Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 593, NWS Norman, OK

September 7, 1999Logan County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Sep 7, 1999, 7:29 PM CDT for Logan County, Oklahoma. It was in force for 46 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
Sep 7, 1999, 7:29 PM CDT (00:29 UTC)
Expired
Sep 7, 1999, 8:15 PM CDT
In force
46 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Logan County, OK

What was reported inside it

TimeReportWhereRemark
Sep 7, 7:40 PM CDTThunderstorm Wind 52Marshall, OK
Sep 7, 8:05 PM CDTThunderstorm Wind 63Marshall, OK
Sep 7, 8:10 PM CDTThunderstorm Wind 55Marshall, OK

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

Lamont, OK (KLMN), launched 00:00Z, 0.5 hours before the alert went out and 78 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, Lamont, OK at 00:00Z on 1999-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 658 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lamont, OK at 00:00Z on 1999-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 square meters per square second.1939Sfc1 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
658 J/kg
Mixed-layer CIN
-97 J/kg
Mixed-layer LCL
2024 m above ground
0-6 km bulk shear
1 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
4 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 7:37 PM CDTSevere Thunderstorm WarningOUNGarfield53 min
Sep 7, 8:18 PM CDTSevere Thunderstorm WarningOUNLogan42 min
Sep 7, 8:26 PM CDTSevere Thunderstorm WarningOUNGarfield39 min
Sep 7, 9:46 PM CDTSevere Thunderstorm WarningOUNLincoln29 min
Sep 7, 9:50 PM CDTSevere Thunderstorm WarningOUNGrant30 min
Sep 7, 10:15 PM CDTSevere Thunderstorm WarningOUNGrant45 min
Sep 7, 10:42 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant, Noble48 min
Sep 7, 11:09 PM CDTSevere Thunderstorm WarningOUNLogan51 min
Sep 8, 1:09 AM CDTFlash Flood WarningOUNGarfield, Logan4 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1999Every severe thunderstorm warning in 1999

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.