Alert archive / Iowa / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 83, NWS Des Moines, IA

May 25, 2010Adair County, Adams County, Union County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 25, 2010, 5:14 PM CDT for Adair County, Adams County, Union County, Iowa. It was in force for 42 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: May 25, 2010, 5:14 PM CDT (22:14 UTC)
Expired: May 25, 2010, 5:56 PM CDT
In force: 42 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Adair County, IA, Adams County, IA, Union County, IA

The radar

The Des Moines radar (KDMX), 91 km from the middle of the area, began a volume at 22:17 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 12:00Z, 10.2 hours before the alert went out and 160 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: 14 J/kg
Mixed-layer CIN: -360 J/kg
Mixed-layer LCL: 1300 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -47 m²/s²
0-3 km storm-relative helicity: -46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 May 25, 3:35 PM CDT, 1 hour 39 minutes earlier.

Area forecast discussion, May 25, 3:35 PM CDT, 1 hour 39 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
335 PM CDT TUE MAY 25 2010

.SHORT TERM /TONIGHT/...
ONGOING CONVECTION IN WEST...AND APPROACHING COLD FRONT PROVIDED
MAIN FORECAST CONCERN FOR PERIOD. OUTFLOW FROM CONVECTION IN EAST
THIS MORNING/AFTERNOON HAS SPARKED ONGOING CONVECTION IN WEST.
PLENTY OF CAPE AND LIMITED CIN WILL ALLOW FOR CONVECTION TO CONTINUE
THROUGH THE EVENING HOURS. HOWEVER...SHEER IS LIMITED TO
NONEXISTENT...AND SEVERE THREAT WILL PRIMARILY REMAIN WINDS. WITH
LOSS OF DAYTIME HEATING...CONVECTION WILL
DIMINISH...HOWEVER...APPROACHING WEAK COLD FRONT WILL PROVIDE
FORCING MECHANISM FOR PRECIP THROUGH THE OVERNIGHT. RAINFALL
OVERNIGHT WILL BE LOCALLY HEAVY WITH AMPLE MOISTURE...THOUGH
MOISTURE TRANSPORT AND CONVERGENCE IS LIMITED...AND WILL KEEP HEAVY
AMOUNTS ISOLATED. POTENTIAL FOR FLASH FLOODING WILL NEED TO BE
MONITORED...ESPECIALLY IN THE EAST WHICH EXPERIENCED LOCALLY HEAVY
RAINFALL ALREADY TODAY. HAVE TWEAKED OVERNIGHT LOW TEMPERATURES
SLIGHTLY...WITH INCREASING CLOUDS OVERNIGHT...LOWS WILL REMAIN
SLIGHTLY WARMER.

.LONG TERM /WEDNESDAY THROUGH TUESDAY/...
BOUNDARY WILL GRADUALLY SAG OUT OF THE STATE ON WEDNESDAY AS SFC
RIDGING BUILDS INTO THE NORTHERN US.  WILL CONTINUE TO SEE SOME
LINGERING CONVECTION ACRS THE STATE DURING THE DAY...HOWEVER THE
PCPN WILL BE SUPPRESSED FARTHER SOUTH WITH TIME AS BEST MOISTURE AND
INSTABILITY GET SHOVED TO THE SOUTH.  DRY AIR WILL EVENTUALLY WIN
OUT AS THE RIDGING STRENGTHENS ACRS THE NORTHERN MIDWEST.  ANY
LINGERING PCPN INTO WEDNESDAY NIGHT/EARLY THURSDAY WILL BE IN
SOUTHERN IA WITH MUCH OF THE CENTRAL AND NORTH CLEARING OUT IN
INCREASING SUBSIDENCE AND DRY AIR.  THE WEATHER WILL REMAIN QUIET
INTO THE WEEKEND AS UPPER RIDGING PUSHES ACRS THE REGION.
EVENTUALLY...STRONG WESTERN TROF EJECT INTO THE WESTERN HIGH PLAINS
INTO THE LATER HALF OF THE WEEKEND AND PULLS INTO SOUTHERN CANADA.
A COLD FRONT WILL DRAPE ACRS THE STATE BY SUNDAY INTO SUNDAY NIGHT
WITH A THREAT OF THUNDER AT THAT TIME.  THE SYSTEM REMAINS
PROGRESSIVE AND IT APPEARS PCPN CHANCES SHOULD END EARLY MONDAY WITH
DRY CONDITIONS RETURNING INTO EARLY NEXT WEEK.  TEMPERATURES WILL
DROP SOME BEHIND THE CURRENT SYSTEM...BUT IN GENERAL REMAIN AT OR
ABOVE NORMAL INTO THE WEEKEND.

