Alert archive / Iowa / Flash Flood Watches in 2013

Flash Flood Watch 1, NWS Des Moines, IA

April 9, 201316 counties in Iowa

NWS Des Moines, IA issued this flash flood watch at Apr 9, 2013, 4:14 PM CDT for 16 counties in Iowa. It took effect at Apr 10, 2013, 1:00 AM CDT. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Apr 9, 2013, 4:14 PM CDT (21:14 UTC)
In effect from: Apr 10, 2013, 1:00 AM CDT
Expired: Apr 10, 2013, 7:00 PM CDT
In force: 18 hr
Issued by: NWS Des Moines, IA
Flood severity: None

Counties Appanoose County, IA, Black Hawk County, IA, Bremer County, IA, Butler County, IA, Davis County, IA, Decatur County, IA, Grundy County, IA, Lucas County, IA, Mahaska County, IA, Monroe County, IA, Poweshiek County, IA, Ringgold County, IA, Tama County, IA, Taylor County, IA, Wapello County, IA, Wayne County, IA

The radar

The Des Moines radar (KDMX), 69 km from the middle of the area, began a volume at 21:14 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

Davenport, (KDVN), launched 12:00Z, 9.2 hours before the alert went out and 208 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 460 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 291 m²/s²
0-3 km storm-relative helicity: 425 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Apr 9, 12:54 PM CDT, 3 hours 20 minutes earlier.

Area forecast discussion, Apr 9, 12:54 PM CDT, 3 hours 20 minutes before

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Hazardous weather outlook, Apr 9, 4:47 AM CDT, 11 hours 27 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
447 AM CDT TUE APR 9 2013

IAZ004>007-015>017-023>028-033>039-044>050-101100-
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-STORY-MARSHALL-TAMA-
447 AM CDT TUE APR 9 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE POSSIBLE THROUGHOUT THE DAY. SEVERE
WEATHER IS NOT ANTICIPATED AT THIS TIME. SOME STORMS MAY PRODUCE
LOCALLY HEAVY RAINS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

ISOLATED THUNDERSTORMS ARE POSSIBLE WEDNESDAY. SEVERE WEATHER IS
NOT ANTICIPATED...ALTHOUGH A FEW STORMS MAY PRODUCE LOCALLY HEAVY
RAINS. THE PROLONGED PRECIPITATION MAY PRODUCE A FEW INCHES OF
RAIN IN A FEW LOCATIONS BY LATE WEDNESDAY. ALTHOUGH FLOODING IS
NOT ANTICIPATED...CONSIDERABLE PONDING WATER ON ROADS AND IN
DITCHES IS POSSIBLE.

BY WEDNESDAY MORNING AND AGAIN WEDNESDAY NIGHT INTO THURSDAY
MORNING...ACCUMULATIONS OF SNOW OR FREEZING RAIN MAY OCCUR
LEADING TO HAZARDOUS TRAVEL CONDITIONS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED BRIEFLY...BUT OVERALL IS NOT LIKELY.

IAZ057>062-070>075-081>086-092>097-101100-
AUDUBON-GUTHRIE-DALLAS-POLK-JASPER-POWESHIEK-CASS-ADAIR-MADISON-
WARREN-MARION-MAHASKA-ADAMS-UNION-CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-
RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS-
447 AM CDT TUE APR 9 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS ARE LIKELY TODAY...WITH A SLIGHT CHANCE OF SEVERE
WEATHER THIS AFTERNOON. LARGE HAIL WILL BE THE PRIMARY
THREAT...THOUGH SOME STORMS MAY ALSO PRODUCE LOCALLY HEAVY RAINS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

ISOLATED THUNDERSTORMS ARE POSSIBLE WEDNESDAY. SEVERE WEATHER IS
NOT ANTICIPATED...ALTHOUGH A FEW STORMS MAY PRODUCE LOCALLY HEAVY
RAINS. THE PROLONGED PRECIPITATION MAY PRODUCE A FEW INCHES OF
RAIN IN A FEW LOCATIONS BY LATE WEDNESDAY. ALTHOUGH FLOODING IS
NOT ANTICIPATED...CONSIDERABLE PONDING WATER ON ROADS AND IN
DITCHES IS POSSIBLE.

THURSDAY NIGHT AND THURSDAY MORNING...ACCUMULATIONS OF SNOW MAY
OCCUR LEADING TO HAZARDOUS TRAVEL CONDITIONS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON.

AWB

In the hours before

Local storm report, Apr 9, 11:05 AM CDT, 5 hours 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1105 AM CDT TUE APR 09 2013

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

0914 AM     HAIL             2 N DIKE                42.49N 92.63W
04/09/2013  E0.88 INCH       GRUNDY             IA   PUBLIC

            TIME ESTIMATED FROM RADAR.

