Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 155, NWS Shreveport, LA

May 21, 1990Claiborne Parish, Union Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 21, 1990, 8:30 AM CDT for Claiborne Parish, Union Parish, Louisiana. It was in force for 90 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: May 21, 1990, 8:30 AM CDT (13:30 UTC)
Expired: May 21, 1990, 10:00 AM CDT
In force: 90 min
Issued by: NWS Shreveport, LA
Area: Whole counties

Counties Claiborne Parish, LA, Union Parish, LA

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
May 21, 9:15 AM CDT	Hail 1.75	Claiborne, LA
May 21, 9:22 AM CDT	Thunderstorm Wind 0	Union, LA
May 21, 10:08 AM CDT	Thunderstorm Wind 0	Union, LA

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

Jackson, MS (KJAN), launched 12:00Z, 1.5 hours before the alert went out and 251 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: 2059 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 558 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

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

Local storm report, May 21, 5:58 AM CDT, 2 hours 32 minutes before

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Special weather statement, May 21, 6:10 AM CDT, 2 hours 20 minutes before

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Special weather statement, May 21, 6:13 AM CDT, 2 hours 17 minutes before

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Special weather statement, May 21, 6:19 AM CDT, 2 hours 11 minutes before

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Special weather statement, May 21, 7:02 AM CDT, 1 hour 28 minutes before

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Special weather statement, May 21, 7:58 AM CDT, 32 minutes before

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The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 21, 8:30 AM CDT	Severe Thunderstorm Warning	SHV	East Carroll, Morehouse, West Carroll	90 min
May 21, 8:30 AM CDT	Severe Thunderstorm Warning	SHV	Webster	90 min
May 21, 9:47 AM CDT	Severe Thunderstorm Warning	SHV	Lincoln, Union	88 min
May 21, 11:33 AM CDT	Severe Thunderstorm Warning	SHV	Franklin, Tensas	87 min
May 21, 3:55 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Winn	50 min
May 21, 4:47 PM CDT	Severe Thunderstorm Warning	SHV	Jackson, Winn	73 min
May 21, 1:56 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Pike	64 min
May 21, 3:03 AM CDT	Flash Flood Warning	SHV	Pike	3 hr
May 21, 3:03 AM CDT	Severe Thunderstorm Warning	SHV	Pike	27 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 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.