Alert archive / Iowa / Flash Flood Warnings in 2004

Flash Flood Warning 2, NWS Des Moines, IA

May 8, 2004Audubon County, Emmet County, Palo Alto County, Iowa

NWS Des Moines, IA issued this flash flood warning at May 8, 2004, 8:56 PM CDT for Audubon County, Emmet County, Palo Alto County, Iowa. It was in force for 129 days. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 8, 2004, 8:56 PM CDT (01:56 UTC)
Expired
Sep 15, 2004, 1:30 AM CDT
In force
129 days
Issued by
NWS Des Moines, IA
Area
Counties, with a storm outline in the text

Counties Audubon County, IA, Emmet County, IA, Palo Alto County, IA

The radar

The Des Moines radar (KDMX), 96 km from the middle of the area, began a volume at 01:56 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 nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.9 hours before the alert went out and 132 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, Omaha, NE at 00:00Z on 2004-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2163 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2004-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 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
2163 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
2150 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
104 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS53 KDMX 090159
FFWDMX
IAC009-090700-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
856 PM CDT SAT MAY 8 2004

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  AUDUBON COUNTY IN WEST CENTRAL IOWA

* UNTIL 200 AM

* AT 855 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
FLASH   FLOODING PRODUCING THUNDERSTORMS ACROSS MOST OF AUDUBON 
COUNTY.

* THUNDERSTORMS ARE CONTINUOUSLY REDEVELOPING...RESULTING IN   
EXCESSIVE RAINFALL. RAINFALL RATES WILL AVERAGE ONE TO THREE INCHES 
PER HOUR. THIS WILL PRODUCE FLASH FLOODING ACROSS AUDUBON COUNTY.

OTHER WARNING LOCATIONS INCLUDE...
AUDUBON...AUDUBON COUNTY AIRPORT...BRAYTON...EXIRA AND GRAY

AT 845 PM FLASH FLOODING WAS REPORTED NEAR HIGHWAY 71 IN NORTHERN 
PORTIONS OF AUDUBON COUNTY.

FLASH FLOODS OCCUR QUICKLY...MOVE TO HIGHER GROUND. AVOID WATER
COVERED ROADS...THE ROAD MAY BE WASHED OUT. LESS THAN ONE FOOT OF
FAST FLOWING WATER CAN SWEEP AN AUTOMOBILE OFF THE ROAD.

LAT...LON 4185 9477 4152 9472 4152 9505 4186 9510

$$

JAW
1 follow-up statement
000 
WGUS53 KDMX 150136
FFWDMX
IAC063-147-150630-
/X.NEW.KDMX.FF.W.0002.040915T0128Z-040915T0630Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
835 PM CDT TUE SEP 14 2004

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EMMET COUNTY IN NORTHWEST IOWA.
  PALO ALTO COUNTY IN NORTHWEST IOWA.

* UNTIL 130 AM CDT.

* AT 830 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
  DOPPLER RADAR ESTIMATED AROUND 2 INCHES OF RAIN HAS FALLEN SINCE
  630 PM.

* SLOW MOVING THUNDERSTORMS WILL PRODUCE TORRENTIAL RAINFALL OF ONE TO 
  1.5 INCHES PER HOUR ACROSS THE WARNED AREA. RUNOFF FROM THIS 
  EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. 
  SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...ESTHERVILLE...
  EMMETSBURG...ARMSTRONG...AYRSHIRE...CURLEW...CYLINDER...DOLLIVER...
  GRAETTINGER...GRUVER AND MALLARD.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

LAT...LON 4348 9447 4292 9447 4293 9491 4348 9490

$$

JAW

The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 7:03 PM CDTSevere Thunderstorm WarningDMXHamilton, Wright42 min
May 8, 7:05 PM CDTSevere Thunderstorm WarningDMXGuthrie25 min
May 8, 7:14 PM CDTSevere Thunderstorm WarningDMXPolk31 min
May 8, 7:16 PM CDTSevere Thunderstorm WarningDMXCerro Gordo, Franklin59 min
May 8, 7:29 PM CDTTornado WarningDMXDallas, Madison31 min
May 8, 7:32 PM CDTSevere Thunderstorm WarningDMXAudubon, Guthrie28 min
May 8, 7:57 PM CDTFlash Flood WarningDMXGreene, Guthrie, Kossuth129 days
May 8, 7:59 PM CDTSevere Thunderstorm WarningDMXDallas, Madison, Warren46 min
May 8, 8:05 PM CDTSevere Thunderstorm WarningDMXGuthrie40 min
May 8, 8:43 PM CDTSevere Thunderstorm WarningDMXMadison47 min
May 8, 8:46 PM CDTSevere Thunderstorm WarningDMXAdair44 min
May 8, 9:01 PM CDTFlash Flood WarningDMXAdair, Madison, Winnebago129 days
May 8, 9:13 PM CDTSevere Thunderstorm WarningDMXCass47 min
May 8, 9:29 PM CDTSevere Thunderstorm WarningDMXMadison31 min
May 8, 9:41 PM CDTSevere Thunderstorm WarningDMXAdair49 min
May 8, 10:01 PM CDTSevere Thunderstorm WarningDMXMadison44 min
May 8, 10:29 PM CDTSevere Thunderstorm WarningDMXUnion46 min

Nearby

Flash Flood Warnings in Iowa, 2004Every flash flood warning in 2004

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.