Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 271, NWS Tulsa, OK

May 21, 1999Wagoner County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 21, 1999, 3:25 AM CDT for Wagoner County, Oklahoma. It was in force for 50 min. 1 report 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 21, 1999, 3:25 AM CDT (08:25 UTC)
Expired: May 21, 1999, 4:15 AM CDT
In force: 50 min
Issued by: NWS Tulsa, OK
Area: Whole counties

County Wagoner County, OK

What was reported inside it

Time	Report	Where	Remark
May 21, 3:30 AM CDT	Thunderstorm Wind	Oneta, OK	Large tree branches were blown down.

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, 8.4 hours before the alert went out and 186 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1805 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 128 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.

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 May 20, 9:38 PM CDT, 5 hours 47 minutes earlier.

Area forecast discussion, May 20, 9:38 PM CDT, 5 hours 47 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 1:51 AM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	39 min
May 21, 2:31 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Pawnee	29 min
May 21, 2:56 AM CDT	Severe Thunderstorm Warning	TSA	Osage, Tulsa	49 min
May 21, 3:19 AM CDT	Severe Thunderstorm Warning	TSA	Rogers	41 min
May 21, 3:52 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Tulsa	53 min
May 21, 4:18 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Delaware	42 min
May 21, 4:35 AM CDT	Severe Thunderstorm Warning	TSA	Adair	25 min
May 21, 5:24 AM CDT	Flash Flood Warning	TSA	Wagoner	3 hr
May 21, 7:40 AM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	50 min
May 21, 8:01 AM CDT	Flash Flood Warning	TSA	LeFlore	3 hr
May 21, 5:07 AM CDT	Severe Thunderstorm Warning	TSA	Washington	53 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1999 Every 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.