0919 AM     HAIL             5 W CEDAR FALLS         42.53N 92.56W
04/09/2013  E1.00 INCH       GRUNDY             IA   PUBLIC

            TIME ESTIMATED FROM RADAR.

&&

SKOW

Local storm report, Apr 9, 11:10 AM CDT, 5 hours 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1110 AM CDT TUE APR 09 2013

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

1109 AM     HEAVY RAIN       4 WSW STRATFORD         42.25N 93.99W
04/09/2013  M3.73 INCH       WEBSTER            IA   TRAINED SPOTTER

            STORM TOTAL FOR THE LAST 24 HOURS.

&&

SKOW

Local storm report, Apr 9, 12:43 PM CDT, 3 hours 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1243 PM CDT TUE APR 09 2013

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

0650 AM     HEAVY RAIN       JEFFERSON               42.02N 94.38W
04/09/2013  M1.53 INCH       GREENE             IA   CO-OP OBSERVER

0650 AM     HEAVY RAIN       BEACONSFIELD            40.81N 94.05W
04/09/2013  M2.68 INCH       RINGGOLD           IA   CO-OP OBSERVER

0700 AM     HEAVY RAIN       BONDURANT               42.87N 94.29W
04/09/2013  M1.88 INCH       HUMBOLDT           IA   CO-OP OBSERVER

0700 AM     HEAVY RAIN       JEWELL                  42.31N 93.64W
04/09/2013  M1.02 INCH       HAMILTON           IA   CO-OP OBSERVER

0715 AM     HEAVY RAIN       INDIANOLA               41.36N 93.57W
04/09/2013  M1.33 INCH       WARREN             IA   CO-OP OBSERVER

0735 AM     HEAVY RAIN       GRUNDY CENTER           42.36N 92.77W
04/09/2013  M1.54 INCH       GRUNDY             IA   CO-OP OBSERVER

0750 AM     HEAVY RAIN       CONRAD                  42.22N 92.87W
04/09/2013  M1.97 INCH       GRUNDY             IA   CO-OP OBSERVER

0810 AM     HEAVY RAIN       GUTHRIE CENTER          41.68N 94.50W
04/09/2013  M1.35 INCH       GUTHRIE            IA   CO-OP OBSERVER

0830 AM     HEAVY RAIN       BROOKLYN                41.73N 92.44W
04/09/2013  M1.26 INCH       POWESHIEK          IA   CO-OP OBSERVER

0850 AM     HEAVY RAIN       2 ESE WEBSTER CITY AIRP 42.42N 93.84W
04/09/2013  E2.00 INCH       HAMILTON           IA   TRAINED SPOTTER

1100 AM     HEAVY RAIN       DENISON                 42.02N 95.35W
04/09/2013  M1.18 INCH       CRAWFORD           IA   CO-OP OBSERVER

            STORM TOTAL FOR EVENT.

1155 AM     HEAVY RAIN       EMMETSBURG              43.11N 94.68W
04/09/2013  M1.10 INCH       PALO ALTO          IA   CO-OP OBSERVER

&&

SKOW

Local storm report, Apr 9, 12:59 PM CDT, 3 hours 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
1259 PM CDT TUE APR 09 2013

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

0758 AM     HAIL             3 E STRATFORD           42.27N 93.87W
04/09/2013  E1.00 INCH       HAMILTON           IA   PUBLIC

            HAIL THE SIZE OF A QUARTER TO HALF DOLLAR.

&&

SKOW

Local storm report, Apr 9, 3:07 PM CDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
307 PM CDT TUE APR 09 2013

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

1120 PM     HAIL             2 SSW BEACONSFIELD      40.78N 94.07W
04/08/2013  E1.00 INCH       RINGGOLD           IA   PUBLIC

            DELAYED REPORT...HAIL STILL IN DITCHES THIS MORNING.
            SIDING HOUSES DAMAGED AND PLASTIC ON SHED DAMAGED.
            SCREENS ALSO TORN.

&&

BEERENDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 11:19 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Ringgold, Union	56 min
Apr 9, 7:56 AM CDT	Severe Thunderstorm Warning	DMX	Boone, Hamilton, Webster	34 min
Apr 9, 9:10 AM CDT	Severe Thunderstorm Warning	DMX	Black Hawk, Butler, Grundy	35 min
Apr 9, 9:33 AM CDT	Severe Thunderstorm Warning	DMX	Bremer	27 min
Apr 9, 4:28 PM CDT	Winter Storm Warning	DMX	Emmet, Kossuth, Palo Alto, Winnebago	40 hr
Apr 9, 5:17 PM CDT	Severe Thunderstorm Warning	DMX	Humboldt, Pocahontas, Webster	28 min
Apr 9, 5:44 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Humboldt, Kossuth, Wright	46 min

Nearby

Flash Flood Watches in Iowa, 2013 Every flash flood watch in 2013

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.