Alert archive / Iowa / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 189, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 9, 2009, 7:00 PM CDT for 4 counties in Iowa. It was in force for 45 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
- Aug 9, 2009, 7:00 PM CDT (00:00 UTC)
- Expired
- Aug 9, 2009, 7:45 PM CDT
- In force
- 45 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
Counties Clarke County, IA, Decatur County, IA, Ringgold County, IA, Union County, IA
The radar
The Des Moines radar (KDMX), 97 km from the middle of the area, began a volume at 00:00 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 9, 3:44 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 0.0 hours before the alert went out and 305 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
- 2860 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 928 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 9.6
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 Aug 9, 6:24 PM CDT, 36 minutes earlier.
Area forecast discussion, Aug 9, 6:24 PM CDT, 36 minutes before
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</html>Hazardous weather outlook, Aug 9, 5:14 PM CDT, 1 hour 46 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 514 PM CDT SUN AUG 9 2009 IAZ037>039-050-101200- HARDIN-GRUNDY-BLACK HAWK-TAMA- 514 PM CDT SUN AUG 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TONIGHT SCATTERED STRONG THUNDERSTORMS ARE EXPECTED THIS EVENING AS THEY TRACK TOWARD THE NORTHEAST. SOME STORMS WILL BE SEVERE. LARGE HAIL OF GOLF BALL SIZE...STRONG DAMAGING WINDS...AND LOCALLY HEAVY RAIN ARE THE PRIMARY THREATS. A FLASH FLOOD WATCH IS IN EFFECT FOR THE OUTLOOK AREA THROUGH. PLEASE REFER TO THE NATIONAL WEATHER SERVICE WEBSITE FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED LATE THIS AFTERNOON INTO TONIGHT. IAZ046>049-057>062-070>075-081>086-092>097-101200- GREENE-BOONE-STORY-MARSHALL-AUDUBON-GUTHRIE-DALLAS-POLK-JASPER- POWESHIEK-CASS-ADAIR-MADISON-WARREN-MARION-MAHASKA-ADAMS-UNION- CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR-WAYNE-APPANOOSE- DAVIS- 514 PM CDT SUN AUG 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TONIGHT SCATTERED SEVERE THUNDERSTORMS ARE EXPECTED TO MOVE FROM WEST TO EAST ACROSS CENTRAL AND SOUTHERN IOWA THIS EVENING AND OVERNIGHT. SOME STORMS WILL PRODUCE HAIL OF GOLF BALL SIZE OR GREATER...STRONG DAMAGING WINDS IN EXCESS OF 70 MPH...AND LOCALLY HEAVY RAIN. AN ISOLATED TORNADO IS POSSIBLE...MAINLY SOUTH OF I-80. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED LATE THIS EVENING AND TONIGHT. REV
In the hours before
Local storm report, Aug 9, 6:24 PM CDT, 36 minutes before
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</html>Local storm report, Aug 9, 6:27 PM CDT, 33 minutes before
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</html>Local storm report, Aug 9, 6:29 PM CDT, 31 minutes before
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</html>Local storm report, Aug 9, 6:34 PM CDT, 26 minutes before
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</html>Local storm report, Aug 9, 6:53 PM CDT, 7 minutes before
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</html>Local storm report, Aug 9, 6:55 PM CDT, 5 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 7:32 PM CDT | Areal Flood Advisory | DMX | Clarke, Decatur, Lucas, Wayne | 2 hr |
| Aug 10, 6:04 PM CDT | Areal Flood Advisory | DMX | Black Hawk | 110 min |
| Aug 10, 6:41 PM CDT | Areal Flood Advisory | DMX | Grundy | 74 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2009Every severe thunderstorm warning in 2009
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.