Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 95, NWS Houston/Galveston, TX

December 27, 2018Houston County, Madison County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Dec 27, 2018, 12:38 AM CST for Houston County, Madison County, Texas. It was in force for 52 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: Dec 27, 2018, 12:38 AM CST (06:38 UTC)
Expired: Dec 27, 2018, 1:30 AM CST
In force: 52 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Houston County, TX, Madison County, TX

The radar

The Ft Hood radar (KGRK), 169 km from the middle of the area, began a volume at 06:41 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
Dec 26, 9:34 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 6.6 hours before the alert went out and 235 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 836 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 280 m²/s²
0-3 km storm-relative helicity: 510 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Dec 26, 11:37 PM CST, 1 hour 1 minute earlier.

Area forecast discussion, Dec 26, 11:37 PM CST, 1 hour 1 minute before

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Hazardous weather outlook, Dec 26, 3:26 PM CST, 9 hours 12 minutes before

Hazardous Weather Outlook
National Weather Service Houston/Galveston TX
326 PM CST Wed Dec 26 2018

TXZ163-164-176>179-195>200-210>214-226-227-235>238-300-313-
335>338-436>438-272130-
Austin-Brazoria Islands-Brazos-Burleson-Chambers-Coastal Brazoria-
Coastal Galveston-Coastal Harris-Coastal Jackson-
Coastal Matagorda-Colorado-Fort Bend-
Galveston Island and Bolivar Peninsula-Grimes-Houston-
Inland Brazoria-Inland Galveston-Inland Harris-Inland Jackson-
Inland Matagorda-Madison-Matagorda Islands-Montgomery-
Northern Liberty-Polk-San Jacinto-Southern Liberty-Trinity-Walker-
Waller-Washington-Wharton-
326 PM CST Wed Dec 26 2018

This hazardous weather outlook is for portions of Southeast Texas..

.DAY ONE...This Afternoon and Tonight

There is an enhanced risk of severe thunderstorms tonight into
Thursday morning for southeast Texas. The main threats are
damaging winds and isolated tornadoes and locally heavy rainfall.
1 to 3 inches of rainfall is expected generally northeast of a
Freeport to Columbus line.

A coastal flood advisory is in effect for the Bolivar Peninsula
tonight with water levels increasing 1-2 feet above normal with
added waves.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed Wednesday afternoon through
Thursday morning.

GMZ330-335-350-355-370-375-272130-
Coastal waters from Freeport to Matagorda Ship Channel TX out
20 NM-Coastal waters from High Island to Freeport TX out 20 NM-
Galveston Bay-Matagorda Bay-
Waters from Freeport to Matagorda Ship Channel TX from 20 to
60 NM-Waters from High Island to Freeport TX from 20 to 60 NM-
326 PM CST Wed Dec 26 2018

This hazardous weather outlook is for portions of Southeast Texas..

.DAY ONE...This Afternoon and Tonight

A small craft advisory is in effect offshore through noon Thursday
due to strong onshore flow and elevated seas.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Winds and seas are expected to remain elevated early on Thursday,
and slowly diminish through the day. Winds and waves are expected
to increase again this weekend.

In the hours before

Special weather statement, Dec 26, 9:10 PM CST, 3 hours 28 minutes before

Special Weather Statement
National Weather Service Houston/Galveston TX
910 PM CST WED DEC 26 2018

TXZ163-270345-
Houston TX-
910 PM CST WED DEC 26 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN HOUSTON COUNTY UNTIL
945 PM CST...

At 909 PM CST, Doppler radar was tracking a strong thunderstorm near
Austonio, moving north at 55 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Crockett, Austonio, Grapeland and Latexo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3116 9554 3119 9574 3122 9574 3123 9573
      3127 9573 3130 9570 3129 9568 3132 9567
      3132 9566 3134 9566 3135 9568 3136 9566
      3137 9569 3142 9571 3152 9569 3153 9565
      3154 9565 3158 9534
TIME...MOT...LOC 0309Z 191DEG 47KT 3126 9562

Special weather statement, Dec 26, 9:37 PM CST, 3 hours 1 minute before

Special Weather Statement
National Weather Service Houston/Galveston TX
937 PM CST WED DEC 26 2018

TXZ163-164-178-179-270415-
San Jacinto TX-Polk TX-Houston TX-Trinity TX-
937 PM CST WED DEC 26 2018

...SIGNIFICANT WEATHER ADVISORY FOR TRINITY...NORTHERN SAN JACINTO...
NORTHEASTERN HOUSTON AND NORTHWESTERN POLK COUNTIES UNTIL 1015 PM
CST...

At 936 PM CST, Doppler radar was tracking a strong thunderstorm near
Sebastopol, or 21 miles southwest of Apple Springs, moving north at
60 mph.

Dime size hail will be possible with this storm.

Locations impacted include...
Apple Springs, Groveton, Sebastopol and Centralia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

A Tornado Watch remains in effect until 400 AM CST for southeastern
Texas.

