Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 17, NWS San Angelo, TX

July 3, 2021Fisher County, Nolan County, Texas

NWS San Angelo, TX issued this flash flood warning at Jul 3, 2021, 2:22 AM CDT for Fisher County, Nolan County, Texas. It was in force for 113 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 3, 2021, 2:22 AM CDT (07:22 UTC)
Expired: Jul 3, 2021, 4:15 AM CDT
In force: 113 min
Issued by: NWS San Angelo, TX
Area: Storm-based polygon
Flood severity: None

Counties Fisher County, TX, Nolan County, TX

The radar

The Dyess AFB radar (KDYX), 118 km from the middle of the area, began a volume at 07:25 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 00:00Z, 7.4 hours before the alert went out and 173 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: 1700 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1302 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

314 
WGUS54 KSJT 030722
FFWSJT
TXC151-353-030915-
/O.NEW.KSJT.FF.W.0017.210703T0722Z-210703T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Angelo TX
222 AM CDT Sat Jul 3 2021

The National Weather Service in San Angelo has issued a

* Flash Flood Warning for...
  Southwestern Fisher County in west central Texas...
  Western Nolan County in west central Texas...

* Until 415 AM CDT.

* At 219 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain moving into the western Nolan and Fisher Counties. 
  Additional rainfall amounts of 2 to 3 inches are possible in the 
  warned area. With this type of heavy rainfall, flash flooding is 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Sweetwater, Roscoe, portions of I-20, Wastella, Champion, 
  Longworth, Maryneal, Hobbs, Gannon, Camp Boothe Oaks, Capitola, 
  and Busby.

This includes the following Low Water Crossings...
US 180 crossing 7 miles west of Roby, FM 611 crossing 7 miles west 
of Rotan, numerous frontage roads along IH 20, County Road 143 
crossing Idlewild Creek, crossings along County Road 226, County 
Road 108 crossing Kldoogan Creek and County Road 229 crossing 
Cottonwood Creek.

This includes the following highways...
	Interstate 20 between Mile Markers 229 and 252.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3285 10065 3283 10055 3270 10032 3251 10027
      3209 10048 3209 10066

FLASH FLOOD...RADAR INDICATED

$$

7

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 3:33 AM CDT	Areal Flood Advisory	SJT	Coke, Sterling	3 hr
Jul 3, 3:42 AM CDT	Areal Flood Advisory	SJT	Coke, Fisher, Jones, Nolan, Runnels, Taylor	2 hr
Jul 3, 3:54 AM CDT	Flash Flood Warning	SJT	Sterling	111 min
Jul 3, 4:17 AM CDT	Flash Flood Warning	SJT	Fisher	118 min
Jul 3, 4:33 AM CDT	Areal Flood Advisory	SJT	Coke, Irion, Runnels, Sterling, Tom Green	117 min

Nearby

Flash Flood Warnings in Texas, 2021 Every flash 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.