Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 116, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 18, 1990, 7:44 PM CDT for Lyon County, Iowa; Rock County, Minnesota. It was in force for 31 min.
The area
The counties it named.
The facts
- Issued
- Jul 18, 1990, 7:44 PM CDT (00:44 UTC)
- Expired
- Jul 18, 1990, 8:15 PM CDT
- In force
- 31 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Lyon County, IA, Rock County, MN
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, 0.7 hours before the alert went out and 231 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
- 398 J/kg
- Mixed-layer CIN
- -334 J/kg
- Mixed-layer LCL
- 1369 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 329 m²/s²
- 0-3 km storm-relative helicity
- 643 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 26.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KFSD 190045
SVRFSD
IAC119-MNC133-190115-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
744 PM CDT WED JUL 18 1990
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 815 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN NORTHWEST IOWA
...NORTHWESTERN LYON
IN SOUTHWEST MINNESOTA
...ROCK
SOME CITIES INCLUDED IN THIS WARNING ARE MANELY...BEAVER
CREEK...LUVERNE...AND HILLS IN MINNESOTA...LARCHWOOD...LESTER... AND
ROCK RAPIDS IN IOWA.
AT 735 PM CDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM 30
MILES NORTHEAST OF SIOUX FALLS NEAR JASPER TO 5 MILES EAST OF SIOUX
FALLS NEAR BRANDON MOVING EAST AT 15 MPH.
IF YOU ARE IN THE PATH OF THIS STORM...YOU SHOULD GET TO A
REINFORCED SHELTER. A SEVERE THUNDERSTORM PRODUCES 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.
THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE
OR NO ADVANCE WARNING SO BE ON THE LOOKOUT.
DIRCKSENWhat 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, 6:26 PM CDT, 1 hour 18 minutes before
SDZALL-190025- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 625 PM CDT WED JUL 18 1990 ...TORNADO WATCH MUCH OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL 9 PM CDT... A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL 9 PM CDT... AT 615 PM CDT SCATTERED THUNDERSTORMS CONTINUED OVER CENTRAL...EASTERN AND PARTS OF SOUTHWEST SOUTH DAKOTA. LOCALLY HEAVY RAIN...STRONG GUSTY WINDS AND HAIL HAS BEEN OCCURRING WITH SOME OF THESE STORMS. OTHERWISE SKIES WERE PARTLY CLOUDY OVER THE STATE. TEMPERATURES RANGED FROM 66 AT BROOKINGS TO 93 AT CHAMBERLAIN. THROUGH 8 PM CDT SCATTERED THUNDERSTORMS WILL CONTINUE OVER CENTRAL AND EASTERN SOUTH DAKOTA WITH A FEW ALSO POSSIBLE OVER THE WESTERN THIRD OF THE STATE. A FEW SEVERE STORMS WILL CONTINUE TO BE POSSIBLE CENTRAL AND EAST. TEMPERATURES WILL FALL 3 TO 6 DEGREES...EXCEPT THEY MAY FALL OR RISE ABOUT 15 DEGREES IN THOSE AREAS WHERE THUNDERSTORMS MOVE INTO OR AWAY FROM. BIER
Local storm report, Jul 18, 6:45 PM CDT, 59 minutes before
STORM REPORT NATIONAL WEATHER SERVICE HURON SD 643 PM CDT WED JUL 18 1990 STORM DATA FOR WED JUL 18TH TIME COUNTY...LOCATION CHARACTER OF STORM...DAMAGE 1821 CDT SANBORN COU NTY...2W LETCHER 3/4 INCH HAIL...NWS SPOTTER END FREDERICK
Special weather statement, Jul 18, 6:52 PM CDT, 52 minutes before
