Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 355, NWS Norman, OK

May 22, 1999Payne County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 22, 1999, 5:49 PM CDT for Payne County, Oklahoma. It was in force for 26 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
May 22, 1999, 5:49 PM CDT (22:49 UTC)
Expired
May 22, 1999, 6:15 PM CDT
In force
26 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Payne County, OK

The radar

The Norman radar (KTLX), 87 km from the middle of the area, began a volume at 22:50 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
May 22, 5:55 PM CDTHail 0.75Glencoe, OK
May 22, 6:25 PM CDTHail 1.25Yale, 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

Norman, OK (KOUN), launched 12:00Z, 10.8 hours before the alert went out and 103 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 12:00Z on 1999-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1999 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 12:00Z on 1999-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 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
1999 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
912 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
96 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
May 22, 5:21 AM CDTSevere Thunderstorm WarningOUNHarper39 min
May 22, 12:40 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Woods35 min
May 22, 1:15 PM CDTSevere Thunderstorm WarningOUNKay30 min
May 22, 3:34 PM CDTSevere Thunderstorm WarningOUNNoble41 min
May 22, 4:15 PM CDTSevere Thunderstorm WarningOUNNoble45 min
May 22, 4:33 PM CDTSevere Thunderstorm WarningOUNKay42 min
May 22, 4:57 PM CDTSevere Thunderstorm WarningOUNNoble48 min
May 22, 5:17 PM CDTFlash Flood WarningOUNKay3 hr
May 22, 6:14 PM CDTSevere Thunderstorm WarningOUNPayne61 min
May 22, 6:51 PM CDTSevere Thunderstorm WarningOUNLincoln39 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.