Alert archive / Iowa / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 77, NWS Des Moines, IA

May 13, 2010Appanoose County, Wayne County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 13, 2010, 1:07 AM CDT for Appanoose County, Wayne County, Iowa. It was in force for 38 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 13, 2010, 1:07 AM CDT (06:07 UTC)
Expired: May 13, 2010, 1:45 AM CDT
In force: 38 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Appanoose County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 122 km from the middle of the area, began a volume at 06:08 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
May 12, 11:58 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 6.1 hours before the alert went out and 238 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: 1 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 490 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 452 m²/s²
0-3 km storm-relative helicity: 677 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 13, 12:38 AM CDT, 29 minutes earlier.

Area forecast discussion, May 13, 12:38 AM CDT, 29 minutes before

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Hazardous weather outlook, May 12, 3:51 PM CDT, 9 hours 16 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
351 PM CDT WED MAY 12 2010

IAZ048>050-060>062-072>075-082>086-092>097-132100-
STORY-MARSHALL-TAMA-POLK-JASPER-POWESHIEK-MADISON-WARREN-MARION-
MAHASKA-UNION-CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR-
WAYNE-APPANOOSE-DAVIS-
351 PM CDT WED MAY 12 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

A FLASH FLOOD WATCH IS IN EFFECT FOR THE AREA. PLEASE REFER TO
THE NATIONAL WEATHER SERVICE WEBSITE AT WEATHER.GOV/DESMOINES FOR
FURTHER DETAILS.

STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS EVENING
AND CONTINUE ACROSS THE AREA TONIGHT. LARGE HAIL AND DAMAGING
WINDS WILL BE THE MAIN THREAT WITH THE SEVERE WEATHER. IN ADDITION
TO THE SEVERE WEATHER POTENTIAL...AREAS OF FLASH FLOODING ARE
POSSIBLE AS THE GROUND IS STILL VERY SATURATED FROM THE RAIN
EARLIER IN THE WEEK AND THE RAINFALL AMOUNTS FORECAST FOR TONIGHT
RANGE FROM 2 TO 3 INCHES AND LOCALLY HIGHER AMOUNTS. RIVER FLOODING
MAY ALSO POSE A PROBLEM IN SOME AREAS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME...THOUGH RIVER
FLOODING MAY BE A PROBLEM IN SOME AREAS OVER THE NEXT SEVERAL
DAYS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAYBE NEEDED TONIGHT. RAINFALL REPORTS WOULD
ALSO BE APPRECIATED IN ADDITION TO HAIL AND WIND REPORTS.

IAZ004>007-015>017-023>028-033>039-044>047-057>059-070-071-081-
132100-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN-
WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD-CARROLL-GREENE-
BOONE-AUDUBON-GUTHRIE-DALLAS-CASS-ADAIR-ADAMS-
351 PM CDT WED MAY 12 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...THIS AFTERNOON AND TONIGHT

SCATTERED THUNDERSTORMS ARE POSSIBLE LATE THROUGH TONIGHT. THE
SEVERE THREAT IS LOW...BUT AN ISOLATED SEVERE THUNDERSTORM COULD
PRODUCE LARGE HAIL ALONG AND SOUTH OF HIGHWAY 20. LOCALLY HEAVY
RAIN IS ALSO EXPECTED WERE UP TO 2 INCHES OF NEW RAINFALL MAY
ACCUMULATE BY LATE TONIGHT. AT THIS TIME THE SOIL MOISTURE
SITUATION WOULD ALLOW FOR LOCALLY HEAVY RAINFALL TO OCCUR WITH
MINIMAL WATER ISSUES. SOME MINOR STREET FLOODING OR PONDING OF
WATER WILL OCCUR IN THE HEAVIER STORMS THIS EVENING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED TONIGHT.

REV

In the hours before

Special weather statement, May 12, 7:36 PM CDT, 5 hours 31 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
736 PM CDT WED MAY 12 2010

IAZ028-039-130100-
BLACK HAWK-BREMER-
736 PM CDT WED MAY 12 2010

AT 732 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 4 MILES NORTHWEST OF WATERLOO...MOVING NORTHEAST
AT 50 MPH.

