Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 152, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 4, 1990, 6:15 PM CDT for Adair County, Madison County, Iowa. It was in force for 45 min.
The area
The counties it named.
The facts
- Issued
- Jul 4, 1990, 6:15 PM CDT (23:15 UTC)
- Expired
- Jul 4, 1990, 7:00 PM CDT
- In force
- 45 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Adair County, IA, Madison 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, 11.3 hours before the alert went out and 178 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
- 3633 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- -57 m²/s²
- 0-3 km storm-relative helicity
- -30 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 042315
SVRDSM
IAC001-121-050000-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
615 PM CDT WED JUL 4 1990
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 700 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTHWEST IOWA
...NORTHEASTERN ADAIR
IN SOUTH CENTRAL IOWA
...NORTHWESTERN MADISON
AT 610 PM CDT...WEATHER RADAR IN DES MOINES INDICATED A SEVERE
THUNDERSTORM OVER NORTHEAST ADAIR COUNTY...OR ABOUT 35 MILES WEST OF
DES MOINES.
THE STORM WAS MOVING EAST AT ABOUT 15 MILES AN HOUR AND WILL AFFECT
THE CITIES OF GREENFIELD AND EARLHAM BETWEEN 615 AND 640 PM...AND
WINTERSETT BETWEEN 630 AND 700 PM.
THIS STORM PRODUCED HEAVY RAIN...LARGE HAIL...AND STRONG WINDS 6 MILES
NORTH OF FONTANELLE AT 554 PM CDT.
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.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 4, 4:03 PM CDT, 2 hours 12 minutes before
IAZ003-007>015-050230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 405 PM CDT WED THE FOURTH OF JULY 1990 ...EXCESSIVE HEAT OVER MUCH OF IOWA INTO THE EARLY EVENING HOURS... THE HEAT INDEX HAS REACHED HIGH LEVELS THIS AFTERNOON. TEMPERATURES IN THE 90S TO AROUND 100 DEGREES...COMBINED WITH THE RATHER HIGH RELATIVE HUMIDITY...HAVE PRODUCED A HEAT INDEX OF 105 TO 115 DEGREES THIS AFTERNOON. THESE READING WILL SLOWLY LOWER DURING THE EVENING. PEOPLE WORKING OUT-OF-DOORS...THOSE LIVING IN UN-AIRCONDITIONED SPACES ...THE ELDERLY...AND PEOPLE IN POOR HEALTH SHOULD TAKE PRECAUTIONS AS PROLONGED EXPOSURE TO THESE CONDITIONS OR STRENUOUS PHYSICAL ACTIVITY CAN LEAD TO HEAT EXHAUSTION OR POSSIBLE HEAT STROKE. HOUSEHOLD PETS ALSO NEED TO BE WATCHED...TO AVOID DANGERS OF THE HEAT. AT 400 PM TEMPERATURES WERE IN THE 90S TO NEAR 100 OVER MUCH OF IOWA...WITH FAIRLY HIGH HUMIDITY. THIS COMBINATION OF HEAT AND HUMIDITY HAS RESULTED IN HEAT INDICES OF 100 TO 110 DEGREES. THESE CONDITIONS WILL SLOWLY IMPROVE AS THE TEMPERATURES DROP NEAR SUNSET. MEANWHILE THE HEAT INDICES WILL CONTINUE TO BE HIGH. IF YOU PLAN ANY OUTDOOR ACTIVITY...EVEN JUST BEING OUT TO VIEW FIWREWORKS...USE CAUTION AND SEEK HELP IF YOU BEGIN TO SUFFER THE EFFECTS OF THE HEAT. DOWD
Special weather statement, Jul 4, 4:04 PM CDT, 2 hours 11 minutes before
IAZ003-007>015-050230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 405 PM CDT WED THE FOURTH OF JULY 1990 ...EXCESSIVE HEAT OVER MUCH OF IOWA INTO THE EARLY EVENING HOURS... THE HEAT INDEX HAS REACHED HIGH LEVELS THIS AFTERNOON. TEMPERATURES IN THE 90S TO AROUND 100 DEGREES...COMBINED WITH THE RATHER HIGH RELATIVE HUMIDITY...HAVE PRODUCED A HEAT INDEX OF 105 TO 115 DEGREES THIS AFTERNOON. THESE READING WILL SLOWLY LOWER DURING THE EVENING. PEOPLE WORKING OUT-OF-DOORS...THOSE LIVING IN UN-AIRCONDITIONED SPACES ...THE ELDERLY...AND PEOPLE IN POOR HEALTH SHOULD TAKE PRECAUTIONS AS PROLONGED EXPOSURE TO THESE CONDITIONS OR STRENUOUS PHYSICAL ACTIVITY CAN LEAD TO HEAT EXHAUSTION OR POSSIBLE HEAT STROKE. HOUSEHOLD PETS ALSO NEED TO BE WATCHED...TO AVOID DANGERS OF THE HEAT. AT 400 PM TEMPERATURES WERE IN THE 90S TO NEAR 100 OVER MUCH OF IOWA...WITH FAIRLY HIGH HUMIDITY. THIS COMBINATION OF HEAT AND HUMIDITY HAS RESULTED IN HEAT INDICES OF 100 TO 110 DEGREES. THESE CONDITIONS WILL SLOWLY IMPROVE AS THE TEMPERATURES DROP NEAR SUNSET. MEANWHILE THE HEAT INDICES WILL CONTINUE TO BE HIGH. IF YOU PLAN ANY OUTDOOR ACTIVITY...EVEN JUST BEING OUT TO VIEW FIXREWORKS...USE CAUTION AND SEEK HELP IF YOU BEGIN TO SUFFER THE EFFECTS OF THE HEAT. DOWD
Special weather statement, Jul 4, 5:58 PM CDT, 17 minutes before
IAZALL-042330- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 555 PM CDT WED JUL 4 1990 AT 530 PM...AN ISOLATED INTENSE THUNDERSTORM WITH EXTREMELY HEAVY RAIN AND HAIL HAD DEVELOPED RAPIDLY OVER SOUTHWEST IOWA. THE STORM WAS LOCATED 50 MILES WEST OF DES MOINES...JUST NORTHWEST OF GREENFIELD. THE STORM WAS MOVING EAST AT 15 MILES AN HOUR. BY 630 PM THE STORM WILL BE JUST NORTH OF GREENFIELD. OTHER THUNDERSTORMS HAD DEVELOPED OVER EXTREME SOUTHWEST IOWA...SOUTH OF COUNCIL BLUFFS. THESE STORMS WERE MOVING NORTHEAST AT 25 MILES AN HOUR. WIDELY SCATTERED SHOWERS WERE OVER NORTH CENTRAL IOWA. THESE SHOWER WERE MOVING NORTHEAST AT 35 MILES AN HOUR. DLF
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 5:37 PM CDT | Severe Thunderstorm Warning | DMX | Adair | 38 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.