Alert archive / Texas / Tornado Warnings in 2012
Tornado Warning 25, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this tornado warning at Mar 20, 2012, 8:17 AM CDT for Brazoria County, Texas. It was in force for 23 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Mar 20, 2012, 8:17 AM CDT (13:17 UTC)
- Expired
- Mar 20, 2012, 8:40 AM CDT
- In force
- 23 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
County Brazoria County, TX
The radar
The Houston radar (KHGX), 24 km from the middle of the area, began a volume at 13:18 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 |
|---|---|---|---|
| Mar 20, 8:22 AM CDT | TSTM WND DMG | 4 Wsw Pearland, TX | SHINGLES BLOWN OFF A ROOF AND A FENCE BLOWN DOWN SOUTH FORK SUBDIVISION. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 20, 12:48 AM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 1.3 hours before the alert went out and 215 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
- 1368 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 555 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 225 m²/s²
- 0-3 km storm-relative helicity
- 338 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 8.8
The text
As transmitted, in the capitals the NWS used until 2016.
022
WFUS54 KHGX 201317
TORHGX
TXC039-201400-
/O.NEW.KHGX.TO.W.0025.120320T1317Z-120320T1400Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
817 AM CDT TUE MAR 20 2012
THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A
* TORNADO WARNING FOR...
NORTHERN BRAZORIA COUNTY IN SOUTHEAST TEXAS...
* UNTIL 900 AM CDT
* AT 816 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
TORNADO WAS LOCATED NEAR MANVEL...MOVING EAST AT 25 MPH.
* LOCATIONS IN THE TORNADO WARNING INCLUDE BUT ARE NOT LIMITED TO
PEARLAND AND IOWA COLONY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 AM CDT FOR THE
WARNED AREA.
&&
PLEASE REPORT SEVERE WEATHER TO THE COUNTY SHERIFF...LOCAL POLICE...
OR DEPARTMENT OF PUBLIC SAFETY AND ASK THEM TO RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE.
LAT...LON 2951 9523 2942 9543 2954 9542 2958 9540
2959 9533 2954 9522
TIME...MOT...LOC 1317Z 263DEG 22KT 2952 9540
$$1 follow-up statement
318
WWUS54 KHGX 201340
SVSHGX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
840 AM CDT TUE MAR 20 2012
TXC039-201350-
/O.CAN.KHGX.TO.W.0025.000000T0000Z-120320T1400Z/
BRAZORIA TX-
840 AM CDT TUE MAR 20 2012
...THE TORNADO WARNING FOR BRAZORIA COUNTY IS CANCELLED...
THE STORM THAT PROMPTED THE WARNING HAS WEAKENED OR MOVED OUT OF THE
AREA.
A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 AM CDT.
PLEASE REPORT SEVERE WEATHER TO THE COUNTY SHERIFF...LOCAL POLICE...
OR DEPARTMENT OF PUBLIC SAFETY AND ASK THEM TO RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE.
LAT...LON 2951 9523 2942 9543 2954 9542 2958 9540
2959 9533 2954 9522
TIME...MOT...LOC 1340Z 263DEG 22KT 2954 9524
$$The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 20, 2:24 AM CDT | Special Weather Statement | HGX | Brazos, Burleson, Washington | 51 min |
| Mar 20, 3:29 AM CDT | Special Weather Statement | HGX | Brazos, Burleson, Madison, Washington | 61 min |
| Mar 20, 3:48 AM CDT | Special Weather Statement | HGX | Brazos, Burleson, Madison, Washington | 42 min |
| Mar 20, 3:59 AM CDT | Areal Flood Advisory | HGX | Brazos, Burleson | 2 hr |
| Mar 20, 4:59 AM CDT | Areal Flood Advisory | HGX | Austin, Brazos, Burleson, Colorado, Grimes, Madison and 1 more | 2 hr |
| Mar 20, 5:25 AM CDT | Special Weather Statement | HGX | Austin, Colorado | 65 min |
| Mar 20, 5:38 AM CDT | Severe Thunderstorm Warning | HGX | Austin, Colorado, Waller, Washington, Wharton | 52 min |
| Mar 20, 5:53 AM CDT | Special Marine Warning | HGX | 112 min | |
| Mar 20, 6:39 AM CDT | Special Weather Statement | HGX | Montgomery, Waller | 66 min |
| Mar 20, 7:32 AM CDT | Special Weather Statement | HGX | Fort Bend | 58 min |
| Mar 20, 7:44 AM CDT | Special Marine Warning | HGX | 2 hr | |
| Mar 20, 7:45 AM CDT | Tornado Warning | HGX | Harris | 30 min |
| Mar 20, 7:49 AM CDT | Areal Flood Advisory | HGX | Harris, Montgomery | 3 hr |
| Mar 20, 7:59 AM CDT | Areal Flood Advisory | HGX | Austin, Burleson, Washington | 61 min |
| Mar 20, 8:08 AM CDT | Coastal Flood Statement | HGX | Brazoria, Chambers, Galveston, Harris, Matagorda | 7 hr |
| Mar 20, 8:34 AM CDT | Special Weather Statement | HGX | Harris | 56 min |
| Mar 20, 8:41 AM CDT | Special Marine Warning | HGX | 94 min | |
| Mar 20, 9:02 AM CDT | River Flood Warning | HGX | Brazos, Grimes, Madison | 5 days |
| Mar 20, 9:02 AM CDT | River Flood Warning | HGX | Burleson, Lee | 48 hr |
| Mar 20, 9:02 AM CDT | River Flood Warning | HGX | Burleson, Lee | 4 days |
| Mar 20, 9:18 AM CDT | Special Weather Statement | HGX | Liberty | 57 min |
| Mar 20, 9:21 AM CDT | River Flood Warning | HGX | Montgomery | 60 hr |
| Mar 20, 9:21 AM CDT | River Flood Warning | HGX | Harris, Liberty | 6 days |
| Mar 20, 9:29 AM CDT | River Flood Warning | HGX | Austin, Fort Bend, Wharton | 4 days |
| Mar 20, 9:29 AM CDT | River Flood Warning | HGX | Brazoria, Fort Bend, Wharton | 22 hr |
| Mar 20, 9:32 AM CDT | Special Weather Statement | HGX | Chambers, Galveston | 43 min |
| Mar 20, 10:02 AM CDT | Special Marine Warning | HGX | 88 min | |
| Mar 20, 10:13 AM CDT | Areal Flood Advisory | HGX | Brazoria, Chambers, Galveston | 62 min |
| Mar 20, 11:27 AM CDT | Special Marine Warning | HGX | 93 min |
Nearby
Tornado Warnings in Texas, 2012Every tornado warning in 2012Tornadoes in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.