Alert archive / Iowa / Severe Thunderstorm Warnings in 1996
Severe Thunderstorm Warning 92, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 29, 1996, 5:04 PM CDT for Clarke County, Decatur County, Iowa. It was in force for 41 min. 3 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
- Jul 29, 1996, 5:04 PM CDT (22:04 UTC)
- Expired
- Jul 29, 1996, 5:45 PM CDT
- In force
- 41 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Clarke County, IA, Decatur County, IA
The radar
The Des Moines radar (KDMX), 94 km from the middle of the area, began a volume at 22:05 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 |
|---|---|---|---|
| Jul 29, 5:05 PM CDT | Hail 1 | Weldon, IA | |
| Jul 29, 5:10 PM CDT | Hail 0.75 | Weldon, IA | |
| Jul 29, 5:20 PM CDT | Hail 1 | Woodburn, 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, 10.1 hours before the alert went out and 222 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
- 498 J/kg
- Mixed-layer CIN
- -161 J/kg
- Mixed-layer LCL
- 945 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
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, Jul 29, 11:04 AM CDT, 6 hours before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-292100- CENTRAL IOWA THUNDERSTORM OUTLOOK...UPDATED NATIONAL WEATHER SERVICE DES MOINES IA 1105 AM CDT MON JUL 29 1996 HAZARD...ISOLATED THUNDERSTORMS WITH HAIL UP TO GOLFBALL SIZE AND STRONG WINDS IN EXCESS OF 60 MPH. AREA OF CONCERN...SOUTHWESTERN HALF STATE FROM SIOUX CITY TO AMES TO BURLINGTON. TIMING DETAILS...200 PM TO 800 PM. METEOROLOGICAL COMMENTS... INSTABILITY - -2 TO -5 WITH EXPECTED TO INCREASE TO -6 TO -10. DEWPOINTS - EXPECTED TO INCREASE TO UPPER 60 TO LOWER 70S. CAPE - INCREASE TO 3000 TO 4000 J/KG. WINDS ALOFT ARE EXPECTED TO INCREASE FURTHERING AIDING THE THE DEVELOPMENT OF STORMS. WITH SOUTHERLY OR LIGHT NORTH WINDS AT SURFACE AND STRONG WEST TO NORTHWEST WINDS ALOFT WILL PRODUCE STORM RELATIVE SHEAR WITH THE SMALL POSSIBILITY OF TORNADOES. PRECAUTIONS...THE POSSIBILITY OF SEVERE WEATHER IS A LITTLE HIGHER THIS AFTERNOON AND EVENING THAN IN PREVIOUS DAYS...SO EMERGENCY MANAGERS SHOULD MONITOR OUTLOOKS AND SHORT TERM FORECASTS CLOSELY. THE NEXT STATEMENT WILL BE ISSUED AROUND 400 PM. FORSTER
Special weather statement, Jul 29, 12:03 PM CDT, 5 hours 1 minute before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-291800- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1150 AM CDT MON JUL 29 1996 ...NO WATCHES IN AFFECT FOR THE STATE OF IOWA... DUE TO A COMPUTER GLITCH IN THE COMMUNICATION SECTION OF THE SYSTEM SEVERE WEATHER WATCHES FROM SUNDAY JULY 28TH WERE RESENT OVER THE WEATHER WIRE SYSTEM. PLEASE IGNORE THESE PRODUCTS...HOWEVER SEVERE WEATHER IS A POSSBILITY LATER ON TODAY SO PAY ATTENTION TO THE DATE AND TIME ON THE PRODUCT. FORSTER
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 2:41 PM CDT | Severe Thunderstorm Warning | DMX | Pocahontas | 29 min |
| Jul 29, 3:00 PM CDT | Severe Thunderstorm Warning | DMX | Adair | 30 min |
| Jul 29, 3:25 PM CDT | Severe Thunderstorm Warning | DMX | Madison | 35 min |
| Jul 29, 3:41 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun | 29 min |
| Jul 29, 4:27 PM CDT | Tornado Warning | DMX | Greene | 43 min |
| Jul 29, 5:52 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Union | 53 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.