Alert archive / Texas / Areal Flood Warnings in 2021

Areal Flood Warning 5, NWS San Angelo, TX

August 17, 2021Irion County, Tom Green County, Texas

NWS San Angelo, TX issued this areal flood warning at Aug 17, 2021, 10:31 AM CDT for Irion County, Tom Green County, Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 17, 2021, 10:31 AM CDT (15:31 UTC)
Expired: Aug 17, 2021, 1:30 PM CDT
In force: 3 hr
Issued by: NWS San Angelo, TX
Area: Storm-based polygon
Flood severity: None

Counties Irion County, TX, Tom Green County, TX

The radar

The San Angelo radar (KSJT), 22 km from the middle of the area, began a volume at 15:33 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

Midland Regional, TX (KMAF), launched 12:00Z, 3.5 hours before the alert went out and 155 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: 134 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 779 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

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

NWS San Angelo, TX wrote its last area forecast discussion before this areal flood warning went out at Aug 17, 7:00 AM CDT, 3 hours 31 minutes earlier.

Area forecast discussion, Aug 17, 7:00 AM CDT, 3 hours 31 minutes before

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Hazardous weather outlook, Aug 17, 3:42 AM CDT, 6 hours 49 minutes before

Hazardous Weather Outlook
National Weather Service San Angelo TX
342 AM CDT Tue Aug 17 2021

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-
140-154-155-168>170-180845-
Fisher-Nolan-Sterling-Coke-Runnels-Irion-Tom Green-Concho-
Crockett-Schleicher-Sutton-Haskell-Throckmorton-Jones-Shackelford-
Taylor-Callahan-Coleman-Brown-McCulloch-San Saba-Menard-Kimble-
Mason-
342 AM CDT Tue Aug 17 2021

This Hazardous Weather Outlook is for portions of west central
Texas.

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms are possible today and tonight.
The main hazards will be heavy rainfall which could lead to
localized flooding and dangerous lightning.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Scattered showers and thunderstorms are again possible on
Wednesday. The main hazards will be heavy rainfall which could lead
to localized flooding and dangerous lightning.

.SPOTTER INFORMATION STATEMENT...
Spotter activation is not anticipated at this time.

In the hours before

Local storm report, Aug 17, 8:09 AM CDT, 2 hours 22 minutes before

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Local storm report, Aug 17, 8:46 AM CDT, 1 hour 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN ANGELO TX
846 AM CDT TUE AUG 17 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0843 AM     FLASH FLOOD      2 WSW SAN ANGELO        31.43N 100.48W
08/17/2021                   TOM GREEN          TX   LAW ENFORCEMENT

            THE SAN ANGELO POLICE DEPARTMENT REPORTED
            THAT MULTIPLE ROADS ACROSS THE CITY REMAIN
            FLOODED.

&&

CRD

Local storm report, Aug 17, 8:48 AM CDT, 1 hour 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN ANGELO TX
848 AM CDT TUE AUG 17 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0825 AM     FLASH FLOOD      ARDEN                   31.44N 100.76W
08/17/2021                   IRION              TX   LAW ENFORCEMENT

            THE TOM GREEN COUNTY SHERIFFS OFFICE
            REPORTED FLOODED ROADS IN THE TOWN OF ARDEN.

&&

CRD

Local storm report, Aug 17, 8:49 AM CDT, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN ANGELO TX
849 AM CDT TUE AUG 17 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0836 AM     FLASH FLOOD      5 WNW SAN ANGELO        31.47N 100.54W
08/17/2021                   TOM GREEN          TX   LAW ENFORCEMENT

            THE TOM GREEN SHERIFFS OFFICE REPORTED
            WIDESPREAD FLOODING ALONG FM 2288.

&&

CRD

Local storm report, Aug 17, 9:26 AM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN ANGELO TX
926 AM CDT TUE AUG 17 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0855 AM     FLASH FLOOD      MERTZON                 31.26N 100.82W
08/17/2021                   IRION              TX   PUBLIC

            A SOCIAL MEDIA POST INDICATED SEVERAL
            STREETS AND LOW WATER CROSSINGS FLOODED IN
            MERTZON.

&&

CRD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 5:34 AM CDT	Areal Flood Advisory	SJT	Irion, Sterling, Tom Green	2 hr
Aug 17, 6:08 AM CDT	Flash Flood Warning	SJT	Irion, Tom Green	112 min
Aug 17, 6:55 AM CDT	Flash Flood Warning Considerable damage threat	SJT	Tom Green	110 min
Aug 17, 7:10 AM CDT	Flash Flood Warning Considerable damage threat	SJT	Irion	3 hr
Aug 17, 7:33 AM CDT	Flash Flood Warning Considerable damage threat	SJT	Irion, Tom Green	3 hr
Aug 17, 7:47 AM CDT	Flash Flood Warning Considerable damage threat	SJT	Irion, Tom Green	3 hr
Aug 17, 8:39 AM CDT	Flash Flood Warning Considerable damage threat	SJT	Tom Green	111 min
Aug 17, 8:55 AM CDT	Flash Flood Warning Considerable damage threat	SJT	Tom Green	3 hr
Aug 17, 9:04 AM CDT	Areal Flood Advisory	SJT	Schleicher	3 hr
Aug 17, 9:36 AM CDT	Flash Flood Warning Considerable damage threat	SJT	Schleicher	3 hr
Aug 17, 9:54 AM CDT	River Flood Warning	SJT	Irion, Tom Green	22 hr
Aug 17, 10:36 AM CDT	Areal Flood Advisory	SJT	Concho, Menard	3 hr
Aug 17, 11:10 AM CDT	Areal Flood Advisory	SJT	McCulloch	3 hr
Aug 17, 12:19 PM CDT	Flash Flood Warning Considerable damage threat	SJT	Schleicher	3 hr
Aug 17, 12:34 PM CDT	Flash Flood Watch	SJT	Coke, Concho, Crockett, Irion, Menard, Runnels and 4 more	16 hr
Aug 17, 12:49 PM CDT	Flash Flood Warning Considerable damage threat	SJT	Schleicher, Sutton	3 hr
Aug 17, 1:50 PM CDT	Special Weather Statement	SJT	Kimble	40 min
Aug 17, 2:26 PM CDT	Flash Flood Warning Considerable damage threat	SJT	Kimble, Sutton	2 hr
Aug 17, 3:10 PM CDT	Areal Flood Warning	SJT	Irion, Tom Green	6 hr
Aug 17, 4:24 PM CDT	Flash Flood Warning	SJT	Kimble	111 min
Aug 17, 6:33 PM CDT	River Flood Warning	SJT	Tom Green	10 hr

Nearby

Areal Flood Warnings in Texas, 2021 Every areal flood warning 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.