Alert archive / South Dakota / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 108, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 18, 1990, 10:20 AM CDT for Union County, South Dakota. It was in force for 40 min.
The area
The counties it named.
The facts
- Issued
- Jul 18, 1990, 10:20 AM CDT (15:20 UTC)
- Expired
- Jul 18, 1990, 11:00 AM CDT
- In force
- 40 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Union 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
Omaha, NE (KOAX), launched 12:00Z, 3.3 hours before the alert went out and 170 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3632 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 138 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 KSUX 181520
SVRSUX
SDC127-181600-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX CITY IA
1020 AM CDT WED JUL 18 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 1100 AM CDT FOR PEOPLE IN THE FOLLOWING
COUNTY
IN THE SOUTHEAST PART OF SOUTH DAKOTA
NORTHWEST UNION
AT 1019 AM CDT RADAR SHOWED A SEVERE THUNDERSTORM 5 MILES SOUTH OF
BERESFORD SOUTH DAKOTA. THE STORM WAS MOVING EAST AT 25 MPH.
ALCESTER AND NORA ARE IN THE PATH OF THIS STORM.
REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS IN EXCESS
OF 60 MPH...LARGE HAIL...DEADLY LIGHTNING...AND HEAVY RAINS THAT CAN
QUICKLY FLOOD LOW LYI2NG AREAS. IF YOU ARE IN THE PATH OF THIS STORM
TAKE SHELTER IN A REINFORCED BUILDING IMMEDIATELY.
ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORTS
OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE.
HOPPESWhat 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, 5:06 AM CDT, 5 hours 14 minutes before
SDZ018-020-181110- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 506 AM CDT WED JUL 18 1990 STRONG THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED FROM 10 MILES SOUTH OF SIOUX FALLS TO 30 MILES SOUTH OF SIOUX FALLS NEAR BERESFORD. ANOTHER STRONG THUNDERSTORM WAS LOCATED 15 MILES SOUTHWEST OF SIOUX FALLS. THESE THUNDERSTORMS CONTAIN VERY HEAVY RAIN AND FREQUENT LIGHTNING AND ARE CAPABLE OF PRODUCING GUSTY SURFACE WINDS AND HAIL. MOVEMENT WAS EAST AT 20 MILES AN HOUR. SHEEHAN
Special weather statement, Jul 18, 6:10 AM CDT, 4 hours 10 minutes before
SDZ018-IAZ001-181210- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 610 AM CDT WED JUL 18 1990 AT 6AM CDT THUNDERSTORMS WITH VERY HEAVY RAIN HAD MOVED INTO NORTHWEST IOWA. THUNDERSTORMS EXTENDED FROM 10 MILES SOUTHEAST OF SIOUX FALLS TO 45 MILES SOUTHEAST OF SIOUX FALLS NEAR SIOUX CENTER IOWA. THESE THUNDERSTORMS CONTAIN VERY HEAVY RAIN AND FREQUENT LIGHTNING AND ARE CAPABLE OF PRODUCING GUSTY SURFACE WINDS AND HAIL. PEOPLE IN NORTHWEST IOWA SHOULD KEEP ON THE ALERT AND BE PREPARED TO SEEK SHELTER IF THREATNING WEATHER APPROACHES. MOVEMENT WAS EAST AT 20 MILES AN HOUR. SHEEHAN
Special weather statement, Jul 18, 7:05 AM CDT, 3 hours 15 minutes before
SDZ018-IAZ001-181310- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 706 AM CDT WED JUL 18 1990 AT 7AM CDT THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED ACROSS NORTHWEST IOWA AND EXTREME SOUTHEAST SOUTH DAKOTA. A LINE OF THUNDERSTORMS EXTENDED FROM 20 MILES NORTHWEST OF SPENCER TO 20 MILES SOUTHWEST OF SPENCER IOWA. ANOTHER THUNDERSTORM WAS LOCATED 10 MILES SOUTH OF SIOUX FALLS. THESE THUNDERSTORMS CONTAIN VERY HEAVY RAIN AND FREQUENT LIGHTNING AND ARE CAPABLE OF PRODUCING GUSTY SURFACE WINDS AND HAIL. PEOPLE IN NORTHWEST IOWA SHOULD KEEP ON THE ALERT AND BE PREPARED TO SEEK SHELTER IF THREATNING WEATHER APPROACHES. MOVEMENT WAS EAST AT 20 MILES AN HOUR. SHEEHEAN
Special weather statement, Jul 18, 8:03 AM CDT, 2 hours 17 minutes before
SDZ018-IAZ001-181410- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 804 AM CDT WED JUL 18 1990 AT 8 AM CDT THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED 10 MILES SOUTHEAST AND 15 MILES EAST OF SIOUX FALLS SOUTH DAKOTA. THESE THUNDERSTORMS ARE PRODUCING VERY HEAVY RAIN AND MAY BE ACCOMPANIED BY GUSTY SURFACE WINDS AND HAIL. OTHER SHOWERS AND THUNDERSTORMS EXTENDED FROM 20 MILES SOUTHEAST OF SIOUX FALLS TO 20 MILES SOUTH OF SPENCER IOWA. MOVEMENT WAS EAST AT 20 MILES AN HOUR. SHEEHAN
Special weather statement, Jul 18, 9:02 AM CDT, 1 hour 18 minutes before
SDZ018-IAZ001-181510- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 902 AM CDT WED JUL 18 1990 AT 9 AM CDT THUNDERSTORMS WITH VERY HEAVY RAIN WERE LOCATED 15 MILES SOUTHEAST AND 40 MILES SOUTHEAST OF SIOUX FALLS SOUTH DAKOTA. THESE THUNDERSTORMS ARE PRODUCING VERY HEAVY RAIN...GUSTY SURFACE WINDS AND SMALL HAIL. OTHER SHOWERS AND THUNDERSTORMS EXTENDED FROM 15 MILES SOUTHWEST OF SIOUX FALLS NEAR LENNOX TO 20 MILES SOUTH OFH SPENCER IOWA NEAR SIOUX RAPIDS IOWA. MOVEMENT WAS EAST AT 25 MILES AN HOUR. BERG
Special weather statement, Jul 18, 10:02 AM CDT, 18 minutes before
SDZ018-020-IAZ001-181610- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 10 AM CDT WED JUL 18 1990 AT 10 AM CDT SCATTERED THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED ACROSS SOUTHEAST SOUTH DAKOTA AND NORTHWEST IOWA. THESE THUNDERSTORMS ARE PRODUCING VERY HEAVY RAIN...GUSTY SURFACE WINDS AND SMALL HAIL. THE PRECIPITATION WAS LOWCATED ALONG A LINE FROM 20 MILES WEST OF YANKTON NEAR TYNDALL TO 10 MILES WEST OF SPENCER IOWA NEAR HARTLEY. MOVEMENT WAS EAST AT 25 MILES AN HOUR. BERG
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, 4:36 AM CDT | Severe Thunderstorm Warning | FSD | Turner | 21 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, 10:54 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.