Alert archive / Iowa / Flash Flood Warnings in 2004

Flash Flood Warning 41, NWS Des Moines, IA

July 13, 2004Emmet County, Iowa

NWS Des Moines, IA issued this flash flood warning at Jul 13, 2004, 12:37 AM CDT for Emmet County, Iowa. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 13, 2004, 12:37 AM CDT (05:37 UTC)
Expired: Jul 13, 2004, 3:30 AM CDT
In force: 3 hr
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

County Emmet County, IA

The radar

The Sioux Falls radar (KFSD), 164 km from the middle of the area, began a volume at 05:36 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

Minneapolis, MN (KMPX), launched 00:00Z, 5.6 hours before the alert went out and 185 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: 1267 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1215 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KDMX 130540
FFWDMX
IAC063-130830-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1237 AM CDT TUE JUL 13 2004

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

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

* UNTIL 330 AM CDT

* AT 1234 AM CDT...LAW ENFORCEMENT REPORTED THUNDERSTORMS WITH FLASH
  FLOOD PRODUCING RAINS IN THE WARNING AREA.

* SLOW MOVING THUNDERSTORMS PRODUCING TORRENTIAL RAINFALL WILL   
CONTINUE OVER THE NEXT THREE AVERAGE 1 TO 2 INCHES PER HOUR. THIS 
WILL PRODUCE FLASH FLOODING   ALONG THE SMALLER STREAM AND CREEKS.

OTHER WARNING LOCATIONS INCLUDE...
ESTHERVILLE...ESTHERVILLE MUNICIPAL AIRPORT...GRUVER...RINGSTED AND
WALLINGFORD

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 4346 9484 4331 9486 4328 9451 4346 9451

$$

FORSTER

2 follow-up statements

000 
WGUS73 KDMX 130637
FFSDMX
IAC063-130730-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
135 AM CDT TUE JUL 13 2004

...A FLASH FLOOD WARNING CONTINUES FOR EMMET COUNTY UNTIL 330 AM 
CDT...

AT 136 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE THUNDERSTORMS WITH FLASH FLOOD PRODUCING RAINS OVER THE 
AREA.  

SLOW MOVING THUNDERSTORMS PRODUCING HEAVY RAINFALL WILL CONTINUE TO 
AFFECT THE WARNING AREA FOR THE NEXT 1 TO 2 HOURS. RAINFALL RATES 
WILL AVERAGE ONE HALF  TO 1 INCH PER HOUR. THIS WILL PRODUCE FLASH 
FLOODING ALONG THE SMALLER STREAMS AND CREEKS.

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 4329 9488 4328 9446 4347 9451 4347 9489

$$

FORSTER

000 
WGUS73 KDMX 130736
FFSDMX
IAC063-130830-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
235 AM CDT TUE JUL 13 2004

...THE FLASH FLOOD WARNING WHICH WAS IN EFFECT FOR EMMET COUNTY 
UNTIL 330 AM CDT HAS BEEN CANCELLED...

STORMS HAVE MOVED OUT OF THE WARNED AREA...THUS THE WARNING HAS BEEN
CANCELLED.

LAT...LON 4348 9477 4347 9475 4347 9452 4346 9451
      4342 9451 4341 9449 4329 9447 4330 9488
      4348 9488

$$

FORSTER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 11:35 PM CDT	Severe Thunderstorm Warning	DMX	Emmet, Palo Alto	40 min
Jul 13, 12:15 AM CDT	Severe Thunderstorm Warning	DMX	Emmet	45 min
Jul 13, 12:20 AM CDT	Tornado Warning	DMX	Emmet	40 min
Jul 13, 2:33 AM CDT	Severe Thunderstorm Warning	DMX	Kossuth	42 min
Jul 13, 5:07 PM CDT	Severe Thunderstorm Warning	DMX	Adams	23 min

Nearby

Flash Flood Warnings in Iowa, 2004 Every 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.