Alert archive / Iowa / Flash Flood Warnings in 2004

Flash Flood Warning 13, NWS Des Moines, IA

May 22, 2004Black Hawk County, Iowa

NWS Des Moines, IA issued this flash flood warning at May 22, 2004, 10:22 PM CDT for Black Hawk County, Iowa. It was in force for 16 hr. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 22, 2004, 10:22 PM CDT (03:22 UTC)
Expired: May 23, 2004, 2:15 PM CDT
In force: 16 hr
Issued by: NWS Des Moines, IA
Area: Counties, with a storm outline in the text

County Black Hawk County, IA

The radar

The Des Moines radar (KDMX), 148 km from the middle of the area, began a volume at 03:26 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.

What was reported inside it

Time	Report	Where	Remark
May 22, 11:05 PM CDT	FLASH FLOOD	Waterloo, IA	EXTENSIVE STREET FLOODING AT LEAST CURB HIGH...DEEPER IN SOME LOCATIONS.
May 22, 11:20 PM CDT	FLASH FLOOD	Waterloo, IA	KNEE HIGH WATER ON FRANKLIN AVENUE.
May 22, 11:20 PM CDT	HEAVY RAIN 3.25	Evansdale, IA	3.25 INCHES OF RAIN SINCE 10 PM.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.4 hours before the alert went out and 282 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: 642 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 49 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 230323
FFWDMX
IAC013-230715-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1022 PM CDT SAT MAY 22 2004

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BLACK HAWK COUNTY IN NORTHEAST IOWA
  THIS INCLUDES THE CITY OF WATERLOO

* UNTIL 215 AM

* AT 1016 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
THUNDERSTORMS WITH FLASH FLOOD PRODUCING RAINS MOVING INTO BLACK 
HAWK COUNTY.

* THUNDERSTORMS WERE CONTINUOUSLY REDEVELOPING IN CENTRAL 
IOWA...RESULTING IN  EXCESSIVE RAINFALL. RAINFALL RATES WILL AVERAGE 
1 TO 3 INCHES PER HOUR. THIS WILL PRODUCE FLASH FLOODING IN THE 
WATERLOO METRO AREA.

OTHER WARNING LOCATIONS INCLUDE...CEDAR FALLS...DUNKERTON...ELK RUN 
HEIGHTS...EVANSDALE...GILBERTVILLE...HUDSON...AND RAYMOND.

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 4264 9210 4232 9208 4231 9252 4261 9253

$$

GRAMS

1 follow-up statement

000 
WGUS73 KDMX 230419
FFSDMX
IAC009-013-015-027-049-073-077-099-127-153-169-171-230515-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1118 PM CDT SAT MAY 22 2004

...A FLASH FLOOD WARNING CONTINUES FOR TAMA...CARROLL...
GREENE...BOONE...MARSHALL...STORY...JASPER ...POLK...GUTHRIE... 
AUDUBON AND DALLAS COUNTIES UNTIL 1215 AM...AND FOR BLACK HAWK 
COUNTY UNTIL 215 AM.

AT 1109 PM...AMATEUR RADIO AND LAW ENFORCEMENT HAVE REPORTED FLASH 
FLOODING IN STORY...BLACK HAWK...DALLAS...AND AUDUBON COUNTIES SINCE 
10 PM. NUMEROUS ROADS HAVE BEEN CLOSED IN THESE AREAS AND TRAVEL IS 
NOT RECOMMEND IN DALLAS COUNTY. CREEKS IN SOUTHERN STORY COUNTY HAVE 
RISEN TO BANK FULL.

THUNDERSTORMS ARE CONTINUOUSLY REDEVELOPING OVER THE WARNING 
AREA...RESULTING IN EXCESSIVE RAINFALL. RAINFALL RATES WILL AVERAGE 
A HALF INCH TO ONE AND A HALF INCHES PER HOUR. THIS WILL PRODUCE 
FLASH FLOODING IN AREAS THAT HAVE ALREADY SEEN 2 TO 5 INCHES OF 
RAINFALL TONIGHT.

