Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 20, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jul 8, 1993, 11:41 PM CDT for Monona County, Iowa. It was in force for 119 min.
The area
The counties it named.
The facts
- Issued
- Jul 8, 1993, 11:41 PM CDT (04:41 UTC)
- Expired
- Jul 9, 1993, 1:40 AM CDT
- In force
- 119 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Monona County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.7 hours before the alert went out and 88 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
- 3257 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 692 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 244 m²/s²
- 0-3 km storm-relative helicity
- 341 m²/s²
- Significant tornado parameter
- 6.3
- Supercell composite
- 27.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSUX 090444 FFWSUX IAC133-090645- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SIOUX CITY IA 1141 PM CDT THU JUL 8 1993 THE NATIONAL WEATHER SERVICE IN SIOUX CITY HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 145 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN WEST CENTRAL IOWA ...EASTERN MONONA COUNTY AT 1140 PM CDT THE MONONA COUNTY SHERIFF REPORTED A BRIDGE WAS WASHED OUT ONE MILE NORTH OF UTE ALONG THE SOLDIER RIVER. FLASH FLOODING WILL LIKELY CONTINUE ALONG THE SOLDIER RIVER SOUTH OF UTE. VERY HEAVY RAINS HAVE FALLEN ACROSS THIS AREA TWICE TONIGHT AND WILL CONTINUE INTO EARLY FRIDAY MORNING. PERSONS LIVING IN THE WARNED AREA SHOULD SEEK HIGHER GROUND IMMEDIATELY. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. VEHICLES CAUGHT IN RISING WATERS SHOULD BE ABANDONED. DO NOT ATTEMPT TO CROSS BRIDGES OR LOW SPOTS IF WATER COVERS THEM. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. ACT QUICKLY. MOVE TO HIGHER GROUND TO ESCAPE RISING WATER. &
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, 8:51 PM CDT, 2 hours 50 minutes before
IAZ021-031-032-043-NEZ094-095-096-SDZ066-090245- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 848 PM CDT THU JUL 8 1993 ...STRONG THUNDERSTORMS IN SOUTHERN THURSTON COUNTY... AT 845 PM CDT STRONG THUNDERSTORMS WERE LOCATED 10 MILES EAST OF ROSALIE IN THURSTON COUNTY OR ABOUT 30 MILES SOUTH OF SIOUX CITY. HEAVY RAINS ARE POSSIBLE WITH THESE STORMS. THESE STORMS WERE MOVING TO THE EAST AT 30 MILES AN HOUR AND SHOULD BE NEAR ONAWA IN MONONA COUNTY ABOUT 915 PM. SINCE HEAVY RAINS ARE POSSIBLE...SOME FLOODING OF SMALL STREAMS AND RIVERS ARE POSSIBLE. THE GROUND IS ALREADY SATURATED IN THIS AREA DUE TO EARLIER HEAVY RAINS AND PEOPLE SHOULD BE ALERT TO THE POSSIBILITY OF FLASH FLOODING. THE SEVERE THUNDERSTORM WATCH IS STILL IN EFFECT FOR THE SOUTHERN SECTIONS OF THE SIOUXLAND AREA UNTIL MIDNIGHT. MICHELS
Special weather statement, Jul 8, 9:32 PM CDT, 2 hours 9 minutes before
IAZ021-031-032-043-NEZ094-095-096-090330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 932 PM CDT THU JUL 8 1993 ...THUNDERSTORMS EXPANDING IN COVERAGE... AT 925 PM CDT THUNDERSTORMS WERE INCREASING IN COVERAGE AND WERE LOCATED FIVE MILES EAST OF PENDER IN THURSTON COUNTY AND WESTERN MONONA COUNTY. PENDER IS ABOUT 30 MILES SOUTHWEST OF SIOUX CITY. WITH THESE THUNDERSTORMS HEAVY RAINS AND FREQUENT LIGHTNING ARE POSSIBLE. THESE STORMS WERE MOVING EAST AT 30 MILES AN HOUR. FLASH FLOODING IS POSSIBLE WITH THESE STORMS AS THEY ARE MOVING OVER GROUNDS THAT ARE PREVIOUSLY SATURATED WITH EARLIER RAINFALL. A FLASH FLOOD WATCH IS IN EFFECT UNTIL 3 AM FOR DAKOTA DIXON AND THURSTON COUNTIES IN NEBRASKA. A SEVERE THUNDERSTORM WATCH IS STILL IN EFFECT FOR THE SOUTHERN SECTIONS OF THE SIOUXLAND AREA UNTIL MIDNIGHT AND A TORNADO WATCH IS IN EFFECT FOR MONONA COUNTY IOWA UNTIL 4 AM. MICHELS
Special weather statement, Jul 8, 9:34 PM CDT, 2 hours 7 minutes before
