Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 67, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 11, 1993, 6:10 AM CDT for Polk County, Iowa. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Jul 11, 1993, 6:10 AM CDT (11:10 UTC)
- Expired
- Jul 11, 1993, 10:15 AM CDT
- In force
- 4 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Polk County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 11.2 hours before the alert went out and 236 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
- 3233 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 992 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 6.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 111110 FFWDSM IAC153-111515- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 610 AM CDT SUN JUL 11 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 1015 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)... IN CENTRAL IOWA ...SOUTHERN POLK COUNTY AT 6 AM...FOUR MILE CREEK IN DES MOINES WAS RISING RAPIDLY. FLOODING VERY SIMILAR TO TWO DAYS AGO WILL OCCUR AGAIN THIS MORNING. PERSONS AFFECTED BY FLOODING ALONG FOUR MILE CREEK SHOULD MOVE TO HIGHER GROUND NOW. FLOOD STAGE AT THE EASTON BRIDGE IS 12 FEET AND THE CREEK WAS PASSING THROUGH THAT HEIGHT. AN ESTIMATED CREST AROUND 15 FEET IS EXPECTED AROUND 8 AM THIS MORNING. 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. MYERS
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 11, 4:17 AM CDT, 1 hour 53 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-111015- SPECIAL WEATHER STATEMENT...REVISED FOR WORDING... NATIONAL WEATHER SERVICE WATERLOO IA 410 AM CDT SUN JUL 11 1993 ...HEAVY RAINS MAY CAUSE SOME STREET FLOODING SOUTH OF WATERLOO... THUNDERSTORMS WITH HEAVY RAINS WERE RUMBLING FROM 5 MILES SOUTHWEST OF TO 15 MILES SOUTHEAST OF WATERLOO. THESE STORMS ARE LIKELY PRODUCING FREQUENT DEADLY LIGHTNING...GUSTY WINDS OF 30 TO 40 MPH AND SMALL HAIL IN ADDITION TO THE HEAVY RAINS. OTHER STORMS WERE REFIRING ALONG I-35 FROM MASON CITY TO HAMPTON...HAMPTON IS 25 MILES SOUTH OF MASON CITY. THROUGH 5 AM THE STRONGEST STORMS ARE GOING TO AFFECT LAPORTE CITY... GILBERTVILLE...JESUP...INDEPENDENCE...ROWLEY AND WALKER WHILE OTHER LESS INTENSE STORMS AFFECT THE REST OF NORTHEAST IOWA. HEAVY RAINS MAY CONTRIBUTE TO SOME URBAN AND SMALL STREAM FLOODING SO MOTORISTS ARE ADVISED TO STAY ALERT FOR WATER-COVERED ROADS... ESPECIALLY IN THE AFOREMENTIONED COMMUNITIES. COLLAR
Special weather statement, Jul 11, 4:38 AM CDT, 1 hour 32 minutes before
IAZALL-110940- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 438 AM CDT SUN JUL 11 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR IOWA FOR TONIGHT... AT 427 AM CDT...A 15 MILE WIDE BAND OF STRONG THUNDERSTORMS WAS OVER CENTRAL IOWA. THE STORMS WERE CENTERED FROM 25 MILES EAST OF DES MOINES ...NEAR NEWTON TO 30 MILES SOUTH OF DES MOINES...NEAR LUCAS. THESE STORMS HAVE BEEN PRODUCING VERY HEAVY RAINS...GUSTY WINDS UP TO 40 MILES AN HOUR...FREQUENT DEADLY LIGHTNING AND POSSIBLY SMALL HAIL. THE STORMS WERE PART OF A LARGE AREA OF SCATTERED SHOWERS AND STORMS OCCURRING OVER THE EAST TWO THIRDS OF THE STATE. THE AREA OF SHOWERS AND STORMS WAS EAST OF A LINE FROM 35 MILES WEST OF MASON CITY TO 40 MILES WEST OF DES MOINES TO 30 MILES WEST OF LAMONI. THE SHOWERS AND STORMS WERE MOVING EAST AT AROUND 35 MILES AN HOUR. FILLBACH
Special weather statement, Jul 11, 4:42 AM CDT, 1 hour 28 minutes before
