Alert archive / Texas / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 19, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Mar 25, 2009, 7:22 PM CDT for Polk County, Trinity County, Texas. It was in force for 38 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
- Mar 25, 2009, 7:22 PM CDT (00:22 UTC)
- Expired
- Mar 25, 2009, 8:00 PM CDT
- In force
- 38 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
Counties Polk County, TX, Trinity County, TX
The radar
The Houston radar (KHGX), 164 km from the middle of the area, began a volume at 00:23 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Mar 25, 2:06 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.4 hours before the alert went out and 194 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
- 3131 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 474 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 130 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 2.5
- Supercell composite
- 9.3
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 Mar 25, 7:10 PM CDT, 12 minutes earlier.
Area forecast discussion, Mar 25, 7:10 PM CDT, 12 minutes before
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</html>Hazardous weather outlook, Mar 25, 3:41 PM CDT, 3 hours 41 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 341 PM CDT WED MAR 25 2009 GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226- 227-235>238-261200- 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- WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL 20 NM TO 60 NM- WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL OUT 20 NM- WATERS FROM HIGH ISLAND TO FREEPORT 20 TO 60 NM- WATERS FROM HIGH ISLAND TO FREEPORT OUT 20 NM-WHARTON- 341 PM CDT WED MAR 25 2009 ...SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS ALL OF SOUTHEAST TEXAS THIS EVENING AND AGAIN THURSDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...REST OF THIS AFTERNOON AND TONIGHT A STALLED FRONT DRAPED WEST TO EAST ACROSS THE CENTRAL PORTIONS OF THE AREA WILL STALL AGAIN THIS EVENING ACROSS THE NORTHERN COUNTIES OF SOUTHEAST TEXAS. SCATTERED THUNDERSTORMS DEVELOPING OVER THE EDWARDS PLATEAU AND HILL COUNTRY ARE EXPECTED TO SPREAD EAST INTO THE AREA AFTER 6 PM AS AN UPPER LEVEL DISTURBANCE APPROACHES FROM THE WEST. THE BULK OF THE THUNDERSTORM ACTIVITY IS EXPECTED TO DEVELOP NORTH OF THE FRONT. THE POTENTIAL EXISTS FOR A FEW OF THESE STORMS TO BECOME SEVERE...WITH THE GREATEST SEVERE WEATHER POTENTIAL NORTH OF INTERSTATE 10. ANY STORMS THAT BECOME SEVERE WILL HAVE THE POTENTIAL TO PRODUCE LARGE HAIL...DAMAGING WINDS...AND ISOLATED TORNADOES. IN ADDITION...LOCALLY HEAVY RAINFALL WILL BE POSSIBLE. RAINFALL AMOUNTS WILL AVERAGE 1/2 TO 1 INCH WITH ISOLATED HIGHER TOTALS. SOUTH OF THE FRONT...LESS THUNDERSTORM COVERAGE IS EXPECTED DUE TO A CAPPING LAYER OF WARM AIR IN THE ATMOSPHERE. HOWEVER...ANY STORMS THAT MANAGE TO BREAK THE CAP SOUTH OF THE FRONT WILL ALSO HAVE THE POTENTIAL TO BECOME SEVERE. THE SEVERE WEATHER THREAT IS EXPECTED TO END BY MIDNIGHT AS THE UPPER LEVEL DISTURBANCE MOVES EAST OF THE AREA. .DAY TWO...THURSDAY AND THURSDAY NIGHT ANOTHER UPPER LEVEL DISTURBANCE IS EXPECTED TO CROSS SOUTHEAST TEXAS THURSDAY AFTERNOON. THIS DISTURBANCE WILL COMBINE WITH THE MOIST AND UNSTABLE AIRMASS IN PLACE TO GENERATE SCATTERED SHOWERS AND THUNDERSTORMS. THE AIRMASS IS EXPECTED TO BECOME STRONGLY UNSTABLE OVER THE AREA THURSDAY AFTERNOON...WITH CAPPING LESS OF AN ISSUE THAN TODAY. THE COMBINATION OF THE STRONG INSTABILITY AND LOW LEVEL SHEAR WILL FAVOR THE POTENTIAL FOR ISOLATED SUPERCELLS PRODUCING LARGE HAIL...DAMAGING WINDS...OR ISOLATED TORNADOES. .DAY THREE...FRIDAY THROUGH FRIDAY NIGHT A COLD FRONT WILL TREK ACROSS SOUTHEASTERN TEXAS THROUGH THE DAYTIME HOURS...REACHING THE COAST AROUND SUNSET. SCATTERED THUNDERSTORMS MAY DEVELOP AHEAD OF THE MAIN SURFACE FRONT...OR OVER THE EASTERN HALF OF SOUTHEAST TEXAS. THERE IS A SMALL WINDOW OF POSSIBILITY FOR A FEW SEVERE STORMS OVER THE EASTERN HALF OF SOUTHEAST TEXAS FROM MIDDAY THROUGH MID AFTERNOON FRIDAY. .DAYS FOUR THROUGH SEVEN...SATURDAY THROUGH TUESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE TODAY...THURSDAY...AND FRIDAY.
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 25, 7:15 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Grimes, Washington | 30 min |
| Mar 25, 7:40 PM CDT | Tornado Warning | HGX | Grimes, Montgomery, San Jacinto, Walker | 50 min |
| Mar 25, 8:10 PM CDT | Tornado Warning | HGX | Harris, Montgomery | 50 min |
| Mar 25, 8:25 PM CDT | Tornado Warning | HGX | Harris, Liberty, Montgomery, San Jacinto | 50 min |
| Mar 25, 9:05 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Liberty | 40 min |
| Mar 25, 10:01 PM CDT | Special Marine Warning | HGX | 59 min | |
| Mar 26, 1:36 PM CDT | Severe Thunderstorm Warning | HGX | Jackson, Wharton | 39 min |
| Mar 26, 1:54 PM CDT | Severe Thunderstorm Warning | HGX | Fort Bend | 51 min |
| Mar 26, 2:34 PM CDT | Areal Flood Advisory | HGX | Fort Bend, Harris | 116 min |
| Mar 26, 3:11 PM CDT | Severe Thunderstorm Warning | HGX | Harris | 49 min |
| Mar 26, 3:38 PM CDT | Areal Flood Advisory | HGX | Fort Bend, Harris, Montgomery | 112 min |
| Mar 26, 4:19 PM CDT | Special Marine Warning | HGX | 86 min | |
| Mar 26, 4:30 PM CDT | Special Marine Warning | HGX | 60 min | |
| Mar 26, 5:08 PM CDT | Special Marine Warning | HGX | 52 min | |
| Mar 26, 5:44 PM CDT | Special Marine Warning | HGX | 91 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2009Every severe thunderstorm warning in 2009
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.