Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 107, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 24, 1997, 10:05 PM CDT for Decatur County, Iowa. It was in force for 35 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 24, 1997, 10:05 PM CDT (03:05 UTC)
- Expired
- Aug 24, 1997, 10:40 PM CDT
- In force
- 35 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Decatur County, IA
The radar
The Des Moines radar (KDMX), 111 km from the middle of the area, began a volume at 03:05 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 24, 10:33 PM CDT | Thunderstorm Wind 52 | Decatur City, 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 3.1 hours before the alert went out and 226 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
- 4736 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 1163 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 87 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDSM 250305 RRA
SVRDSM
IAC053-250340-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1005 PM CDT SUN AUG 24 1997
* SEVERE THUNDERSTORM WARNING FOR
NORTHERN DECATUR COUNTY - SOUTH CENTRAL IOWA
* UNTIL 1040 PM CDT
* SOME AREAS AFFECTED
VAN WERT
GRAND RIVER
GARDEN GROVE
LEON
* AT 1004 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM JUST NORTH OF
VAN WERT OR 55 MILES SOUTH OF DES MOINES MOVING SOUTH AT 20 MPH.
* THE STORM WILL BE IN VAN WERT BY 1010 PM CDT...AND LEON BY 1025 PM
CDT.
THIS IS A DANGEROUS STORM. DO NOT GO OUTDOORS.
FORSTER/SMITHWhat 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
Local storm report, Aug 24, 5:10 PM CDT, 4 hours 55 minutes before
PRELIMINARY LOCAL STORM REPORT...FROM SATURDAY EVENING
NATIONAL WEATHER SERVICE DES MOINES IA
510 PM CDT SUN AUG 24 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1040 PM DIKE IA 60 MPH WINDS WITH
08/23/97 GRUNDY SEVERAL TREE LIMBS DOWN
1054 PM HUDSON IA .75 INCH HAIL
08/23/97 BLACK HAWK
1120 PM 2 N TRAER IA .75 INCH HAIL
08/23/97 TAMA
SMITHLocal storm report, Aug 24, 5:12 PM CDT, 4 hours 53 minutes before
PRELIMINARY LOCAL STORM REPORT...FROM SATURDAY EVENING
NATIONAL WEATHER SERVICE DES MOINES IA
510 PM CDT SUN AUG 24 1997
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1040 PM DIKE IA 60 MPH WINDS WITH
08/23/97 GRUNDY SEVERAL TREE LIMBS DOWN
1054 PM HUDSON IA .75 INCH HAIL
08/23/97 BLACK HAWK
1120 PM 2 N TRAER IA .75 INCH HAIL
08/23/97 TAMA
SMITHSpecial weather statement, Aug 24, 7:00 PM CDT, 3 hours 5 minutes before
IAZ061-062-074-075-085-086-096-097-250100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 700 PM CDT SUN AUG 24 1997 ...SEVERE THUNDERSTORM WATCH CANCELLED... THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR PARTS OF CENTRAL AND SOUTHEAST IOWA HAS BEEN CANCELLED. THE WATCH IS NO LONGER IN EFFECT FOR THE COUNTIES OF NEWTON...POWESHIEK...MARION...MAHASKA... MONROE...WAPELLO...APPANOOSE AND DAVIS. REPEATING...THE SEVERE THUNDERSTORM WATCH (715) HAS BEEN CANCELLED FOR A PORTION OF CENTRAL AND SOUTHEAST IOWA. SMITH
Special weather statement, Aug 24, 7:05 PM CDT, 3 hours before
IAZ061-062-074-075-085-086-096-097-250100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 700 PM CDT SUN AUG 24 1997 ...SEVERE THUNDERSTORM WATCH CANCELLED... THE SEVERE THUNDERSTORM WATCH THAT WAS IN EFFECT FOR PARTS OF CENTRAL AND SOUTHEAST IOWA HAS BEEN CANCELLED. THE WATCH IS NO LONGER IN EFFECT FOR THE COUNTIES OF NEWTON...POWESHIEK...MARION...MAHASKA... MONROE...WAPELLO...APPANOOSE AND DAVIS. REPEATING...THE SEVERE THUNDERSTORM WATCH (#715) HAS BEEN CANCELLED FOR A PORTION OF CENTRAL AND SOUTHEAST IOWA. SMITH
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 10:38 PM CDT | Severe Thunderstorm Warning | DMX | Decatur | 32 min |
| Aug 24, 10:46 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold | 34 min |
| Aug 24, 11:22 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold | 18 min |
| Aug 24, 11:47 PM CDT | Severe Thunderstorm Warning | DMX | Ringgold | 18 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1997Every severe thunderstorm warning in 1997
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; radar from the NEXRAD Level II archive.