Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 103, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Aug 14, 1993, 12:41 PM CDT for Buena Vista County, Pocahontas County, Iowa. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Aug 14, 1993, 12:41 PM CDT (17:41 UTC)
- Expired
- Aug 14, 1993, 3:45 PM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Buena Vista County, IA, Pocahontas County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 5.7 hours before the alert went out and 198 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
- 1021 J/kg
- Mixed-layer CIN
- -204 J/kg
- Mixed-layer LCL
- 927 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 107 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 141742 FFWDSM IAC021-151-142045- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1241 PM CDT SAT AUG 14 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 345 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION(S)S... IN NORTHWEST IOWA ...SOUTHERN BUENA-VISTA COUNTY...SOUTHERN POCAHONTAS COUNTY AT 1235 PM CDT VERY HEAVY RAINS WERE OCCURRING OVER THE SOUTHERN HALF OF POCAHONTAS AND BUENA VISTA COUNTIES DUE TO SLOW-MOVING STORMS THAT WERE PRODUCING DOWNPOURS. SOME RIVERS AND CREEKS AFFECTED ARE LITTLE CEDAR CREEK...CEDAR CREEK ...OUTLET CREEK AND PRARIE CREEK AS WELL AS TRIBUTARIES OF THE NORTH RACCOON RIVER. 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. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT. IT'S IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS SHOULD AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS. FORSTER
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 14, 8:47 AM CDT, 3 hours 54 minutes before
IAZALL-141440- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 847 AM CDT SAT AUG 14 1993 AT 833 AM CDT...A SMALL AREA OF INTENSE THUNDERSTORMS WAS CENTERED ABOUT 25 MILES WEST OF DES MOINES NEAR EARLHAM. VERY HEAVY RAIN ...GUSTY WINDS...POSSIBLE SMALL HAIL AND FEQUENT DEADLY LIGHTNING CAN BE EXPECTED WITH THESE STORMS. THESE STORMS WERE PART OF A LARGER AREA OF SCATTERED SHOWERS AND THUNDERSTORMS WHICH CONTINUED ACROSS THE WESTERN HALF OF IOWA. COVERAGE WAS GREATEST ACROSS NORTHWEST IOWA. MOVEMENT WAS EAST AT 20 MILES AN HOUR. R A PRENTICE
Special weather statement, Aug 14, 9:49 AM CDT, 2 hours 52 minutes before
IAZALL-141540- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 949 AM CDT SAT AUG 14 1993 AT 926 AM CDT...TWO STRONG THUNDERSTORMS WERE LOCATED ACROSS CENTRAL IOWA. THE FIRST WAS CENTERED ABOUT 20 MILES WEST OF DES MOINES NEAR EARLHAM. THIS STORM WAS MOVING SLOWLY EAST AT 5 TO 10 MILES AN HOUR AND HAS BEEN PRODUCING LOCALLY HEAVY RAIN ACROSS NORTHWEST AND NORTH CENTRAL MADISON COUNTY...AS WELL AS SOUTHWEST AND SOUTH CENTRAL DALLAS COUNTY. THE SECOND STORM WAS LOCATED 25 MILES SOUTHWEST OF FORT DODGE OR 5 MILES SOUTH OF LOHRVILLE. THIS STORM WAS PRODUCING BRIEF VERY HEAVY RAIN...GUSTY WINDS AND POSSIBLY SOME SMALL HAIL. BOTH STORMS WERE PRODUCING FREQUENT DEADLY LIGHTNING. THESE STORMS WERE PART OF A LARGER AREA OF SCATTERED SHOWERS AND THUNDERSTORMS WHICH CONTINUED ACROSS THE WESTERN HALF OF IOWA. THIS AREA WAS LOCATED WEST OF A LINE EXTENDING FROM THE MINNESOTA BORDER 15 MILES NORTHWEST OF BANCROFT...TO 10 MILES EAST OF AMES...TO 15 MILES SOUTH OF DES MOINES. MOVEMENT WAS EAST AT 15 MILES AN HOUR. R A PRENTICE
Special weather statement, Aug 14, 10:49 AM CDT, 1 hour 52 minutes before
IAZALL-141640- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1049 AM CDT SAT AUG 14 1993 AT 1034 AM CDT...STRONG THUNDERSTORMS CONTINUED ACROSS NORTHWEST AND CENTRAL IOWA. THESE STORMS WERE LOCATED 5 MILES SOUTHEAST OF POCAHONTAS...5 MILES NORTH AND 10 MILES NORTHWEST OF ROCKWELL CITY...AND BETWEEN FORT DODGE AND BOONE. THESE STORMS WILL PRODUCE BREIF VERY HEAVY RAIN...GUSTY WINDS...POSSIBLE SMALL HAIL AND FREQUENT DEADLY LIGHTNING. THESE STORMS WERE PART OF A LARGER AREA OF NUMEROUS SHOWERS AND THUNDERSTORMS WHICH CONTINUED ACROSS NORTHWEST AND NORTH CENTRAL IOWA. THIS AREA WAS LOCATED WEST OF A LINE EXTENDING FROM THE MINNESOTA BORDER NORTH OF MASON CITY...TO 20 MILES NORTHEAST OF DES MOINES. MOVEMENT WAS EAST AT 25 MILES AN HOUR. R A PRENTICE
Special weather statement, Aug 14, 11:48 AM CDT, 53 minutes before
IAZALL-141740- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1148 AM CDT SAT AUG 14 1993 AT 1132 AM CDT...STRONG THUNDERSTORMS CONTINUED ACROSS NORTHWEST AND CENTRAL IOWA. THESE STORMS WERE LOCATED 10 MILES SOUTHWEST OF STORM LAKE...5 MILES NORTH AND 5 MILES WEST OF FORT DODGE...AND 5 MILES NORTH OF NEVADA. THESE STORMS ARE CAPABLE OF PRODUCING VERY HEAVY RAIN...GUSTY WINDS...SMALL HAIL AND FREQUENT DEADLY LIGHTNING. THESE STORMS WERE PART OF A LARGER AREA OF NUMEROUS SHOWERS AND THUNDERSTROMS WHICH CONTINUED ACROSS NORTHWEST AND NORTH CENTRAL IOWA. THIS AREA WAS LOCATED NORTH OF A LINE EXTENDING FROM THE NEBRASKA BORDER 30 MILES SOUTH OF SIOUX CITY...TO 15 MILES EAST OF AMES...TO 10 MILE WEST OF WATERLOO. MOVEMENT WAS EAST AT 25 MILES AN HOUR. R A PRENTICE
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 14, 11:36 AM CDT | Severe Thunderstorm Warning | DMX | Buena Vista, Pocahontas | 39 min |
| Aug 14, 12:21 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Pocahontas | 39 min |
| Aug 14, 1:59 PM CDT | Flash Flood Warning | DMX | Hardin | 2 hr |
| Aug 14, 5:06 PM CDT | Severe Thunderstorm Warning | DMX | Linn | 24 min |
| Aug 14, 5:17 PM CDT | Severe Thunderstorm Warning | DMX | Iowa | 28 min |
| Aug 14, 5:55 PM CDT | Severe Thunderstorm Warning | DMX | Marion | 35 min |
| Aug 14, 6:08 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 37 min |
| Aug 14, 6:21 PM CDT | Flash Flood Warning | DMX | Linn | 118 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.