Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 671, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 19, 2009, 9:05 PM CDT for 4 counties in Oklahoma. It was in force for 55 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
- Aug 19, 2009, 9:05 PM CDT (02:05 UTC)
- Expired
- Aug 19, 2009, 10:00 PM CDT
- In force
- 55 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
Counties Harper County, OK, Major County, OK, Woods County, OK, Woodward County, OK
The radar
The Vance AFB radar (KVNX), 87 km from the middle of the area, began a volume at 02:05 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 19, 4:02 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Lamont, OK (KLMN), launched 00:00Z, 2.1 hours before the alert went out and 143 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
- 4299 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 854 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 277 m²/s²
- 0-3 km storm-relative helicity
- 480 m²/s²
- Significant tornado parameter
- 11.7
- Supercell composite
- 52.2
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 8:17 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Harper, Woods, Woodward | 58 min |
| Aug 19, 9:54 PM CDT | Severe Thunderstorm Warning | OUN | Dewey, Major, Woodward | 25 min |
| Aug 20, 12:00 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Logan, Payne | 60 min |
| Aug 20, 3:15 AM CDT | Severe Thunderstorm Warning | OUN | Ellis, Woodward | 60 min |
| Aug 20, 3:59 AM CDT | Severe Thunderstorm Warning | OUN | Woodward | 61 min |
| Aug 20, 4:56 AM CDT | Severe Thunderstorm Warning | OUN | Dewey | 34 min |
| Aug 20, 5:06 AM CDT | Severe Thunderstorm Warning | OUN | Major | 39 min |
| Aug 20, 5:14 AM CDT | Severe Thunderstorm Warning | OUN | Blaine | 46 min |
| Aug 20, 5:51 AM CDT | Severe Thunderstorm Warning | OUN | Kingfisher | 54 min |
| Aug 20, 2:42 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Johnston, Marshall | 48 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2009Every severe thunderstorm warning in 2009
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.