Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 45, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at May 12, 1986, 9:50 PM CDT for Calhoun County, Pocahontas County, Iowa. It was in force for 50 min.
The area
The counties it named.
The facts
- Issued
- May 12, 1986, 9:50 PM CDT (02:50 UTC)
- Expired
- May 12, 1986, 10:40 PM CDT
- In force
- 50 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Calhoun County, IA, Pocahontas County, IA
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 00:00Z, 2.8 hours before the alert went out and 198 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
- 3590 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 193 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, May 12, 8:42 PM CDT, 1 hour 8 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 835 PM CDT MON MAY 12 1986 ...SEVERE THUNDERSTORM WATCH FOR PART OF NORTHERN IOWA UNTIL 9 PM... ..SEVERE THUNDERSTORM WATCH FOR MUCH OF THE WESTERN HALF TIL MIDNIGHT.. NO SEVERE WEATHER WAS REPORTED IN IOWA FROM 730 TO 830 PM. AT 830 PM... OVERALL..THE THUNDERSTORMS ACROSS WESTERN IOWA HAVE WEAKENED SOME..AND BECOME LESS ORGANIZED. THE HEAVIEST STORMS WERE JUST SOUTH OF CORNING ...ALSO NEAR DENISON...AND JUST WEST OF POCAHONTAS. THE SHOWERS AND STORMS HAD SPLIT INTO 2 SECTIONS. ONE EXTENDED FROM WINTERSET AND ADEL SOUTHWESTWARD THROUGH CRESTON TO BEDFORD. THE OTHER LAYED FROM EMMETSBURG !THROUGH STORM LAKE TO DENISON. THE SHOWERS AND STORMS WERE MOVING VERY SLOWLY TO THE EAST AROUND 10 MILES AN HOUR. POTTS
Special weather statement, May 12, 9:22 PM CDT, 28 minutes before
<PQ< SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 920 PM CDT MON MAY 12 1986 SEVERE THUNDERSTORM WATCH NUMBER 151 THAT WAS IN EFFECT FOR PARTS OF EXTREME NORTHWEST AND NORTH CENTRAL IOWA EXPIRED AT 9PM CDT. THE OTHER SEVERE THUNDERSTORM WATCH NUMBER 152 THAT WAS IN EFFECT FOR MUCH OF WEST CENTRAL AND SOUTHWEST IOWA HAS ALSO BEEN CANCELLED. IT DOES REMAIN IN EFFECT FOR PARTS OF NORTHWEST MISSOURI UNTIL MIDNIGHT. SCA?TTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER PARTS OF IOWA THROUGHOUT THE NIGHT BUT NO SEVERE STORMS ARE ANTICIPATED. ADAMS
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 7:20 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 23 min |
| May 12, 8:08 PM CDT | Severe Thunderstorm Warning | DMX | Taylor | 52 min |
| May 13, 12:36 AM CDT | Severe Thunderstorm Warning | DMX | Jefferson, Wapello | 39 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1986Every severe thunderstorm warning in 1986
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.