Alert archive / Iowa / Severe Thunderstorm Warnings in 1996
Severe Thunderstorm Warning 66, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 20, 1996, 10:36 AM CDT for Polk County, Warren County, Iowa. It was in force for 39 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 20, 1996, 10:36 AM CDT (15:36 UTC)
- Expired
- Jun 20, 1996, 11:15 AM CDT
- In force
- 39 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Polk County, IA, Warren County, IA
The radar
The Des Moines radar (KDMX), 28 km from the middle of the area, began a volume at 15:38 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 nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 3.6 hours before the alert went out and 235 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
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, Jun 20, 5:41 AM CDT, 4 hours 55 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, 3 hours 30 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, 9:25 AM CDT | Severe Thunderstorm Warning | DMX | Audubon, Cass | 30 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, 10:51 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.