/10/2020 LINN IA PUBLIC
A BUNCH OF DAMAGE DONE TO TREES, ROOFING
MISSING ON SEVERAL BUILDINGS, AND A BUILDING
WAS DESTROYED.
0130 PM DMG 2 NNE STONE CITY 42.14N 91.33W
08/10/2020 JONES IA TRAINED SPOTTER
LOST AN OLD HICKORY TREE AND ANOTHER 18 INCH
DIAMETER TREE WAS BROKEN OFF HALFWAY UP.
STRONG WINDS LASTED UNTIL 2 PM. TIME OF THE
EVENT WAS ESTIMATED USING .
0100 PM DMG OLIN 42.00N 91.14W
08/10/2020 JONES IA PUBLIC
LARGE TREE LIMBS AND FENCES ARE DOWN.
0100 PM DMG 1 E ANAMOSA 42.11N 91.26W
08/10/2020 JONES IA EMERGENCY MNGR
THE EMERGENCY MANAGER RELAYED
REPORTS OF WIDESPREAD TREES, POWERLINES AND
LIMBS DOWN THROUGHOUT THE COUNTY. THE TIME
OF THE EVENT WAS ESTIMATED USING .
0105 PM DMG 2 SE IOWA CITY 41.64N 91.51W
08/10/2020 JOHNSON IA TRAINED SPOTTER
SEVERAL TREE BRANCHES BLOWN TO THE GROUND,
UP TO 3 INCHES IN DIAMETER. NO .
PERSONAL WEATHER STATION RECORDED 69 KNOTS
BEFORE THE WENT OUT.
1252 PM TIFFIN 41.71N 91.68W
08/10/2020 M73 MPH JOHNSON IA TRAINED SPOTTER
MEASURED WITH DAVIS WEATHER STATION.
1245 PM 4 ENE IOWA CITY 41.67N 91.47W
08/10/2020 E70 MPH JOHNSON IA TRAINED SPOTTER
MINOR DAMAGE TO NEW CONSTRUCTION SITES.
1240 PM DMG 1 ESE IOWA CITY 41.65N 91.52W
08/10/2020 JOHNSON IA TRAINED SPOTTER
MULTIPLE TRANSFORMERS HAVE BLOWN, WITH LARGE
TREE LIMBS DOWN IN TOWN.
1239 PM IOWA CITY AIRPORT 41.64N 91.54W
08/10/2020 M69 MPH JOHNSON IA
CORRECTS PREVIOUS FROM
IOWA CITY AIRPORT.
1237 PM DMG 1 NNE OAKDALE 41.71N 91.59W
08/10/2020 JOHNSON IA TRAINED SPOTTER
3 TREES TOPS KNOCKED OUT. MULTIPLE LIMBS
DOWN IN THE AREA.
1235 PM DMG 3 SW CORALVILLE 41.66N 91.63W
08/10/2020 JOHNSON IA PUBLIC
LARGE TREE SNAPPED. 80 LONG TREE THAT WAS
ABOUT A FOOT IN DIAMETER.
1258 PM DMG 2 ESE FAIRFIELD 41.00N 91.94W
08/10/2020 JEFFERSON IA TRAINED SPOTTER
SMALL TO MEDIUM TREE LIMBS DOWN WITHIN TOWN.
1250 PM 1 S FAIRFIELD 40.99N 91.96W
08/10/2020 E70 MPH JEFFERSON IA TRAINED SPOTTER
60-70 MPH WINDS ESTIMATED.
1235 PM FAIRFIELD MUNICIPALITY 41.05N 91.98W
08/10/2020 M60 MPH JEFFERSON IA PUBLIC
1240 PM DMG 2 SSW WILLIAMSBURG 41.64N 92.02W
08/10/2020 IOWA IA TRAINED SPOTTER
LARGE 1 DIAMETER OR LARGER TREES
SNAPPED.
1240 PM AMANA 41.80N 91.88W
08/10/2020 E70 MPH IOWA IA TRAINED SPOTTER
TIME ESTIMATED FROM .
1240 PM DMG AMANA 41.80N 91.87W
08/10/2020 IOWA IA TRAINED SPOTTER
SEVERAL LARGE 12 INCH TREE LIMBS DOWN, TIME
ESTIMATED FROM .
1255 PM MOUNT PLEASANT AIRPORT 40.95N 91.51W
08/10/2020 M58 MPH HENRY IA
0125 PM 1 ENE CASCADE 42.30N 90.99W
08/10/2020 E1.00 INCH DUBUQUE IA TRAINED SPOTTER
0100 PM DMG ASBURY 42.51N 90.75W
08/10/2020 DUBUQUE IA AMATEUR RADIO
70 TALL TREE TOPPLED.
0130 PM DMG 1 E WEST BURLINGTON 40.82N 91.16W
08/10/2020 DES MOINES IA TRAINED SPOTTER
TREES DOWN ACROSS ROAD, TIME ESTIMATED FROM
.
