Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Houston/Galveston, TX

August 15, 2021Harris County, Texas

NWS Houston/Galveston, TX issued this special weather statement at Aug 15, 2021, 5:45 PM CDT for Harris County, Texas. It was in force for 60 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
Aug 15, 2021, 5:45 PM CDT (22:45 UTC)
Expired
Aug 15, 2021, 6:45 PM CDT
In force
60 min
Issued by
NWS Houston/Galveston, TX
Hail
0.00 in
Wind
30

County Harris County, TX

The radar

The Houston radar (KHGX), 25 km from the middle of the area, began a volume at 22:47 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 nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.8 hours before the alert went out and 203 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 2021-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1002 joules per kilogram.LCLLFCEL10008507005003002001001 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, Lake Charles Mun, LA at 12:00Z on 2021-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.1939Sfc1 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
1002 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
810 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
-55 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 Aug 15, 3:35 PM CDT, 2 hours 10 minutes earlier.

Area forecast discussion, Aug 15, 3:35 PM CDT, 2 hours 10 minutes before
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In the hours before

Special weather statement, Aug 15, 3:53 PM CDT, 1 hour 52 minutes before
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Special weather statement, Aug 15, 4:18 PM CDT, 1 hour 27 minutes before
Special Weather Statement
National Weather Service Houston/Galveston TX
418 PM CDT Sun Aug 15 2021

TXZ227-152145-
Fort Bend TX-
418 PM CDT Sun Aug 15 2021

...A thunderstorm will produce strong wind gusts portions of central
Fort Bend County through 445 PM CDT...

At 417 PM CDT, Doppler radar was tracking a strong thunderstorm over
southeastern Sugar Land, moving west at 15 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...
Sugar Land, southwestern Missouri City, Rosenberg, Stafford,
Richmond, First Colony, Pecan Grove, Pleak, Thompsons, Greatwood, New
Territory, Fifth Street, Riverstone, Cumings, Four Corners, Cinco
Ranch and northwestern Sienna Plantation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 2962 9554 2949 9556 2950 9582 2971 9577
TIME...MOT...LOC 2117Z 100DEG 13KT 2958 9562

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

Cady
Special weather statement, Aug 15, 5:31 PM CDT, 14 minutes before
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Special weather statement, Aug 15, 5:45 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 7:14 PM CDTSpecial Weather StatementHGXSan Jacinto31 min
Aug 14, 10:15 PM CDTSpecial Weather StatementHGXHarris30 min
Aug 15, 3:53 PM CDTSpecial Weather StatementHGXWaller67 min
Aug 15, 4:18 PM CDTSpecial Weather StatementHGXFort Bend27 min
Aug 15, 4:28 PM CDTSevere Thunderstorm WarningHGXFort Bend32 min
Aug 15, 5:21 PM CDTAreal Flood AdvisoryHGXFort Bend, Harris54 min
Aug 15, 5:31 PM CDTSpecial Weather StatementHGXBrazoria, Fort Bend, Jackson, Wharton59 min
Aug 15, 5:53 PM CDTAreal Flood AdvisoryHGXFort Bend52 min
Aug 15, 6:33 PM CDTSpecial Weather StatementHGXMatagorda57 min

Nearby

Special Weather Statements in Texas, 2021Every 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.