Alert archive / Iowa / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 423, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Sep 23, 2008, 3:23 PM CDT for Shelby County, Iowa. It was in force for 37 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
- Sep 23, 2008, 3:23 PM CDT (20:23 UTC)
- Expired
- Sep 23, 2008, 4:00 PM CDT
- In force
- 37 min
- Issued by
- NWS Omaha, NE
- Area
- Storm-based polygon
County Shelby County, IA
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 8.4 hours before the alert went out and 97 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
- 136 J/kg
- Mixed-layer CIN
- -279 J/kg
- Mixed-layer LCL
- 969 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 280 m²/s²
- 0-3 km storm-relative helicity
- 385 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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.
NWS Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 23, 3:20 AM CDT, 12 hours 3 minutes earlier.
Area forecast discussion, Sep 23, 3:20 AM CDT, 12 hours 3 minutes before
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</html>Hazardous weather outlook, Sep 23, 12:50 PM CDT, 2 hours 33 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1250 PM CDT TUE SEP 23 2008 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-232300- ANTELOPE-BOONE-BURT-BUTLER-CASS-CEDAR-COLFAX-CUMING-DODGE-DOUGLAS- FREMONT IA-GAGE-HARRISON IA-JEFFERSON-JOHNSON-KNOX-LANCASTER-MADISON- MILLS IA-MONONA IA-MONTGOMERY IA-NEMAHA-OTOE-PAGE IA-PAWNEE-PIERCE- PLATTE-POTTAWATTAMIE IA-RICHARDSON-SALINE-SARPY-SAUNDERS-SEWARD- SHELBY IA-STANTON-THURSTON-WASHINGTON-WAYNE- 1250 PM CDT TUE SEP 23 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST NEBRASKA AND SOUTHEAST NEBRASKA. .DAY ONE...THIS AFTERNOON AND TONIGHT A COLD FRONT MOVING ACROSS THE PLAINS WILL BE THE FOCUS FOR THUNDERSTORM ACTIVITY THIS AFTERNOON FOR AREAS GENERALLY EAST OF A LINE FROM THURSTON TO DAVID CITY TO FAIRBURY IN EASTERN NEBRASKA... AND THEN INTO SOUTHWEST IOWA BY LATE AFTERNOON AND INTO EVENING. THERE IS A CHANCE A FEW STORMS WILL BECOME SEVERE MAINLY OVER WEST CENTRAL IOWA WITH GUSTY WINDS AND LARGE HAIL THE MAIN THREATS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THUNDERSTORMS ARE POSSIBLE WEDNESDAY NIGHT INTO THURSDAY MORNING FROM CENTRAL NEBRASKA NORTHEASTWARD INTO NORTHWEST IOWA. SEVERE WEATHER IS NOT EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MIGHT BE NEEDED LATE THIS AFTERNOON AND EVENING OVER PORTIONS OF SOUTHWEST IOWA. DEE
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 23, 3:07 PM CDT | Severe Thunderstorm Warning | OAX | Gage, Jefferson | 38 min |
| Sep 23, 4:06 PM CDT | Severe Thunderstorm Warning | OAX | Johnson, Nemaha, Otoe | 39 min |
| Sep 23, 4:30 PM CDT | Severe Thunderstorm Warning | OAX | Johnson, Nemaha, Pawnee, Richardson | 45 min |
| Sep 23, 4:59 PM CDT | Severe Thunderstorm Warning | OAX | Nemaha, Otoe | 46 min |
| Sep 23, 5:15 PM CDT | Severe Thunderstorm Warning | OAX | Nemaha | 15 min |
| Sep 23, 5:42 PM CDT | Severe Thunderstorm Warning | OAX | Nemaha | 33 min |
| Sep 23, 6:18 PM CDT | Severe Thunderstorm Warning | OAX | Cass | 27 min |
| Sep 23, 4:01 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 15 min |
| Sep 23, 5:31 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 44 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2008Every severe thunderstorm warning in 2008
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.