0127 PM DMG MEDIAPOLIS 41.01N 91.16W
08/10/2020 DES MOINES IA TRAINED SPOTTER
TREE BRANCHES DOWN ALL OVER TOWN,
TIME ESTIMATED FROM .
0124 PM DMG DANVILLE 40.86N 91.31W
08/10/2020 DES MOINES IA EMERGENCY MNGR
6 INCH TREE LIMBS DOWN ACROSS LINES.
0122 PM BURLINGTON REGIONAL AIR 40.78N 91.12W
08/10/2020 M60 MPH DES MOINES IA
0200 PM CLINTON AIRPORT 41.83N 90.33W
08/10/2020 M74 MPH CLINTON IA
0200 PM DMG 1 NNE CLINTON 41.85N 90.23W
08/10/2020 CLINTON IA EMERGENCY MNGR
REPORTS OF TREES, LIMBS
ANDPOWERLINES DOWN IN THE COUNTY. CLINTON
SHOWS GUSTS OVER 60 MPH FOR ABOUT 45
MINUTES. TIME OF THE EVENT WAS ESTIMATED
BASED ON AND DURATION.
0147 PM DMG 5 N CLINTON 41.91N 90.23W
08/10/2020 CLINTON IA TRAINED SPOTTER
SIGNIFICANT ROOF DAMAGE AT RADIO STATION
KMCN, WITH ROOFING AND INSULATION MATERIAL
BLOWN INTO ADJACENT FIELD.
0145 PM CLINTON AIRPORT 41.83N 90.33W
08/10/2020 M69 MPH CLINTON IA
0112 PM BENNETT 41.74N 90.97W
08/10/2020 E70 MPH CEDAR IA TRAINED SPOTTER
TREE LIMBS EVERYWHERE.
0105 PM DMG LOWDEN 41.86N 90.92W
08/10/2020 CEDAR IA CO-OP OBSERVER
LARGE TREE BRANCHES BLOWN OFF TREES WITH AN
ESTIMATE AT 60+MPH WINDS.
0100 PM 2 W LIME CITY 41.65N 91.13W
08/10/2020 M61 MPH CEDAR IA
IA-DOT.
1251 PM WEST BRANCH 41.67N 91.35W
08/10/2020 M70 MPH CEDAR IA EMERGENCY MNGR
1244 PM VINTON 42.17N 92.03W
08/10/2020 M70 MPH BENTON IA EMERGENCY MNGR
REPORTED A MEASURED OF 70 MPH.
1231 PM ATKINS 42.00N 91.86W
08/10/2020 E90 MPH BENTON IA LAW ENFORCEMENT
FIRE DEPARTMENT REPORTED WINDS AROUND 90
MPH.
1228 PM 6 NNE VAN HORNE 42.08N 92.03W
08/10/2020 E70 MPH BENTON IA TRAINED SPOTTER
1225 PM BLAIRSTOWN 41.91N 92.08W
08/10/2020 E90 MPH BENTON IA EMERGENCY MNGR
WINDS IN EXCESS OF 90 MPH WITH MAJOR DAMAGE
REPORTED IN TOWN.
1215 PM BELLE PLAINE 41.90N 92.27W
08/10/2020 M70 MPH BENTON IA EMERGENCY MNGR
MULTIPLE SPOTTER REPORTS OF 70+ MPH WINDS
FROM BELLE PLAINE TO LUZERNE.
Wind Reports
...HIGHEST WIND REPORTS AUG 10 (OBSERVING SITES)...
Observations are collected from a variety of sources with varying equipment and exposures.
We thank all volunteer weather observers for their dedication. Not all data listed are
considered official.
Location Speed Time/Date Provider 2 NW Moline 85 MPH 0150 PM 08/10 IADOT Quad City Intl Arpt 79 MPH 0148 PM 08/10 ASOS Clinton Arpt 74 MPH 0200 PM 08/10 AWOS 0.7 W Belle Plaine (UPR) 70 MPH 1215 PM 08/10 MESOWEST Mechanicsville (UPR) 69 MPH 0110 PM 08/10 MESOWEST Cedar Rapids Arpt 68 MPH 1230 PM 08/10 ASOS 0.6 W Lowden (UPR) 63 MPH 0140 PM 08/10 MESOWEST 2 W University Heights 62 MPH 0110 PM 08/10 IADOT 2 W Lime City 62 MPH 0100 PM 08/10 IADOT Burlington Arpt 60 MPH 0122 PM 08/10 ASOS Fairfield Arpt 60 MPH 1235 PM 08/10 AWOS 1 N Williamsburg 60 MPH 1220 PM 08/10 IADOT Mount Pleasant Arpt 58 MPH 1255 PM 08/10 AWOS Muscatine Arpt 58 MPH 0115 PM 08/10 AWOS Savanna Arpt 56 MPH 0155 PM 08/10 AWOS Sterling/Rock Falls Arpt 56 MPH 0226 PM 08/10 AWOS Maquoketa 55 MPH 0140 PM 08/10 IADOT
PRELIMINARY LOCAL STORM ...SUMMARY
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
...SELECT WIND GUST REPORTS OVER 70 MPH...
