Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 31, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 1, 1990, 11:29 PM CDT for Pocahontas County, Iowa. It was in force for 46 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jun 1, 1990, 11:29 PM CDT (04:29 UTC)
- Expired
- Jun 2, 1990, 12:15 AM CDT
- In force
- 46 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Pocahontas County, IA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 1, 11:45 PM CDT | Tornado F1 | Pocahontas, IA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.5 hours before the alert went out and 210 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
- 3589 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 241 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 KDSM 020429
SVRDSM
IAC151-020515-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1129 PM CDT FRI JUN 1 1990
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1215 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
IN NORTHWEST IOWA
...POCOHONTAS
AT 1128 PM...WEATHER RADAR INDICATED A SEVERE THUNDERSTORM ALONG THE
POCAHONTAS-CALHOUN COUNTY LINE NEAR FONDA...OR ABOUT 40 MILES WEST OF
FORT DODGE.
THE STORM WAS MOVING NORTHEAST AT 45 MILES AN HOUR...AND WILL BE
AFFECTING THE CITY OF POCAHONTAS BY 1145 PM.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.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, Jun 1, 9:21 PM CDT, 2 hours 8 minutes before
IAZALL-020400 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 920 PM CDT FRI JUN 01 1990 ...A TORNADO WATCH IS IN EFFECT FOR A SMALL PART OF NORTHWEST IOWA UNTIL 3 AM CDT SAT... AT 9 PM...A PARTLY CLOUDY SKY WAS OVER THE NORTHWEST THIRD OF IOWA THIS EVENING...WITH A PARTLY CLOUDY TO CLOUDY SKY OVER THE REMAINDER OF THE STATE. WINDS WERE SOUTH 15 TO 30 MILES AN HOUR ACORSS THE STATE...WITH TEMPERATURES IN THE 70S AND RANGED FROM 75 AT LAMONI TO 78 AT DAVENPORT/MOLINE. THE OUTLOOK TO 11 PM...CONTINUED WINDY ACROSS IOWA. SHOWERS AND THUNDERSTORMS TO DEVELOPE IN THE WEST...WITH A PARTLY CLOUDY TO CLOUDY SKY ELSEWHERE. TEMPERATURES WILL BE IN THE LOWER TO MIDDLE 70S. 0 MG
Special weather statement, Jun 1, 10:41 PM CDT, 48 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 1040 PM CDT FRI JUN 01 1990 ...TORNADO WATCH FOR EXTREME NORTHWEST IOWA UNTIL 3 AM CDT SATURDAY MORNING... AT 1025 PM...ISOLATED SHOWERS AND THUNDERSTORMS HAVE DEVELOPED IN WEST CENTRAL IOWA SINCE 930 PM CDT THIS EVENING. THE SHOWERS AND THUNDERSTORMS WERE IN A 15 MILE WIDE AREA THAT EXTENDED FROM NEAR DENISON OR 45 MILES NORTHEAST OF OMAHA/COUNCIL BLUFFS...TO 30} MILES EAST OF OMAHA/COUNCIL BLUFFS BETWEEN OAKLAND AND ATLANTIC. THE THENDERSTORMS WERE MOVING NORTHEAST AT 3O TO 35 MILES AN HOUR. MG
Special weather statement, Jun 1, 11:13 PM CDT, 16 minutes before
IAZALL-020500 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1110 PM CDT FRI JUN 01 1990 ...A TORNADO WATCH IS IN EFFECT FOR A SMALL PART OF NORTHWEST IOWA UNTIL 3 AM CDT SAT... AT 11PM...A SMALL CLUSTER OF SHOWERS AND THUNDERSTORMS WERE RACING FROM WEST CENTRAL INTO NORTHWEST IOWA. THIS CLUSTER WAS LOCATED SOME 65 TO 80 MILES NORTHWEST OF DES MOINES...NEAR MANNING...CARROLL AND LAKE VIEW. THESE SHOWERS AND STORMS WERE MOVING NORTHEAST AT 35 TO 40 MILES AN HOUR. OVER THE REMAINDER OF IOWA SKIES WERE GENERALLY PARTLY TO MOSTLY CLOUDY ...WITH TEMPERATURES IN THE LOWER TO MIDDLE 70S. WINDS WERE SOUTHERLY AT 10 TO 20 MILES AN HOUR...WITH GUSTS TO 30 OVER THE FAR NORTHWEST COUNTIES. THE OUTLOOK THROUGH 1AM...PARTLY TO MOSTLY CLOUDY SKIES CAN BE EXPECTED OVER MOST OF THE STATE...SHOWERS AND THUNDERSTORMS COULD DEVELOP OVER THE FAR WEST CENTRAL AND NORTHWEST COUNTIES. BARLOW
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 11:46 PM CDT | Tornado Warning | DMX | Pocahontas | 9 min |
| Jun 2, 11:49 AM CDT | Tornado Warning | DMX | Jefferson | 26 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.