Alert archive / Texas / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 23, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Mar 26, 2009, 3:11 PM CDT for Harris County, Texas. It was in force for 49 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 26, 2009, 3:11 PM CDT (20:11 UTC)
- Expired
- Mar 26, 2009, 4:00 PM CDT
- In force
- 49 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
County Harris County, TX
The radar
The Houston radar (KHGX), 52 km from the middle of the area, began a volume at 20:13 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 26, 12:57 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.2 hours before the alert went out and 213 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
- 605 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 734 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 136 m²/s²
- 0-3 km storm-relative helicity
- 195 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.3
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 26, 11:31 AM CDT, 3 hours 40 minutes earlier.
Area forecast discussion, Mar 26, 11:31 AM CDT, 3 hours 40 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 651 AM CDT THU MAR 26 2009 GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226- 227-235>238-271200- 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- 651 AM CDT THU MAR 26 2009 ...THERE IS THE SLIGHT RISK FOR SEVERE THUNDERSTORMS ACROSS SOUTHEASTERN TEXAS THIS AFTERNOON AND EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...TODAY AND THIS EVENING ANOTHER WESTERN UPPER LEVEL DISTURBANCE IS EXPECTED TO CROSS EASTERN TEXAS THIS AFTERNOON. THIS SHORT WAVE WILL BE MOVING OVER A NEAR-STATIONARY...OR WARM...FRONTAL BOUNDARY WITHIN A MOIST AND UNSTABLE ENVIRONMENT. THIS WILL GENERATE SCATTERED SHOWERS AND THUNDERSTORMS. THE AIR MASS IS FORECAST TO BECOME MORE UNSTABLE THAN YESTERDAY...OR NOT BE AS CAPPED AS IT HAS BEEN IN PREVIOUS DAYS. THE COMBINATION OF THIS STRONG INSTABILITY AND MODERATE LOW LEVEL WIND SHEAR WILL FAVOR THE POTENTIAL FOR ISOLATED SUPER CELLS...OR BOW ECHO SEGMENTS...THAT WILL ULTIMATELY PRODUCE LARGE HAIL TO SIZE OF QUARTERS ALONG WITH DAMAGING WINDS IN EXCESS OF 60 MPH. STORM OUTFLOW BOUNDARIES MAY INTERSECT AND PRODUCE ISOLATED TORNADOES...OR FURTHER ENHANCE DOWNSTREAM STORM DEVELOPMENT. .DAY TWO...FRIDAY A STRONG COLD FRONT WILL RAPIDLY TRAVEL ACROSS SOUTHEASTERN TEXAS THROUGH THE AFTERNOON HOURS...REACHING THE COAST AROUND SUNSET. THERE IS A SMALL WINDOW OF OPPORTUNITY DURING THE LATE AFTERNOON FOR THE QUICK DEVELOPMENT OF A FEW SEVERE STORMS RIGHT ALONG...OR AHEAD OF...THE MAIN FRONTAL BOUNDARY. .DAYS THREE THROUGH SEVEN...SATURDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE THIS AFTERNOON AND FRIDAY AFTERNOON.
In the hours before
Local storm report, Mar 26, 10:25 AM CDT, 4 hours 46 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 |
|---|---|---|---|---|
| Mar 25, 7:15 PM CDT | Severe Thunderstorm Warning | HGX | Brazos, Grimes, Washington | 30 min |
| Mar 25, 7:22 PM CDT | Severe Thunderstorm Warning | HGX | Polk, Trinity | 38 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, 3:38 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.