Alert archive / Texas / Tornado Warnings in 2021

Tornado Warning 28, NWS Houston/Galveston, TX

October 27, 2021Harris County, Liberty County, Montgomery County, Texas

NWS Houston/Galveston, TX issued this tornado warning at Oct 27, 2021, 8:48 AM CDT for Harris County, Liberty County, Montgomery County, Texas. It was in force for 27 min. 3 reports 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
Oct 27, 2021, 8:48 AM CDT (13:48 UTC)
Expired
Oct 27, 2021, 9:15 AM CDT
In force
27 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Harris County, TX, Liberty County, TX, Montgomery County, TX

The radar

The Houston radar (KHGX), 68 km from the middle of the area, began a volume at 13:49 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

TimeReportWhereRemark
Oct 27, 8:50 AM CDTTORNADO3 Sw Porter Heights, TXA BRIEF TORNADO WAS OBSERVED NEAR GRAND OAKS HIGH SCHOOL IN SPRING. BASED ON VIDEO APPEARED TO BRIEFLY TOUCH DOWN IN A FIELD. ONLY DAMAGE EVIDENT A SOCCER GOAL WAS FLIPPED OVER. VERY SHORT LIVED. TORNADO RATED EF0.
Oct 27, 8:50 AM CDTTORNADO3 Sw Porter Heights, TXCORRECTS PREVIOUS TORNADO REPORT FROM 3 SW PORTER HEIGHTS. A BRIEF TORNADO WAS OBSERVED NEAR GRAND OAKS HIGH SCHOOL IN SPRING. BASED ON VIDEO APPEARED TO BRIEFLY TOUCH DOWN IN A FIELD. ONLY DAMAGE EVIDENT A SOCCER GOAL WAS FLIPPED OVER. VERY SHORT LIVED. TORNA
Oct 27, 8:50 AM CDTTORNADO3 Sw Porter Heights, TXA TORNADO WAS OBSERVED NEAR GRAND OAKS HIGH SCHOOL IN SPRING. RATING IS SUBJECT TO CHANGE AS WE GATHER ADDITIONAL INFORMATION.

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.

IssuedProductOfficeLasted
Oct 27, 7:55 AM CDTTornado WatchSPC9 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 1.8 hours before the alert went out and 189 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, Lake Charles Mun, LA at 12:00Z on 2021-10-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1422 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2021-10-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.193958Sfc1 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
1422 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
604 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
255 m²/s²
Significant tornado parameter
1.1
Supercell composite
7.1

Open this sounding in Storm Lab

The text

As transmitted.

785 
WFUS54 KHGX 271348
TORHGX
TXC201-291-339-271415-
/O.NEW.KHGX.TO.W.0028.211027T1348Z-211027T1415Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Houston/Galveston TX
848 AM CDT Wed Oct 27 2021

The National Weather Service in League City has issued a

* Tornado Warning for...
  Southeastern Montgomery County in southeastern Texas...
  Western Liberty County in southeastern Texas...
  Northeastern Harris County in southeastern Texas...

* Until 915 AM CDT.
    
* At 847 AM CDT, a severe thunderstorm capable of producing a tornado
  was located over Porter Heights, or near Spring, moving east at 35
  mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Kingwood around 905 AM CDT.
  Lake Houston around 910 AM CDT.

Other locations impacted by this tornadic thunderstorm include Porter
and New Caney.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 2998 9505 3011 9537 3016 9536 3017 9501
TIME...MOT...LOC 1347Z 285DEG 32KT 3012 9532 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$
Cady
1 follow-up statement
345 
WWUS54 KHGX 271407
SVSHGX

Severe Weather Statement
National Weather Service Houston/Galveston TX
907 AM CDT Wed Oct 27 2021

TXC201-291-339-271417-
/O.EXP.KHGX.TO.W.0028.000000T0000Z-211027T1415Z/
Montgomery TX-Liberty TX-Harris TX-
907 AM CDT Wed Oct 27 2021

...THE TORNADO WARNING FOR SOUTHEASTERN MONTGOMERY...WESTERN LIBERTY
AND NORTHEASTERN HARRIS COUNTIES WILL EXPIRE AT 915 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A Tornado Watch remains in effect until 400 PM CDT for southeastern
Texas.

LAT...LON 2998 9505 3011 9537 3016 9536 3017 9501
TIME...MOT...LOC 1407Z 285DEG 32KT 3008 9513 

$$
Cady

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 26, 10:39 PM CDTRip Current StatementHGXBrazoria, Galveston, Matagorda21 hr
Oct 27, 6:10 AM CDTSpecial Marine WarningHGX50 min
Oct 27, 6:44 AM CDTSpecial Weather StatementHGXAustin, Brazos, Grimes, Madison, Washington46 min
Oct 27, 6:56 AM CDTSpecial Marine WarningHGX34 min
Oct 27, 6:58 AM CDTSpecial Marine WarningHGX32 min
Oct 27, 7:23 AM CDTSpecial Marine WarningHGX37 min
Oct 27, 7:31 AM CDTSpecial Weather StatementHGXAustin, Colorado, Grimes, Jackson, Montgomery, Walker and 3 more44 min
Oct 27, 8:06 AM CDTTornado WarningHGXHarris, Montgomery24 min
Oct 27, 8:09 AM CDTSpecial Marine WarningHGX66 min
Oct 27, 8:09 AM CDTSpecial Marine WarningHGX66 min
Oct 27, 8:16 AM CDTTornado WarningHGXHarris29 min
Oct 27, 8:28 AM CDTSpecial Weather StatementHGXBrazoria, Fort Bend, Harris, Liberty, Matagorda, Montgomery and 4 more92 min
Oct 27, 8:38 AM CDTSevere Thunderstorm WarningHGXHarris37 min
Oct 27, 8:55 AM CDTTornado WarningHGXHarris, Liberty35 min
Oct 27, 8:57 AM CDTSpecial Marine WarningHGX93 min
Oct 27, 9:16 AM CDTSevere Thunderstorm WarningHGXHarris29 min
Oct 27, 9:23 AM CDTSevere Thunderstorm WarningHGXChambers, Harris, Liberty37 min
Oct 27, 9:31 AM CDTSpecial Marine WarningHGX119 min
Oct 27, 9:52 AM CDTSpecial Weather StatementHGXChambers, Galveston53 min
Oct 27, 9:58 AM CDTSevere Thunderstorm WarningHGXChambers, Liberty32 min
Oct 27, 11:31 AM CDTSpecial Marine WarningHGX29 min
Oct 27, 11:51 AM CDTSpecial Marine WarningHGX84 min
Oct 27, 3:05 PM CDTWind AdvisoryHGXAustin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more28 hr
Oct 27, 3:26 PM CDTGale WarningHGX36 hr

Nearby

Tornado Warnings in Texas, 2021Every tornado warning in 2021Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.