Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Houston/Galveston, TX

July 13, 2021Harris County, Texas

NWS Houston/Galveston, TX issued this special weather statement at Jul 13, 2021, 5:39 PM CDT for Harris County, Texas. It was in force for 66 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: Jul 13, 2021, 5:39 PM CDT (22:39 UTC)
Expired: Jul 13, 2021, 6:45 PM CDT
In force: 66 min
Issued by: NWS Houston/Galveston, TX

County Harris County, TX

The radar

The Houston radar (KHGX), 47 km from the middle of the area, began a volume at 22:40 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, 10.7 hours before the alert went out and 211 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: 2962 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 625 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 46 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 Jul 13, 4:08 PM CDT, 1 hour 31 minutes earlier.

Area forecast discussion, Jul 13, 4:08 PM CDT, 1 hour 31 minutes before

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In the hours before

Special weather statement, Jul 13, 3:18 PM CDT, 2 hours 21 minutes before

Special Weather Statement
National Weather Service Houston/Galveston TX
318 PM CDT Tue Jul 13 2021

TXZ198-199-212-213-132100-
Grimes TX-Waller TX-Inland Harris TX-Montgomery TX-
318 PM CDT Tue Jul 13 2021

...THUNDERSTORM IN NORTHWEST HARRIS COUNTY MAY PRODUCE STRONG WIND
GUSTS...

At 317 PM CDT, Doppler radar was tracking a strong thunderstorm near
Tomball, moving northwest at 10 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Tomball, Pinehurst, Waller, Magnolia and Stagecoach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3027 9580 3010 9556 2996 9566 3007 9595
TIME...MOT...LOC 2017Z 122DEG 10KT 3005 9568

Cady

Special weather statement, Jul 13, 3:57 PM CDT, 1 hour 42 minutes before

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Special weather statement, Jul 13, 4:48 PM CDT, 51 minutes before

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Special weather statement, Jul 13, 5:11 PM CDT, 28 minutes before

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Special weather statement, Jul 13, 5:39 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.

Issued	Product	Office	Counties	Lasted
Jul 13, 12:56 PM CDT	River Flood Warning	HGX	Madison, Walker	25 hr
Jul 13, 3:18 PM CDT	Special Weather Statement	HGX	Waller	42 min
Jul 13, 3:18 PM CDT	Severe Thunderstorm Warning	HGX	Harris	27 min
Jul 13, 3:41 PM CDT	Severe Thunderstorm Warning	HGX	Montgomery	34 min
Jul 13, 3:57 PM CDT	Special Weather Statement	HGX	Waller	63 min
Jul 13, 4:48 PM CDT	Special Weather Statement	HGX	Washington	57 min
Jul 13, 5:11 PM CDT	Special Weather Statement	HGX	Brazos, Burleson	64 min
Jul 13, 6:04 PM CDT	Special Weather Statement	HGX	Houston, Madison, Trinity	71 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.