Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 55, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 8, 1993, 10:47 PM CDT for Black Hawk County, Iowa. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 8, 1993, 10:47 PM CDT (03:47 UTC)
- Expired
- Jul 9, 1993, 1:45 AM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Black Hawk County, IA
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 3.8 hours before the alert went out and 284 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
- 71 J/kg
- Mixed-layer CIN
- -123 J/kg
- Mixed-layer LCL
- 1318 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KALO 090347 FFWALO IAC013-090645- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE WATERLOO IA 1047 PM CDT THU JUL 8 1993 THE NATIONAL WEATHER SERVICE IN WATERLOO HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 145 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTHEAST IOWA ...BLACK HAWK COUNTY AT 1045 PM RADAR CONTINUED TO SHOW STRONG THUNDERSTORMS PRODUCING VERY HEAVY RAINFALL FROM GRUNDY CENTER...20 MILES WEST OF WATERLOO TO NEAR OELWEIN...20 MILES EAST OF WATERLOO. THESE STORMS HAVE DROPPED RAIN IN EXCESS OF 2 INCHES IN LESS THAN ONE HOUR. DRY RUN CREEK IS OUT OF ITS BANKS PLUS WATER HAS BEEN RUNNING OVER ROADS IN THE WATERLOO AREA MAKING SEVERAL ROADS IMPASSABLE. THE POTENTIAL FOR MORE FLOODING IS HIGH AND PEOPLE LIVING IN THE WATERLOO...HUDSON AND LAPORTE CITY AREAS SHOULD MOVE TO HIGHER GROUND QUICKLY AS FLASH FLOODING OCCURS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATERn COVERS THE ROADWAY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. COLLAR/PABST &
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, Jul 8, 9:43 PM CDT, 1 hour 4 minutes before
IAZALL-090345- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 943 PM CDT THU JUL 8 1993 ...A TORNADO WATCH IS IN EFFECT FOR MUCH OF SOUTHERN IOWA UNTIL 4 AM FRIDAY... ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PART OF THE NORTH HALF OF IOWA UNTIL MIDNIGHT... AT 930 PM CDT...A LINE OF VERY STRONG THUNDERSTORMS CONTINUED FROM WEST CENTRAL INTO NORTH CENTRAL IOWA. THE STORMS WERE IN A 20 MILE WIDE BAND EXTENDING FROM 50 MILES NORTHEAST OF COUNCIL BLUFFS NEAR AUDUBON...TO 45 MILES NORTH OF DES MOINES NEAR JEWELL. OTHER VERY STRONG STORMS WERE OCCURRING FROM 25 MILES SOUTHWEST TO 25 MILES NORTH OF WATERLOO...OR FROM NEAR GRUNDY CENTER TO NASHUA. THESE STORMS WERE PRODUCING TORRENTIAL RAINFALL...GUSTY WINDS AND HAIL. THE STORMS WERE PART OF AN AREA OF STORMS AND SHOWERS LOCATED GENERALLY NORTH OF A LINE FROM COUNCIL BLUFFS TO DUBUQUE. / THE STORMS AND SHOWERS WERE MOVING EAST AT AROUND 35 MILES AN HOUR. KALLMAN
Special weather statement, Jul 8, 9:44 PM CDT, 1 hour 3 minutes before
IAZALL-090345- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 943 PM CDT THU JUL 8 1993 ...A TORNADO WATCH IS IN EFFECT FOR MUCH OF SOUTHERN IOWA UNTIL 4 AM FRIDAY... ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PART OF THE NORTH HALF OF IOWA UNTIL MIDNIGHT... AT 930 PM CDT...A LINE OF VERY STRONG THUNDERSTORMS CONTINUED FROM WEST CENTRAL INTO NORTH CENTRAL IOWA. THE STORMS WERE IN A 20 MILE WIDE BAND EXTENDING FROM 50 MILES NORTHEAST OF COUNCIL BLUFFS NEAR AUDUBON...TO 45 MILES NORTH OF DES MOINES NEAR JEWELL. OTHER VERY STRONG STORMS WERE OCCURRING FROM 25 MILES SOUTHWEST TO 25 MILES NORTH OF WATERLOO...OR FROM NEAR GRUNDY CENTER TO NASHUA. THESE STORMS WERE PRODUCING TORRENTIAL RAINFALL...GUSTY WINDS AND HAIL. THE STORMS WERE PART OF AN AREA OF STORMS AND SHOWERS LOCATED GENERALLY NORTH OF A LINE FROM COUNCIL BLUFFS TO DUBUQUE. / THE STORMS AND SHOWERS WERE MOVING EAST AT AROUN*D 35 MILES AN HOUR. KALLMAN
