Alert archive / Texas / Severe Thunderstorm Warnings in 2008
Severe Thunderstorm Warning 20, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Feb 15, 2008, 11:28 PM CST for Liberty County, Texas. It was in force for 32 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
- Feb 15, 2008, 11:28 PM CST (05:28 UTC)
- Expired
- Feb 16, 2008, 12:00 AM CST
- In force
- 32 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
County Liberty County, TX
The radar
The Houston radar (KHGX), 80 km from the middle of the area, began a volume at 05:31 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, 5.5 hours before the alert went out and 155 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.
- Mixed-layer CAPE
- 51 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 582 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Feb 15, 9:14 PM CST, 2 hours 14 minutes earlier.
Area forecast discussion, Feb 15, 9:14 PM CST, 2 hours 14 minutes before
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</html>Hazardous weather outlook, Feb 15, 4:17 PM CST, 7 hours 11 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 417 PM CST FRI FEB 15 2008 GMZ330-335-TXZ163-164-176>179-195>200-210>214-226-227-235>238- 161315- AUSTIN-BRAZORIA-BRAZOS-BURLESON-CHAMBERS-COLORADO-FORT BEND- GALVESTON-GALVESTON BAY-GRIMES-HARRIS-HOUSTON-JACKSON-LIBERTY- MADISON-MATAGORDA-MATAGORDA BAY-MONTGOMERY-POLK-SAN JACINTO- TRINITY-WALKER-WALLER-WASHINGTON-WHARTON- 417 PM CST FRI FEB 15 2008 ...SIGNIFICANT THREAT FOR SEVERE WEATHER ACROSS ALL OF SOUTHEAST TEXAS SATURDAY AND SATURDAY EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...TONIGHT SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS WILL PERSIST OVER SOUTHEAST TEXAS TONIGHT AS MOISTURE CONTINUES TO INCREASE IN ADVANCE OF AN APPROACHING UPPER LEVEL STORM SYSTEM. A FEW STRONGER STORMS ARE POSSIBLE AFTER 4 AM...WITH THE POTENTIAL FOR SMALL HAIL AND GUSTY WINDS. RAINFALL AMOUNTS TONIGHT WILL AVERAGE 1/4 TO 1/2 INCH WITH ISOLATED TOTALS TO AN INCH. OTHERWISE...HAZARDOUS WEATHER IS NOT EXPECTED. .DAY TWO...SATURDAY AND SATURDAY NIGHT AN APPROACHING UPPER LEVEL STORM SYSTEM WILL COMBINE WITH A VERY MOIST AND UNSTABLE AIRMASS TO PRODUCE NUMEROUS SHOWERS AND THUNDERSTORMS SATURDAY. STRONG SHEAR IN THE LOWER LEVELS OF THE ATMOSPHERE WILL SUPPORT THE DEVELOPMENT OF SUPERCELLS AND ISOLATED TORNADOES DURING THE LATE MORNING THROUGH EARLY EVENING HOURS SATURDAY. IN ADDITION TO TORNADOES...FREQUENT LIGHTNING... LARGE HAIL AND DAMAGING WINDS WILL ALSO BE POSSIBLE. A SQUALL LINE WILL DEVELOP OVER THE WESTERN COUNTIES OF SOUTHEAST TEXAS BEGINNING MID AFTERNOON SATURDAY...AND MOVE EAST ACROSS THE AREA DURING THE LATE AFTERNOON AND EVENING HOURS. SOME OF THESE STORMS COULD BECOME SEVERE PRODUCING DAMAGING WINDS...HAIL... FREQUENT LIGHTNING AND HEAVY RAINFALL. THROUGH SATURDAY EVENING...WIDESPREAD RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE EXPECTED...WITH ISOLATED TOTALS UP TO 4 INCHES POSSIBLE. LOCALIZED FLOODING OF STREETS...FEEDER ROADS...SECONDARY ROADS...AND LOW WATER CROSSINGS WILL BE POSSIBLE WITH THE STRONGEST STORMS. THE SEVERE WEATHER THREAT WILL BEGIN MID MORNING SATURDAY AND LAST WELL INTO THE EVENING HOURS. THE THREAT FOR SEVERE WEATHER WITH THIS EVENT WILL BE GREATER THAN THE AREA HAS SEEN DURING RECENT EVENTS. RESIDENTS OF SOUTHEAST TEXAS ARE ENOURAGED TO STAY ABREAST OF THE RAPIDLY CHANGING WEATHER CONDITIONS ON SATURDAY. MONITOR NOAA WEATHER RADIO...NEWS MEDIA...INTERNET...AND OTHER WEATHER INFORMATION SOURCES. BE PREPARED TO ACT QUICKLY IF SEVERE TORNADOES OR SEVERE THUNDERSTORMS THREATEN YOUR AREA. .DAYS THREE THROUGH SEVEN...SUNDAY THROUGH THURSDAY HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... EMERGENCY MANAGEMENT AND SPOTTER ACTIVATION ARE LIKELY SATURDAY.
In the hours before
Local storm report, Feb 15, 8:17 PM CST, 3 hours 11 minutes before
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</html>Local storm report, Feb 15, 10:46 PM CST, 42 minutes before
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</html>The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 15, 7:46 PM CST | Severe Thunderstorm Warning | HGX | Houston, Madison | 44 min |
| Feb 15, 9:08 PM CST | Severe Thunderstorm Warning | HGX | Brazos, Grimes, Washington | 37 min |
| Feb 15, 9:43 PM CST | Severe Thunderstorm Warning | HGX | Brazos, Grimes, Washington | 32 min |
| Feb 15, 10:14 PM CST | Severe Thunderstorm Warning | HGX | Harris | 31 min |
| Feb 15, 10:28 PM CST | Severe Thunderstorm Warning | HGX | Montgomery | 30 min |
| Feb 15, 11:23 PM CST | Severe Thunderstorm Warning | HGX | Houston, Madison, Walker | 14 min |
| Feb 16, 5:17 PM CST | Tornado Warning | HGX | 43 min | |
| Feb 16, 5:46 PM CST | Tornado Warning | HGX | Houston, Trinity, Walker | 44 min |
| Feb 16, 5:56 PM CST | Tornado Warning | HGX | Houston | 20 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2008Every severe thunderstorm warning in 2008
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.