Alert archive / Iowa / Severe Thunderstorm Warnings in 2010
Severe Thunderstorm Warning 279, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 22, 2010, 2:24 AM CDT for Palo Alto County, Pocahontas County, Iowa. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 22, 2010, 2:24 AM CDT (07:24 UTC)
- Expired
- Jul 22, 2010, 3:15 AM CDT
- In force
- 51 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Palo Alto County, IA, Pocahontas County, IA
The radar
The Des Moines radar (KDMX), 153 km from the middle of the area, began a volume at 07:25 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 7.4 hours before the alert went out and 225 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1195 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 870 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 168 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.9
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 11:37 PM CDT, 2 hours 47 minutes earlier.
Area forecast discussion, Jul 21, 11:37 PM CDT, 2 hours 47 minutes before
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</html>Hazardous weather outlook, Jul 21, 3:58 PM CDT, 10 hours 26 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 358 PM CDT WED JUL 21 2010 IAZ033>039-044>050-057>062-070>075-222100- SAC-CALHOUN-WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD- CARROLL-GREENE-BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-DALLAS-POLK- JASPER-POWESHIEK-CASS-ADAIR-MADISON-WARREN-MARION-MAHASKA- 358 PM CDT WED JUL 21 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TONIGHT WIDESPREAD THUNDERSTORMS ARE EXPECTED TONIGHT ACROSS MUCH OF THE AREA. SEVERE STORMS ARE POSSIBLE WHERE LARGE HAIL AND DAMAGING WINDS WILL BE THE MAIN THREAT THIS EVENING. IN ADDITION...VERY HEAVY RAINFALL IS ANTICIPATED...ESPECIALLY ACROSS CENTRAL TO NORTHERN IOWA. AREAS OF FLOODING AND FLASH FLOODING ARE POSSIBLE OVERNIGHT TONIGHT. UP TO THREE INCHES OF RAINFALL ARE POSSIBLE WITH THE STORMS AS THEY CROSS THE REGION. SOME LOCATIONS MAY RECEIVE UP TO FIVE INCHES OF RAINFALL. A FLASH FLOOD WATCH AND RIVER FLOOD WARNINGS REMAIN IN EFFECT FOR PORTIONS OF CENTRAL IOWA. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY LINGERING THUNDERSTORMS ARE EXPECTED THURSDAY MORNING WHERE HEAVY RAIN WILL REMAIN A THREAT ACROSS NORTHEAST IOWA. ANOTHER ROUND OF STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE LATE THURSDAY AFTERNOON INTO THURSDAY NIGHT...AND AGAIN FRIDAY EVENING INTO SATURDAY MORNING. THE MAIN THREAT LOOKS TO BE LARGE HAIL AND DAMAGING WINDS BUT UNCERTAINTY REMAINS WITH TIMING AND PLACEMENT WITH THESE SYSTEMS LATER IN THE WEEK AND WILL BE BETTER ASSESSED CLOSER TO EACH EVENT. A FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH NOON THURSDAY AND RIVER FLOOD WARNINGS REMAIN IN EFFECT FOR PORTIONS OF CENTRAL IOWA. