Alert archive / Iowa / Flash Flood Warnings in 2003
Flash Flood Warning 3, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at May 8, 2003, 8:46 PM CDT for Polk County, Story County, Iowa. It was in force for 6 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
- May 8, 2003, 8:46 PM CDT (01:46 UTC)
- Expired
- May 9, 2003, 2:45 AM CDT
- In force
- 6 hr
- Issued by
- NWS Des Moines, IA
- Area
- Counties, with a storm outline in the text
Counties Polk County, IA, Story County, IA
The radar
The Des Moines radar (KDMX), 18 km from the middle of the area, began a volume at 01:35 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, 1.8 hours before the alert went out and 242 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.
- Mixed-layer CAPE
- 7 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 453 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 571 m²/s²
- 0-3 km storm-relative helicity
- 807 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS53 KDMX 090147
FFWDMX
IAC153-169-090745-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
846 PM CDT THU MAY 8 2003
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
* FLASH FLOOD WARNING FOR...
POLK COUNTY IN CENTRAL IOWA
THIS INCLUDES THE CITY OF DES MOINES
STORY COUNTY IN CENTRAL IOWA
* UNTIL 245 AM
* AT 845 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH FLASH FLOOD PRODUCING RAINS IN THE WARNING AREA.
* THUNDERSTORMS ARE CONTINUOUSLY REDEVELOPING IN SOUTH CENTRAL INTO
SOUTHWEST IOWA RESULTING IN EXCESSIVE RAINFALL. RAINFALL RATES
WILL AVERAGE 1 INCH PER HALF HOUR. THIS WILL PRODUCE FLASH
FLOODING ALONG SMALL STREAMS AND CREEKS IN THE WARNING AREA
OTHER WARNING LOCATIONS INCLUDE...
ALLEMAN...ALTOONA...AMES...AMES MUNICIPAL AIRPORT...ANKENY...ANKENY
REGIONAL AIRPORT...BONDURANT...CAMBRIDGE...COLO...DES MOINES
MORNINGSTAR AIRPORT...ELKHART...GILBERT...HUXLEY...JOHNSTON...
KELLEY...MAXWELL...MCCALLSBURG...MITCHELLVILLE...NEVADA...PLEASANT
HILL...POLK CITY...ROLAND...SAYLORVILLE...SHELDAHL...SLATER...STORY
CITY...URBANDALE...WEST DES MOINES...WINDSOR HEIGHTS AND ZEARING
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 4153 9378 4152 9335 4187 9335 4219 9325
4221 9368
KULA
$$4 follow-up statements
000
WGUS73 KDMX 090247
FFSDMX
IAC153-169-090845-
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
943 PM CDT THU MAY 8 2003
...A FLASH FLOOD WARNING CONTINUES FOR STORY AND POLK COUNTIES UNTIL
245 AM...
AT 943 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
NEWLY DEVELOPED THUNDERSTORMS FROM WINTERSET THROUGH OSCEOLA AND
LAMONI MOVING NORTHEAST AT 45 MPH INTO THE WARNED AREA. ADDITIONAL
LOCAL RAINFALL OF ONE HALF TO ONE INCH IS LIKELY THROUGH 11
PM...WITH THE POSSIBILITY OF ADDITIONAL STORMS MOVING IN THROUGH
EARLY FRIDAY MORNING. THIS WILL PRODUCE LOCALIZED URBAN FLASH
FLOODING IN THE DES MOINES METRO...WITH QUICK RISES ON SMALLER
CREEKS IN THE AREA.
FLASH FLOODS OCCUR QUICKLY...MOVE TO HIGHER GROUND. AVOID WATER
COVERED ROADS...THE ROAD MAY BE WASHED OUT. LESS THAN ONE FOOT OF
FAST FLOWING WATER CAN SWEEP AN AUTOMOBILE OFF THE ROAD.
LAT...LON 4153 9378 4152 9337 4187 9336 4220 9324
4219 9363
KULA
$$000
WGUS73 KDMX 090349
FFSDMX
IAC153-169-090845-
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1049 PM CDT THU MAY 8 2003
...A FLASH FLOOD WARNING CONTINUES FOR STORY AND POLK COUNTIES UNTIL
245 AM...
AT 1040 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED ISOLATED
THUNDERSTORMS CONTAINING HEAVY RAINFALL FROM DES MOINES INTO WESTERN
AND SOUTHWESTERN IOWA. THE STORMS ARE MOVING NORTHEAST AT 45 MPH
TOWARD THE WARNED AREA. WIDESPREAD HEAVY RAINFALL IS NOT EXPECTED
AND EARLIER RAINS WERE NOT SUFFICIENT TO CAUSE WIDESPREAD FLASH
FLOODING. HOWEVER...ADDITIONAL LOCAL RAINFALL OF ONE HALF TO ONE
INCH IS POSSIBLE THROUGH MIDNIGHT SO THE FLASH FLOOD WARNING IS
CONTINUED. ADDITIONAL RAINS WILL PRODUCE LOCALIZED URBAN
FLOODING...WITH QUICK RISES ON SMALLER CREEKS IN THE AREA.
