Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 45, NWS Houston/Galveston, TX

May 11, 2021Brazos County, Burleson County, Grimes County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 11, 2021, 4:10 PM CDT for Brazos County, Burleson County, Grimes County, Texas. It was in force for 35 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: May 11, 2021, 4:10 PM CDT (21:10 UTC)
Expired: May 11, 2021, 4:45 PM CDT
In force: 35 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Brazos County, TX, Burleson County, TX, Grimes County, TX

The radar

The Ft Hood radar (KGRK), 109 km from the middle of the area, began a volume at 21:12 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
May 11, 4:11 PM CDT	TSTM WND DMG	2 W Up429, TX	REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.
May 11, 4:13 PM CDT	HAIL 0.5	2 W Up429, TX	REPORT FROM MPING: HALF-INCH (0.50 IN.).
May 11, 4:23 PM CDT	HAIL 0.75	2 Nnw Up429, TX	PEA TO MARBLE SIZED HAIL AT ROCK PRAIRIE AND FM 2154/WELLBORN RD.

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
May 11, 3:04 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 9.2 hours before the alert went out and 273 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: 521 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 215 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted.

591 
WUUS54 KHGX 112110
SVRHGX
TXC041-051-185-112145-
/O.NEW.KHGX.SV.W.0045.210511T2110Z-210511T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Houston/Galveston TX
410 PM CDT Tue May 11 2021

The National Weather Service in League City has issued a

* Severe Thunderstorm Warning for...
  Northwestern Grimes County in southeastern Texas...
  East central Burleson County in southeastern Texas...
  Southeastern Brazos County in southeastern Texas...

* Until 445 PM CDT.

* At 410 PM CDT, a severe thunderstorm was located near College
  Station, moving east at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  College Station, Millican, Kyle Field, Wellborn and Carlos. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3045 9640 3056 9644 3074 9608 3047 9602
TIME...MOT...LOC 2110Z 252DEG 20KT 3054 9634 

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

1 follow-up statement

348 
WWUS54 KHGX 112141
SVSHGX

Severe Weather Statement
National Weather Service Houston/Galveston TX
441 PM CDT Tue May 11 2021

TXC041-051-185-112150-
/O.EXP.KHGX.SV.W.0045.000000T0000Z-210511T2145Z/
Grimes TX-Burleson TX-Brazos TX-
441 PM CDT Tue May 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GRIMES...EAST
CENTRAL BURLESON AND SOUTHEASTERN BRAZOS COUNTIES WILL EXPIRE AT 445
PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
southeastern Texas.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
League City.

LAT...LON 3045 9640 3056 9644 3074 9608 3047 9602
TIME...MOT...LOC 2140Z 252DEG 20KT 3058 9618 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 3:27 AM CDT	Flash Flood Watch	HGX	Brazos, Grimes, Houston, Madison, Montgomery, Polk and 3 more	24 hr
May 11, 6:28 AM CDT	Areal Flood Advisory	HGX	Polk	3 hr
May 11, 6:46 AM CDT	Special Weather Statement	HGX	Polk	44 min
May 11, 7:25 AM CDT	Severe Thunderstorm Warning	HGX	Polk	35 min
May 11, 8:34 AM CDT	Areal Flood Advisory	HGX	Polk	3 hr
May 11, 10:03 AM CDT	Small Craft Advisory	HGX		3 hr
May 11, 11:05 AM CDT	Special Weather Statement	HGX	Houston	10 min
May 11, 1:09 PM CDT	Special Weather Statement	HGX	Madison	36 min
May 11, 1:21 PM CDT	Special Weather Statement	HGX	Brazos	39 min
May 11, 1:28 PM CDT	Tornado Warning	HGX	Houston, Madison, Walker	32 min
May 11, 1:57 PM CDT	Tornado Warning	HGX	Houston, Madison, Walker	18 min
May 11, 2:20 PM CDT	Tornado Warning Tornado observed	HGX	Houston, Trinity, Walker	25 min
May 11, 2:41 PM CDT	Severe Thunderstorm Warning	HGX	Houston	64 min
May 11, 3:09 PM CDT	Severe Thunderstorm Warning	HGX	Brazos, Burleson	52 min
May 11, 3:31 PM CDT	Severe Thunderstorm Warning	HGX	Houston	44 min
May 11, 3:53 PM CDT	Severe Thunderstorm Warning	HGX	Houston	37 min
May 11, 4:14 PM CDT	Tornado Warning	HGX	Houston, Trinity	31 min
May 11, 4:27 PM CDT	Tornado Warning	HGX	Houston, Trinity, Walker	33 min
May 11, 4:44 PM CDT	Tornado Warning	HGX	Houston, Polk, Trinity	46 min
May 11, 4:54 PM CDT	Severe Thunderstorm Warning	HGX	Polk, San Jacinto, Trinity	51 min
May 11, 5:22 PM CDT	Special Weather Statement	HGX	Montgomery, Waller	38 min
May 11, 5:34 PM CDT	Areal Flood Advisory	HGX	Houston, Madison	116 min
May 11, 5:41 PM CDT	Severe Thunderstorm Warning	HGX	Liberty, Polk, San Jacinto, Trinity	64 min
May 11, 5:49 PM CDT	Areal Flood Advisory	HGX	Houston, San Jacinto, Trinity, Walker	116 min
May 11, 6:18 PM CDT	Severe Thunderstorm Warning	HGX	Liberty	42 min

Nearby

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