Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 429, NWS Tulsa, OK

August 12, 1999Rogers County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 12, 1999, 9:08 PM CDT for Rogers County, Oklahoma. It was in force for 37 min. 2 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
Aug 12, 1999, 9:08 PM CDT (02:08 UTC)
Expired
Aug 12, 1999, 9:45 PM CDT
In force
37 min
Issued by
NWS Tulsa, OK
Area
Whole counties

County Rogers County, OK

The radar

The Tulsa radar (KINX), 22 km from the middle of the area, began a volume at 02:09 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

TimeReportWhereRemark
Aug 12, 9:10 PM CDTThunderstorm WindFoyil, OKNumerous trees were uprooted or blown down. Several trees were blown over onto power lines. Tree limbs were blown into roads. At the Washington Cemetery, grave markers were blown over and large trees were uprooted.
Aug 12, 9:15 PM CDTThunderstorm Wind 52Bushyhead, OKLocation: Chelsea

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

Springfield, MO (KSGF), launched 00:00Z, 2.1 hours before the alert went out and 171 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, Springfield, MO at 00:00Z on 1999-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 525 joules per kilogram.LCLEL10008507005003002001001 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, Springfield, MO at 00:00Z on 1999-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.193958Sfc1 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
525 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
2869 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
33 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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.

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 Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 8:05 PM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, Aug 12, 8:05 PM CDT, 1 hour 3 minutes before
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In the hours before

Special weather statement, Aug 12, 4:15 PM CDT, 4 hours 53 minutes before
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Special weather statement, Aug 12, 4:15 PM CDT, 4 hours 53 minutes before
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Local storm report, Aug 12, 5:45 PM CDT, 3 hours 23 minutes before
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Local storm report, Aug 12, 5:45 PM CDT, 3 hours 23 minutes before
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Local storm report, Aug 12, 8:19 PM CDT, 49 minutes before
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Local storm report, Aug 12, 8:19 PM CDT, 49 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 7:01 PM CDTSevere Thunderstorm WarningTSARogers44 min
Aug 12, 7:39 PM CDTSevere Thunderstorm WarningTSAMayes51 min
Aug 13, 4:21 PM CDTSevere Thunderstorm WarningTSAPushmataha39 min
Aug 13, 4:44 PM CDTSevere Thunderstorm WarningTSAChoctaw61 min
Aug 13, 4:52 PM CDTSevere Thunderstorm WarningTSAPushmataha53 min
Aug 13, 5:39 PM CDTSevere Thunderstorm WarningTSAChoctaw, Pushmataha51 min
Aug 13, 6:26 PM CDTSevere Thunderstorm WarningTSAChoctaw19 min

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; radar from the NEXRAD Level II archive.