Alert archive / Texas / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 137, NWS Houston/Galveston, TX

June 17, 1997Polk County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Jun 17, 1997, 6:14 AM CDT for Polk County, Texas. It was in force for 61 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: Jun 17, 1997, 6:14 AM CDT (11:14 UTC)
Expired: Jun 17, 1997, 7:15 AM CDT
In force: 61 min
Issued by: NWS Houston/Galveston, TX
Area: Whole counties

County Polk County, TX

The radar

The Houston radar (KHGX), 149 km from the middle of the area, began a volume at 11:15 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
Jun 17, 6:30 AM CDT	Thunderstorm Wind	Onalaska, TX	Trees blown down in Onalaska along HWY 190

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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 11.2 hours before the alert went out and 173 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: 3629 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 691 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.1

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 Houston/Galveston, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 17, 1:53 AM CDT, 4 hours 21 minutes earlier.

Area forecast discussion, Jun 17, 1:53 AM CDT, 4 hours 21 minutes before

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The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 17, 5:28 AM CDT	Severe Thunderstorm Warning	HGX	Madison	62 min
Jun 17, 5:38 AM CDT	Severe Thunderstorm Warning	HGX	Houston	22 min
Jun 17, 5:52 AM CDT	Severe Thunderstorm Warning	HGX	Trinity	68 min
Jun 17, 7:26 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Grimes, Waller, Washington	64 min
Jun 17, 7:46 AM CDT	Severe Thunderstorm Warning	HGX	Harris, Montgomery	59 min
Jun 17, 8:09 AM CDT	Severe Thunderstorm Warning	HGX	Polk	36 min
Jun 17, 8:43 AM CDT	Severe Thunderstorm Warning	HGX	Liberty, Montgomery, San Jacinto	62 min
Jun 17, 9:08 AM CDT	Severe Thunderstorm Warning	HGX	Burleson, Washington	67 min
Jun 17, 10:05 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Washington	55 min
Jun 17, 10:19 AM CDT	Severe Thunderstorm Warning	HGX	Montgomery, Waller	56 min
Jun 17, 10:46 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Colorado	59 min
Jun 17, 11:18 AM CDT	Severe Thunderstorm Warning	HGX	Harris	57 min
Jun 17, 11:24 AM CDT	Severe Thunderstorm Warning	HGX	Austin, Colorado	66 min
Jun 17, 11:52 AM CDT	Tornado Warning	HGX	Harris	68 min
Jun 17, 12:13 PM CDT	Tornado Warning	HGX	Chambers	62 min
Jun 17, 12:19 PM CDT	Severe Thunderstorm Warning	HGX	Galveston	56 min
Jun 17, 12:27 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria	63 min
Jun 17, 1:08 PM CDT	Severe Thunderstorm Warning	HGX	Chambers, Galveston	67 min
Jun 17, 6:24 PM CDT	Severe Thunderstorm Warning	HGX	Wharton	66 min

Nearby

Severe Thunderstorm Warnings in Texas, 1997 Every severe thunderstorm warning in 1997

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.