IAZ021-031-032-043-NEZ094-095-096-090330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 932 PM CDT THU JUL 8 1993 ...THUNDERSTORMS EXPANDING IN COVERAGE... AT 925 PM CDT THUNDERSTORMS WERE INCREASING IN COVERAGE AND WERE LOCATED FIVE MILES EAST OF PENDER IN THURSTON COUNTY AND WESTERN MONONA COUNTY. PENDER IS ABOUT 30 MILES SOUTHWEST OF SIOUX CITY. WITH THESE THUNDERSTORMS HEAVY RAINS AND FREQUENT LIGHTNING ARE POSSIBLE. THESE STORMS WERE MOVING EAST AT 30 MILES AN HOUR. FLASH FLOODING IS POSSIBLE WITH THESE STORMS AS THEY ARE MOVING OVER GROUNDS THAT ARE PREVIOUSLY SATURATED WITH EARLIER RAINFALL. A FLASH FLOOD WATCH IS IN EFFECT UNTIL 3 AM FOR DAKOTA DIXON AN6D THURSTON COUNTIES IN NEBRASKA. A SEVERE THUNDERSTORM WATCH IS STILL IN EFFECT FOR THE SOUTHERN SECTIONS OF THE SIOUXLAND AREA UNTIL MIDNIGHT AND A TORNADO WATCH IS IN EFFECT FOR MONONA COUNTY IOWA UNTIL 4 AM. MICHELS
Special weather statement, Jul 8, 9:46 PM CDT, 1 hour 55 minutes before
SDZ017>020-090345- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 945 PM CDT THU JUL 8 1993 ...THUNDERSTORMS SPREADING NORTHEAST OVER SOUTHEAST SOUTH DAKOTA... AT 940 PM CDT THUNDERSTORMS WERE OCCURRING IN AN AREA EXTENDING FROM 35 MILES NORTHWEST OF SIOUX FALLS TO THE MISSOURI RIVER WEST OF YANKTON. THESE THUNDERSTORMS WERE MOVING NORTHEAST ABOUT 30 MPH AND SHOULD REACH THE SIOUX FALLS AREA AFTER 1030 PM AND INTO SOUTHWEST MIFNNESOTA AND NORTHWEST IOWA BY 1130 PM. THE THUNDERSTORMS ARE CAPABLE OF PRODUCING BRIEF HEAVY RAINS...GUSTY WINDS...SOME SMALL HAIL...AND FREQUENT LIGHTNING. RYRHOLM
Special weather statement, Jul 8, 10:37 PM CDT, 1 hour 4 minutes before
IAZ020-021-031-032-043-NEZ094-095-096-SDZ066-090445- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 1037 PM CDT THU JUL 8 1993 ...THUNDERSTORMS WITH HEAVY RAIN MOVING THROUGH THE AREA... AT 1035 PM CDT THUNDERSTORMS PRODUCING HEAVY RAIN EXTENDED FROM SIOUX CITY SOUTH TO WAKEFIELD AND PENDER NEBRASKA. WAKEFIELD IS 30 MILES SOUTHWEST OF SIOUX CITY. MOVEMENT WAS EAST AT 30 MILES AN HOUR. SOME FLOODING OF STREETS WILL BE POSSIBLE WITH THESE STORMS ALONG WITH THE CHANCE OF SOME STREAMS GOING OUT OF THEIR BANKS. PEOPLE SHOULD BE ALERT FOR THE POSSIBILITY OF SOME FLASH FLOODING. SEVERE THUNDERSTORMS WITH WINDS IN EXCESS OF 60 MILES AN HOUR WERE STILL WEST OF THE AREA. SOME OF THESE STORMS MAY MOVE INTO THURSTON COUNTY AROUND 11 PM. A TORNADO WATCH REMAINS IN EFFECT FOR MONONA COUNTY UNTIL 4 AM FRIDAY MORNING. A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THE SOUTHERN SECTIONS UNTIL MIDNIGHT AND A FLASH FLOOD WATCH IS IN EFFECT ALL NIGHT SOUTH OF SIOUX CITY. IRELAND
Special weather statement, Jul 8, 10:40 PM CDT, 1 hour 1 minute before
IAZ020-021-031-032-043-NEZ094-095-096-SDZ066-090445- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX CITY IA 1037 PM CDT THU JUL 8 1993 ...THUNDERSTORMS WITH HEAVY RAIN MOVING THROUGH THE AREA... AT 1035 PM CDT THUNDERSTORMS PRODUCING HEAVY RAIN EXTENDED FROM SIOUX CITY SOUTH TO WAKEFIELD AND PENDER NEBRASKA. WAKEFIELD IS 30 MILES SOUTHWEST OF SIOUX CITY. MOVEMENT WAS EAST AT 30 MILES AN HOUR. SOME FLOODING OF STREETS WILL BE POSSIBLE WITH THESE STORMS ALONG WITH THE CHANCE OF SOME STREAMS GOING OUT OF THEIR BANKS. PEOPLE SHOULD BE ALERT FOR THE POSSIBILITY OF SOME FLASH FLOODING. SEVERE THUNDERSTORMS WITH WINDS IN EXCESS OF 60 MILES AN HOUR WERE STILL WEST OF THE AREA. SOME OF THESE STORMS MAY MOVE INTO THURSTON COUNTY AROUND 11 PM. A TORNADO WATCH REMAINS IN EFFECT FOR MONONA COUNTY UNTIL 4 AM FRIDAY MORNING. A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THE SOUTHERN SECTIONS UNTIL MIDNIGHT AND A FLASH FLOO\D WATCH IS IN EFFECT ALL NIGHT SOUTH OF SIOUX CITY. IRELAND
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.