Alert archive / Texas / Areal Flood Advisories in 2021

Areal Flood Advisory 85, NWS Brownsville, TX

July 9, 2021Cameron County, Texas

NWS Brownsville, TX issued this areal flood advisory at Jul 9, 2021, 3:36 PM CDT for Cameron County, Texas. It was in force for 26 min.

The area

The counties it named.

The facts

Issued: Jul 9, 2021, 3:36 PM CDT (20:36 UTC)
Expired: Jul 9, 2021, 4:02 PM CDT
In force: 26 min
Issued by: NWS Brownsville, TX
Area: Storm-based polygon

County Cameron County, TX

The radar

The Brownsville radar (KBRO), 27 km from the middle of the area, began a volume at 20:35 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 12:00Z, 8.6 hours before the alert went out and 176 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: 994 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 646 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 7 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 Jul 9, 1:55 PM CDT, 1 hour 41 minutes earlier.

Area forecast discussion, Jul 9, 1:55 PM CDT, 1 hour 41 minutes before

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Hazardous weather outlook, Jul 9, 10:30 AM CDT, 5 hours 6 minutes before

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In the hours before

Local storm report, Jul 9, 9:36 AM CDT, 6 hours before

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Local storm report, Jul 9, 9:59 AM CDT, 5 hours 37 minutes before

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Local storm report, Jul 9, 10:07 AM CDT, 5 hours 29 minutes before

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Special weather statement, Jul 9, 2:57 PM CDT, 39 minutes before

Special Weather Statement
National Weather Service Brownsville TX
257 PM CDT Fri Jul 9 2021

TXZ252-253-353-092045-
Southern Hidalgo TX-Northern Hidalgo TX-Starr TX-
257 PM CDT Fri Jul 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL HIDALGO AND SOUTHEASTERN
STARR COUNTIES UNTIL 345 PM CDT...

At 257 PM CDT, Doppler radar was tracking a strong thunderstorm over
Sharyland High School, or over Sharyland, moving north at 25 mph.

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

Locations impacted include...
Edinburg, Mission, Pharr, San Juan, Alamo, Donna, Hidalgo, Palmview,
Penitas and Sullivan City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 2605 9807 2607 9808 2607 9813 2605 9815
      2607 9818 2607 9825 2610 9829 2612 9827
      2612 9828 2610 9830 2613 9833 2617 9834
      2616 9839 2623 9845 2620 9848 2621 9850
      2652 9866 2658 9809 2607 9799 2604 9808
TIME...MOT...LOC 1957Z 172DEG 20KT 2621 9827

Mejia

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 9:27 PM CDT	Areal Flood Advisory	BRO	Cameron	56 min
Jul 9, 1:47 AM CDT	Areal Flood Advisory	BRO	Cameron	118 min
Jul 9, 2:18 AM CDT	Rip Current Statement	BRO	Kenedy	17 hr
Jul 9, 3:41 AM CDT	Flash Flood Warning	BRO	Cameron	6 hr
Jul 9, 4:32 AM CDT	Special Weather Statement	BRO	Cameron	43 min
Jul 9, 5:03 AM CDT	Special Weather Statement	BRO	Cameron	42 min
Jul 9, 5:08 AM CDT	Areal Flood Advisory	BRO	Cameron	2 hr
Jul 9, 5:14 AM CDT	Special Marine Warning	BRO		46 min
Jul 9, 5:22 AM CDT	Severe Thunderstorm Warning	BRO	Cameron	38 min
Jul 9, 5:44 AM CDT	Flash Flood Warning	BRO	Cameron	4 hr
Jul 9, 5:51 AM CDT	Special Marine Warning	BRO		54 min
Jul 9, 6:05 AM CDT	Special Marine Warning	BRO		25 min
Jul 9, 6:24 AM CDT	Special Marine Warning	BRO		51 min
Jul 9, 6:47 AM CDT	Flash Flood Warning	BRO	Cameron	3 hr
Jul 9, 7:05 AM CDT	Special Marine Warning	BRO		55 min
Jul 9, 9:16 AM CDT	Small Craft Advisory	BRO		4 hr
Jul 9, 9:36 AM CDT	Areal Flood Advisory	BRO	Cameron	4 hr
Jul 9, 9:39 AM CDT	Areal Flood Advisory	BRO	Cameron	4 hr
Jul 9, 9:42 AM CDT	Areal Flood Advisory	BRO	Cameron	4 hr
Jul 9, 2:57 PM CDT	Special Weather Statement	BRO	Hidalgo	48 min
Jul 9, 3:40 PM CDT	Areal Flood Advisory	BRO	Cameron	13 min
Jul 9, 3:44 PM CDT	Flash Flood Warning	BRO	Cameron	2 hr
Jul 9, 3:52 PM CDT	Flash Flood Warning	BRO	Cameron	42 min
Jul 9, 4:23 PM CDT	Flash Flood Warning	BRO	Cameron	2 hr
Jul 9, 4:59 PM CDT	Areal Flood Advisory	BRO	Willacy	51 min
Jul 9, 5:09 PM CDT	Special Weather Statement	BRO	Brooks	51 min
Jul 9, 5:10 PM CDT	Special Weather Statement	BRO	Kenedy	50 min
Jul 9, 5:45 PM CDT	Areal Flood Advisory	BRO	Cameron	51 min
Jul 9, 5:59 PM CDT	Special Weather Statement	BRO	Kleberg	16 min
Jul 9, 6:01 PM CDT	Special Weather Statement	BRO	Kenedy	14 min
Jul 9, 6:09 PM CDT	Areal Flood Advisory	BRO	Kenedy, Willacy	51 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.