Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Houston/Galveston, TX

October 23, 2021Brazoria County, Texas

NWS Houston/Galveston, TX issued this special weather statement at Oct 23, 2021, 4:45 PM CDT for Brazoria 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: Oct 23, 2021, 4:45 PM CDT (21:45 UTC)
Expired: Oct 23, 2021, 5:15 PM CDT
In force: 30 min
Issued by: NWS Houston/Galveston, TX
Hail: 0.00 in
Wind: 40

County Brazoria County, TX

The radar

The Houston radar (KHGX), 39 km from the middle of the area, began a volume at 21:48 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, 9.8 hours before the alert went out and 234 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: 1177 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 818 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Oct 23, 3:39 PM CDT, 1 hour 6 minutes earlier.

Area forecast discussion, Oct 23, 3:39 PM CDT, 1 hour 6 minutes before

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<body>
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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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In the hours before

Special weather statement, Oct 23, 4:45 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Houston/Galveston TX
445 PM CDT Sat Oct 23 2021

TXZ227-237-238-337-232215-
Inland Brazoria TX-Inland Galveston TX-Fort Bend TX-
Coastal Brazoria TX-
445 PM CDT Sat Oct 23 2021

...A strong thunderstorm will impact portions of western Galveston,
southeastern Fort Bend and northeastern Brazoria Counties through 515
PM CDT...

At 445 PM CDT, Doppler radar was tracking a strong thunderstorm near
Angleton, moving north at 20 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Southern Pearland, southwestern Friendswood, Alvin, Angleton, Manvel,
Fresno, Danbury, Arcola, Iowa Colony, Holiday Lakes, Bailey's
Prairie, Liverpool, Bonney, Thompsons, Sienna Plantation, Brazos Bend
State Park, Juliff and Rosharon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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 2914 9534 2916 9560 2953 9567 2952 9519
TIME...MOT...LOC 2145Z 184DEG 17KT 2921 9545

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

CB

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 23, 5:04 AM CDT	Dense Fog Advisory	HGX	Austin, Brazoria, Colorado, Fort Bend, Matagorda, Waller and 1 more	4 hr
Oct 23, 6:33 PM CDT	Special Weather Statement	HGX	Galveston	27 min

Nearby

Special Weather Statements in Texas, 2021 Every special weather statement 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.