Alert archive / Texas / Areal Flood Advisories in 2021

Areal Flood Advisory 113, NWS Brownsville, TX

August 3, 2021Zapata County, Texas

NWS Brownsville, TX issued this areal flood advisory at Aug 3, 2021, 7:24 PM CDT for Zapata County, Texas. It was in force for 51 min.

The area

The counties it named.

The facts

Issued: Aug 3, 2021, 7:24 PM CDT (00:24 UTC)
Expired: Aug 3, 2021, 8:15 PM CDT
In force: 51 min
Issued by: NWS Brownsville, TX
Area: Storm-based polygon

County Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 185 km from the middle of the area, began a volume at 00:24 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

Corpus Christi, TX (KCRP), launched 00:00Z, 0.4 hours before the alert went out and 198 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: 2164 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 993 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: -14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Brownsville, TX wrote its last area forecast discussion before this areal flood advisory went out at Aug 3, 6:20 PM CDT, 1 hour 4 minutes earlier.

Area forecast discussion, Aug 3, 6:20 PM CDT, 1 hour 4 minutes before

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Hazardous weather outlook, Aug 3, 4:46 PM CDT, 2 hours 38 minutes before

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In the hours before

Special weather statement, Aug 3, 2:05 PM CDT, 5 hours 19 minutes before

Special Weather Statement
National Weather Service Brownsville TX
205 PM CDT Tue Aug 3 2021

TXZ252-032000-
Starr TX-
205 PM CDT Tue Aug 3 2021

...SPECIAL WEATHER STATEMENT...

At 204 PM CDT, Doppler radar was tracking a strong thunderstorm over
Santa Catarina, or 14 miles east of Viboras, moving northeast at 5
mph.

Wind Gusts of 20 to 30 mph will be possible with this storm.

Locations impacted include...
La Gloria, La Reforma, Santa Catarina, San Isidro, Santa Elena,
Delmita and Diamond O Ranch Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall is also occurring with this storm, and may lead to
minor localized flooding. Do not drive your vehicle through flooded
roadways.

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.

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 2649 9847 2653 9858 2661 9876 2678 9863
      2678 9832
TIME...MOT...LOC 1904Z 231DEG 5KT 2664 9860

60/SPEECE

Special weather statement, Aug 3, 4:37 PM CDT, 2 hours 47 minutes before

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Special weather statement, Aug 3, 4:43 PM CDT, 2 hours 41 minutes before

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Special weather statement, Aug 3, 5:15 PM CDT, 2 hours 9 minutes before

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The office that day

Everything else NWS Brownsville, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 4, 4:21 PM CDT	Areal Flood Advisory	BRO	Zapata	54 min
Aug 4, 4:29 PM CDT	Special Weather Statement	BRO	Zapata	31 min

Nearby

Areal Flood Advisories in Texas, 2021 Every areal flood advisory 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.