Alert archive / South Dakota / Flash Flood Warnings in 1990
Flash Flood Warning 1, NWS Aberdeen, SD
NWS Aberdeen, SD issued this flash flood warning at Aug 1, 1990, 7:06 PM CDT for Lyman County, South Dakota. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Aug 1, 1990, 7:06 PM CDT (00:06 UTC)
- Expired
- Aug 1, 1990, 11:15 PM CDT
- In force
- 4 hr
- Issued by
- NWS Aberdeen, SD
- Area
- Whole counties
County Lyman County, SD
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Aberdeen, SD (KHON), launched 00:00Z, 0.1 hours before the alert went out and 160 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
- 94 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 2165 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 135 m²/s²
- 0-3 km storm-relative helicity
- 361 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 KHON 020006
FFWHON
SDC085-020415-
BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HURON SD
706 PM CDT WED AUG 1 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 1115 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY
IN THE CENTRAL PART OF SOUTH DAKOTA
NORTHEAST LYMAN
SOME OF THE CITIES INCLUDED IN THIS WARNING ARE LOWER BRULE AND
KENNEBEC.
AT 700 PM CDT...RADAR INDICATED A STATIONARY THUNDERSTORMS WITH
VERY HEAVY RAIN 10 MILES WEST OF LOWER BRULE OR 40 MILES SOUTHEAST
OF PIERRE.
A FLASH FLOOD WARNING MEANS FLASH FLOODING IS OCCURING OR IS
IMMINENT. ACT QUICKLY TO SAVE YOURSELF. GET OUT OF LOWLAND AREAS
SUBJECT TO FLOODING. AVOID ALREADY FLOODED AREAS. DO NOT ATTEMPT TO
FORD INUNDATED ROADS. WHEN YOU ARE OUT OF IMMEDIATE DANGER TUNE IN
AREA RADIO AND TELEVISION STATIONS FOR ADDITIONAL INFORMATION.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 1, 6:11 PM CDT, 55 minutes before
SDZNNN-DDHHMM- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ABERDEEN SD 610 PM CDT WED AUG 1 1990 ...SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTH CENTRAL SOUTH DAKOTA UNTILL 11 PM CDT... AT 6 PM CDT SKIES WERE MOSTLY SUNNY OVER THE GLACIAL LAKES REGION AND CLOUDY ELSEWHERE. SOME SPOTTY SHOWERS CONTINUE OVER THE UPPER JAMES RIVER VALLEY. DURING THE EVENING HOURS THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER MOST OF NORTHERN SOUTH DAKOTA WITH SOME IN THE WATCH AREA BECOMING SEVERE. TEMPERATURES WILL DROP SLOWLY INTO THE LOWER 80S FROM THE JAMES RIVER WESTWARD BY SUNSET AND IN THE LOWER 70S IN THE NORTHEAST. LAKE WIND ADVISORY REMAINS IN EFFECT FRO THE JAMES RIVER AND GLACIAL ALAKES REGION UNTILL SUNSET. STUDNICKA << < < < < < < < < < < < < < < < < < < < < < <
Special weather statement, Aug 1, 7:02 PM CDT, 4 minutes before
SDZ002-003-004-005-011-020100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ABERDEEN SD 702 PM CDT WED AUG 1 1990 ...SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTH CENTRAL SOUTH DAKOTA UNTILL 11 PM CDT... AT 7 PM CDT SKIES WERE MOSTLY CLOUDY TO CLOUDY ACROSS ALL OF NORTHERN SOUTH DAKOTA. SOME SHOWERS AND THUNDERSHOWERS HAVE DEVELOPED OVER THE FAR NORTHWEST PORTIONS IN AND AROUND THE LEMMON AREA. DURING THE EVENING HOURS THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER MOST OF NORTHERN SOUTH DAKOTA WITH SOME IN THE WATCH AREA BECOMING SEVERE. TEMPERATURES WILL DROP SLOWLY INTO THE LOWER 80S FROM THE JAMES RIVER WESTWARD BY SUNSET AND IN THE LOWER 70S IN THE NORTHEAST. LAKE WIND ADVISORY REMAINS IN EFFECT FROM THE JAMES RIVER AND GLACIAL LAKES REGION UNTIL SUNSET. STUDNICKA < < < < < < < < < < < < < < < < < < < < <
Nearby
Flash Flood Warnings in South Dakota, 1990Every flash flood warning in 1990
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.