Alert archive / Iowa / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 151, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 4, 1990, 5:37 PM CDT for Adair County, Iowa. It was in force for 38 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
- Jul 4, 1990, 5:37 PM CDT (22:37 UTC)
- Expired
- Jul 4, 1990, 6:15 PM CDT
- In force
- 38 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Adair 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 |
|---|---|---|---|
| Jul 4, 5:54 PM CDT | Hail 1 | Adair, 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 12:00Z, 10.6 hours before the alert went out and 159 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 042238
SVRDSM
IAC001-042315-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
537 PM CDT WED JUL 4 1990
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 615 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTHWEST IOWA
...NORTHWESTERN ADAIR
AT 535 PM CDT...WEATHER RADAR IN DES MOINES INDICATED A SEVERE
THUNDERSTORM DEVELOPING OVER NORTHWEST ADAIR COUNTY...OR ABOUT 50
MILES WEST OF DES MOINES.
THE STORM WAS NEARLY STATIONARY. THIS STORM WILL AFFECT RURAL AREAS
OF ADAIR COUNTY. LARGE HAIL AND EXTREMELY HEAVY RAIN IS POSSIBLE WITH
THIS STORM.
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, 1 hour 34 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, 1 hour 33 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
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 6:15 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Madison | 45 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.