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 4267 9205 4188 9232 4186 9281 4154 9287
          4151 9507 4220 9509 4222 9278 4230 9252
          4263 9252

$$

GRAMS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 22, 7:00 PM CDT	Tornado Warning	DMX	Adair	30 min
May 22, 7:01 PM CDT	Tornado Warning	DMX	Adair	29 min
May 22, 7:04 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	26 min
May 22, 7:06 PM CDT	Tornado Warning	DMX	Polk, Story	54 min
May 22, 7:10 PM CDT	Tornado Warning	DMX	Dallas, Guthrie	50 min
May 22, 7:13 PM CDT	Flash Flood Warning	DMX	Boone, Story	92 min
May 22, 7:14 PM CDT	Tornado Warning	DMX	Audubon	31 min
May 22, 7:14 PM CDT	Tornado Warning	DMX	Greene, Guthrie	46 min
May 22, 7:23 PM CDT	Tornado Warning	DMX	Madison	37 min
May 22, 7:31 PM CDT	Tornado Warning	DMX	Guthrie	44 min
May 22, 7:49 PM CDT	Tornado Warning	DMX	Jasper, Marshall	56 min
May 22, 7:51 PM CDT	Tornado Warning	DMX	Dallas	39 min
May 22, 7:57 PM CDT	Tornado Warning	DMX	Story	33 min
May 22, 8:18 PM CDT	Tornado Warning	DMX	Polk	57 min
May 22, 8:21 PM CDT	Flash Flood Warning	DMX	Audubon, Boone, Carroll, Dallas, Greene, Guthrie and 4 more	16 hr
May 22, 8:29 PM CDT	Tornado Warning	DMX	Dallas	16 min
May 22, 8:31 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Guthrie	44 min
May 22, 8:41 PM CDT	Tornado Warning	DMX	Tama	49 min
May 22, 8:43 PM CDT	Tornado Warning	DMX	Marshall	47 min
May 22, 9:09 PM CDT	Tornado Warning	DMX	Polk, Story	36 min
May 22, 9:14 PM CDT	Tornado Warning	DMX	Dallas	31 min
May 22, 9:16 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	44 min
May 22, 9:27 PM CDT	Tornado Warning	DMX	Marshall, Tama	63 min
May 22, 9:31 PM CDT	Flash Flood Warning	DMX	Tama	15 hr
May 22, 10:00 PM CDT	Severe Thunderstorm Warning	DMX	Cass	45 min
May 22, 10:14 PM CDT	Severe Thunderstorm Warning	DMX	Black Hawk	46 min
May 22, 10:23 PM CDT	Severe Thunderstorm Warning	DMX	Polk, Story	52 min
May 22, 10:24 PM CDT	Severe Thunderstorm Warning	DMX	Adair	36 min
May 22, 10:46 PM CDT	Severe Thunderstorm Warning	DMX	Cass	29 min
May 22, 10:48 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Taylor	57 min
May 22, 10:55 PM CDT	Severe Thunderstorm Warning	DMX	Guthrie	50 min
May 22, 10:57 PM CDT	Severe Thunderstorm Warning	DMX	Adair	48 min
May 22, 11:09 PM CDT	Severe Thunderstorm Warning	DMX	Madison, Ringgold, Union	51 min
May 22, 11:20 PM CDT	Severe Thunderstorm Warning	DMX	Dallas	55 min
May 22, 11:31 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur	44 min
May 22, 11:36 PM CDT	Severe Thunderstorm Warning	DMX	Polk, Warren	54 min
May 22, 11:54 PM CDT	Tornado Warning	DMX	Warren	36 min
May 23, 12:07 AM CDT	Tornado Warning	DMX	Jasper, Marion	53 min
May 23, 12:22 AM CDT	Severe Thunderstorm Warning	DMX	Lucas	23 min
May 23, 12:35 AM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Poweshiek	55 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.