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER DETAILS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAYBE NEEDED THIS EVENING INTO THE OVERNIGHT HOURS...WITH ADDITIONAL ACTIVATION PERIODS POSSIBLE THURSDAY AND FRIDAY. REPORTS OF HEAVY RAIN AND FLOODING ARE ALWAYS ENCOURAGED AND APPRECIATED. IAZ004>007-015>017-023>028-222100- EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER- 358 PM CDT WED JUL 21 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...THIS AFTERNOON AND TONIGHT WIDESPREAD THUNDERSTORMS ARE EXPECTED TONIGHT ACROSS MUCH OF THE AREA. SEVERE STORMS ARE POSSIBLE WHERE LARGE HAIL AND DAMAGING WINDS WILL BE THE MAIN THREAT THIS EVENING. IN ADDITION...VERY HEAVY RAINFALL IS ANTICIPATED...ESPECIALLY ACROSS CENTRAL TO NORTHERN IOWA. ONE TO THREE INCHES OF RAINFALL ARE POSSIBLE WITH THE STORMS AS THEY CROSS THE REGION. DUE TO THE DRY SOIL MOISTURE CONDITIONS PRESENT OVER NORTHERN IOWA...THERE IS CURRENTLY ONLY A SMALL THREAT FOR FLASH FLOODING OVERNIGHT. IF THE STORMS BECOME MORE PERSISTENT DURING THE NIGHT HOURS THE THREAT FOR FLASH FLOODING WILL INCREASE ACROSS THE OUTLOOK AREA. RIVER FLOOD WARNINGS REMAIN IN EFFECT FOR PORTIONS OF CENTRAL IOWA. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY LINGERING THUNDERSTORMS ARE EXPECTED THURSDAY MORNING WHERE HEAVY RAIN WILL REMAIN A THREAT ACROSS NORTHEAST IOWA. ANOTHER ROUND OF STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE LATE THURSDAY AFTERNOON INTO THURSDAY NIGHT...AND AGAIN FRIDAY EVENING INTO SATURDAY MORNING. THE MAIN THREAT LOOKS TO BE LARGE HAIL AND DAMAGING WINDS BUT UNCERTAINTY REMAINS WITH TIMING AND PLACEMENT WITH THESE SYSTEMS LATER IN THE WEEK AND WILL BE BETTER ASSESSED CLOSER TO EACH EVENT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAYBE NEEDED THIS EVENING INTO THE OVERNIGHT HOURS...WITH ADDITIONAL ACTIVATION PERIODS POSSIBLE THURSDAY AND FRIDAY. REPORTS OF HEAVY RAIN AND ANY FLOODING ARE ALWAYS ENCOURAGED AND APPRECIATED. IAZ081>086-092>097-222100- ADAMS-UNION-CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR- WAYNE-APPANOOSE-DAVIS- 358 PM CDT WED JUL 21 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TONIGHT ACROSS MUCH OF THE AREA. SEVERE STORMS ARE POSSIBLE WHERE LARGE HAIL AND DAMAGING WINDS WILL BE THE MAIN THREAT THIS EVENING. IN ADDITION...SOME OF THE STORMS MAY PRODUCE VERY HEAVY RAINFALL. THERE IS A RISK OF ISOLATED FLASH FLOODING IF STRONGER AND LONGER LASTING STORMS OCCUR IN THE OUTLOOK AREA. RIVER FLOOD WARNINGS REMAIN IN EFFECT FOR PORTIONS OF CENTRAL IOWA. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY LINGERING THUNDERSTORMS ARE EXPECTED THURSDAY MORNING. ANOTHER ROUND OF STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE LATE THURSDAY AFTERNOON INTO THURSDAY NIGHT...AND AGAIN FRIDAY EVENING INTO SATURDAY MORNING. THE MAIN THREAT LOOKS TO BE LARGE HAIL AND DAMAGING WINDS BUT UNCERTAINTY REMAINS WITH TIMING AND PLACEMENT WITH THESE SYSTEMS LATER IN THE WEEK AND WILL BE BETTER ASSESSED CLOSER TO EACH EVENT. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAYBE NEEDED THIS EVENING INTO THE OVERNIGHT HOURS...WITH ADDITIONAL ACTIVATION PERIODS POSSIBLE THURSDAY AND FRIDAY. REPORTS OF HEAVY RAIN AND FLOODING ARE ALWAYS ENCOURAGED AND APPRECIATED. REV
