Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 124, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Aug 30, 1993, 1:52 AM CDT for Crawford County, Iowa. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Aug 30, 1993, 1:52 AM CDT (06:52 UTC)
- Expired
- Aug 30, 1993, 6:00 AM CDT
- In force
- 4 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Crawford County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 6.9 hours before the alert went out and 114 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
- 4054 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 760 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 172 m²/s²
- 0-3 km storm-relative helicity
- 263 m²/s²
- Significant tornado parameter
- 4.0
- Supercell composite
- 22.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 300653 FFWDSM IAC047-301100- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 152 AM CDT MON AUG 30 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 600 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)... IN WEST CENTRAL IOWA ...CRAWFORD COUNTY AT 150 AM...THUNDERSTORMS...PRODUCING VERY HEAVY RAINFALL...WERE OVER CRAWFORD COUNTY NORTH OF DENISON. MORE THUNDERSTORMS WEST INTO EASTERN NEBRASKA WILL LIKELY CROSS THIS SAME AREA PRODUCING EXCESSIVE RAINFALL. FLASH FLOODING IS LIKELY ALONG TRIBUTATIES OF THE SOLDIER RIVER AND THE BOYER RIVER. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...ACT QUICKLY. MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. 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, Aug 30, 12:11 AM CDT, 1 hour 41 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-300615- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1215 AM CDT MON AUG 30 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR NORTHEAST AND NORTH CENTRAL IOWA TONIGHT... SCATTERED LIGHT RAIN SHOULD CONTINUE ALONG THE HIGHWAY 20 CORRIDOR BETWEEN WATERLOO AND DUBUQUE. ANOTHER AREA OF SHOWERS AND THUNDERSTORMS WAS PUSHING INTO NORTH CENTRAL IOWA WITH THE LEADING EDGE ABOUT 25 MILES WEST OF MASON CITY. THIS SYSTEM HAS PRODUCED OVER 2 INCHES OF RAINFALL IN THE SIOUX CITY AREA EARLIER TONIGHT AND IS THE REASON FOR THE FLASH FLOOD WATCH OVERNIGHT IN NORTHEAST AND NORTH CENTRAL IOWA. HEAVY RAINS TONIGHT WILL MOST LIKLEY CAUSE FLOODING IN SOME STREAMS AND RIVERS ACROSS NORTHEAST AND NORTH CENTRAL IOWA. IF YOU LIVE IN FLOOD PRONE AREAS...KEEP AN EYE ON THE WEATHER AND BE PREPARED TO ACT QUICKLY IF FLOODING STARTS OR A WARNING IS ISSUED. LINDENBERG
Special weather statement, Aug 30, 12:15 AM CDT, 1 hour 37 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-300615- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1215 AM CDT MON AUG 30 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR NORTHEAST AND NORTH CENTRAL IOWA TONIGHT... SCATTERED LIGHT RAIN SHOULD CONTINUE ALONG THE HIGHWAY 20 CORRIDOR BETWEEN WATERLOO AND DUBUQUE. ANOTHER AREA OF SHOWERS AND THUNDERSTORMS WAS PUSHING INTO NORTH CENTRAL IOWA WITH THE LEADING EDGE ABOUT 25 MILES WEST OF MASON CITY. THIS SYSTEM HAS PRODUCED OVER 2 INCHES OF RAINFALL IN THE SIOUX CITY AREA EARLIER TONIGHT AND IS THE REASON FOR THE FLASH FLOOD WATCH OVERNIGHT IN NORTHEAST AND NORTH CENTRAL IOWA. HEAVY RAINS TONIGHT WILL MOST LIKLEY CAUSE FLOODING IN SOME STREAMS AND RIVERS ACROSS NORTHEAST AND NORTH CENTRAL IOWA. IF YOU LIVE IN FLOOD PRONE AREAS...KEEP AN EYE ON THE WEATHER AND BE PREPARED TO ACT QUICKLY IF FLOODING STARTS OR A WARNING IS ISSUED. LINDENBERG
Special weather statement, Aug 30, 12:40 AM CDT, 1 hour 12 minutes before