&&

.AVIATION...
25/18Z...MORNING CONVECTION HAD MOSTLY DISSIPATED BY TAF ISSUANCE.
SOME THUNDER PERSISTED NEAR KOTM...AND HAVE THEREFORE LEFT IN CB.
ELSEWHERE...ISOLATED RA AND TSRA MAY DEVELOP IN THE AFTERNOON...BUT
VISIBILITIES AND CEILINGS WILL REMAIN VFR. NEXT CONCERN WILL BE
APPROACHING COLD FRONT WHICH WILL PUSH EASTWARD OVERNIGHT...BRINGING
SHRA TO ALL SITES AFTER 00Z...WHICH WILL LAST THROUGH 12Z. SOME
SITES COULD DROP MVFR...ESPECIALLY KDSM AND KALO TOWARDS THE END OF
THE PERIOD. BUT TIMING AND CEILING HEIGHTS WILL NEED TO BE
REEVALUATED WITH LATER UPDATES

&&

.DMX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

SHORT TERM...WILKINS
LONG TERM...COGIL
AVIATION...WILKINS

Hazardous weather outlook, May 25, 12:19 PM CDT, 4 hours 55 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
1219 PM CDT TUE MAY 25 2010

IAZ004>007-015>017-023>026-033>036-044>047-057>059-070-071-081-092-
261730-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-SAC-CALHOUN-WEBSTER-HAMILTON-
CRAWFORD-CARROLL-GREENE-BOONE-AUDUBON-GUTHRIE-DALLAS-CASS-ADAIR-
ADAMS-TAYLOR-
1219 PM CDT TUE MAY 25 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS WILL DEVELOP THIS AFTERNOON...BECOMING LIKELY BY
THIS EVENING...AND CONTINUING THROUGH TONIGHT. LOCALLY HEAVY
RAINFALL IS EXPECTED. SOME STORMS MAY PRODUCE LOCALLY STRONG
WINDS IN EXCESS OF 50 MPH...ALONG WITH HAIL AS LARGE AS 1 INCH IN
DIAMETER...OR SLIGHTLY LARGER.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

CHANCES FOR NON SEVERE THUNDERSTORMS WILL PERSIST THROUGH
WEDNESDAY. THERE IS ALSO A SLIGHT CHANCE OF THUNDERSTORMS FOR
SUNDAY AND SUNDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED BEGINNING LATER THIS AFTERNOON.

IAZ027-028-037-038-048-049-060-072-073-082-083-093-094-261730-
BUTLER-BREMER-HARDIN-GRUNDY-STORY-MARSHALL-POLK-MADISON-WARREN-UNION-
CLARKE-RINGGOLD-DECATUR-
1219 PM CDT TUE MAY 25 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS WILL DEVELOP THIS AFTERNOON...BECOMING LIKELY BY
THIS EVENING...AND CONTINUING THROUGH TONIGHT. LOCALLY HEAVY
RAINFALL IS EXPECTED WITH LOCALIZED FLOODING POSSIBLE...ESPECIALLY
IN URBAN AND POORLY DRAINED AREAS. SOME STORMS MAY PRODUCE LOCALLY
STRONG WINDS IN EXCESS OF 50 MPH...ALONG WITH HAIL AS LARGE AS 1
INCH IN DIAMETER OR SLIGHTLY LARGER.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY
THUNDERSTORMS WILL REMAIN LIKELY THROUGH WEDNESDAY...WITH CHANCES
TAPERING OFF TOWARD THE SOUTHEAST WEDNESDAY NIGHT AND THURSDAY.
THERE IS ALSO A SLIGHT CHANCE OF THUNDERSTORMS FOR SUNDAY AND
SUNDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED BEGINNING LATER THIS AFTERNOON.

IAZ039-050-061-062-074-075-084>086-095>097-261730-
BLACK HAWK-TAMA-JASPER-POWESHIEK-MARION-MAHASKA-LUCAS-MONROE-WAPELLO-
WAYNE-APPANOOSE-DAVIS-
1219 PM CDT TUE MAY 25 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS WILL DEVELOP THIS AFTERNOON...BECOMING LIKELY BY
THIS EVENING...AND CONTINUING THROUGH TONIGHT. IF HEAVY RAINS DO
OCCUR...THEN LOCALIZED FLOODING IS EXPECTED ESPECIALLY IN AREAS
WHICH EXPERIENCED HEAVY RAINFALL EARLIER TODAY. FLASH FLOODING IS
POSSIBLE...ESPECIALLY IN URBAN AND POORLY DRAINED AREAS. SOME STORMS
MAY PRODUCE LOCALLY STRONG WINDS IN EXCESS OF 50 MPH...ALONG WITH
HAIL AS LARGE AS 1 INCH IN DIAMETER OR SLIGHTLY LARGER.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY
THUNDERSTORMS WILL REMAIN LIKELY THROUGH WEDNESDAY...WITH CHANCES
TAPERING OFF TOWARD THE SOUTHEAST WEDNESDAY NIGHT AND THURSDAY.
THERE IS ALSO A SLIGHT CHANCE OF THUNDERSTORMS FOR SUNDAY AND
SUNDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

ZOGG

In the hours before

Local storm report, May 25, 3:01 PM CDT, 2 hours 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
301 PM CDT TUE MAY 25 2010

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

0301 PM     HAIL             COON RAPIDS             41.87N 94.68W
05/25/2010  E0.88 INCH       CARROLL            IA   UNKNOWN

&&

JJOHNSON

Local storm report, May 25, 3:12 PM CDT, 2 hours 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
312 PM CDT TUE MAY 25 2010

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

0307 PM     HAIL             COON RAPIDS             41.87N 94.68W
05/25/2010  E0.50 INCH       CARROLL            IA   FIRE DEPT/RESCUE

            PEA TO MARBLE SIZED HAIL LASTED A FEW MINUTES.

