Alert archive / Iowa / Severe Thunderstorm Warnings in 2010
Severe Thunderstorm Warning 323, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 20, 2010, 2:24 PM CDT for Clarke County, Lucas County, Warren County, Iowa. It was in force for 36 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 20, 2010, 2:24 PM CDT (19:24 UTC)
- Expired
- Aug 20, 2010, 3:00 PM CDT
- In force
- 36 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Clarke County, IA, Lucas County, IA, Warren County, IA
The radar
The Des Moines radar (KDMX), 68 km from the middle of the area, began a volume at 19:24 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 20, 1:58 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 7.4 hours before the alert went out and 261 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
- 2447 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 1071 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 4.4
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 20, 12:40 PM CDT, 1 hour 44 minutes earlier.
Area forecast discussion, Aug 20, 12:40 PM CDT, 1 hour 44 minutes before
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</html>Hazardous weather outlook, Aug 20, 5:12 AM CDT, 9 hours 12 minutes before
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</html>In the hours before
Special weather statement, Aug 20, 12:53 PM CDT, 1 hour 31 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1253 PM CDT FRI AUG 20 2010 IAZ028-038-039-049-050-060-061-071>074-082>084-202000- BREMER-GRUNDY-BLACK HAWK-MARSHALL-TAMA-POLK-JASPER-ADAIR-MADISON- WARREN-MARION-UNION-CLARKE-LUCAS- INCLUDING THE CITIES OF...WAVERLY...GRUNDY CENTER...WATERLOO... MARSHALLTOWN...TOLEDO...DES MOINES...NEWTON...GREENFIELD... WINTERSET...INDIANOLA...KNOXVILLE...CRESTON...OSCEOLA...CHARITON 1253 PM CDT FRI AUG 20 2010 ...LOCALLY HEAVY RAIN POSSIBLE THROUGH THE AFTERNOON... A BROKEN LINE OF THUNDERSTORMS EXTENDING FROM NEAR CRESTON NORTHEAST THROUGH THE DES MOINES METRO AREA...BAXTER...MARSHALLTOWN...TRAER...AND INTO THE WATERLOO AND CEDAR FALLS AREA. LOCALLY BRIEF HEAVY RAIN AND OCCASIONAL CLOUD TO GROUND LIGHTNING WILL BE POSSIBLE WITH THIS BAND OF STORMS THROUGH 3 PM CDT. KLP
Special weather statement, Aug 20, 1:49 PM CDT, 35 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 149 PM CDT FRI AUG 20 2010 IAZ072>074-083-201945- CLARKE-MADISON-MARION-WARREN- 149 PM CDT FRI AUG 20 2010 ...SMALL HAIL AND HEAVY DOWNPOURS POSSIBLE... AT 147 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER SOUTHEASTERN MADISON COUNTY...MOVING EAST AT 30 MPH. ONE HALF INCH DIAMETER HAIL...WINDS GREATER THAN 40 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM. * THE THUNDERSTORM WILL BE NEAR... TRURO AND 9 MILES SOUTH OF PATTERSON BY 155 PM CDT... ST. CHARLES BY 200 PM CDT... NEW VIRGINIA AND 9 MILES SOUTH OF BEVINGTON BY 205 PM CDT... ST. MARYS AND 9 MILES SOUTH OF MARTENSDALE BY 210 PM CDT... INDIANOLA BY 225 PM CDT... MILO AND ACKWORTH BY 235 PM CDT... 9 MILES NORTH OF LACONA BY 240 PM CDT... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. PODRAZIK
Local storm report, Aug 20, 2:00 PM CDT, 24 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
200 PM CDT FRI AUG 20 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0155 PM HEAVY RAIN 5 NE WINTERSET 41.40N 93.96W
08/20/2010 M1.80 INCH MADISON IA TRAINED SPOTTER
1.8 INCHES MEASURED SINCE 1130AM
&&
JBSpecial weather statement, Aug 20, 2:20 PM CDT, 4 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 220 PM CDT FRI AUG 20 2010 IAZ073-074-083>085-202015- CLARKE-LUCAS-MARION-MONROE-WARREN- 220 PM CDT FRI AUG 20 2010 ...THUNDERSTORM PRODUCING HAIL AND STRONG WINDS... AT 215 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER CENTRAL CLARKE COUNTY...MOVING EAST AT 35 MPH. PENNY SIZE HAIL...WINDS GREATER THAN 40 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...AND BRIEF HEAVY DOWNPOURS ARE POSSIBLE WITH THIS STORM. * THE THUNDERSTORM WILL BE NEAR... WOODBURN BY 230 PM CDT... 9 MILES NORTH OF DERBY BY 240 PM CDT... LUCAS BY 245 PM CDT... CHARITON AIRPORT AND CHARITON BY 255 PM CDT... WILLIAMSON AND 8 MILES NORTH OF RUSSELL BY 305 PM CDT... 9 MILES SOUTH OF MELCHER-DALLAS BY 310 PM CDT... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. PODRAZIK
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 3:11 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Lucas, Monroe, Wayne | 34 min |
| Aug 20, 3:25 PM CDT | Areal Flood Advisory | DMX | Wapello | 3 hr |
| Aug 20, 3:50 PM CDT | Flash Flood Warning | DMX | Wapello | 6 hr |
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.