In the hours before
Special weather statement, Jul 22, 12:25 AM CDT, 1 hour 59 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1225 AM CDT THU JUL 22 2010 IAZ004>006-015-016-023>025-033>035-044-045-220730- EMMET-KOSSUTH-WINNEBAGO-PALO ALTO-HANCOCK-POCAHONTAS-HUMBOLDT- WRIGHT-SAC-CALHOUN-WEBSTER-CRAWFORD-CARROLL- INCLUDING THE CITIES OF...ESTHERVILLE...ALGONA...FOREST CITY... EMMETSBURG...GARNER...POCAHONTAS...HUMBOLDT...CLARION... SAC CITY...ROCKWELL CITY...FORT DODGE...DENISON...CARROLL 1225 AM CDT THU JUL 22 2010 ...POTENTIAL FOR VERY HEAVY RAINFALL INCREASING... NUMEROUS THUNDERSTORMS OVER NORTHWEST IOWA WILL CONTINUE TO MOVE EAST INTO NORTH CENTRAL IOWA THROUGH 2 AM. THESE THUNDERSTORMS ARE CAPABLE OF PRODUCING ONE INCH OF RAIN IN 15 MINUTES AND OVER A LONGER DURATION...2 TO 3 INCHES OVER ONE HOURS. TOTAL RAINFALL AMOUNTS OF 3 TO 5 INCHES ARE LIKELY TO OCCUR OVER PORTIONS OF THE REGION BY DAY BREAK. DONAVON
Special weather statement, Jul 22, 2:18 AM CDT, 6 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 218 AM CDT THU JUL 22 2010 IAZ004>007-015>017-023>026-033>036-044>046-220930- EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-SAC-CALHOUN-WEBSTER-HAMILTON- CRAWFORD-CARROLL-GREENE- INCLUDING THE CITIES OF...ESTHERVILLE...ALGONA...FOREST CITY... NORTHWOOD...EMMETSBURG...GARNER...MASON CITY...POCAHONTAS... HUMBOLDT...CLARION...HAMPTON...SAC CITY...ROCKWELL CITY... FORT DODGE...WEBSTER CITY...DENISON...CARROLL...JEFFERSON 218 AM CDT THU JUL 22 2010 ...HEAVY RAIN POTENTIAL CONTINUES EARLY THIS MORNING... A LARGE AREA OF THUNDERSTORMS WILL CONTINUE TO MEANDER EAST ACROSS MUCH OF NORTH CENTRAL IOWA THROUGH 430 AM CDT. THE MAIN THREAT WITH THESE STORMS IS EXTREMELY HEAVY RAIN AND STRONG GUSTY WINDS IN EXCESS OF 50 MPH AT TIMES. THESE THUNDERSTORMS WILL BE CAPABLE OF PRODUCING ONE INCH OF RAIN WITHIN A 15 TO 20 MINUTE TIME FRAME...AND ROUGHLY 2 TO 4 INCHES WITHIN ABOUT 3 HOUR TIME FRAME OR LESS. TOTAL RAINFALL AMOUNTS OF 3 TO 5 INCHES ARE LIKELY TO OCCUR BY DAY BREAK. KLP
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 3:44 AM CDT | Flash Flood Warning | DMX | Calhoun, Pocahontas, Sac, Webster | 6 hr |
| Jul 22, 3:52 AM CDT | Heat Advisory | DMX | Adair, Adams, Appanoose, Cass, Clarke, Davis and 12 more | 16 hr |
| Jul 22, 3:57 AM CDT | Severe Thunderstorm Warning | DMX | Wright | 33 min |
| Jul 22, 5:54 AM CDT | River Flood Warning | DMX | Humboldt | 4 days |
| Jul 22, 7:22 AM CDT | River Flood Warning | DMX | Boone, Hamilton, Webster | 6 days |
| Jul 22, 7:22 AM CDT | River Flood Warning | DMX | Hamilton, Webster | 70 hr |
| Jul 22, 12:00 PM CDT | River Flood Warning | DMX | Dallas, Greene | 7 days |
| Jul 22, 4:44 PM CDT | River Flood Warning | DMX | Wright | 40 hr |
| Jul 22, 4:44 PM CDT | River Flood Warning | DMX | Black Hawk, Butler | 5 days |
Nearby
Severe Thunderstorm Warnings in Iowa, 2010Every severe thunderstorm warning in 2010
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.