..TIME... ...EVENT... ...CITY LOCATION... ....LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
0145 PM DAVENPORT AIRPORT 41.61N 90.59W
08/10/2020 M86 MPH SCOTT IA
0126 PM DAVENPORT MUNICIPALITY 41.61N 90.58W
08/10/2020 M75 MPH SCOTT IA
OFFICE, RSOIS.
1255 PM 1 S MIDWAY 42.09N 91.70W
08/10/2020 M112 MPH LINN IA EMERGENCY MNGR
1250 PM 1 S FAIRFIELD 40.99N 91.96W
08/10/2020 E70 MPH JEFFERSON IA TRAINED SPOTTER
60-70 MPH WINDS ESTIMATED.
1249 PM HIAWATHA 42.05N 91.68W
08/10/2020 E100 MPH LINN IA EMERGENCY MNGR
1234 PM 1 ENE FAIRFAX 41.93N 91.76W
08/10/2020 M74 MPH LINN IA TRAINED SPOTTER
MEASURED WITH HANDHELD .
1232 PM 3 W CEDAR RAPIDS 41.97N 91.74W
08/10/2020 M73 MPH LINN IA TRAINED SPOTTER
LOTS OF TREE DAMAGE WITH A LARGE BIRCH TREE
FALLEN.
1252 PM TIFFIN 41.71N 91.68W
08/10/2020 M73 MPH JOHNSON IA TRAINED SPOTTER
MEASURED WITH DAVIS WEATHER STATION.
1245 PM 4 ENE IOWA CITY 41.67N 91.47W
08/10/2020 E70 MPH JOHNSON IA TRAINED SPOTTER
MINOR DAMAGE TO NEW CONSTRUCTION SITES.
0200 PM CLINTON AIRPORT 41.83N 90.33W
08/10/2020 M74 MPH CLINTON IA
0202 PM PARK VIEW 41.69N 90.54W
08/10/2020 E70 MPH SCOTT IA EMPLOYEE
60 TO 70 MPH WINDS ESTIMATED. TIME IS ALSO
ESTIMATED.
0112 PM BENNETT 41.74N 90.97W
08/10/2020 E70 MPH CEDAR IA TRAINED SPOTTER
TREE LIMBS EVERYWHERE.
1251 PM WEST BRANCH 41.67N 91.35W
08/10/2020 M70 MPH CEDAR IA EMERGENCY MNGR
1244 PM VINTON 42.17N 92.03W
08/10/2020 M70 MPH BENTON IA EMERGENCY MNGR
REPORTED A MEASURED OF 70 MPH.
1231 PM ATKINS 42.00N 91.86W
08/10/2020 E90 MPH BENTON IA LAW ENFORCEMENT
FIRE DEPARTMENT REPORTED WINDS AROUND 90
MPH.
1228 PM 6 NNE VAN HORNE 42.08N 92.03W
08/10/2020 E70 MPH BENTON IA TRAINED SPOTTER
1225 PM BLAIRSTOWN 41.91N 92.08W
08/10/2020 E90 MPH BENTON IA EMERGENCY MNGR
WINDS IN EXCESS OF 90 MPH WITH MAJOR DAMAGE
REPORTED IN TOWN.
1215 PM BELLE PLAINE 41.90N 92.27W
08/10/2020 M70 MPH BENTON IA EMERGENCY MNGR
MULTIPLE SPOTTER REPORTS OF 70+ MPH WINDS
FROM BELLE PLAINE TO LUZERNE.
