Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Houston/Galveston, TX

January 6, 2021Houston County, Trinity County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Jan 6, 2021, 2:45 PM CST for Houston County, Trinity County, Texas. It was in force for 30 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
Jan 6, 2021, 2:45 PM CST (20:45 UTC)
Expired
Jan 6, 2021, 3:15 PM CST
In force
30 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Tornado
Possible
Hail
1.0 in
Wind
60.0 mph

Counties Houston County, TX, Trinity County, TX

The radar

The Houston radar (KHGX), 188 km from the middle of the area, began a volume at 20:47 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.

IssuedProductOfficeLasted
Jan 6, 12:59 PM CSTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.8 hours before the alert went out and 219 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-pSkew-T log-p diagram, Shreveport, LA at 12:00Z on 2021-01-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 12:00Z on 2021-01-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 233 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1879 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
233 m²/s²
0-3 km storm-relative helicity
214 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

179 
WUUS54 KHGX 062045
SVRHGX
TXC225-455-062115-
/O.NEW.KHGX.SV.W.0008.210106T2045Z-210106T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Houston/Galveston TX
245 PM CST Wed Jan 6 2021

The National Weather Service in League City has issued a

* Severe Thunderstorm Warning for...
  West central Trinity County in southeastern Texas...
  South central Houston County in southeastern Texas...

* Until 315 PM CST.

* At 243 PM CST, a severe thunderstorm was located over Lovelady, or
  11 miles east of Austonio, moving east at 25 to 30 mph.

  HAZARD...Quarter to half dollar size hail. Winds in excess of 40 
           mph will also be possible with this storm.  

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Lovelady.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3107 9553 3117 9555 3128 9531 3107 9525
TIME...MOT...LOC 2043Z 253DEG 24KT 3114 9544 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 6, 10:46 AM CSTSmall Craft AdvisoryHGX28 hr
Jan 6, 12:22 PM CSTSpecial Weather StatementHGXBrazos38 min
Jan 6, 12:48 PM CSTSevere Thunderstorm WarningHGXBrazos, Madison42 min
Jan 6, 1:14 PM CSTSevere Thunderstorm WarningHGXHouston, Madison46 min
Jan 6, 1:23 PM CSTSevere Thunderstorm WarningHGXBurleson37 min
Jan 6, 1:51 PM CSTSevere Thunderstorm WarningHGXHouston, Madison24 min
Jan 6, 1:57 PM CSTSevere Thunderstorm WarningHGXBrazos, Burleson33 min
Jan 6, 2:14 PM CSTSevere Thunderstorm WarningHGXHouston, Madison31 min
Jan 6, 2:23 PM CSTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes37 min
Jan 6, 2:35 PM CSTSpecial Weather StatementHGXColorado40 min
Jan 6, 2:55 PM CSTSevere Thunderstorm WarningHGXGrimes, Montgomery, Walker35 min
Jan 6, 2:56 PM CSTSpecial Weather StatementHGXWashington49 min
Jan 6, 3:09 PM CSTSevere Thunderstorm WarningHGXHouston, Trinity36 min
Jan 6, 3:18 PM CSTSevere Thunderstorm WarningHGXAustin, Grimes, Harris, Montgomery, Polk, San Jacinto and 3 more42 min
Jan 6, 3:44 PM CSTSpecial Weather StatementHGXTrinity16 min
Jan 6, 3:53 PM CSTSpecial Weather StatementHGXWharton52 min
Jan 6, 3:58 PM CSTSevere Thunderstorm WarningHGXLiberty, Montgomery, Polk, San Jacinto, Walker47 min
Jan 6, 4:20 PM CSTSevere Thunderstorm WarningHGXFort Bend, Wharton40 min
Jan 6, 4:26 PM CSTSpecial Weather StatementHGXFort Bend, Harris, Liberty64 min
Jan 6, 4:41 PM CSTSpecial Weather StatementHGXPolk49 min
Jan 6, 4:54 PM CSTAreal Flood AdvisoryHGXHarris51 min
Jan 6, 4:56 PM CSTSevere Thunderstorm WarningHGXBrazoria, Fort Bend34 min
Jan 6, 5:23 PM CSTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Harris22 min
Jan 6, 5:23 PM CSTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Harris37 min
Jan 6, 5:30 PM CSTSpecial Marine WarningHGX2 hr
Jan 6, 5:43 PM CSTSpecial Weather StatementHGXBrazoria, Chambers, Galveston47 min

Nearby

Severe Thunderstorm Warnings in Texas, 2021Every severe thunderstorm warning in 2021

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.