Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 74, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 17, 1993, 2:00 PM CDT for Marshall County, Iowa. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Jul 17, 1993, 2:00 PM CDT (19:00 UTC)
- Expired
- Jul 17, 1993, 6:00 PM CDT
- In force
- 4 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Marshall County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 7.0 hours before the alert went out and 291 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
- 1223 J/kg
- Mixed-layer CIN
- -106 J/kg
- Mixed-layer LCL
- 1195 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 159 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 171900 FFWDSM IAC127-172300- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 200 PM CDT SAT JUL 17 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 600 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)... IN CENTRAL IOWA ...MARSHALL COUNTY AT 145 PM CDT OFFICIALS IN THE CITY OF MARSHALLTOWN REPORTED THAT LINN CREEK HAD RISEN SEVERAL FEET DURING THE PAST TWO HOURS UPSTREAM...OR WEST OF...MARSHALLTOWN. HEAVY RAINFALL OVER THE COUNTY THIS MORNING HAS RESULTED IN RAPID RISES IN ALL CREEKS AND STREAMS IN THE COUNTY. WATER LEVELS UPSTREAM OF MARSHALLTOWN WERE REPORTED TO BE AS HIGH OR HIGHER THAN THOSE OF LAST WEEKEND. PEOPLE IN THE NORTHEAST PART OF MARSHALLTOWN SHOULD BE ESPECIALLY CONCERNED AND KEEP WATCH AS THIS INCREASE IN WATER LEVEL COULD OVERTOP THE LEVEE BY LATER THIS AFTERNOON. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE< UP TO HIGHER GROUND.
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 17, 10:37 AM CDT, 3 hours 23 minutes before
IAZALL-171640- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1038 AM CDT SAT JUL 17 1993 AT 1025 AM CDT...WIDELY SCATTERED STRONG THUNDERSTORMS...PRODUCING EXTREMELY HEAVY RAIN...FREQUENT LIGHTNING AND POSSIBLE SMALL HAIL... CONTINUED OVER PARTS OF NORTHEAST INTO EAST CENTRAL IOWA. THESE STORMS WERE LOCATED IN A 25 MILE WIDE AREA...CENTERED FROM 15 MILES SOUTHEAST OF WATERLOO...TO 5 MILES SOUTHEAST OF CEDAR RAPIDS. THE THUNDERSTORMS WERE PART OF AN AREA OF SHOWERS AND STORMS COVERING MUCH OF THE NORTH HALF OF IOWA. THE STORMS AND SHOWERS WERE LOCATED GENERALLY NORTH OF A LINE FROM 25 MILES NORTH OF COUNCIL BLUFFS/OMAHA ...TO 50 MILES NORTH OF DES MOINES...NEAR JEWELL..TO 50 MILES EAST OF DES MOINES...NEAR GRINNEL...TO DAVENPORT/MOLINE. THE STORMS AND SHOWERS WERE MOVING NORTHEAST AT 20 MILES AN HOUR. WPM
Special weather statement, Jul 17, 10:38 AM CDT, 3 hours 22 minutes before
IAZALL-171640- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1038 AM CDT SAT JUL 17 1993 AT 1025 AM CDT...WIDELY SCATTERED STRONG THUNDERSTORMS...PRODUCING EXTREMELY HEAVY RAIN...FREQUENT LIGHTNING AND POSSIBLE SMALL HAIL... CONTINUED OVER PARTS OF NORTHEAST INTO EAST CENTRAL IOWA. THESE STORMS WERE LOCATED IN A 25 MILE WIDE AREA...CENTERED FROM 15 MILES SOUTHEAST OF WATERLOO...TO 5 MILES SOUTHEAST OF CEDAR RAPIDS. THE THUNDERSTORMS WERE PART OF AN AREA OF SHOWERS AND STORMS COVERING MUCH OF THE NORTH HALF OF IOWA. THE STORMS AND SHOWERS WERE LOCATED GENERALLY NORTH OF A LINE FROM 25 MILES NORTH OF COUNCIL BLUFFS/OMAHA ...TO 50 MILES NORTH OF DES MOINES...NEAR JEWELL..TO 50 MILES EAST OF DES MOINES...NEAR GRINNEL...TO DAVENPORT/MOLINE. THE STORMS AND SHOWERS WERE MOVING NORTHEAST AT 20 MILES AN HOUR. WPM
Special weather statement, Jul 17, 11:37 AM CDT, 2 hours 23 minutes before
