Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 12, NWS Lake Charles, LA

January 30, 1999Jefferson County, Texas

NWS Lake Charles, LA issued this severe thunderstorm warning at Jan 30, 1999, 12:40 AM CST for Jefferson County, Texas. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jan 30, 1999, 12:40 AM CST (06:40 UTC)
Expired: Jan 30, 1999, 1:40 AM CST
In force: 60 min
Issued by: NWS Lake Charles, LA
Area: Whole counties

County Jefferson County, TX

The radar

The Lake Charles radar (KLCH), 95 km from the middle of the area, began a volume at 06:42 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.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 6.7 hours before the alert went out and 96 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: 1341 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 535 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 184 m²/s²
0-3 km storm-relative helicity: 192 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 5.8

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 Lake Charles, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jan 29, 7:20 PM CST, 5 hours 20 minutes earlier.

Area forecast discussion, Jan 29, 7:20 PM CST, 5 hours 20 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 29, 6:07 PM CST	Flash Flood Warning	LCH	Avoyelles, Rapides	118 min
Jan 30, 6:35 AM CST	Flash Flood Warning	LCH	Avoyelles, Rapides	3 hr

Nearby

Severe Thunderstorm Warnings in Texas, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.