Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 70, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 22, 1997, 9:45 PM CDT for Grundy County, Iowa. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jun 22, 1997, 9:45 PM CDT (02:45 UTC)
- Expired
- Jun 22, 1997, 10:15 PM CDT
- In force
- 30 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Grundy County, IA
The radar
The Des Moines radar (KDMX), 107 km from the middle of the area, began a volume at 02:46 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 22, 9:00 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.8 hours before the alert went out and 208 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
- 3560 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 971 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
290
WUUS1 KDSM 230244 RRA
SVRDSM
IAC075-230315-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
945 PM CDT SUN JUN 22 1997
* SEVERE THUNDERSTORM WARNING FOR
GRUNDY COUNTY - NORTHEASTERN IOWA
* UNTIL 1015 PM CDT
* SOME AREAS AFFECTED
WELLSBURG
HOLLAND
GRUNDY CENTER
* AT 940 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM JUST NORTHWEST OF
WELLSBURG...50 MILES SOUTH OF MASON CITY MOVING SOUTHEAST AT 20 MPH.
* THE STORM WILL BE NEAR HOLLAND AT 1005 PM CDT.
THIS IS A DANGEROUS STORM. DO NOT GO OUTDOORS.
S2What 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, Jun 22, 7:30 PM CDT, 2 hours 15 minutes before
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE DES MOINES IA 730 PM CDT SUN JUN 22 1997 TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS... DATE(CDT) ....COUNTY LOCATION.... 548 PM DAKOTA CITY IA 1.75 INCH HAIL 06/22/97 HUMBOLDT 603 PM HUMBOLDT IA 2.75 INCH HAIL 06/22/97 HUMBOLDT 648 PM KANAWHA IA 1.00 INCH HAIL 06/22/97 HANCOCK
Local storm report, Jun 22, 7:32 PM CDT, 2 hours 13 minutes before
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE DES MOINES IA 730 PM CDT SUN JUN 22 1997 TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS... DATE(CDT) ....COUNTY LOCATION.... 548 PM DAKOTA CITY IA 1.75 INCH HAIL 06/22/97 HUMBOLDT 603 PM HUMBOLDT IA 2.75 INCH HAIL 06/22/97 HUMBOLDT 648 PM KANAWHA IA 1.00 INCH HAIL 06/22/97 HANCOCK
Local storm report, Jun 22, 7:34 PM CDT, 2 hours 11 minutes before
PRELIMINARY LOCAL STORM REPORT...COR FOR ADDITIONAL REPORT NATIONAL WEATHER SERVICE DES MOINES IA 734 PM CDT SUN JUN 22 1997 TIME(CDT) .....CITY LOCATION..... ST ...EVENT/REMARKS... DATE(CDT) ....COUNTY LOCATION.... 546 PM HUMBOLDT IA 1.75 INCH HAIL 06/22/97 HUMBOLDT 548 PM DAKOTA CITY IA 1.75 INCH HAIL 06/22/97 HUMBOLDT 603 PM HUMBOLDT IA 2.75 INCH HAIL 06/22/97 HUMBOLDT 648 PM KANAWHA IA 1.00 INCH HAIL 06/22/97 HANCOCK
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 8:34 PM CDT | Severe Thunderstorm Warning | DMX | Franklin, Wright | 31 min |
| Jun 22, 9:03 PM CDT | Severe Thunderstorm Warning | DMX | Hancock, Winnebago | 32 min |
| Jun 22, 9:05 PM CDT | Severe Thunderstorm Warning | DMX | Franklin | 35 min |
| Jun 22, 9:34 PM CDT | Severe Thunderstorm Warning | DMX | Franklin | 31 min |
| Jun 22, 9:41 PM CDT | Severe Thunderstorm Warning | DMX | Winnebago | 29 min |
| Jun 22, 9:58 PM CDT | Severe Thunderstorm Warning | DMX | Butler | 47 min |
| Jun 22, 10:06 PM CDT | Severe Thunderstorm Warning | DMX | Hancock | 34 min |
| Jun 22, 10:59 PM CDT | Flash Flood Warning | DMX | Franklin, Hancock, Wright | 3 hr |
| Jun 22, 10:59 PM CDT | Flash Flood Warning | DMX | Butler | 3 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.