Alert archive / Texas / Tornado Warnings in 2015
Tornado Warning 49, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this tornado warning at Dec 12, 2015, 4:37 PM CST for 4 counties in Texas. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Dec 12, 2015, 4:37 PM CST (22:37 UTC)
- Expired
- Dec 12, 2015, 5:00 PM CST
- In force
- 23 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.0 in
Counties Grimes County, TX, Harris County, TX, Montgomery County, TX, Waller County, TX
The radar
The Houston radar (KHGX), 102 km from the middle of the area, began a volume at 22:38 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 12:00Z, 10.6 hours before the alert went out and 243 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
- 351 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 540 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 204 m²/s²
- 0-3 km storm-relative helicity
- 295 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
The text
As transmitted, in the capitals the NWS used until 2016.
689
WFUS54 KHGX 122237
TORHGX
TXC185-201-339-473-122300-
/O.NEW.KHGX.TO.W.0049.151212T2237Z-151212T2300Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
437 PM CST SAT DEC 12 2015
THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A
* TORNADO WARNING FOR...
NORTHEASTERN WALLER COUNTY IN SOUTHEASTERN TEXAS...
SOUTHWESTERN MONTGOMERY COUNTY IN SOUTHEASTERN TEXAS...
SOUTHEASTERN GRIMES COUNTY IN SOUTHEASTERN TEXAS...
NORTHWESTERN HARRIS COUNTY IN SOUTHEASTERN TEXAS...
* UNTIL 500 PM CST
* AT 437 PM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
TORNADO WAS LOCATED NEAR STAGECOACH...OR 7 MILES SOUTHWEST OF
PINEHURST...MOVING NORTH AT 40 MPH.
HAZARD...TORNADO.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES.
* LOCATIONS IMPACTED INCLUDE...
PINEHURST...MAGNOLIA...MONTGOMERY...STAGECOACH...TODD MISSION...
LAKE CONROE DAM...DOBBIN AND DACUS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.
HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.
&&
LAT...LON 3000 9569 3004 9589 3049 9584 3043 9553
TIME...MOT...LOC 2237Z 192DEG 33KT 3010 9578
TORNADO...RADAR INDICATED
HAIL...0.00IN
$$
402 follow-up statements
097
WWUS54 KHGX 122244
SVSHGX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
444 PM CST SAT DEC 12 2015
TXC201-122253-
/O.CAN.KHGX.TO.W.0049.000000T0000Z-151212T2300Z/
HARRIS TX-
444 PM CST SAT DEC 12 2015
...THE TORNADO WARNING FOR NORTHWESTERN HARRIS COUNTY IS CANCELLED...
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT
OF THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 3010 9577 3013 9584 3048 9580 3043 9553
3012 9565
TIME...MOT...LOC 2243Z 192DEG 33KT 3016 9576
$$
TXC185-339-473-122300-
/O.CON.KHGX.TO.W.0049.000000T0000Z-151212T2300Z/
WALLER TX-MONTGOMERY TX-GRIMES TX-
444 PM CST SAT DEC 12 2015
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CST FOR
NORTHEASTERN WALLER...SOUTHWESTERN MONTGOMERY AND SOUTHEASTERN GRIMES
COUNTIES...
AT 443 PM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR MAGNOLIA...OR NEAR PINEHURST...MOVING NORTH AT 40
MPH.
HAZARD...TORNADO.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES.
LOCATIONS IMPACTED INCLUDE...
PINEHURST...MAGNOLIA...MONTGOMERY...STAGECOACH...TODD MISSION...LAKE
CONROE DAM...DOBBIN AND DACUS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.
HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.
&&
LAT...LON 3010 9577 3013 9584 3048 9580 3043 9553
3012 9565
TIME...MOT...LOC 2243Z 192DEG 33KT 3016 9576
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
40673
WWUS54 KHGX 122252
SVSHGX
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
452 PM CST SAT DEC 12 2015
TXC185-473-122301-
/O.CAN.KHGX.TO.W.0049.000000T0000Z-151212T2300Z/
WALLER TX-GRIMES TX-
452 PM CST SAT DEC 12 2015
...THE TORNADO WARNING FOR NORTHEASTERN WALLER AND SOUTHEASTERN
GRIMES COUNTIES IS CANCELLED...
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT
OF THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.
LAT...LON 3016 9580 3048 9580 3043 9554 3015 9570
TIME...MOT...LOC 2251Z 192DEG 33KT 3023 9574
$$
TXC339-122300-
/O.CON.KHGX.TO.W.0049.000000T0000Z-151212T2300Z/
MONTGOMERY TX-
452 PM CST SAT DEC 12 2015
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM CST FOR WEST
CENTRAL MONTGOMERY COUNTY...
AT 451 PM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER MAGNOLIA...OR NEAR PINEHURST...MOVING NORTH AT 40
MPH.
HAZARD...TORNADO.
SOURCE...RADAR INDICATED ROTATION.
IMPACT...EXPECT DAMAGE TO MOBILE HOMES...ROOFS AND VEHICLES.
LOCATIONS IMPACTED INCLUDE...
PINEHURST...MAGNOLIA...MONTGOMERY...STAGECOACH...DACUS AND DOBBIN.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.
HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.
&&
LAT...LON 3016 9580 3048 9580 3043 9554 3015 9570
TIME...MOT...LOC 2251Z 192DEG 33KT 3023 9574
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
40The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 12, 4:37 AM CST | Small Craft Advisory | HGX | 40 hr | |
| Dec 12, 10:17 AM CST | River Flood Warning | HGX | Liberty, Polk, San Jacinto | 68 hr |
| Dec 12, 12:15 PM CST | Special Weather Statement | HGX | Harris | 45 min |
| Dec 12, 3:02 PM CST | Wind Advisory | HGX | Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more | 18 hr |
| Dec 12, 3:17 PM CST | Special Weather Statement | HGX | Montgomery | 43 min |
| Dec 12, 4:07 PM CST | Special Weather Statement | HGX | Trinity | 38 min |
| Dec 12, 4:09 PM CST | Special Weather Statement | HGX | Waller | 51 min |
| Dec 12, 4:22 PM CST | Special Weather Statement | HGX | Montgomery | 38 min |
| Dec 12, 4:31 PM CST | Special Weather Statement | HGX | Walker | 29 min |
| Dec 12, 4:49 PM CST | Tornado Warning | HGX | Harris | 26 min |
| Dec 12, 5:01 PM CST | Tornado Warning | HGX | Montgomery, Walker | 29 min |
| Dec 12, 5:05 PM CST | Special Weather Statement | HGX | Montgomery | 25 min |
| Dec 12, 5:18 PM CST | Special Weather Statement | HGX | Montgomery | 27 min |
| Dec 12, 5:30 PM CST | Special Weather Statement | HGX | Walker | 45 min |
| Dec 12, 5:36 PM CST | Special Weather Statement | HGX | Brazos | 24 min |
Nearby
Tornado Warnings in Texas, 2015Every tornado warning in 2015Tornadoes in 2015
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.