Alert archive / Iowa / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 164, NWS Des Moines, IA

August 3, 2009Dallas County, Guthrie County, Madison County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Aug 3, 2009, 4:53 AM CDT for Dallas County, Guthrie County, Madison County, Iowa. It was in force for 52 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 3, 2009, 4:53 AM CDT (09:53 UTC)
Expired: Aug 3, 2009, 5:45 AM CDT
In force: 52 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon

Counties Dallas County, IA, Guthrie County, IA, Madison County, IA

The radar

The Des Moines radar (KDMX), 43 km from the middle of the area, began a volume at 09:56 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 2, 11:37 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 9.9 hours before the alert went out and 184 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1305 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 2147 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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 3, 3:33 AM CDT, 1 hour 20 minutes earlier.

Area forecast discussion, Aug 3, 3:33 AM CDT, 1 hour 20 minutes before

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Hazardous weather outlook, Aug 2, 8:42 PM CDT, 8 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
842 PM CDT SUN AUG 2 2009

IAZ004>007-015>017-023>028-033>039-040145-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN-
WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-
842 PM CDT SUN AUG 2 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TONIGHT

A SLIGHT RISK OF SEVERE STORMS IS EXPECTED...GENERALLY NORTH OF
HIGHWAY 20 IN NORTHERN IOWA LATE TONIGHT INTO EARLY MONDAY
MORNING. THE MAIN THREAT WILL BE LARGE HAIL UP TO THE SIZE OF GOLF
BALLS AND DAMAGING WINDS IN EXCESS OF 60 MPH. LOCALLY HEAVY RAIN IS
ALSO POSSIBLE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

SCATTERED THUNDERSTORMS WILL LINGER INTO THE EARLY MORNING HOURS
ON MONDAY...EAST OF INTERSTATE 35 AND NORTH OF INTERSTATE 80
THROUGH SUNRISE. THE MAIN THREAT WILL BE LARGE HAIL UP TO THE SIZE
OF GOLF BALLS AND DAMAGING WIND IN EXCESS OF 60 MPH.

THERE WILL BE LOW CHANCES FOR SHOWERS AND THUNDERSTORMS STARTING
TUESDAY NIGHT LASTING RIGHT INTO NEXT WEEKEND. THE BETTER CHANCES
CURRENTLY APPEAR TO BE AREA WIDE LATE WEDNESDAY...AND THEN AGAIN
THURSDAY INTO SATURDAY. THE SEVERE WEATHER POTENTIAL FOR THIS
PERIOD WILL BE BETTER DETERMINED IN THE COMING DAYS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATE TONIGHT THROUGH MONDAY
MORNING.

IAZ044>050-057>062-070>075-081>086-092>097-040145-
CRAWFORD-CARROLL-GREENE-BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-
DALLAS-POLK-JASPER-POWESHIEK-CASS-ADAIR-MADISON-WARREN-MARION-
MAHASKA-ADAMS-UNION-CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-RINGGOLD-
DECATUR-WAYNE-APPANOOSE-DAVIS-
842 PM CDT SUN AUG 2 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TONIGHT

CHANCES FOR SHOWERS AND THUNDERSTORMS RETURN TO THE FORECAST
TONIGHT...ESPECIALLY DURING THE LATE EVENING AND OVERNIGHT HOURS.
THE SEVERE WEATHER POTENTIAL IS RATHER LOW. HOWEVER...AN ISOLATED
SEVERE STORM CANNOT BE RULED OUT WITH THE MAIN THREAT OF HAIL AND
BRIEF GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

CHANCES FOR SHOWERS AND NON SEVERE THUNDERSTORMS LINGER INTO MONDAY
MORNING EAST.

THERE WILL BE LOW CHANCES FOR SHOWERS AND THUNDERSTORMS STARTING
TUESDAY NIGHT LASTING RIGHT INTO NEXT WEEKEND. THE BETTER CHANCES
CURRENTLY APPEAR TO BE AREA WIDE LATE WEDNESDAY...AND THEN AGAIN
THURSDAY INTO SATURDAY. THE SEVERE WEATHER POTENTIAL FOR THIS
PERIOD WILL BE BETTER DETERMINED IN THE COMING DAYS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED BRIEFLY EARLY MONDAY MORNING.
OTHERWISE SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

KLP

In the hours before

Local storm report, Aug 3, 2:37 AM CDT, 2 hours 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
237 AM CDT MON AUG 03 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0235 AM     HAIL             BREDA                   42.18N 94.98W
08/03/2009  E0.88 INCH       CARROLL            IA   FIRE DEPT/RESCUE

            PENNY TO NICKEL HAIL. FROM BREDA FD VIA CARROLL COUNTY
            SHERIFF.

&&

SMALL

Special weather statement, Aug 3, 2:43 AM CDT, 2 hours 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
243 AM CDT MON AUG 3 2009

IAZ045-046-030800-
CARROLL-GREENE-
243 AM CDT MON AUG 3 2009

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CARROLL AND NORTHWESTERN
GREENE COUNTIES UNTIL 300 AM CDT...

AT 240 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 5 MILES NORTH OF CARROLL...OR 34 MILES SOUTHEAST
OF IDA GROVE...MOVING EAST AT 40 MPH.

AT 235 AM CDT...PENNY TO NICKEL HAIL WAS REPORTED IN THE TOWN OF
BREDA BY THE LOCAL FIRE DEPARTMENT.

NICKEL SIZE HAIL...AND WINDS IN EXCESS OF 45 MPH ARE EXPECTED WITH
THIS STORM.

PODRAZIK

Special weather statement, Aug 3, 2:57 AM CDT, 1 hour 56 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
257 AM CDT MON AUG 3 2009

IAZ045-046-030830-
CARROLL-GREENE-
257 AM CDT MON AUG 3 2009

...SIGNIFICANT WEATHER ADVISORY FOR GREENE AND NORTHEASTERN CARROLL
COUNTIES UNTIL 330 AM CDT...

AT 256 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR GLIDDEN...OR 39 MILES SOUTHWEST OF FORT
DODGE...MOVING EAST AT 35 MPH.

NICKEL SIZE HAIL...AND WINDS IN EXCESS OF 45 MPH ARE EXPECTED WITH
THIS STORM.

PODRAZIK

Local storm report, Aug 3, 3:10 AM CDT, 1 hour 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
310 AM CDT MON AUG 03 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0307 AM     HAIL             SCHLESWIG               42.16N 95.43W
08/03/2009  E1.00 INCH       CRAWFORD           IA   LAW ENFORCEMENT

            FROM CRAWFORD COUNTY SHERIFF.

&&

SMALL

Local storm report, Aug 3, 3:34 AM CDT, 1 hour 19 minutes before

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Local storm report, Aug 3, 4:46 AM CDT, 7 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 12:25 AM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Pocahontas, Sac	50 min
Aug 3, 12:47 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Calhoun, Carroll, Greene, Hamilton, Humboldt and 4 more	43 min
Aug 3, 1:23 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Carroll, Dallas, Greene, Guthrie, Hamilton and 5 more	35 min
Aug 3, 3:08 AM CDT	Severe Thunderstorm Warning	DMX	Carroll, Crawford, Sac	52 min
Aug 3, 3:25 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Greene	38 min
Aug 3, 4:29 AM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll, Guthrie	46 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2009 Every 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.