Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 173, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 26, 1990, 6:35 AM CDT for Wright County, Iowa. It was in force for 30 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
- Aug 26, 1990, 6:35 AM CDT (11:35 UTC)
- Expired
- Aug 26, 1990, 7:05 AM CDT
- In force
- 30 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Wright 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 |
|---|---|---|---|
| Aug 26, 6:47 AM CDT | Hail 0.75 | Wright, 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
Minneapolis, MN (KSTC), launched 00:00Z, 11.6 hours before the alert went out and 236 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
- 3299 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 1021 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDSM 261136
SVRDSM
IAC091-197-261205-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
635 AM CDT SUN AUG 26 1990
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 705 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN NORTH CENTRAL IOWA
...SOUTHEASTERN HUMBOLDT...WESTERN WRIGHT
AT 630 AM...WEATHER RADAR IN DES MOINES INDICATED A SEVERE
THUNDERSTORM OVER SOUTHEAST HUMBOLDT COUNTY...OR ABOUT 12 MILES
NORTH-NORTHEAST OF FORT DODGE.
THE STORM WAS MOVING NORTHEAST AT 20 TO 25 MILES AN HOUR...AND WILL
AFFECT THE COMMUNITIES OF THOR...EAGLE GROVE...GOLDFIELD...HOLMS...AND
CLARION BETWEEN 635 AND 700 AM THIS MORNING.
THIS STORM PRODUCED ONE INCH DIAMETER HAIL AT 625 AM THIS MORNING
ABOUT 2 MILES NORTH OF THE FORT DODGE AIRPORT.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60
MPH...DESTRUCTIVE HAIL...DEADLY LI\GHTNING...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, Aug 26, 4:48 AM CDT, 1 hour 47 minutes before
IAZALL-261030- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 445 AM CDT SUN AUG 26 1990 AN ISOLATED STRONG THUNDERSTORM WAS OVER NORTHWEST IOWA. AT 428 AM... THE THUNDERSTORM WAS 45 MILES SOUTHWEST OF FORT DODGE...OR JUST SOUTH- WEST OF LAKE VIEW. THIS STORM IS LIKELY PRODUCING EXTREMELY HEAVY RAINS...PEA TO MARBLE SIZE HAIL AND WIND GUSTS OF 30 TO 40 MILES AN HOUR. THE STORM WAS MOVING NORTHEAST AT 20 MILES AN HOUR. THE STORM WILL BE MOVING THROUGH THE LAKE VIEW AREA TO AROUND ROCKWELL CITY BY 530 AM. THIS STORM WAS PART OF A CLUSTER OF THUNDERSTORMS THAT WAS LOCATED BETWEEN IDA GROVE AND JEFFERSON. OTHER ISOLATED SHOWERS AND THUNDER- STORMS WERE OVER WEST CENTRAL IOWA NEAR DENISON AND IN THE NORTHWEST JUST SOUTHEAST OF SIOUX FALLS SOUTH DAKOTA. THESE SHOWERS AND STORMS WERE ALSO MOVING NORTHEAST AT 20 MILES AN HOUR. THUNDERSTORMS WERE ALSO OCCURRING OVER SOUTHERN MINNISOTA...JUST NORTH THE BORDER...NORTH OF MASON CITY. DLF
Special weather statement, Aug 26, 5:48 AM CDT, 47 minutes before
IAZALL-261130- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 545 AM CDT SUN AUG 26 1990 A CLUSTER OF STRONG THUNDERSTORMS WAS OVER NORTH CENTRAL AND NORTHWEST IOWA. AT 530 AM...THE THUNDERSTORMS WERE LOCATED FROM 10 MILES SOUTH OF FORT DODGE TO ROCKWELL CITY...25 MILES SOUTHWEST OF FORT DODGE. THE CALHOUN COUNTY SHERIFFS OFFICE REPORTED THAT BRIEF HEAVY RAINS AND WINDS UP TO 40 MILES AN HOUR OCCURRED WITH THE STORMS AS THE PASSED OVER ROCKWELL CITY. THE STORMS WERE MOVING NORTHEAST AT 20 MILES AN HOUR. THE STORMS WILL BE PASSING THROUGH MANSON AND FORT DODGE TO JUST SOUTH OF HUMBOLT AND EAGLE GROVE BY 630 AM. IN ADDITION TO THE HEAVY RAINS AND GUSTY WINDS ...SOME SMALL HAIL IS POSSIBLE FROM THESE STORMS. ISOLATED THUNDERSTORMS WERE ALSO OVER SOUTHWEST IOWA...EAST OF COUNCIL BLUFFS NEAR AVOCA AND IN NORTHWEST IOWA...SOUTHEAST OF SIOUX FALLS SOUTH DAKOTA...NEAR SIBLEY. THESE STORMS WERE AL+SO MOVING NORTHEAST AT 20 MILES AN HOUR. DLF
Special weather statement, Aug 26, 6:01 AM CDT, 34 minutes before
IAZALL-262300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 600 AM CDT SUN AUG 26 1990 ...HOT TEMPERATURES AND UNPLEASANT HUMIDITY WILL OCCUR ACROSS IOWA... TYPICAL AUGUST WEATHER IS EXPECTED OVER THE STATE FROM MIDDAY INTO THE EVENING HOURS AS TEMPERATURES CLIMB INTO THE UPPER 80S TO MIDDLE 90S. THE COMBINATION OF HEAT AND HUMIDITY WILL PRODUCE HEAT INDICES IN THE UPPER 90S IN EXTREME NORTHEAST IOWA TO AROUND 107 DEGREES IN THE SOUTHWEST QUARTER. PEOPLE WORKING OUT-OF-DOORS...THOSE LIVING IN UN-AIRCONDITIONED SPACES ...THE ELDERLY...AND PEOPLE IN POOR HEALTH SHOULD TAKE PRECAUTIONS. PROLONGED EXPOSURE TO THESE CONDITIONS OR STRENUOUS PHYSICAL ACTIVITY CAN LEAD TO HEAT EXHAUSTION OR POSSIBLE HEAT STROKE. PEOPLE ATTENDING OUTDOOR EVENTS SUCH AS THE IOWA STATE FAIR SHOULD WEAR LIGHT-COLORED...LOOSE-FITTING CLOTHING...HAVE PROTECTION FROM THE SUN AND DRINK PLENTY OF NON-ALCOHOLIC LIQUIDS. SLIGHTLY HIGHER HEA;T INDICES ARE EXPECTED MONDAY. MYERS
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 6:35 AM CDT | Severe Thunderstorm Warning | DMX | Humboldt | 18 min |
| Aug 26, 7:04 AM CDT | Severe Thunderstorm Warning | DMX | Wright | 31 min |
| Aug 26, 7:43 AM CDT | Severe Thunderstorm Warning | DMX | Allamakee | 37 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.