Alert archive / Iowa / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 86, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 24, 1986, 7:19 PM CDT for Pocahontas County, Iowa. It was in force for 26 min.
The area
The counties it named.
The facts
- Issued
- Jul 24, 1986, 7:19 PM CDT (00:19 UTC)
- Expired
- Jul 24, 1986, 7:45 PM CDT
- In force
- 26 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.3 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
- 3586 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 92 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 250021 SVRDSM IAC151-250100- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 719 PM CDT THU JUL 24 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 745 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF NORTHWEST IOWA...NORTHEAST POCAHONTAS AT 715 PM RADAR INDICTAED A SEVERE THUNDERSTORM NEAR POCAHONTAS MOVING NORTHEAST AROUND 35 MILES AN HOUR. THIS STORM WAS LOCATED 35 MILES NORTHWEST OF FORT DODGE. REMEMBER..A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH..LARGE HAIL..DEADLY LIGHTNING..AND HEAVY RAINS THAT CAN QUICKLY FLOOD LOW LYING AREAS. THESE STORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING..SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE OF SAFETY IF ONE IS SPOTTED. BARLOW/CM/GF
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, Jul 24, 5:44 PM CDT, 1 hour 35 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 543 PM CDT THU JUL 24 1986 AT 535 PM CDT...STRONG THUNDERSTORMS WITH VERY HEAVY RAIN AND POSSIBLY SMALL HAIL HAD RAPIDLY DEVELOPED OVER EXTREME NORTH CENTRAL IOWA..ABOUT 15 MILES NORTH OF MASON CITY. THESE STORMS WERE PART OF A MUCH LARGER AREA OF SHOWERS AND STORMS THAT EXTENDED INTO SOUTHEAST MINNESOTA..AND NORTHEAST NEBRASKA. RAPID THUNDERSTORM ~DEVELOPEMENT IS LIKELY OVER MUCH OF NORTHWEST IOWA BY 630 PM. PEOPLE LIVNG IN NORTHWEST IOWA..SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER OVER THE NEXT TWO TO THREE HOURS. THE STORMS WERE MOVING EAST AT 40 MILES AN HOUR. BARLOW
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 9:55 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Guthrie | 35 min |
| Jul 24, 10:33 PM CDT | Severe Thunderstorm Warning | DMX | Polk | 27 min |
| Jul 24, 11:42 PM CDT | Severe Thunderstorm Warning | DMX | Iowa, Johnson, Linn | 33 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.