Rain Reports
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Local Rainfall Analysis
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Regional Rainfall Analysis
Courtesy of Midwest Regional Climate Cente |
....IOWA.... Center Junction 2.6 W 2.03 Hopkinton 5.4 WSW 1.98 Fairfax 4.0 NW 1.59 Marshalltown 1 NW 1.42 Dubuque #3 7 SW 1.40 Monticello 1 E 1.37 Dubuque Arpt 1.30 Toledo 3 N 0.88 Perry 0 W 0.84 Charlotte 1.9 WNW 0.83 Boone 1 SSW 0.76 Central City 6.7 W 0.68 Manchester 0.68 Guttenberg Dam 10 0.58 Tipton 0.7 N 0.57 博体育 Johnston* 5 NNW 0.55 Keokuk LD19 0.52 Le Claire LD14 0.51 Nichols 3.2 SSW 0.48 Eldridge 0.6 ESE 0.46 Iowa City 0.45 Asbury 0.4 SW 0.44 Rickardsville 0.2 W 0.43 Muscatine 2N 0.42 Marengo 2.6 SSW 0.42 Dubuque LD11 0.41 Park View 0.2 WSW 0.41 Fayette 1 NW 0.40 Burlington 6.5 SSW 0.38 Oelwein AWOS 0.38 Independence 1.2 N 0.37 Pella 4 N 0.35 Eldridge 0.7 SSW 0.27 Oskaloosa 1 NNW 0.26 Sigourney 0.25 Ainsworth 7.4 N 0.24 Donnellson 0.21 Rathbun Reservoir 2 N 0.20 Burlington Arpt 2 SW 0.20 Elkader 6SSW 0.19 Centerville 0 NE 0.18 Waterloo ASOS 5 NW 0.18 West Point 7.5 NW 0.15 Washington 5.8 SW 0.14 Washington 0.13 Mason City 1 NNE 0.13 Salem 1S 0.11 Salem 3.1 ESE 0.11 Oskaloosa AWOS 9 ESE 0.08 Wapello 5.4 SE 0.07 Morning Sun 1.7 E 0.07 Mason City ASOS 6 W 0.06 Tripoli 0 N 0.06 Waukon 3N 0.05 Columbus Jct 2 SSW 0.04 Hampton 1 N 0.03 Beaconsfield 1 NNE 0.00 Pella AWOS 2 WSW 0.00 ....ILLINOIS.... Orangeville 2.8 NW 3.12 Freeport 1.7 ESE 2.91 Freeport 1.2 E 2.60 Freeport 2.52 Roscoe 2SE 2.48 Freeport 1.7 NW 2.19 Freeport 2.0 NW 1.94 Winslow 4.3 ESE 1.73 Elizabeth 1.49 Lanark 5.3 N 1.47 Ridott 0.1 NE 1.20 Mount Carroll 0.84 Bentley 0.63 Atkinson 2.6 NNE 0.61 Aledo 0.58 Steward 0.56 Jacksonville AWOS 0.55 Macomb 3.8 NW 0.55 Jacksonville 2E 0.55 Galesburg 0.52 Rockford ASOS 0.51 Havana 0.50 Coal Valley 2.6 E 0.50 Geneseo 2.0 NW 0.50 Princeton 0.48 Paw Paw 1 E 0.47 Mundelein 0.46 New Windsor 2.0 N 0.46 Romeoville 0.45 Mendota 2 SE 0.41 Peoria ASOS 0.41 Altona 0.41 Lincoln 博体育 0.40 Kewanee 1 E 0.39 Galesburg Arpt 3 SW 0.39 Galva 2.7 NE 0.38 Colchester 3.5 NE 0.38 Tuscola 0.38 Ogden 0.37 La Harpe 0.35 Alpha 0.7 N 0.34 Dallas City 3.0 SSE 0.34 Alexis 1 SW 0.33 Windsor 0.32 Ottawa 4 SW 0.30 Alpha 2.3 N 0.27 Decatur Airport 0.24 St Anne 0.24 New Boston LD17 0.17 Bloomington Airport 0.17 Oquawka 0.5 N 0.12 Gladstone LD18 0.07 Rochelle AWOS 0.00 ....MISSOURI.... Columbia 1.18 Kirksville ASOS 0.64 Chillicothe 2 NW 0.56 |
Environment
SPC Categorical/Tornado/Hail/Wind Outlooks
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| SPC Categorical Outlook | Tornado Outlook | Wind Outlook | Hail Outlook |
Notable Analysis From The Area
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| Precipitable Water (SPC) | Surface Based CAPE (SPC) | Derecho Composite (SPC) | Microburst Composite (SPC) |
DVN Observed Sounding Analysis
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| 7 AM DAVENPORT, IA SOUNDING | NOON DAVENPORT, IA SOUNDING |
SPC Mesoscale Discussions
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SPC Convective Watches
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Additional Information
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| NASA TERRA satellite MODIS imagery between July 28th, 2020 and August 11th, 2020 showing approximate damage to cropland from derecho. Image courtesy MODIS Today at Univ of Wisconsin - Madison Space Science and Engineering Center | NASA/NOAA Suomi Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band showing the nighttime lights in Iowa. The loop starts on the morning of August 10, 2020 before the derecho as a reference of nighttime lights in Iowa. The following images shows the progression from peak power outages on the morning of August 11 to the gradually and ongoing restoration on the mornings of the 12th, 14th, and 16th. Not all nights were cloudless so 'blurring' of lights may occur in some areas. Courtesy |
Summaries from other 博体育 Offices
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