SDZALL-190015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 650 PM CDT WED JUL 18 1990 ...TORNADO WATCH MUCH OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL 9 PM CDT... AT 640 PM CDT A LINE OF THUNDERSTORMS FROM 30 MILES NORTHEAST OF SIOUX FALLS TO 15 MILES SOUTHWEST OF MITCHELL. THESE THUNDERSTORMS HAVE A HISTORY OF WIND GUSTS TO 50 MILES AN HOUR... HAIL RANGING FROM PEA TO DIME SIZE...FREQUENT LIGHTNING STRIKES AND VERY HEAVY RAINFALL CAUSING SOME URBAN AND LOW LAND FLOODING. THE LINE OF THUNDERSTORMS IS MOVING SOUTHEAST AT 5 MILES AN HOUR. IF YOU ARE IN THE PATH OF THESE STORMS YOU SHOULD TAKE SHELTER IN A REINFORCED BUILDING. YOU SHOULD ALSO STAY TUNED TO NOAA WE-ATHER RADIO OR YOUR LOCAL MEDIA FOR UPDATES DURING THIS HAZARDOUS WEATHER SITUATION. EDDY
Special weather statement, Jul 18, 6:57 PM CDT, 47 minutes before
SDZALL-190015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 655 PM CDT WED JUL 18 1990 ...TORNADO WATCH MUCH OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL 9 PM CDT... AT 650 PM CDT A LINE OF THUNDERSTORMS WAS MOVING INTO NORTHERN SIOUX FALLS AND WILL AFFECT THE SIOUX FALLS AREA BY 730 PM. THESE THUNDERSTORMS HAVE A HISTORY OF WIND GUSTS TO 50 MILES AN HOUR... HAIL RANGING FROM PEA TO DIME SIZE...FREQUENT LIGHTNING STRIKES AND VERY HEAVY RAINFALL CAUSING SOME URBAN AND LOW LAND FLOODING. THE LINE OF THUNDERSTORMS IS MOVING SOUTHEAST AT 5 MILES AN HOUR. IF YOU ARE IN THE PATH OF THESE STORMS YOU SHOULD TAKE SHELTER IN A REINFORCED BUILDING. YOU SHOULD ALSO STAY TUNED; TO NOAA WEATHER RADIO OR YOUR LOCAL MEDIA FOR UPDATES DURING THIS HAZARDOUS WEATHER SITUATION. EDDY
Local storm report, Jul 18, 7:09 PM CDT, 35 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE HURON SD
708 PM CDT WED JUL 18 1990
STORM DATA FOR WED JUL 18TH
TIME COUNTY...LOCATION CHARACTER OF STORM...DAMAGE
1812 CDT STANLEY COUNTY...2E HAYES 1 3/4 INCH HAIL...NWS SPOTTER
1848 CDT STANLEY COUNTY...2E HAYES 1 3/4 INCH HAIL...NWS SPOTTER
1840 CDT MINER COUNTY...2N EPIPIPHANY MARBLE AND LARGER SIZE HAIL
SHERIFF
1847 MCDT STANLEY COUNTY...7SE HAYES 1 3/4 INCH HAIL...NWS SPOTTER
END
FREDERICKSpecial weather statement, Jul 18, 7:21 PM CDT, 23 minutes before
SDZALL-190115- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 720 PM CDT WED JUL 18 1990 ...SEVERE WEATHER WATCHES FOR CENTRAL...EASTERN AND PART OF SOUTHWEST SOUTH DAKOTA... A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF CENTRAL AND EASTERN SOUTH DAKOTA UNTIL 9 PM CDT. SEVERE THUNDERSTORM WATCHES ARE ALSO IN EFFECT FOR EXTREME SOUTHEAST...EXTREME SOUTH CENTRAL AND A SMALL PART OF SOUTHWEST SOUTH DAKOTA THIS EVENING. AT 7 PM CDT SCATTERED THUNDERSTORMS CONTINUED OVER CENTRAL...EASTERN AND PARTS OF SOUTHWEST SOUTH DAKOTA. LOCALLY HEAVY RAIN...STRONG GUSTY WINDS AND HAIL HAS BEEN OCCURRING WITH SOME OF THESE STORMS. OTHERWISE SKIES WERE PARTLY CLOUDY OVER THE STATE. TEMPERATURES RANGED FROM 63 AT MOBRIDGE TO 86 AT RAPID CITY. THROUGH 9 PM CDT SCATTERED THUNDERSTORMS WILL CONTINUE OVER CENTRAL AND EASTERN SOUTH DAKOTA. SOME STORMS WILL BE SEVERE. TEMPERATURES WILL FALL 6 TO 10 DEGREES...EXCEPT MAY FALL OR RISE 1h5 TO 20 DEGREES IN THOSE AREAS WHERE THUNDERSTORMS MOVE INTO OR AWAY FROM. BIER
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 9:31 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 29 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1990Severe Thunderstorm Warnings in Minnesota, 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.