Alert archive / South Dakota / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 99, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 18, 1990, 4:36 AM CDT for Turner County, South Dakota. It was in force for 21 min.
The area
The counties it named.
The facts
- Issued
- Jul 18, 1990, 4:36 AM CDT (09:36 UTC)
- Expired
- Jul 18, 1990, 4:57 AM CDT
- In force
- 21 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Turner 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, 9.6 hours before the alert went out and 203 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
- 49 J/kg
- Mixed-layer CIN
- -404 J/kg
- Mixed-layer LCL
- 2664 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 83 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 KFSD 180937
SVRFSD
SDC083-125-181015-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
436 AM CDT WED JUL 18 1990
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 515 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTHEAST SOUTH DAKOTA
...NORTHWESTERN LINCOLN...NORTHEASTERN TURNER
SOME CITIES INCLUDED IN THIS WARNING ARE LENNOX...TEA AND CHANCELOR.
AT 434 AM RADAR INDICATED A SEVERE THUNDERSTORM 15 MILES SOUTHWEST OF
SIOUX FALLS MOVING TOWARDS THE EAST AT 15 MPH.
IF YOU ARE IN THE PATH OF THIS STORM...YOU SHOULD GET TO A
REINFORCED SHELTER. A SEVERE THUNDERSTORM PRODUC~ES WINDS IN EXCESS
OF 60 MPH...HAIL 3/4 INCH OR LARGER...DEADLY LIGHTNING...AND HEAVY
RAIN THAT CAN QUICKLY FLOOD A LOW LYING AREA.What forecasters said that day
The local office's own words before this severe thunderstorm 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 18, 2:35 AM CDT, 2 hours 1 minute before
SDZ0D17-020-180835- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 235 AM CDT WED JUL 18 1990 AT 230 AM CDT A STRONG THUNDERSTORM WITH HEAVY RAIN AND POSSIBLE SMALL HAIL WAS LOCATED 3 MILES SOUTH OF TRIPP SOUTH DAKOTA OR ABOUT 35 MILES NORTHWEST OF YANKTON. THE STORM WAS MOVING EAST AT 15 MPH. SOME TOWNS THAT MAY BE EFFECTED BY THIS STORM BETWEEN 230 AND 330 AM CDT ARE KAYLOR AND SCOTLAND. KOSCIELSKI
Special weather statement, Jul 18, 3:06 AM CDT, 1 hour 30 minutes before
SDZ017-020-
Special weather statement, Jul 18, 3:08 AM CDT, 1 hour 28 minutes before
SDZ017-018-020-180910- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 307 AM CDT WED JUL 18 1990 AT 3AM CDT THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDED FROM 30 MILES SOUTH OF MITCHELL TO 15 MILES NORTHWEST OF YANKTON SOUTH DAKOTA. STRONGEST THUNDERSTORMS WERE LOCATED 30 MILES NORTHWEST OF YANKTON NEAR TRIPP AND SCOTLAND. THESE STORMS MAY CONTAIN HAIL AND GUSTY WINDS. ANOTHER THUNDERSTORM WAS LOCATED 30 MILES SOUTHWEST OF MITCHELL OR JUST NORTH OF ARMOUR. MOVEMENT WAS EAST AT 10 MILES AN HOUR. SHEEHAN
Special weather statement, Jul 18, 4:11 AM CDT, 25 minutes before
SDZ017-018-020-181010- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 410 AM CDT WED JUL 18 1990 STRONG THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED 30 MILES NORTH OF YANKTON NEAR HCENTER POINT...MARION AND FREEMAN SOUTH DAKOTA. THESE THUNDERSTORMS CONTAIN VERY HEAVY RAIN AND FREQUENT LIGHTNING AND ARE CAPABLE OF PRODUCING GUSTY SURFACE WINDS AND SMALL HAIL. MOVEMENT WAS EAST AT 15 MILES AN HOUR. SHEEHAN
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 4:36 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 39 min |
| Jul 18, 5:16 AM CDT | Severe Thunderstorm Warning | FSD | Minnehaha | 29 min |
| Jul 18, 5:45 AM CDT | Severe Thunderstorm Warning | FSD | Minnehaha | 30 min |
| Jul 18, 10:17 AM CDT | Severe Thunderstorm Warning | FSD | Clay, Lincoln | 43 min |
| Jul 18, 10:20 AM CDT | Severe Thunderstorm Warning | FSD | Union | 40 min |
| Jul 18, 10:54 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 66 min |
| Jul 18, 11:28 AM CDT | Severe Thunderstorm Warning | FSD | McCook, Turner | 47 min |
| Jul 18, 11:42 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 33 min |
| Jul 18, 12:12 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 33 min |
| Jul 18, 4:34 PM CDT | Severe Thunderstorm Warning | FSD | Brookings | 41 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 1990Every severe thunderstorm 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.