Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 50, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 8, 1993, 6:33 AM CDT for Sac County, Iowa. It was in force for 117 min.
The area
The counties it named.
The facts
- Issued
- Jul 8, 1993, 6:33 AM CDT (11:33 UTC)
- Expired
- Jul 8, 1993, 8:30 AM CDT
- In force
- 117 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Sac County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 11.6 hours before the alert went out and 158 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
- 303 J/kg
- Mixed-layer CIN
- -240 J/kg
- Mixed-layer LCL
- 1249 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 101 m²/s²
- 0-3 km storm-relative helicity
- 194 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 081133 FFWDSM IAC161-081330- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 633 AM CDT THU JUL 8 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 830 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)... IN WEST CENTRAL IOWA ...SAC COUNTY AT 630 AM CDT...THUNDERSTORMS OVER EARLY IN SAC COUNTY...50 MILES WEST OF FORT DODGE...PRODUCED AROUND 2 INCHES OF RAIN IN 20 MINUTES. THIS SHOULD CAUSE FLASH FLOODING IN SAC COUNTY DURING THE NEXT FEW HOURS. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGERS...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 8, 4:41 AM CDT, 1 hour 52 minutes before
IAZALL-081040- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 441 AM CDT THU JUL 8 1993 ...A FLASH FLOOD WATCH CONTINUES FOR SOUTHWEST IOWA UNTIL 11 AM CDT... AT 427 AM CDT...A VERY STRONG THUNDERSTORM WAS OVER NORTHWEST IOWA. THIS STORM WAS LOCATED 35 MILES SOUTHEAST OF SIOUX CITY IN MONONA COUNTY. THIS STORM HAS BEEN PRODUCING VERY HEAVY RAINS...FREQUENT DANGEROUS LIGHTNING AND SMALL HAIL. THIS STORM WAS PART OF A LARGER AREA OF SHOWERS AND STORMS OVER PARTS OF WEST CENTRAL AND NORTHWEST IOWA. THE PRECIPITATION WAS WEST OF A LINE THAT EXTENDED FROM NEAR SPENCER SOUTH 40 MILES NORTHEAST OF COUNCIL BLUFFS...NEAR EXIRA. THE SHOWERS AND STORMS WERE MOVING NORTHEAST AT AROUND 40 MILES AN HOUR. FILLBACH
Special weather statement, Jul 8, 4:44 AM CDT, 1 hour 49 minutes before
IAZALL-081040- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 441 AM CDT THU JUL 8 1993 ...A FLASH FLOOD WATCH CONTINUES FOR SOUTHWEST IOWA UNTIL 11 AM CDT... AT 427 AM CDT...A VERY STRONG THUNDERSTORM WAS OVER NORTHWEST IOWA. THIS STORM WAS LOCATED 35 MILES SOUTHEAST OF SIOUX CITY IN MONONA COUNTY. THIS STORM HAS BEEN PRODUCING VERY HEAVY RAINS...FREQUENT DANGEROUS LIGHTNING AND SMALL HAIL. THIS STORM WAS PART OF A LARGER AREA OF SHOWERS AND STORMS OVER PARTS OF WEST CENTRAL AND NORTHWEST IOWA. THE PRECIPITATION WAS WEST OF A LINE THAT EXTENDED FROM NEAR SPENCER SOUTH 40 MILES NORTHEAST OF COUNCIL BLUFFS...NEAR EXIRA. THE SHOWERS AND STORMS WEREB MOVING NORTHEAST AT AROUND 40 MILES AN HOUR. FILLBACH
Special weather statement, Jul 8, 5:50 AM CDT, 43 minutes before
