Alert archive / Iowa / Severe Thunderstorm Warnings in 1996
Severe Thunderstorm Warning 63, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 20, 1996, 9:25 AM CDT for Audubon County, Cass County, Iowa. It was in force for 30 min. 2 reports 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
- Jun 20, 1996, 9:25 AM CDT (14:25 UTC)
- Expired
- Jun 20, 1996, 9:55 AM CDT
- In force
- 30 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Audubon County, IA, Cass County, IA
The radar
The Des Moines radar (KDMX), 102 km from the middle of the area, began a volume at 14:25 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 |
|---|---|---|---|
| Jun 20, 9:41 AM CDT | Thunderstorm Wind 50 | Audubon, IA | |
| Jun 20, 9:45 AM CDT | Thunderstorm Wind 50 | Audubon, 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 12:00Z, 2.4 hours before the alert went out and 123 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
- 2885 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 717 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 147 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 10.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDSM 201425
SVRDSM
IAC009-029-201455-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
925 AM CDT THU JUN 20 1996
* SEVERE THUNDERSTORM WARNING FOR
AUDUBON COUNTY - WEST CENTRAL IOWA
CASS COUNTY - SOUTHWEST IOWA
* UNTIL 955 AM CDT
* SOME LOCATIONS AFFECTED
AUDUBON
ATLANTIC
ANITA
BRAYTON
* AT 925 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM 20 MILES WEST
OF AUDUBON...OR 30 TMILES NORTHEAST OF OMAHA MOVING EAST AT 40
MPH.
* THE STORM WILL BE IN AUDUBON BY 940 AM CDT.
THIS IS A DANGEROUS STORM. DO NOT GO OUTDOORS.
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
Special weather statement, Jun 20, 5:41 AM CDT, 3 hours 44 minutes before
IAZ004>011-015>019-023>030-033>042-044>054-057>064-070>078-081>089- 092>099-201130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 535 AM CDT THU JUN 20 1996 ...PARTS OF SEVERE THUNDERSTORM WATCH NUMBER 646 HAS BEEN CANCELLED... THE STORMS WHICH HAVE HAD A HISTORY OF PRODUCING SEVERE WEATHER HAVE MOVED SOUTH...THEREFORE THE WATCH HAS BEEN CANCELLED FOR NORTHERN PORTIONS OF THE WATCH. THOSE COUNTIES CLEARED FROM THE WATCH INCLUDE EMMET...KOSSUTH...PALO ALTO...POCOHONTAS...HUMBOLT...SAC...CALHOUN... WEBSTER...CRAWFORD...CARROLL...AND GREEN. THE REMAINDER OF THE COUNTIES INCLUDED IN THE SEVERE THUNDERSTORM ARE STILL UNDER THE WATCH UNTIL 700 AM CDT. STAY TUNED FOR LATER STATEMENTS. HUNTER
Special weather statement, Jun 20, 7:06 AM CDT, 2 hours 19 minutes before
IAZ004>011-015>019-023>030-033>042-044>054-057>064-070>078-081>089- 092>099-201130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 700 AM CDT THU JUN 20 1996 ...THE THUNDERSTORM WATCH WHICH WAS IN EFFECT UNTIL 700 AM CDT HAS EXPIRED... THE STORMS WHICH PRODUCED SEVERE WEATHER OVERNIGHT HAVE WEAKENED...THUS THE SEVERE THUNDERSTORM WATCH NUMBER 646 HAS BEEN ALLOWED TO EXPIRE. SCATTERED THUNDERSTORMS PRODUCING HEAVY RAIN...BRIEFv GUSTY WINDS AND POSSIBLY SMALL HAIL WILL CONTINUE OVER THE AREA THIS MORNING...HOWEVER NO SEVERE WEATHER IS EXPECTED. STAY TUNED TO NOAA WEATHER RADIO FOR ANY UPDATES. HUNTER
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 11:44 PM CDT | Severe Thunderstorm Warning | DMX | Sac | 31 min |
| Jun 20, 12:39 AM CDT | Severe Thunderstorm Warning | DMX | Sac | 21 min |
| Jun 20, 1:00 AM CDT | Severe Thunderstorm Warning | DMX | Crawford | 25 min |
| Jun 20, 1:16 AM CDT | Flash Flood Warning | DMX | Sac | 3 hr |
| Jun 20, 1:23 AM CDT | Severe Thunderstorm Warning | DMX | Crawford | 32 min |
| Jun 20, 9:49 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Guthrie | 41 min |
| Jun 20, 10:16 AM CDT | Severe Thunderstorm Warning | DMX | Dallas, Madison | 44 min |
| Jun 20, 10:36 AM CDT | Severe Thunderstorm Warning | DMX | Polk, Warren | 39 min |
| Jun 20, 10:51 AM CDT | Severe Thunderstorm Warning | DMX | Madison, Union | 29 min |
| Jun 20, 1:18 PM CDT | Flash Flood Warning | DMX | Audubon | 3 hr |
| Jun 20, 4:23 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 37 min |
| Jun 20, 5:11 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 34 min |
| Jun 20, 5:32 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 43 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 1996Every severe thunderstorm warning in 1996
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.