IAZALL-110940- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 438 AM CDT SUN JUL 11 1993 ...A FLASH FLOOD WATCH IS IN EFFECT FOR IOWA FOR TONIGHT... AT 427 AM CDT...A 15 MILE WIDE BAND OF STRONG THUNDERSTORMS WAS OVER CENTRAL IOWA. THE STORMS WERE CENTERED FROM 25 MILES EAST OF DES MOINES ...NEAR NEWTON TO 30 MILES SOUTH OF DES MOINES...NEAR LUCAS. THESE STORMS HAVE BEEN PRODUCING VERY HEAVY RAINS...GUSTY WINDS UP TO 40 MILES AN HOUR...FREQUENT DEADLY LIGHTNING AND POSSIBLY SMALL HAIL. THE STORMS WERE PART OF A LARGE AREA OF SCATTERED SHOWERS AND STORMS OCCURRING OVER THE EAST TWO THIRDS OF THE STATE. THE AREA OF SHOWERS AND STORMS WAS EAST OF A LI$NE FROM 35 MILES WEST OF MASON CITY TO 40 MILES WEST OF DES MOINES TO 30 MILES WEST OF LAMONI. THE SHOWERS AND STORMS WERE MOVING EAST AT AROUND 35 MILES AN HOUR. FILLBACH
Special weather statement, Jul 11, 5:10 AM CDT, 1 hour before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-111115- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 510 AM CDT SUN JUL 11 1993 ...THE RAINS TO END IN SOME AREAS BUT CONTINUE FOR MOST OF US... A LARGE AREA OF SHOWERS AND THUNDERSTORMS IS GOING TO PERSIST THROUGH 7 AM FOR MOST LOCATIONS BUT COME TO AN END IN THE I-35 AREA. THE STRONGEST STORMS WILL MOVE OUT OF THE WATERLOO/CEDAR FALLS AREA BY 530 AND AFFECT INDEPENDENCE...ANAMOSA AND MONTICELLO THROUGH 7 AM. WITH THE GROUND ALREADY SATURATED THE RAIN MAY RUNOFF CAUSING SOME URBAN AND SMALL STREAM FLOODING. IF YOU ENCOUNTER A ROADWAY WITH STANDING WATER DO NOT ATTEMPT TO DRIVE THROUGH IT. COLLAR ESPECIALLY IN THE AFOREMENTIONED COMMUNITIES. COLLAR
Special weather statement, Jul 11, 5:11 AM CDT, 59 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-111115- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 510 AM CDT SUN JUL 11 1993 ...THE RAINS TO END IN SOME AREAS BUT CONTINUE FOR MOST OF US... A LARGE AREA OF SHOWERS AND THUNDERSTORMS IS GOING TO PERSIST THROUGH 7 AM FOR MOST LOCATIONS BUT COME TO AN END IN THE I-35 AREA. THE STRONGEST STORMS WILL MOVE OUT OF THE WATERLOO/CEDAR FALLS AREA BY 530 AND AFFECT INDEPENDENCE...ANAMOSA AND MONTICELLO THROUGH 7 AM. WITH THE GROUND ALREADY SATURATED THE RAIN MAY RUNOFF CAUSING SOME URBAN AND SMALL STREAM FLOODING. IF YOU ENCOUNTER A ROADWAY WITH STANDING WATER DO NOT ATTEMPT TO DRIVE THROUGH IT. COLLAR ESPECIALLY IN THE AFOREMENTIONED COMMUNITIES. COLLAR
Special weather statement, Jul 11, 5:12 AM CDT, 58 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-111115- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 510 AM CDT SUN JUL 11 1993 ...THE RAINS TO END IN SOME AREAS BUT CONTINUE FOR MOST OF US... A LARGE AREA OF SHOWERS AND THUNDERSTORMS IS GOING TO PERSIST THROUGH 7 AM FOR MOST LOCATIONS BUT COME TO AN END IN THE I-35 AREA. THE STRONGEST STORMS WILL MOVE OUT OF THE WATERLOO/CEDAR FALLS AREA BY 530 AND AFFECT INDEPENDENCE...ANAMOSA AND MONTICELLO THROUGH 7 AM. WITH THE GROUND ALREADY SATURATED THE RAIN MAY RUNOFF CAUSING SOME URBAN AND SMALL STREAM FLOODING. IF YOU ENCOUNTER A ROADWAY WITH STANDING WATER DO NOT ATTEMPT TO DRIVE THROUGH IT. COLLAR
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 7:25 PM CDT | Severe Thunderstorm Warning | DMX | Mitchell | 37 min |
| Jul 10, 8:39 PM CDT | Flash Flood Warning | DMX | Appanoose | 2 hr |
| Jul 10, 8:39 PM CDT | Flash Flood Warning | DMX | Wayne | 102 min |
| Jul 10, 11:05 PM CDT | Severe Thunderstorm Warning | DMX | Lucas | 19 min |
| Jul 10, 11:36 PM CDT | Flash Flood Warning | DMX | Dickinson, Emmet | 3 hr |
| Jul 10, 11:56 PM CDT | Flash Flood Warning | DMX | Clay, Palo Alto | 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.