Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 673, NWS Norman, OK

August 20, 2009Lincoln County, Logan County, Payne County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 20, 2009, 12:00 AM CDT for Lincoln County, Logan County, Payne County, Oklahoma. It was in force for 60 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 20, 2009, 12:00 AM CDT (05:00 UTC)
Expired
Aug 20, 2009, 1:00 AM CDT
In force
60 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Lincoln County, OK, Logan County, OK, Payne County, OK

The radar

The Norman radar (KTLX), 65 km from the middle of the area, began a volume at 05:00 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

Norman, OK (KOUN), launched 00:00Z, 5.0 hours before the alert went out and 80 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.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2009-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2352 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2009-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 169 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2352 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
1894 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
169 m²/s²
0-3 km storm-relative helicity
358 m²/s²
Significant tornado parameter
0.3
Supercell composite
18.8

Open this sounding in Storm Lab

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 19, 8:17 PM CDTSevere Thunderstorm WarningOUNEllis, Harper, Woods, Woodward58 min
Aug 19, 9:05 PM CDTSevere Thunderstorm WarningOUNHarper, Major, Woods, Woodward55 min
Aug 19, 9:54 PM CDTSevere Thunderstorm WarningOUNDewey, Major, Woodward25 min
Aug 20, 3:15 AM CDTSevere Thunderstorm WarningOUNEllis, Woodward60 min
Aug 20, 3:59 AM CDTSevere Thunderstorm WarningOUNWoodward61 min
Aug 20, 4:56 AM CDTSevere Thunderstorm WarningOUNDewey34 min
Aug 20, 5:06 AM CDTSevere Thunderstorm WarningOUNMajor39 min
Aug 20, 5:14 AM CDTSevere Thunderstorm WarningOUNBlaine46 min
Aug 20, 5:51 AM CDTSevere Thunderstorm WarningOUNKingfisher54 min
Aug 20, 2:42 PM CDTSevere Thunderstorm WarningOUNCarter, Johnston, Marshall48 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.