Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 112, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 18, 1990, 12:12 PM CDT for Lyon County, Iowa; Lincoln County, South Dakota. It was in force for 33 min.
The area
The counties it named.
The facts
- Issued
- Jul 18, 1990, 12:12 PM CDT (17:12 UTC)
- Expired
- Jul 18, 1990, 12:45 PM CDT
- In force
- 33 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
Counties Lyon County, IA, Lincoln 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, 5.2 hours before the alert went out and 224 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 KFSD 181713
SVRFSD
IAC119-SDC083-181745-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1212 PM CDT WED JUL 18 1990
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1245 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN NORTHWEST IOWA
...LYON
IN SOUTHEAST SOUTH DAKOTA
...EASTERN LINCOLN
SOME CITIES INCLUDED IN THIS WARNING ARE HUDSON..FAIRVIEW AND CANTON
IN SOUTHEAST SOUTH DAKOTA ALONG WITH ROCK RAPIDS..GEOGRE AND LESTER IN
NORTHWEST IOWA.
AT 1205 PM CDT RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM 10
MILES SOUTH OF SIOUX FALLS NEAR TEA TO 35 MILES SOUTH OF SIOUX FALLS NEANORWAY CENTER. ANOTHER LINE OF SEVERE THUNDERSTORMS EXTENDED FROM 20
MILES EAST OF SIOUX FALLS NEAR LESTER IOWA TO 50 MILES SOUTHEAST OF SIOUFALLS NEAR HOSPERS IOWA. BOTH OF THE LINES OF SEVERE THUNDERSTORMS WEREMOVING EAST AT 30 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.
BEH\RENDWhat 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, 10:02 AM CDT, 2 hours 10 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
Special weather statement, Jul 18, 11:02 AM CDT, 1 hour 10 minutes before
SDZ017-018-020-181710- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1102 AM CDT WED JUL 18 1990 AT 11 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 25 MILES NORTHWEST OF YANKTON NEAR SCOTLAND TO 10 MILES WEST OF SPENCER NE0AR HARTLEY IOWA. MOVEMENT WAS EAST AT 25 MILES AN HOUR. BERG
Special weather statement, Jul 18, 11:10 AM CDT, 1 hour 2 minutes before
SDZ011-DDHHMM- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HURON SD 1109 AM CDT WED JUL 18 1990 THE SEVERE THUNDERSTORM OVER NORTHERN HYDE COUNTY HAS DECREASED IN INTENSITY...CANCEL THE THUNDERS6TORM WARNING. HUTCHEON
Special weather statement, Jul 18, 12:04 PM CDT, 8 minutes before
SDZ017-018-020-IA001-181810- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1205 AM CDT WED JUL 18 1990 AT NOON CDT SCATTERED INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED ACROSS PARTS OF SOUTHEAST SOUTH DAKOTA AND NORTHWEST IOWA. THE THUNDERSTORMS WERE IN A BAND THAT EXTENDED FROM 25 MILES NORTH/ WEST OF SIOUX FALLS NEAR SALEM TO 45 MILES SOUTHEAST OF SIOUX FALLS NEAR SIOUX CENTER IOWA. THESE THUNDERSTORMS ARE PRODUJCING VERY HEAVY RAIN AND ARE CAPABLE OF PRODUCING GUSTY SURFACE WINDS...SMALL HAIL AND DANGEROUS CLOUD TO GROUND LIGHTNING. MOVEMENT WAS EAST AT 25 MILES AN HOUR. BUSS
Local storm report, Jul 18, 12:06 PM CDT, 6 minutes before
STORM REPORT NATIONAL WEATHER SERVICE HURON SD 1205 PM CDT WED JUL 18 1990 STORM DATA FOR WED JUL 18TH TIME COUNTY...LOCATION CHARACTER OF STORM...DAMAGE 1013 CDT SULLY COUNQTY...AGAR 3/4 INCH HAIL...SHERIFF END HUTCHEON
Special weather statement, Jul 18, 12:09 PM CDT, 3 minutes before
SDZ017-018-020-181710- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1208 PM CDT WED JUL 18 1990 SCATTERED THUNDERSTORMS WILL CONTINUE DEVELOPING OVER SOUTHEAST SOUTH DAKOTA...NORTHWEST IOWA AND SOUTHWEST MINNESOTA THIS AFTERNOON. A FRONTAL BOUNDRY OVER NORTHERN PARTS OF IOWA AND NEBRASKA IS HELPING TO CAUSE THE THUNDERSTORMS. THIS FRONT IS EXPECTED TO REMAIN NEARLY STATIONARY THIS AFTERNOON INTO THIS EVENING...SO SCATTERED THUNDERSTORMS ARE EXPECTED TO CONTINUE INTO THURSDAY MORNING OVER THE AREA. PEOPLE IN SOUTHEAST SOUTH DAKOTA...NORTHWEST IOWA AND SOUTHWEST MINNESOTA CAN EXPECT TO SEE ON AND OFF THUNDERSTORMS...SOME SEVERE THIS AFTERNOON INTO THURSDAY MORNING. STRAY TUNED TO THE LOCAL MEDIA AND/OR NOAA WEATHER RADIO THIS AFTERNOON AND TONIGHT FOR UPDATES ON WEATHER CONDITIONS FOR YOUR VICINITY. EDDY
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 6:01 AM CDT | Severe Thunderstorm Warning | FSD | Lyon | 29 min |
| Jul 18, 6:26 AM CDT | Severe Thunderstorm Warning | FSD | Lyon, Osceola | 34 min |
| Jul 18, 8:40 AM CDT | Severe Thunderstorm Warning | FSD | Sioux | 35 min |
| Jul 18, 9:16 AM CDT | Severe Thunderstorm Warning | FSD | O'Brien, Sioux | 29 min |
| Jul 18, 10:54 AM CDT | Severe Thunderstorm Warning | FSD | Sioux | 66 min |
| Jul 18, 12:52 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 38 min |
| 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, 10:20 AM CDT | Severe Thunderstorm Warning | FSD | Union | 40 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, 4:34 PM CDT | Severe Thunderstorm Warning | FSD | Brookings | 41 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1990Severe 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.