Alert archive / Iowa / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 186, NWS Des Moines, IA

August 9, 2009Ringgold County, Taylor County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 9, 2009, 6:28 PM CDT for Ringgold County, Taylor County, Iowa. It was in force for 47 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, 6:28 PM CDT (23:28 UTC)
Expired
Aug 9, 2009, 7:15 PM CDT
In force
47 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon

Counties Ringgold County, IA, Taylor County, IA

The radar

The Des Moines radar (KDMX), 127 km from the middle of the area, began a volume at 23:28 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.

IssuedProductOfficeLasted
Aug 9, 3:44 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.5 hours before the alert went out and 172 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.

Skew-T log-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 2009-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1138 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2009-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1138 J/kg
Mixed-layer CIN
-213 J/kg
Mixed-layer LCL
726 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.9

Open this sounding in Storm Lab

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, 4 minutes earlier.

Area forecast discussion, Aug 9, 6:24 PM CDT, 4 minutes before
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Hazardous weather outlook, Aug 9, 5:14 PM CDT, 1 hour 14 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, 6:09 PM CDT, 19 minutes before
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Local storm report, Aug 9, 6:11 PM CDT, 17 minutes before
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Local storm report, Aug 9, 6:12 PM CDT, 16 minutes before
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Local storm report, Aug 9, 6:23 PM CDT, 5 minutes before
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Local storm report, Aug 9, 6:24 PM CDT, 4 minutes before
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Local storm report, Aug 9, 6:27 PM CDT, 1 minute before
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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 7:32 AM CDTSevere Thunderstorm WarningDMXCrawford, Sac43 min
Aug 9, 8:10 AM CDTSevere Thunderstorm WarningDMXCalhoun, Carroll, Crawford, Greene, Sac50 min
Aug 9, 8:50 AM CDTSevere Thunderstorm WarningDMXCalhoun, Webster55 min
Aug 9, 9:30 AM CDTSevere Thunderstorm WarningDMXHamilton, Webster, Wright60 min
Aug 9, 9:45 AM CDTSevere Thunderstorm WarningDMXBoone, Hamilton, Story45 min
Aug 9, 10:07 AM CDTSevere Thunderstorm WarningDMXFranklin, Grundy, Hamilton, Hardin, Marshall, Story53 min
Aug 9, 10:38 AM CDTSevere Thunderstorm WarningDMXBlack Hawk, Butler, Grundy, Marshall, Tama67 min
Aug 9, 11:05 AM CDTTornado WarningDMXBlack Hawk, Grundy40 min
Aug 9, 11:46 AM CDTSevere Thunderstorm WarningDMXBlack Hawk18 min
Aug 9, 3:35 PM CDTFlash Flood WatchDMXBlack Hawk, Bremer, Grundy, Hardin, Tama5 hr
Aug 9, 4:00 PM CDTSevere Thunderstorm WarningDMXCass45 min
Aug 9, 4:24 PM CDTSevere Thunderstorm WarningDMXAdair36 min
Aug 9, 5:06 PM CDTSevere Thunderstorm WarningDMXDallas39 min
Aug 9, 5:18 PM CDTSevere Thunderstorm WarningDMXAdair, Clarke, Madison, Union, Warren57 min
Aug 9, 5:26 PM CDTSevere Thunderstorm WarningDMXPolk49 min
Aug 9, 5:49 PM CDTSevere Thunderstorm WarningDMXMarion, Warren41 min
Aug 9, 5:52 PM CDTSevere Thunderstorm WarningDMXAdams, Taylor38 min
Aug 9, 5:53 PM CDTSevere Thunderstorm WarningDMXJasper, Marshall, Polk52 min
Aug 9, 6:04 PM CDTAreal Flood AdvisoryDMXPolk, Warren2 hr
Aug 9, 6:15 PM CDTSevere Thunderstorm WarningDMXClarke, Lucas, Warren45 min
Aug 9, 6:17 PM CDTSevere Thunderstorm WarningDMXClarke, Decatur, Ringgold, Union43 min
Aug 9, 6:25 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion, Poweshiek50 min
Aug 9, 6:33 PM CDTSevere Thunderstorm WarningDMXJasper, Marshall, Poweshiek, Tama57 min
Aug 9, 6:54 PM CDTSevere Thunderstorm WarningDMXMarshall, Tama51 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.