IAZALL-171740- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1137 AM CDT SAT JUL 17 1993 AT 1126 AM CDT...WIDELY SCATTERED STRONG THUNDERSTORMS...PRODUCING EXTREMELY HEAVY RAIN...FREQUENT LIGHTNING AND POSSIBLE SMALL HAIL... CONTINUED OVER PARTS OF NORTHEAST INTO EAST CENTRAL IOWA. THESE STORMS WERE LOCATED IN A 40 MILE WIDE AREA...CENTERED FROM 15 MILES EAST OF WATERLOO...TO 10 MILES EAST OF CEDAR RAPIDS. THE THUNDERSTORMS WERE PART OF AN AREA OF SHOWERS AND STORMS COVERING MUCH OF THE NORTH HALF OF IOWA. THE STORMS AND SHOWERS WERE LOCATED GENERALLY NORTH OF A LINE FROM 25 MILES NORTH OF COUNCIL BLUFFS/OMAHA ...TO 70 MILES NORTH OF DES MOINES...NEAR IOWA FALLS...TO 25 MILES WEST OF CEDAR RAPIDS...TO DAVENPORT/MOLINE. THE STORMS AND SHOWERS WERE MOVING EAST AT 20 MILES AN HOUR. WPM
Special weather statement, Jul 17, 11:38 AM CDT, 2 hours 22 minutes before
IAZALL-171740- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1137 AM CDT SAT JUL 17 1993 AT 1126 AM CDT...WIDELY SCATTERED STRONG THUNDERSTORMS...PRODUCING EXTREMELY HEAVY RAIN...FREQUENT LIGHTNING AND POSSIBLE SMALL HAIL... CONTINUED OVER PARTS OF NORTHEAST INTO EAST CENTRAL IOWA. THESE STORMS WERE LOCATED IN A 40 MILE WIDE AREA...CENTERED FROM 15 MILES EAST OF WATERLOO...TO 10 MILES EAST OF CEDAR RAPIDS. THE THUNDERSTORMS WERE PART OF AN AREA OF SHOWERS AND STORMS COVERING MUCH OF THE NORTH HALF OF IOWA. THE STORMS AND SHOWERS WERE LOCATED GENERALLY NORTH OF A LINE FROM 25 MILES NORTH OF COUNCIL BLUFFS/OMAHA ...TO 70 MILES NORTH OF DES MOINES...NEAR IOWA FALLS...TO 25 MILES WEST OF CEDAR RAPIDS...TO DAVENPORT/MOLINE. THE STORMS AND SHOWERS WERE MOVING EAST AT 20 MILES AN HOUR. WPM
Special weather statement, Jul 17, 11:44 AM CDT, 2 hours 16 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-171845- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1144 AM CDT SAT JUL 17 1993 ...THE URBAN AND SMALL STREAM FLOOD ADVISORY HAS BEEN CANCELLED... AT 1140 AM...THE ROADS THAT REPORTED TO BE FLOODING IN NORTH CENTRAL AND NORTHEAST IOWA ARE NO LONGER FLOODING. RAIN HAS ENDED OR BECOME LIGHT OVER PORTIONS OF NORTH CENTRAL IOWA THAT WERE FLOODING. PERSONS LIVING IN NORTHEAST AND NORTH CENTRAL IOWA SHOULD STILL BE MONITORING THE WEATHER SITUATION AS THUNDERSTORMS WITH HEAVY RAIN ARE EXPECTED TO REDEVELOP AGAIN THIS AFTERNOON. WITH THE POTENTIAL FOR HEAVY RAINS AGAIN THIS AFTERNOON ON ALREADY SATURATED GROUNDS...FLASH FLOODING MAY AGAIN OCCUR. PLEASE STAY TUNED TO YOUR LOCAL MEDIA OR NOAA WEATHER RADIO FOR LATER UPDATES AND POSSIBLE WARNINGS. LINDENBERG
Special weather statement, Jul 17, 11:44 AM CDT, 2 hours 16 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-171845- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 1144 AM CDT SAT JUL 17 1993 ...THE URBAN AND SMALL STREAM FLOOD ADVISORY HAS BEEN CANCELLED... AT 1140 AM...THE ROADS THAT REPORTED TO BE FLOODING IN NORTH CENTRAL AND NORTHEAST IOWA ARE NO LONGER FLOODING. RAIN HAS ENDED OR BECOME LIGHT OVER PORTIONS OF NORTH CENTRAL IOWA THAT WERE FLOODING. PERSONS LIVING IN NORTHEAST AND NORTH CENTRAL IOWA SHOULD STILL BE MONITORING THE WEATHER SITUATION AS THUNDERSTORMS WITH HEAVY RAIN ARE EXPECTED TO REDEVELOP AGAIN THIS AFTERNOON. WITH THE POTENTIAL FOR HEAVY RAINS AGAIN THIS AFTERNOON ON ALREADY SATURATED GROUNDS...FLASH FLOODING MAY AGAIN OCCUR. PLEASE STAY TUNED TO YOUR LOCAL MEDIA OR NOAA WEATHER RADIO FOR LATER UPDATES AND POSSIBLE WARNINGS. LINDENBERG
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 5:44 AM CDT | Flash Flood Warning | DMX | Story | 3 hr |
| Jul 17, 6:35 AM CDT | Flash Flood Warning | DMX | Hardin, Marshall | 3 hr |
| Jul 17, 9:20 AM CDT | Flash Flood Warning | DMX | Polk | 3 hr |
| Jul 17, 3:42 PM CDT | Severe Thunderstorm Warning | DMX | Benton | 33 min |
| Jul 17, 5:00 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 30 min |
| Jul 17, 6:03 PM CDT | Flash Flood Warning | DMX | Buchanan | 3 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.