LAT...LON 3150 9509 3149 9511 3147 9510 3146 9507
      3147 9506 3144 9504 3144 9501 3142 9500
      3141 9498 3141 9497 3138 9495 3138 9496
      3134 9496 3133 9490 3130 9489 3129 9488
      3085 9510 3091 9530 3152 9511
TIME...MOT...LOC 0336Z 199DEG 58KT 3097 9517

Local storm report, Dec 26, 10:01 PM CST, 2 hours 37 minutes before

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Special weather statement, Dec 27, 12:35 AM CST, 3 minutes before

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Local storm report, Dec 27, 12:38 AM CST, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1238 AM CST THU DEC 27 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1220 AM     TSTM WND DMG     EDGE                    30.89N  96.30W
12/27/2018                   BRAZOS             TX   LAW ENFORCEMENT

            TREES DOWNED ON FM974 AND EDGE CUTOFF ROAD

&&

EVENT NUMBER HGX1800255

DR

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 26, 9:10 PM CST	Special Weather Statement	HGX	Houston	35 min
Dec 26, 9:37 PM CST	Special Weather Statement	HGX	Trinity	38 min
Dec 26, 9:55 PM CST	Severe Thunderstorm Warning	HGX	Houston, Trinity	35 min
Dec 27, 12:18 AM CST	Severe Thunderstorm Warning	HGX	Brazos, Grimes, Madison	27 min
Dec 27, 12:35 AM CST	Special Weather Statement	HGX	Brazos, Burleson, Grimes	40 min
Dec 27, 1:21 AM CST	Severe Thunderstorm Warning	HGX	Houston	39 min
Dec 27, 1:29 AM CST	Areal Flood Advisory	HGX	Brazos, Burleson, Grimes, Madison	2 hr
Dec 27, 1:30 AM CST	Special Weather Statement	HGX	Brazos	15 min
Dec 27, 1:47 AM CST	Special Weather Statement	HGX	Grimes	28 min
Dec 27, 2:03 AM CST	Special Weather Statement	HGX	Trinity	42 min
Dec 27, 2:35 AM CST	Areal Flood Advisory	HGX	Grimes, Houston, Madison, San Jacinto, Trinity, Walker	55 min
Dec 27, 2:37 AM CST	Areal Flood Advisory	HGX	Brazos, Burleson, Grimes, Waller, Washington	53 min
Dec 27, 3:28 AM CST	Areal Flood Advisory	HGX	Austin, Brazos, Burleson, Colorado, Grimes, Houston and 7 more	2 hr
Dec 27, 3:57 AM CST	Special Weather Statement	HGX	Harris	48 min
Dec 27, 4:32 AM CST	Tornado Warning	HGX	Harris, Montgomery	13 min
Dec 27, 4:39 AM CST	Severe Thunderstorm Warning	HGX	Harris	9 min
Dec 27, 4:57 AM CST	Areal Flood Advisory	HGX	Austin, Brazos, Colorado, Fort Bend, Grimes, Harris and 9 more	3 hr
Dec 27, 5:02 AM CST	Special Weather Statement	HGX	Harris	28 min
Dec 27, 5:03 AM CST	Special Marine Warning	HGX		87 min
Dec 27, 5:07 AM CST	Special Weather Statement	HGX	Chambers	23 min
Dec 27, 5:44 AM CST	Special Weather Statement	HGX	Galveston	31 min
Dec 27, 6:31 AM CST	Special Marine Warning	HGX		59 min
Dec 27, 6:50 AM CST	River Flood Warning	HGX	Harris, Waller	27 hr
Dec 27, 7:20 AM CST	River Flood Warning	HGX	Polk, San Jacinto, Trinity, Walker	30 days
Dec 27, 7:29 AM CST	River Flood Warning	HGX	Brazos, Grimes, Madison	12 days
Dec 27, 7:29 AM CST	River Flood Warning	HGX	Polk, San Jacinto	27 hr
Dec 27, 7:40 AM CST	River Flood Warning	HGX	Waller	21 days
Dec 27, 7:48 AM CST	Special Marine Warning	HGX		57 min
Dec 27, 7:51 AM CST	River Flood Warning	HGX	Burleson, Washington	26 hr
Dec 27, 7:51 AM CST	River Flood Warning	HGX	Burleson, Lee	4 days
Dec 27, 8:01 AM CST	River Flood Warning	HGX	Waller	36 hr
Dec 27, 8:27 AM CST	River Flood Warning	HGX	Montgomery	48 hr
Dec 27, 8:27 AM CST	River Flood Warning	HGX	Harris, Montgomery	3 days
Dec 27, 8:27 AM CST	River Flood Warning	HGX	Harris, Liberty, Montgomery	5 days
Dec 27, 8:27 AM CST	River Flood Warning	HGX	Montgomery	41 hr
Dec 27, 8:27 AM CST	River Flood Warning	HGX	Harris, Montgomery	6 hr
Dec 27, 8:27 AM CST	River Flood Warning	HGX	Harris, Waller	61 hr
Dec 27, 8:27 AM CST	River Flood Warning	HGX	Harris	40 hr
Dec 27, 8:27 AM CST	River Flood Warning	HGX	Harris, Montgomery	26 hr
Dec 27, 8:37 AM CST	River Flood Warning	HGX	Liberty	34 days
Dec 27, 8:37 AM CST	River Flood Warning	HGX	Chambers, Liberty	35 days
Dec 27, 8:37 AM CST	River Flood Warning	HGX	Madison, Walker	47 hr
Dec 27, 8:37 AM CST	River Flood Warning	HGX	Hardin, Liberty, Polk	3 days
Dec 27, 9:02 AM CST	Areal Flood Advisory	HGX	Brazoria, Galveston	118 min
Dec 27, 3:51 PM CST	Small Craft Advisory	HGX		6 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2018 Every severe thunderstorm warning in 2018

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.