Strong low pressure in southeast Colorado moved to eastern Iowa during the early afternoon of November 22, 2010. The deepening cyclone then moved to northern Lake Michigan by evening.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS DVN wrote it up.
Strong low pressure in southeast Colorado moved to eastern Iowa during the early afternoon of November 22, 2010. The deepening cyclone then moved to northern Lake Michigan by evening. There was a tremendous thermal gradient with temperatures below zero in the northern Plains, with 60s and 70s from the southern Plains to Lower Michigan. A squall line formed in advance of the intense cold front impacting extreme eastern Iowa and western Illinois. Impressive deep layer shear and very strong wind fields triggered several intense supercells, especially in Illinois. Hail the size of nickels were reported at Wapello, Iowa in Louisa county during the early afternoon.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Quad Cities, IA wrote its last area forecast discussion before the first event at Nov 22, 10:54 AM CST, 1 hour 49 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE QUAD CITIES IA IL 1054 AM CST MON NOV 22 2010 .UPDATE... MAJOR REVISIONS HAVE BEEN DONE TO THE FCST TO REFLECT CURRENT TRENDS. COMBINATION OF 12Z UA AND 15Z DATA INDICATES THE BETTER CHANCES FOR CONVECTION SHOULD BE ROUGHLY IN THE SOUTHERN HALF OF THE CWFA EAST OF THE MISSISSIPPI. GIVEN THE SITUATION IS CHANGING CONSIDERABLY BASED ON NEW ECHOS ON THE REGIONAL RADARS...THE POTENTIAL FOR SEVERE IS THERE. THE SEVERE THREAT SHOULD BE SHORT LIVED WITH THE MAIN LINE FORMING ALONG/EAST OF THE MISSISSIPPI. POTENTIAL FOR RECORD HIGHS MUST ALSO BE ACKNOWLEDGED AS WELL. NEW FCST HAS BEEN SENT. ..08.. && .DVN WATCHES/WARNINGS/ADVISORIES... IA...NONE. IL...NONE. MO...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE QUAD CITIES IA IL 1106 AM CST MON NOV 22 2010 IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007- 009-015>018-024>026-034-035-MOZ009-010-231715- BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON- CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON- HENRY IA-DES MOINES-VAN BUREN-LEE-JO DAVIESS-STEPHENSON-CARROLL- WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-MERCER-HENDERSON- WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK- 1106 AM CST MON NOV 22 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST MISSOURI. .DAY ONE...THIS AFTERNOON AND TONIGHT THE STORM PREDICTION CENTER HAS A SLIGHT RISK OF SEVERE STORMS FOR THIS AFTERNOON. THUNDERSTORMS WILL RAPIDLY DEVELOP THROUGH THE AFTERNOON HOURS AND FORM A LINE ROUGHLY ALONG THE MISSISSIPPI. WARM MOIST AIR AHEAD OF A STRONG COLD FRONT AND WIND SHEAR ALOFT WILL ALLOW STORMS TO BECOME STRONG. THE MAIN THREAT APPEARS TO BE LOCALIZED DAMAGING WINDS AND LARGE HAIL. HOWEVER...IF CONDITIONS BECOME FAVORABLE A BRIEF TORNADO CANNOT BE RULED OUT. THE STORMS WILL BE MOVING QUICKLY AT 45 TO 50 MPH. A TEMPERATURE DROP WILL OCCUR ONCE THE COLD FRONT PASSES ANY LOCATION THIS AFTERNOON OR EVENING. THE TEMPERATURE DROP IS EXPECTED TO BE QUITE LARGE FOR AREAS ALONG AND EAST OF THE MISSISSIPPI. WARM TEMPERATURES...STRONG WINDS...LOW RELATIVE HUMIDITIES...AND DRIED VEGETATION WILL COMBINE TO RESULT IN A VERY HIGH THREAT OF GRASS FIRES THIS AFTERNOON. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON FOR AREAS ALONG AND EAST OF THE MISSISSIPPI.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1201 PM CST MON NOV 22 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1158 AM HAIL MONTROSE 40.53N 91.42W
11/22/2010 E0.25 INCH LEE IA EMERGENCY MNGR
STRONG WINDS ALSO OCCURRING...SPEED UNKNOWN.
&&
WOLFPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1203 PM CST MON NOV 22 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1201 PM HAIL NAUVOO 40.55N 91.38W
11/22/2010 E0.50 INCH HANCOCK IL TRAINED SPOTTER
STRONG NON-SEVERE WINDS.
&&
WOLFPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1225 PM CST MON NOV 22 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1215 PM HAIL 4 SSW CARMAN 40.67N 91.09W
11/22/2010 E2.00 INCH HENDERSON IL TRAINED SPOTTER
&&
WOLFPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1226 PM CST MON NOV 22 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1221 PM HAIL STRONGHURST 40.75N 90.90W
11/22/2010 E0.25 INCH HENDERSON IL FIRE DEPT/RESCUE
&&
WOLFThe Quad Cities radar (KDVN), 70 km away, was scanning. The volume nearest the first event began at 18:41 UTC.
1 hail. Local standard time, as filed.
A trained spotter estimated hail to nickel size along with wind gusts in excess of 50 mph in Wapello.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2010Every state in 2010This day in weather historyWarnings in Iowa, November 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 262799.