PENNY SIZE HAIL IS POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  DENVER...             READLYN...            ORAN...
  SUMNER...

SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.

MOYER

Special weather statement, May 12, 7:45 PM CDT, 5 hours 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
745 PM CDT WED MAY 12 2010

IAZ061-062-074-075-130115-
JASPER-MAHASKA-MARION-POWESHIEK-
745 PM CDT WED MAY 12 2010

AT 741 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER CENTRAL MARION COUNTY...MOVING NORTHEAST AT
45 MPH.

PENNY SIZE HAIL...BRIEF DOWNPOURS...ARE POSSIBLE WITH THIS STORM.

* THE THUNDERSTORM WILL BE NEAR...
  PELLA BY 755 PM CDT...

SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.

MOYER

Local storm report, May 12, 7:47 PM CDT, 5 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
747 PM CDT WED MAY 12 2010

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

0740 PM     HAIL             2 NE KNOXVILLE AIRPORT  41.32N 93.09W
05/12/2010  E0.75 INCH       MARION             IA   TRAINED SPOTTER

            HAIL WAS REPORTED AT THE INTERSECTION OF EAST MARION AND
            SOUTH ATTICA ROAD.

&&

JH

Local storm report, May 12, 8:22 PM CDT, 4 hours 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
822 PM CDT WED MAY 12 2010

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

0822 PM     HAIL             5 SE WATERLOO           42.43N 92.29W
05/12/2010  E0.75 INCH       BLACK HAWK         IA   TRAINED SPOTTER

&&

JB

Local storm report, May 12, 8:40 PM CDT, 4 hours 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
840 PM CDT WED MAY 12 2010

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

0830 PM     FLASH FLOOD      5 E DES MOINES          41.57N 93.51W
05/12/2010                   POLK               IA   LAW ENFORCEMENT

            HIGHWAY 65 RAMP AT VANDALIA ROAD SOUTH OF PLEASANT HILL
            WAS IMPASSABLE DUE TO HIGH WATER.

0800 PM     FLASH FLOOD      2 SE ALTOONA            41.63N 93.45W
05/12/2010                   POLK               IA   LAW ENFORCEMENT

            NE 38TH/24TH ST NEAR 6TH AVE SE INTERSECTION WASHED OUT.

&&

BMOYER

Local storm report, May 13, 12:00 AM CDT, 1 hour 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
May 12, 7:34 PM CDT	Areal Flood Advisory	DMX	Clarke, Jasper, Lucas, Marion, Polk, Warren	3 hr
May 12, 7:55 PM CDT	Areal Flood Advisory	DMX	Black Hawk, Bremer, Butler, Grundy, Marshall, Tama	3 hr
May 12, 8:43 PM CDT	Areal Flood Advisory	DMX	Poweshiek	3 hr
May 12, 8:54 PM CDT	Flash Flood Warning	DMX	Black Hawk, Bremer, Butler, Grundy	6 hr
May 12, 9:19 PM CDT	River Flood Warning	DMX	Wapello	24 hr
May 12, 9:19 PM CDT	River Flood Warning	DMX	Madison, Warren	24 hr
May 12, 9:19 PM CDT	River Flood Warning	DMX	Lucas, Wayne	36 hr
May 12, 10:26 PM CDT	Areal Flood Advisory	DMX	Jasper, Marion, Polk, Warren	3 hr
May 12, 11:35 PM CDT	Flash Flood Warning	DMX	Appanoose, Davis, Wapello	6 hr
May 13, 10:08 AM CDT	River Flood Warning	DMX	Black Hawk, Bremer, Butler	66 hr
May 13, 10:08 AM CDT	River Flood Warning	DMX	Black Hawk, Butler	48 hr
May 13, 10:17 AM CDT	River Flood Warning	DMX	Mahaska, Marion	4 days

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.