Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 293, NWS Norman, OK

May 29, 1990Harmon County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 29, 1990, 1:06 PM CDT for Harmon County, Oklahoma. It was in force for 39 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 29, 1990, 1:06 PM CDT (18:06 UTC)
Expired: May 29, 1990, 1:45 PM CDT
In force: 39 min
Issued by: NWS Norman, OK
Area: Whole counties

County Harmon County, OK

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
May 29, 1:10 PM CDT	Hail 0.75	Harmon, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 6.1 hours before the alert went out and 177 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: 797 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 255 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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.

In the hours before

Special weather statement, May 29, 12:21 PM CDT, 45 minutes before

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Special weather statement, May 29, 12:48 PM CDT, 18 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
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The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 1:19 PM CDT	Severe Thunderstorm Warning	OUN	Greer	56 min
May 29, 2:08 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Washita	52 min
May 29, 2:32 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	28 min
May 29, 2:45 PM CDT	Severe Thunderstorm Warning	OUN	Washita	60 min
May 29, 3:29 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	61 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1990 Every severe thunderstorm warning in 1990

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.