Alert archive / Iowa / Areal Flood Advisories in 2009

Areal Flood Advisory 21, NWS Des Moines, IA

July 4, 20095 counties in Iowa

NWS Des Moines, IA issued this areal flood advisory at Jul 4, 2009, 4:02 AM CDT for 5 counties in Iowa. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Jul 4, 2009, 4:02 AM CDT (09:02 UTC)
Expired
Jul 4, 2009, 10:00 AM CDT
In force
6 hr
Issued by
NWS Des Moines, IA
Area
Storm-based polygon

Counties Adair County, IA, Adams County, IA, Clarke County, IA, Madison County, IA, Union County, IA

The radar

The Des Moines radar (KDMX), 78 km from the middle of the area, began a volume at 09:04 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

Topeka, KS (KTOP), launched 00:00Z, 9.0 hours before the alert went out and 267 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-pSkew-T log-p diagram, Topeka, KS at 00:00Z on 2009-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 969 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 00:00Z on 2009-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 252 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
969 J/kg
Mixed-layer CIN
-177 J/kg
Mixed-layer LCL
933 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
252 m²/s²
0-3 km storm-relative helicity
458 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory 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 areal flood advisory went out at Jul 4, 3:23 AM CDT, 39 minutes earlier.

Area forecast discussion, Jul 4, 3:23 AM CDT, 39 minutes before
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Hazardous weather outlook, Jul 3, 4:25 PM CDT, 11 hours 37 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DES MOINES IA
425 PM CDT FRI JUL 3 2009

IAZ070-071-081>083-092>096-041100-
CASS-ADAIR-ADAMS-UNION-CLARKE-TAYLOR-RINGGOLD-DECATUR-WAYNE-
APPANOOSE-
425 PM CDT FRI JUL 3 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA
ALONG AND SOUTH OF A LINE FROM ATLANTIC TO OSCEOLA AND OTTUMWA.

.DAY ONE...TONIGHT

THUNDERSTORMS WILL SPREAD ACROSS IOWA TONIGHT. THERE IS A LOW
THREAT FOR SEVERE WEATHER WITH THE PRIMARY THREAT FOR HAIL UP TO
QUARTER SIZE. ADDITIONALLY...HEAVY RAINFALL IS FORECAST OVERNIGHT
WITH AMOUNTS IN THE ONE AND TWO INCH RANGE WITH LOCALIZED AREAS RECEIVING
AROUND 3 INCHES OF RAIN.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SCATTERED THUNDERSTORMS WILL BE POSSIBLE DURING THE MORNING
SATURDAY NO SEVERE WEATHER IS EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING. ANY HEAVY RAINFALL
REPORTS WOULD ALSO BE APPRECIATED.

IAZ044>050-057>062-072>075-084>086-097-041100-
CRAWFORD-CARROLL-GREENE-BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-
DALLAS-POLK-JASPER-POWESHIEK-MADISON-WARREN-MARION-MAHASKA-LUCAS-
MONROE-WAPELLO-DAVIS-
425 PM CDT FRI JUL 3 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA
BETWEEN HIGHWAY 92 AND HIGHWAY 30.

.DAY ONE...TONIGHT

SCATTERED NON SEVERE THUNDERSTORMS WILL OCCUR OVERNIGHT.  HEAVY
RAINFALL IS FORECAST AS WELL OVERNIGHT WITH AMOUNTS IN THE ONE AND
TWO INCH RANGE WITH LOCALIZED AREAS RECEIVING AROUND 3 INCHES OF
RAIN. LOCALIZED FLOODING MAY RESULT FROM THE HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SCATTERED THUNDERSTORMS WILL BE POSSIBLE DURING SATURDAY MORNING.
NO SEVERE WEATHER IS EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED THIS EVENING. HOWEVER...REPORTS
OF HEAVY RAINFALL WOULD BE APPRECIATED.

IAZ004>007-015>017-023>028-033>039-041100-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN-
WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-
425 PM CDT FRI JUL 3 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA
ALONG AND NORTH OF HIGHWAY 20.

.DAY ONE...TONIGHT

SCATTERED NON SEVERE THUNDERSTORMS ARE EXPECTED TONIGHT. SOME
AREAS OF HEAVY RAINFALL UP TO ONE INCH WITH ISOLATED HIGHER
AMOUNTS WILL BE POSSIBLE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED. HOWEVER...ANY REPORTS OF HEAVY
RAINFALL WOULD BE APPRECIATED.

CC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 2:31 AM CDTAreal Flood AdvisoryDMXCass6 hr
Jul 4, 5:44 AM CDTAreal Flood AdvisoryDMXAppanoose, Davis, Decatur, Wayne6 hr
Jul 4, 8:52 AM CDTRiver Flood WarningDMXDecatur43 hr
Jul 4, 8:52 AM CDTRiver Flood WarningDMXAppanoose, Wayne27 hr
Jul 4, 11:17 AM CDTAreal Flood WarningDMXAdair, Adams, Clarke, Decatur, Madison, Union and 1 more6 hr
Jul 4, 1:10 PM CDTRiver Flood WarningDMXLucas, Wayne26 hr

Nearby

Areal Flood Advisories in Iowa, 2009Every areal flood advisory 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.