Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 166, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 19, 1990, 4:46 PM CDT for Boone County, Polk County, Story County, Iowa. It was in force for 29 min.
The area
The counties it named.
The facts
- Issued
- Aug 19, 1990, 4:46 PM CDT (21:46 UTC)
- Expired
- Aug 19, 1990, 5:15 PM CDT
- In force
- 29 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Boone County, IA, Polk County, IA, Story 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 12:00Z, 9.8 hours before the alert went out and 235 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
- 3642 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 84 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 192143
SVRDSM
IAC015-153-169-192215-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
446 PM CDT SUN AUG 19 1990
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 515 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN CENTRAL IOWA
...SOUTHERN BOONE...NORTHERN POLK...SOUTHERN STORY
AT 445 PM CDT...WEATHER RADAR IN DES MOINES INDICATED A SEVERE
THUNDERSTORM ABOUT 15 MILES NORTH OF DES MOINES. THIS STORM WILL BE
AFFECTING THE TOWNS HUXLEY..LUTHER...ANKENY AND AMES.
BOATERS ON SAYLORVILE LAKE SHOULD SEEK SAFE SHELTER IMMEDIATELY.
THE STORM WAS MOVING NORTHEAST AT 30 MILES AN HOUR.
JM
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 F!LOOD 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, Aug 19, 4:23 PM CDT, 23 minutes before
IAZ010-192215- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 420 PM CDT SUN AUG 18 1990 THUNDERSTORMS HAD DEVEOLOPED JUST TO THE WEST AND NORTH OF DES MOINES. AT 415 PM...THE THUNDERSTORMS WERE LOCATED OVER THE WESTERN AND NORTHERN SUBURBS. THE STORMS WERE MOVING NORTHEAST AT 25 MILES AN HOUR. BRIEF HEAVY RAINS AND WIND GUSTS OF 30 TO 40 MILES WILL OCCUR WITH THUNDERSTORMS. THE SOUTHERN AND EASTERN SECTIONS OF THE METRO AREA WILL ESCAPE MOST OF THE RAIN FROM THESE STORMS. HOWEVER...THE ATMOSPHERE IS RIPE FOR THUNDERSTORM DEVELOPMENT AND STORMS MAY POP UP JUST ABOUT ANYWHERE IN CENTRAL IOWA DURING THE NEXT COUPLE OF HOURS. DLF
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 8:39 PM CDT | Severe Thunderstorm Warning | DMX | Emmet, Palo Alto | 21 min |
| Aug 18, 9:04 PM CDT | Severe Thunderstorm Warning | DMX | Kossuth, Palo Alto | 41 min |
| Aug 19, 5:53 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Wright | 27 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; the sounding from the Mesonet's radiosonde archive.