0307 PM     TSTM WND GST     COON RAPIDS             41.87N 94.68W
05/25/2010  E45.00 MPH       CARROLL            IA   FIRE DEPT/RESCUE

&&

ZOGG

Local storm report, May 25, 4:25 PM CDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
425 PM CDT TUE MAY 25 2010

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

0423 PM     HAIL             1 NW YALE               41.79N 94.37W
05/25/2010  E1.00 INCH       GUTHRIE            IA   EMERGENCY MNGR

&&

FBOKSA

Special weather statement, May 25, 4:29 PM CDT, 45 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
429 PM CDT TUE MAY 25 2010

IAZ004>007-015>017-023>026-034>037-045>048-057>060-070>073-
081>083-092>094-252330-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-CALHOUN-WEBSTER-HAMILTON-
HARDIN-CARROLL-GREENE-BOONE-STORY-AUDUBON-GUTHRIE-DALLAS-POLK-
CASS-ADAIR-MADISON-WARREN-ADAMS-UNION-CLARKE-TAYLOR-RINGGOLD-
DECATUR-
INCLUDING THE CITIES OF...ESTHERVILLE...ALGONA...FOREST CITY...
NORTHWOOD...EMMETSBURG...GARNER...MASON CITY...POCAHONTAS...
HUMBOLDT...CLARION...HAMPTON...ROCKWELL CITY...FORT DODGE...
WEBSTER CITY...ELDORA...CARROLL...JEFFERSON...BOONE...AMES...
AUDUBON...GUTHRIE CENTER...ADEL...DES MOINES...ATLANTIC...
GREENFIELD...WINTERSET...INDIANOLA...CORNING...CRESTON...
OSCEOLA...BEDFORD...MOUNT AYR...LEON
429 PM CDT TUE MAY 25 2010

...STRONG TO SEVERE THUNDERSTORMS EXPECTED OVER PARTS OF WESTERN
AND CENTRAL IOWA INTO THE EARLY EVENING...

SCATTERED SHOWERS AND THUNDERSTORMS IN AREAS FROM CRESTON THROUGH
GREENFIELD...YALE...FORT DODGE AND ALGONA WILL CONTINUE TO SLOWLY
MOVE TO THE EAST LATE THIS AFTERNOON. THE SHOWERS AND
THUNDERSTORMS MAY REACH THE INTERSTATE 35 CORRIDOR TOWARD 600 PM
OR 700 PM.

THE STRONGER STORMS WILL BE CAPABLE OF PRODUCING UP TO QUARTER
SIZED HAIL...DAMAGING WINDS TO 60 MPH...AND VERY HEAVY DOWNPOURS
OF RAIN. VISIBILITIES MAY DROP TO A HALF MILE OR LESS DURING THE
HEAVY RAINS WITH PONDING WATER ON ROADS AND RAPID RISES IN SMALL
STREAMS AND DITCHES. RAINFALL OF AN INCH OR MORE MAY ACCUMULATE IN
AN HOUR.

SMALL

Local storm report, May 25, 4:39 PM CDT, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
439 PM CDT TUE MAY 25 2010

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

0400 PM     HAIL             FONTANELLE              41.29N 94.56W
05/25/2010  E1.00 INCH       ADAIR              IA   EMERGENCY MNGR

&&

FBOKSA

Local storm report, May 25, 4:51 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
451 PM CDT TUE MAY 25 2010

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

0400 PM     FLASH FLOOD      5 WSW GREENFIELD        41.29N 94.55W
05/25/2010                   ADAIR              IA   EMERGENCY MNGR

            TWO FEET OF WATER OVER HIGHWAY 92 NEAR INDIAN AVENUE.
            TIME APPROXIMATE. WATER HAS SINCE SUBSIDED.

&&

SMALL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 11:37 AM CDT	Areal Flood Advisory	DMX	Wapello	119 min
May 25, 2:52 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll, Greene, Guthrie	23 min
May 25, 3:19 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Cass, Guthrie	41 min
May 25, 3:33 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Greene, Guthrie	42 min
May 25, 3:44 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Guthrie	46 min
May 25, 4:19 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Greene, Guthrie	38 min
May 25, 4:46 PM CDT	Flash Flood Warning	DMX	Adair	3 hr
May 25, 5:34 PM CDT	Flash Flood Warning	DMX	Union	4 hr

Nearby

Severe Thunderstorm Warnings in Iowa, 2010 Every 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.