FLASH FLOODS OCCUR QUICKLY. 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 4153 9378 4152 9337 4187 9336 4220 9324
4219 9363
KULA
$$000
WGUS73 KDMX 090448
FFSDMX
IAC153-169-090845-
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1147 PM CDT THU MAY 8 2003
...A FLASH FLOOD WARNING CONTINUES FOR STORY AND POLK COUNTIES UNTIL
245 AM...
AT 1140 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED A NARROW
BAND OF THUNDERSTORMS WITH HEAVY RAINFALL FROM WEST DES MOINES TO
WEST OF WINTERSET. THE STORMS ARE MOVING NORTHEAST AT 45 MPH AND
SHOULD REACH A LINE FROM NEAR MARSHALLTOWN TO SOUTHEASTERN POLK
COUNTY BY 1245 AM. RAINFALL COULD REACH A HALF INCH IN LESS THAN 30
MINUTES...CAUSING STREET FLOODING AND SOME RISES IN SMALLER
STREAMS.
ONCE THE LINE OF STORMS PASSES THROUGH...THE THREAT FOR HEAVY RAIN
SHOULD BE DIMINISHED AND THE FLASH FLOOD WARNING WILL LIKELY BE
CANCELLED BY 100 AM.
FLASH FLOODS OCCUR QUICKLY. AVOID WATER COVERED ROADS...THE ROAD MAY
BE WASHED OUT. LESS THAN ONE FOOT OF FAST FLOWING WATER CAN SWEEP AN
AUTOMOBILE OFF THE ROAD.
LAT...LON 4153 9378 4152 9337 4187 9336 4220 9324
4219 9363
JUNGBLUTH
$$000
WGUS73 KDMX 090530
FFSDMX
IAC153-169-090545-
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DES MOINES IA
1230 AM CDT FRI MAY 9 2003
...THE FLASH FLOOD WARNING WHICH WAS IN EFFECT FOR STORY AND POLK
COUNTIES HAS BEEN CANCELLED...
THE LAST ROUND OF STORMS HAS MOVED OUT OF THE WARNED AREA...
PRODUCING AROUND ONE QUARTER OF AN INCH OF RAIN...THUS THE WARNING
HAS BEEN CANCELLED.
AT 1225 AM...THE BACK EDGE OF THE THUNDERSTORMS EXTENDED FROM
ZEARING TO 10 MILES NORTHEAST OF DES MOINES...OR FROM 45 MILES
NORTHEAST OF DES MOINES TO 10 MILES NORTHEAST OF DES MOINES...MOVING
NORTHEAST AT 55 MPH. NO ADDITIONAL DEVELOPMENT OF THUNDERSTORMS IS
EXPECTED TONIGHT AND STREAMS SHOULD REMAIN IN THEIR BANKS.
LAT...LON 4221 9369 4187 9371 4154 9380 4153 9336
4187 9335 4220 9326
JUNGBLUTH
$$The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 7:08 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 37 min |
| May 8, 7:30 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek | 30 min |
| May 8, 7:36 PM CDT | Severe Thunderstorm Warning | DMX | Polk, Warren | 34 min |
| May 8, 7:41 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall | 44 min |
| May 8, 7:44 PM CDT | Severe Thunderstorm Warning | DMX | Tama | 31 min |
| May 8, 7:50 PM CDT | Severe Thunderstorm Warning | DMX | Polk | 25 min |
| May 8, 8:07 PM CDT | Severe Thunderstorm Warning | DMX | Story | 23 min |
| May 8, 8:11 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 34 min |
| May 8, 8:32 PM CDT | Severe Thunderstorm Warning | DMX | Bremer | 28 min |
| May 8, 8:53 PM CDT | Severe Thunderstorm Warning | DMX | Taylor | 37 min |
| May 8, 9:11 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold | 34 min |
Nearby
Flash Flood Warnings in Iowa, 2003Every flash flood warning in 2003
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.