Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 30, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at May 18, 1990, 10:06 PM CDT for Boone County, Dallas County, Iowa. It was in force for 41 min. 2 reports 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
- May 18, 1990, 10:06 PM CDT (03:06 UTC)
- Expired
- May 18, 1990, 10:47 PM CDT
- In force
- 41 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Boone County, IA, Dallas 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 |
|---|---|---|---|
| May 18, 10:07 PM CDT | Hail 0.75 | Dallas, IA | |
| May 18, 10:28 PM CDT | Thunderstorm Wind 52 | Boone, 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, 3.1 hours before the alert went out and 207 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
- 3572 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 218 m²/s²
- 0-3 km storm-relative helicity
- 319 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 190309
SVRDSM
IAC015-049-190400-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1006 PM CDT FRI MAY 18 1990
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1100 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN CENTRAL IOWA
...SOUTHERN BOONE...NORTHERN DALLAS
AT 1005 PM CDT RADAR INDICATED A SEVERE STORM ON THE DALLAS-BOON
COUNTY LINE JUST TO THE NORTHWEST OF PERRY OR ABOUT 35 MILES TO THE
NORTHWEST OF DES MOINES.
THE STORM WAS MOVING TO THE EAST AT 25 MILES AN HOUR AND WILL BE
MOVING INTO THE PERRY AREA SOON AND TO THE MADRID AREA AROUND
1030 PM.
IN ADDITION TO LARGE HAIL AND STRONG WINDS THESE STORMS ARE PRODUCING
HEAVY RAINS THAT MAY CAUSE SOME FLASH FLOODING.
THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN GREEN COUNTY HAS EXPIRED
AND WILL NOT BE CONTINUED SINCE THE STORM MOVED OUT OF THAT COUNTY.
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.
CWWhat 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 18, 6:12 PM CDT, 3 hours 54 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 610 PM CDT FRI MAY 18 1990 ...TORNADO WATCH IN EFFECT FOR SMALL PART OF NORTHWEST IOWA UNTIL MIDNIGHT... SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CONTINUED ACROSS THE WEST CENTRAL AND NORTHWEST COUNTIES OF IOWA. THE STRONGEST STORMS WERE IN NORTHERN MONONA COUNTY...ABOUT MIDWAY BETWEEN SIOUX CITY AND OMAHA/ COUNCIL BLUFFS. MOVEMENT WAS EAST AT 35 MILES AN HOUR. BETWEEN 8 6AND 9 PM THE LEADING EDGE OF THE SHOWERS AND STORMS WILL BE ALONG A FORT DODGE...OMAHA/COUNCIL BLUFFS LINE. KS
Special weather statement, May 18, 6:41 PM CDT, 3 hours 25 minutes before
IAZALL-190100- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 640 PM CDT FRI MAY 18 1990 AT 632 PM...NUMEROUS SHOWERS AND WIDELY SCATTERED THUNDERSTORMS WERE OVER WEST CENTRAL AND NORTHWEST IOWA. THE RAINFALL WAS WEST OF AN OMAHA/COUNCIL BLUFFS...MASON CITY LINE. THE STRONGEST STORMS WERE ACROSS MONONA COUNTY...ABOUT MIDWAY BETWEEN SIOUX CITY AND OAMHA/COUNCIL BLUFFS. ALONG THE THE BRIEF HEAVY RAINS ...PEA hSIZE HAIL WAS OCCURRING WITH THESE STORMS. THE SHOWERS AND STORMS WERE MOVING EAST AT 35 MILES AN HOUR. KS
Special weather statement, May 18, 6:45 PM CDT, 3 hours 21 minutes before
IAZALL-190100- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY ...HEADLINE WATCH... NATIONAL WEATHER SERVICE DES MOINES IA 640 PM CDT FRI MAY 18 1990 ...TORNADO WATCH IN EFFECT FOR SMALL PART OF NORTHWEST IOWA UNTIL MIDNIGHT... AT 632 PM...NUMEROUS SHOWERS AND WIDELY SCATTERED THUNDERSTORMS WERE OVER WEST CENTRAL AND NORTHWEST IOWA. THE RAINFALL WAS WEST OF AN OMAHA/COUNCIL BLUFFS...MASON CITY LINE. THE STRONGEST STORMS WERE ACROSS MONONA COnUNTY...ABOUT MIDWAY BETWEEN SIOUX CITY AND OMAHA/COUNCIL BLUFFS. ALONG THE THE BRIEF HEAVY RAINS ...PEA SIZE HAIL WAS OCCURRING WITH THESE STORMS. THE SHOWERS AND STORMS WERE MOVING EAST AT 35 MILES AN HOUR. KS
Special weather statement, May 18, 7:09 PM CDT, 2 hours 57 minutes before
IAZALL-190200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 710 PM CDT FRI MAY 18 1990 ...TORNADO WATCH IN EFFECT FOR SMALL PART OF NORTHWEST IOWA UNTIL MIDNIGHT... AT 705 PM...NUMEROUS SHOWERS AND WIDELY SCATTERED THUNDERSTORMS WERE ACROSS THE NORTHWEST QUARTER OF IOWA...NORTHWEST OF AN OMAHA/COUNCIL BLUFFS...MASON CITY LINE. THE STRONGEST STORMS...PRODUCING HEAVY RAINS AND PEA SIZE HAIL...WERE APPROACHING DENISON...50 M ILES SOUTHEAST OF SIOUX CITY. THE SHOWERS AND STORMS WERE MOVING EAST AT 35 MILES AN HOUR. KS
Special weather statement, May 18, 9:54 PM CDT, 12 minutes before
IAZALL-190200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 945 PM CDT FRI MAY 18 1990 ...TORNADO WATCH IN EFFECT FOR SMALL PART OF NORTHWEST IOWA UNTIL MIDNIGHT... AT 935 PM...A NARROW AREA OF INTENSE THUNDERSTORMS WAS LOCATED IN CENTRAL IOWA...EXTENDING FROM AUDUBON...ABOUT 55 MILES WEST OF DES MOINES...TO JEWELL...OR 50 MILES NORTH OF DES MOINES. THESE THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINS...SURFACE WINDS IN EXCESS OF 40 MILES AN HOUR...AND HAIL UP TO 1 INCH IN DIAMETER. COON RAPIDS REPORTED TWO INCHES OF RAIN IN 30 MINUTES AND HAIL UP TO 1 INCH COVERING THE GROUND. OTHER SHOWERS AND THUNDERSTORMS WERE LOCATED TO THE NORTH AND NORTHWEST OF THIS AREA...AND COVERED MOST NORTH CENTRAL AND A SMALL PART OF NORTH WEST IOWA. THESE THUNDERSTORMS WERE MOVING TO THE EAST AT 30 MILES AN HOUR KS/BS
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 8:00 PM CDT | Flash Flood Warning | DMX | Crawford | 60 min |
| May 18, 8:28 PM CDT | Severe Thunderstorm Warning | DMX | Carroll | 47 min |
| May 18, 9:16 PM CDT | Severe Thunderstorm Warning | DMX | Greene | 44 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.