Alert archive / Iowa / Flash Flood Warnings in 1994
Flash Flood Warning 1, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at May 22, 1994, 7:40 PM CDT for Calhoun County, Iowa. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- May 22, 1994, 7:40 PM CDT (00:40 UTC)
- Expired
- May 22, 1994, 10:45 PM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Calhoun County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.7 hours before the alert went out and 186 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
- 159 J/kg
- Mixed-layer CIN
- -147 J/kg
- Mixed-layer LCL
- 2414 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 230041 FFWDSM IAC025-230345- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 740 PM CDT SUN MAY 22 1994 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 1045 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN WEST CENTRAL IOWA ...NORTHERN CALHOUN COUNTY DOPPLER RADAR INDICATED THAT RAINFALL BETWEEN 3 AND 4 INCHES HAD FALLEN BETWEEN 6 AND 730 PM. THE THUNDERSTORM REMAINED OVER NORTHWEST CALHOUN COUNTY ABOUT 15 MILES NORTHWEST OF ROCKWELL CITY OR 35 MILES WEST OF FORT DODGE. THE THUNDERSTORM WAS STATIONARY A 730 PM AND SHOULD CONTINUE TO PRODUCE VERY HEAVY RAINFALL. 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. JOHNSON
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, May 22, 4:35 PM CDT, 3 hours 5 minutes before
IAZALL-222240- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IOWA 435 PM CDT SUN MAY 22 1994 AT 425 PM CDT...AN AREA OF THUNDERSTORMS HAD DEVELOPED FROM WEST CENTRAL INTO CENTRAL IOWA. THE STORMS WERE IN AN AREA 20 MILES WIDE FROM IDA GROVE...40 MILES EAST OF SIOUX CITY...TO STORY CITY...40 MILES NORTH OF DES MOINES. THE HEAVIEST RAIN WAS LOCATED BETWEEN LAKE VIEW AND LAKE CITY...30 MILES SOUTHWEST OF FORT DODGE. THESE STORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...SMALL HAIL... AND GUSTY WINDS. MOVEMENT OF THE PRECIPITATION COULD NOT BE DETERMINED DUE TO ITS RECENT DEVELOPMENT. BAILEY
Special weather statement, May 22, 6:05 PM CDT, 1 hour 35 minutes before
IAZALL-240000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IOWA 605 PM CDT SUN MAY 22 1994 ...LOCALLY HEAVY RAIN HAD FALLEN OVER WEST CENTRAL IOWA... AT 600 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A GROUP OF THUNDERSTORMS OVER WEST CENTRAL IOWA. THE STORMS WERE LOCATED BETWEEN FORT DODGE AND JEFFERSON...OR 60 MILES NORTHWEST OF DES MOINES. THE THUNDERSTORMS WERE MOVING SLOWLY SOUTHEAST AT 10 MPH. THUNDERSTORMS SHOULD CONTINUE BETWEEN FORT DODGE AND JEFFERSON AND MOVE INTO THE BOONE AND WEBSTER CITY AREAS BY 700 PM. ALTHOUGH THE THUNDERSTORMS ARE NOT EXPECTED TO BE SEVERE...LOCALLY HEAVY RAIN AND POSSIBLE SMALL HAIL CAN BE EXPECTED. DOPPLER RADAR INDICATED THAT BETWEEN AN INCH AND AN INCH AND ONE HALF OF RAIN HAS FALLEN OVER NORTHWEST GREEN COUNTY BETWEEN JEFFERSON AND LAKE CITY. THIS AMOUNT OF RAINFALL SHOULD PRODUCE STANDING WATER ON AREA ROADS. MOTORISTS ALONG HIGHWAYS 20...30 AND 169 IN BOONE AND FORT DODGE AREA SHOULD BE PREPARED FOR VERY HEAVY RAIN. YOU SHOULD REDUCE YOUR SPEED. REMEMBER...WET ROADS MAY BE SLICK DUE TO OIL ON THE ROAD SURFACES SINCE IT HAS BEEN DRY RECENTLY BEFORE THIS AFTERNOONS RAINFALL. JOHNSON
Special weather statement, May 22, 6:15 PM CDT, 1 hour 25 minutes before
IAZALL-240000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IOWA 605 PM CDT SUN MAY 22 1994 ...LOCALLY HEAVY RAIN HAD FALLEN OVER WEST CENTRAL IOWA... AT 600 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A GROUP OF THUNDERSTORMS OVER WEST CENTRAL IOWA. THE STORMS WERE LOCATED BETWEEN FORT DODGE AND JEFFERSON...OR 60 MILES NORTHWEST OF DES MOINES. THE THUNDERSTORMS WERE MOVING SLOWLY SOUTHEAST AT 10 MPH. THUNDERSTORMS SHOULD CONTINUE BETWEEN FORT DODGE AND JEFFERSON AND MOVE INTO THE BOONE AND WEBSTER CITY AREAS BY 700 PM. ALTHOUGH THE THUNDERSTORMS ARE NOT EXPECTED TO BE SEVERE...LOCALLY HEAVY RAIN AND POSSIBLE SMALL HAIL CAN BE EXPECTED. DOPPLER RADAR INDICATED THAT BETWEEN AN INCH AND AN INCH AND ONE HALF OF RAIN HAS FALLEN OVER NORTHWEST GREEN COUNTY BETWEEN JEFFERSON AND LAKE CITY. THIS AMOUNT OF RAINFALL SHOULD PRODUCE STANDING WATER ON AREA ROADS. MOTORISTS ALONG HIGHWAYS 20...30 AND 169 IN BOONE AND FORT DODGE AREA SHOULD BE PREPARED FOR VERY HEAVY RAIN. YOU SHOULD REDUCE YOUR SPEED. REMEMBER...WET ROADS MAY BE SLICK DUE TO OIL ON THE ROAD SURFACES SINCE IT HAS BEEN DRY RECENTLY BEFORE THIS AFTERNOONS RAINFALL. B JOHNSON
Special weather statement, May 22, 7:35 PM CDT, 5 minutes before
IAZALL-230140- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IOWA 735 PM CDT SUN MAY 22 1994 AT 725 PM CDT...AN AREA OF THUNDERSTORMS PRODUCING LOCALLY HEAVY RAIN CONTINUED FROM WEST CENTRAL THROUGH CENTRAL AND NORTH CENTRAL IOWA AND INTO EAST CENTRAL IOWA. THE STORMS WERE IN AN AREA 60 MILES WIDE FROM MANILLA...50 MILES NORTHEAST OF COUNCIL BLUFFS...TO JUST SOUTHWEST OF WATERLOO. THE STRONGEST OF THE STORMS WAS OVER THE TOWN OF MANNING...60 MILES NORTHEAST OF COUNCIL BLUFFS. THESE STORMS HAVE THE POTENTIAL TO PRODUCE LOCALLY HEAVY RAINFALL AND PEA SIZED HAIL. MOVEMENT OF THE PRECIPITATION WAS EAST AT 15 MILES AN HOUR. BAILEY
Nearby
Flash Flood Warnings in Iowa, 1994Every flash flood warning in 1994
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.