IAZALL-081145- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 550 AM CDT THU JUL 8 1993 ...A FLASH FLOOD WATCH CONTINUES FOR SOUTHWEST IOWA UNTIL 11 AM CDT... AT 525 AM CDT...A VERY STRONG THUNDERSTORM WAS 30 MILES NORTHEAST OF OMAHA NEAR HARLAN. ANOTHER STORM WITH HEAVY RAIN WAS 30 MILES EAST- SOUTHEAST OF SIOUX CITY JUST SOUTH OF IDA GROVE. BRIEF TORRENTIAL RAIN ...DANGEROUS LIGHTNING...STRONG WIND GUSTS AND SMALL HAIL CAN BE EXPECTED WITH THESE STRONG STORMS. THESE STORMS WERE PART OF A LARGER AREA OF NUMEROUS SHOWERS AND THUNDERSTORMS IN WESTERN IOWA. THE AREA WAS 100 MILES WIDE AND WEST OF A LINE FROM 40 MILES WEST MASON CITY NEAR ALGONA TO 50 MILES NORTHWEST LAMONI NEAR CORNING. MOVEMENT WAS NORTHEAST AT 40 MILES AN HOUR. / BURKE
Special weather statement, Jul 8, 5:52 AM CDT, 41 minutes before
IAZALL-081145- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 550 AM CDT THU JUL 8 1993 ...A FLASH FLOOD WATCH CONTINUES FOR SOUTHWEST IOWA UNTIL 11 AM CDT... AT 525 AM CDT...A VERY STRONG THUNDERSTORM WAS 30 MILES NORTHEAST OF OMAHA NEAR HARLAN. ANOTHER STORM WITH HEAVY RAIN WAS 30 MILES EAST- SOUTHEAST OF SIOUX CITY JUST SOUTH OF IDA GROVE. BRIEF TORRENTIAL RAIN ...DANGEROUS LIGHTNING...STRONG WIND GUSTS AND SMALL HAIL CAN BE EXPECTED WITH THESE STRONG STORMS. THESE STORMS WERE PART OF A LARGER AREA OF NUMEROUS SHOWERS AND THUNDERSTORMS IN WESTERN IOWA. THE AREA WAS 100 MILES WIDE AND WEST OF A LINE FROM 40 MILES WEST MASON CITY NEAR ALGONA TO 50 MILES NORTHWEST LAMONI NEAR CORNING. MOVEMENT WAS NORTHEAST AT 40 MILES AN HOUR. / BURKE
Special weather statement, Jul 8, 6:20 AM CDT, 13 minutes before
IAZALL-081245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 620 AM CDT THU JUL 8 1993 ...A LINE OF STORMS WITH HEAVY RAIN WILL MOVE THROUGH DES MOINES SOON... THUNDERSTORMS WILL ROAR THROUGH WEST DES MOINES AROUND 7 AM AND ACROSS THE DES MOINES METROPLEX BETWEEN 7 AND 9 AM. LOCAL STREET FLOODING IS LIKELY DUE TO BRIEF TORRENTIAL RAIN. FREQUENT DANGEROUS LIGHTNING... SMALL HAIL...AND WIND GUSTS TO 45 MILES AN HOUR WILL ACCOMPANY THE STRONGEST STORMS. IF YOU ARE THREATENED BY A STRONG DOWNBURST...TAKE COVER AND USE CAUTION IF YOU WILL BE OUT THIS MORNING. NEVER DRIVE INTO FLOWING WATER. THE SAFEST PLACE DURING A STRONG THUNDERSTORM IS INSIDE A STURDY SHELTER. BURKE
Special weather statement, Jul 8, 6:23 AM CDT, 10 minutes before
IAZALL-081245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 620 AM CDT THU JUL 8 1993 ...A LINE OF STORMS WITH HEAVY RAIN WILL MOVE THROUGH DES MOINES SOON... THUNDERSTORMS WILL ROAR THROUGH WEST DES MOINES AROUND 7 AM AND ACROSS THE DES MOINES METROPLEX BETWEEN 7 AND 9 AM. LOCAL STREET FLOODING IS LIKELY DUE TO BRIEF TORRENTIAL RAIN. FREQUENT DANGEROUS LIGHTNING... SMALL HAIL...AND WIND GUSTS TO 45 MILES AN HOUR WILL ACCOMPANY THE STRONGEST STORMS. IF YOU ARE THREATENED BY A STRONG DOWNBURST...TAKE COVER AND USE CAUTION IF YOU WILL BE OUT THIS MORNING. NEVER DRIVE INTO FLOWING WATER. THE SAFEST PLACE DURING A STRONG THUNDERSTORM IS INSIDE A STURDY SHELTER. BU>RKE
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 7:54 AM CDT | Flash Flood Warning | DMX | Dallas | 66 min |
| Jul 8, 6:19 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 41 min |
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.