Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 40, NWS Fort Worth, TX

January 29, 1999Collin County, Grayson County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Jan 29, 1999, 8:42 PM CST for Collin County, Grayson County, Texas. It was in force for 48 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: Jan 29, 1999, 8:42 PM CST (02:42 UTC)
Expired: Jan 29, 1999, 9:30 PM CST
In force: 48 min
Issued by: NWS Fort Worth, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Collin County, TX, Grayson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 112 km from the middle of the area, began a volume at 02:42 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.

What was reported inside it

Time	Report	Where	Remark
Jan 29, 9:00 PM CST	Hail 1.75	Tom Bean, TX

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

Fort Worth, TX (KFWD), launched 00:00Z, 2.7 hours before the alert went out and 89 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: 503 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 310 m²/s²
0-3 km storm-relative helicity: 495 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.

In the hours before

Local storm report, Jan 29, 4:28 PM CST, 4 hours 14 minutes before

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Local storm report, Jan 29, 4:45 PM CST, 3 hours 57 minutes before

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Local storm report, Jan 29, 4:49 PM CST, 3 hours 53 minutes before

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Local storm report, Jan 29, 4:53 PM CST, 3 hours 49 minutes before

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Local storm report, Jan 29, 5:23 PM CST, 3 hours 19 minutes before

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Local storm report, Jan 29, 5:31 PM CST, 3 hours 11 minutes before

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The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 29, 6:03 PM CST	Flash Flood Warning	FWD	Hunt, Kaufman	3 hr
Jan 29, 6:45 PM CST	Flash Flood Warning	FWD	Anderson	3 hr
Jan 29, 6:53 PM CST	Severe Thunderstorm Warning	FWD	Anderson, Henderson	52 min
Jan 29, 8:52 PM CST	Flash Flood Warning	FWD	Hunt	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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.