Special weather statement, Jul 8, 10:10 PM CDT, 37 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-090415- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1010 PM CDT THU JUL 8 1993 ...STRONG THUNDERSTORMS TO MOVE ALONG THE HIGHWAY 20 AREA... AT 10 PM STRONG THUNDERSTORMS WERE OCCURRING FROM NEAR DECORAH TO THE WATERLOO/CEDAR FALLS AREA. THESE STORMS WERE MOVING EAST AT 35 MPH AND ARE GOING TO PRODUCE VERY HEAVY RAINFALL ALONG WITH WIND GUSTS TO NEAR 50 MPH. THE POTENTIAL FOR URBAN AND SMALL STREAM FLOODING IS QUITE HIGH WITH THESE STORMS AS A LARGE AMOUNT OF RAIN OCCURS IN A SMALL PERIOD OF TIME. PEOPLE LIVING NEAR SMALL STREAMS OR CREEKS ALONG HIGHWAY 20 FROM WATERLOO TO INDEPENDENCE SHOULD SEEK SAFE SHELTER FROM THESE STORMS AND MOVE TO HIGHER GROUNDS SHOULD WATER LEVELS RISE. PEOPLE IN THE TOWNS OF WATERLOO...JESUP...DENVER...OELWEIN AND INDEPENDENCE ARE IN THE PATH OF THESE STORMS AND SHOULD BE AFFECTED BY THESE STORMS THROUGH 11 PM. STAY TUNED TO NOAA WEATHER RADIO AND TV FOR LATER WEATHER STATEMENTS AS A SEVERE THUNDERSTORM WATCH REMAIN IN EFFECT UNTIL MIDNIGHT FOR MUCH OF NORTH CENTRAL AND NORTHEAST IOWA ALONG AND WEST OF HIGHWAY 63. RR/PC
Special weather statement, Jul 8, 10:12 PM CDT, 35 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-090415- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1010 PM CDT THU JUL 8 1993 ...STRONG THUNDERSTORMS TO MOVE ALONG THE HIGHWAY 20 AREA... AT 10 PM STRONG THUNDERSTORMS WERE OCCURRING FROM NEAR DECORAH TO THE WATERLOO/CEDAR FALLS AREA. THESE STORMS WERE MOVING EAST AT 35 MPH AND ARE GOING TO PRODUCE VERY HEAVY RAINFALL ALONG WITH WIND GUSTS TO NEAR 50 MPH. THE POTENTIAL FOR URBAN AND SMALL STREAM FLOODING IS QUITE HIGH WITH THESE STORMS AS A LARGE AMOUNT OF RAIN OCCURS IN A SMALL PERIOD OF TIME. PEOPLE LIVING NEAR SMALL STREAMS OR CREEKS ALONG HIGHWAY 20 FROM WATERLOO TO INDEPENDENCE SHOULD SEEK SAFE SHELTER FROM THESE STORMS AND MOVE TO HIGHER GROUNDS SHOULD WATER LEVELS RISE. PEOPLE IN THE TOWNS OF WATERLOO...JESUP...DENVER...OELWEIN AND INDEPENDENCE ARE IN THE PATH OF THESE STORMS AND SHOULD BE AFFECTED BY THESE STORMS THROUGH 11 PM. STAY TUNED TO NOAA WEATHER RADIO AND TV FOR LATER WEATHER STATEMENTS AS A SEVERE THUNDERSTORM WATCH REMAIN IN EFFECT UNTIL MIDNIGHT FOR MUCH OF NORTH CENTRAL AND NORTHEAST IOWA ALONG AND WEST OF HIGHWAY 63. RR/PC
Special weather statement, Jul 8, 10:40 PM CDT, 7 minutes before
IAZALL-090440- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1040 PM CDT THU JUL 8 1993 ...A TORNADO WATCH IS IN EFFECT FOR MUCH OF SOUTHERN IOWA UNTIL 4 AM FRIDAY... ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PART OF THE NORTH HALF OF IOWA UNTIL MIDNIGHT... AT 1026 PM CDT...ISOLATED VERY STRONG THUNDERSTORMS WERE OCCURRING OVER WEST CENTRAL...CENTRAL AND NORTHEAST IOWA. ONE AREA OF STORMS WAS LOCATED FROM 20 MILES WEST OF DES MOINES NEAR REDFIELD TO 15 MILES NORTH OF DES MOINES. OTHER STORMS WERE 45 MILES SOUTHEAST OF SIOUX CITY OR 10 MILES NORTH OF DENISON...AND 10 TO 30 MILES EAST OF WATERLOO. THESE STORMS WERE PRODUCING TORRENTIAL RAINFALL...WIND GUSTS OF 40 TO 45 MILES AN HOUR AND POSSIBLY HAIL. THE STORMS WERE PART OF AN AREA OF STORMS AND SHOWERS LOCATED NORTH OF A LINE FROM COUNCIL BLUFFS...TO DES MOINES...TO DUBUQUE. / THE STORMS AND SHOWERS WERE MOVING EAST AT 35 TO 40 MILES AN HOUR. KALLMAN
Special weather statement, Jul 8, 10:41 PM CDT, 6 minutes before