IAZALL-300640- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1240 AM CDT MON AUG 30 1993 ...A FLASH FLOOD WATCH CONTINUES FOR THE NORTHWEST TWO THIRDS OF IOWA TONIGHT... AT 1230 AM CDT...A LINE OF INTENSE THUNDERSTORMS WAS LOCATED IN WEST CENTRAL THROUGH NORTHWEST INTO NORTHCENTRAL IOWA. THIS LINE OF THUNDERSTORMS EXTENDED FROM ONAWA...20 MILES SOUTH OF SIOUX CITY...THROUGH IDA GROVE TO BUFFALO CENTER...ABOUT 35 MILES NORTHWEST OF MASON CITY. THE HEAVIEST STORM WAS LOCATED JUST SOUTH OF IDAGROVE. THESE STORM WILL PRODUCE EXTREMELY HEAVY RAIN...WIND GUSTS OF 40 TO 50 MILES AN HOUR...NEARLY CONTINUOUS DEADLY LIGHTNING AND POSSIBLY HAIL. THIS LINE OF STORMS WAS PART OF A MUCH LARGER AREA OF SHOWERS AND SCATTERED STRONG THUNDERSTORMS LOCATED OVER THE NORTHWEST THIRD OF IOWA. MOST OF THESE STORMS WERE ALONG AND NORTHWEST OF A LINE FROM 25 MILES NORTH OF OMAHA TO FORT DODGE AND EAST TO DUBUQUE. NORTHWEST OF MASON CITY. THE SHOWERS AND STORMS WERE MOVING EAST AT 25 MILES AN HOUR. SCOTT
Special weather statement, Aug 30, 1:19 AM CDT, 33 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-300715- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 119 AM CDT MON AUG 30 1993 ...A FLASH FLOOD WATCH REMAINS IN EFFECT FOR NORTHEAST AND NORTH CENTRAL IOWA OVERNIGHT... AT 115 AM...RADAR WAS SHOWING SHOWERS AND THUNDERSTORMS PRODUCING VERY HEAVY RAINS FROM 30 MILES NORTH OF WATERLOO...TO 25 MILES NORTHEAST OF WATERLOO. THESE STORMS ARE GOING TO DUMP HEAVY RAINS IN THE TOWNS OF NEW HAMPTON...WEST UNION...CALMAR...AND DECORAH. THESE RAINS ARE GOING TO CAUSE MINOR STREET FLOODING AND CAN CAUSE SMALL CREEKS AND STREAMS TO RISE RAPIDLY. REMEMBER...A FLASH FLOOD WATCH IS IN EFFECT FOR THIS AREA. CONDITIONS ARE FAVORABLE FOR FLASH FLOODING TONIGHT. DO NOT ATTEMPT TO DRIVE ACROSS WATER COVERING THE ROAD. STAY AWAY FROM CREEKS AND STREAMS. STAY TUNED TO YOUR NOAA WEATHER RADIO...OR LOCAL MEDIA FOR FURTHER UPDATES AND POSSIBLE WARNINGS. LINDENBERG
Special weather statement, Aug 30, 1:20 AM CDT, 32 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-300715- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 119 AM CDT MON AUG 30 1993 ...A FLASH FLOOD WATCH REMAINS IN EFFECT FOR NORTHEAST AND NORTH CENTRAL IOWA OVERNIGHT... AT 115 AM...RADAR WAS SHOWING SHOWERS AND THUNDERSTORMS PRODUCING VERY HEAVY RAINS FROM 30 MILES NORTH OF WATERLOO...TO 25 MILES NORTHEAST OF WATERLOO. THESE STORMS ARE GOING TO DUMP HEAVY RAINS IN THE TOWNS OF NEW HAMPTON...WEST UNION...CALMAR...AND DECORAH. THESE RAINS ARE GOING TO CAUSE MINOR STREET FLOODING AND CAN CAUSE SMALL CREEKS AND STREAMS TO RISE RAPIDLY. REMEMBER...A FLASH FLOOD WATCH IS IN EFFECT FOR THIS AREA. CONDITIONS ARE FAVORABLE FOR FLASH FLOODING TONIGHT. DO NOT ATTEMPT TO DRIVE ACROSS WATER COVERING THE ROAD. STAY AWAY FROM CREEKS AND STREAMS. STAY TUNED TO YOUR NOAA WEATHER RADIO...OR LOCAL MEDIA FOR FURTHER UPDATES AND POSSIBLE WARNINGS.` LINDENBERG
Special weather statement, Aug 30, 1:50 AM CDT, 2 minutes before
IAZALL-300740- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1 40 AM CDT MON AUG 30 1993 ...A FLASH FLOOD WATCH CONTINUES FOR THE NORTHWEST TWO THIRDS OF IOWA TONIGHT... AT 1 30 AM CDT...AN AREA OF INTENSE THUNDERSTORMS WAS LOCATED IN WEST CENTRAL IOWA BETWEEN ONAWA AND CARROLL...AND IN NORTH CENTRAL IOWA NEAR BUFFALO CENTER. THESE STORMS WILL PRODUCE EXTREMELY HEAVY RAIN...NEARLY CONTINUOUS LIGHTNING AND POSSIBLY HAIL. THESE STORMS WERE PART OF A MUCH LARGER AREA OF SHOWERS AND SCATTERED STRONG THUNDERSTORMS LOCATED OVER THE NORTHWEST THIRD OF IOWA. MOST OF THESE STORMS WERE ALONG AND NORTHWEST OF A LINE FROM 25 MILES NORTH OF OMAHA TO GUTTENBERG ...25 MILES NORTHWEST OF DUBUQUE. THE SHOWERS AND STORMS WERE MOVING EAST AT 25 MILES AN HOUR. SCOTT
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 1:29 AM CDT | Flash Flood Warning | DMX | Kossuth | 4 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.