IAZALL-090440- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1040 PM CDT THU JUL 8 1993 ...A TORNADO WATCH IS IN EFFECT FOR MUCH OF SOUTHERN IOWA UNTIL 4 AM FRIDAY... ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PART OF THE NORTH HALF OF IOWA UNTIL MIDNIGHT... AT 1026 PM CDT...ISOLATED VERY STRONG THUNDERSTORMS WERE OCCURRING OVER WEST CENTRAL...CENTRAL AND NORTHEAST IOWA. ONE AREA OF STORMS WAS LOCATED FROM 20 MILES WEST OF DES MOINES NEAR REDFIELD TO 15 MILES NORTH OF DES MOINES. OTHER STORMS WERE 45 MILES SOUTHEAST OF SIOUX CITY OR 10 MILES NORTH OF DENISON...AND 10 TO 30 MILES EAST OF WATERLOO. THESE STORMS WERE PRODUCING TORRENTIAL RAINFALL...WIND GUSTS OF 40 TO 45 MILES AN HOUR AND POSSIBLY HAIL. THE STORMS WERE PART OF AN AREA OF STORMS AND SHOWERS LOCATED NORTH OF A LINE FROM COUNCIL BLUFFS...TO DES MOINES...TO DUBUQUE. / THE STORMS AND SHOWERS WERE MOVING EAST AT 35 TO 40p MILES AN HOUR. KALLMAN
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 7:12 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 43 min |
| Jul 8, 7:12 PM CDT | Severe Thunderstorm Warning | DMX | Carroll | 48 min |
| Jul 8, 8:05 PM CDT | Severe Thunderstorm Warning | DMX | Carroll, Greene, Guthrie | 55 min |
| Jul 8, 8:27 PM CDT | Flash Flood Warning | DMX | Carroll, Crawford, Greene | 4 hr |
| Jul 8, 8:57 PM CDT | Tornado Warning | DMX | Carroll, Crawford | 19 min |
| Jul 8, 9:09 PM CDT | Tornado Warning | DMX | Boone | 36 min |
| Jul 8, 9:29 PM CDT | Flash Flood Warning | DMX | Boone, Story | 4 hr |
| Jul 8, 9:29 PM CDT | Flash Flood Warning | DMX | Dallas, Guthrie | 4 hr |
| Jul 8, 9:31 PM CDT | Tornado Warning | DMX | Chickasaw | 29 min |
| Jul 8, 9:52 PM CDT | Tornado Warning | DMX | Boone, Dallas | 38 min |
| Jul 8, 10:03 PM CDT | Tornado Warning | DMX | Dallas, Polk | 27 min |
| Jul 8, 10:52 PM CDT | Severe Thunderstorm Warning | DMX | Buchanan | 20 min |
| Jul 8, 11:25 PM CDT | Flash Flood Warning | DMX | Jasper, Polk | 5 hr |
| Jul 8, 11:25 PM CDT | Flash Flood Warning | DMX | Marshall | 5 hr |
| Jul 8, 11:40 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll, Crawford | 35 min |
| Jul 8, 11:40 PM CDT | Severe Thunderstorm Warning | DMX | Adams, Cass, Taylor | 35 min |
| Jul 8, 11:49 PM CDT | Flash Flood Warning | DMX | Buchanan | 3 hr |
| Jul 9, 12:02 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Ringgold, Union | 28 min |
| Jul 9, 12:02 AM CDT | Severe Thunderstorm Warning | DMX | Greene, Guthrie | 28 min |
| Jul 9, 12:22 AM CDT | Flash Flood Warning | DMX | Carroll, Greene | 4 hr |
| Jul 9, 12:22 AM CDT | Flash Flood Warning | DMX | Audubon | 4 hr |
| Jul 9, 12:33 AM CDT | Severe Thunderstorm Warning | DMX | Dallas, Madison, Polk, Warren | 27 min |
| Jul 9, 12:33 AM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur | 27 min |
| Jul 9, 1:01 AM CDT | Flash Flood Warning | DMX | Black Hawk | 119 min |
| Jul 9, 1:05 AM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Lucas, Wayne | 25 min |
| Jul 9, 1:05 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marion, Polk | 25 min |
| Jul 9, 1:05 AM CDT | Severe Thunderstorm Warning | DMX | Warren | 25 min |
| Jul 9, 1:22 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 23 min |
| Jul 9, 1:36 AM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Poweshiek | 54 min |
| Jul 9, 1:36 AM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Monroe, Wapello | 54 min |
| Jul 9, 1:36 AM CDT | Severe Thunderstorm Warning | DMX | Jasper | 49 min |
| Jul 9, 2:11 AM CDT | Severe Thunderstorm Warning | DMX | Jefferson, Keokuk, Van Buren, Washington | 49 min |
| Jul 9, 2:11 AM CDT | Severe Thunderstorm Warning | DMX | Iowa, Johnson | 49 min |
| Jul 9, 10:21 AM CDT | Flash Flood Warning | DMX | Story | 6 hr |
Nearby
Flash Flood Warnings in Iowa, 1993Every flash flood warning in 1993
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.