Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 48, NWS San Angelo, TX

September 30, 2021Nolan County, Texas

NWS San Angelo, TX issued this flash flood warning at Sep 30, 2021, 3:08 PM CDT for Nolan 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 outline as issued.

The facts

Issued: Sep 30, 2021, 3:08 PM CDT (20:08 UTC)
Expired: Sep 30, 2021, 6:15 PM CDT
In force: 3 hr
Issued by: NWS San Angelo, TX
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Nolan County, TX

The radar

The San Angelo radar (KSJT), 108 km from the middle of the area, began a volume at 20:08 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, 8.1 hours before the alert went out and 170 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: 1726 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 1297 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

991 
WGUS54 KSJT 302008
FFWSJT
TXC353-302315-
/O.NEW.KSJT.FF.W.0048.210930T2008Z-210930T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Angelo TX
308 PM CDT Thu Sep 30 2021

The National Weather Service in San Angelo has issued a

* Flash Flood Warning for...
  Central Nolan County in west central Texas...

* Until 615 PM CDT.

* At 307 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Sweetwater, Maryneal, Camp Boothe Oaks, Lake Sweetwater, The 
  Intersection Of Ranch Road 608 And Highway 147 and The 
  Intersection Of Highway 70 And Ranch Road 53.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3252 10020 3239 10025 3209 10040 3208 10059
      3208 10060 3208 10062 3209 10063 3209 10066
      3230 10065 3252 10044 3252 10043 3252 10042
      3252 10041 3252 10040 3252 10039 3252 10037

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

JW

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 29, 7:04 PM CDT	Special Weather Statement	SJT	McCulloch	41 min
Sep 29, 8:16 PM CDT	Areal Flood Advisory	SJT	McCulloch, Menard	119 min
Sep 29, 8:32 PM CDT	Special Weather Statement	SJT	Menard	43 min
Sep 29, 9:21 PM CDT	Special Weather Statement	SJT	Mason	39 min
Sep 29, 9:48 PM CDT	Areal Flood Advisory	SJT	Kimble, Mason	117 min
Sep 30, 10:36 AM CDT	Special Weather Statement	SJT	Haskell	39 min
Sep 30, 12:58 PM CDT	Special Weather Statement	SJT	Nolan	47 min
Sep 30, 1:44 PM CDT	Flash Flood Warning Considerable damage threat	SJT	Nolan	3 hr
Sep 30, 1:46 PM CDT	Special Weather Statement	SJT	Shackelford	44 min
Sep 30, 2:06 PM CDT	Severe Thunderstorm Warning	SJT	Nolan	39 min
Sep 30, 2:27 PM CDT	Severe Thunderstorm Warning	SJT	Nolan	48 min
Sep 30, 2:42 PM CDT	Special Weather Statement	SJT	Jones	48 min
Sep 30, 2:44 PM CDT	Areal Flood Advisory	SJT	Jones, Taylor	2 hr
Sep 30, 2:50 PM CDT	Special Weather Statement	SJT	Sterling	40 min
Sep 30, 3:16 PM CDT	Special Weather Statement	SJT	Fisher	44 min
Sep 30, 3:28 PM CDT	Special Weather Statement	SJT	Jones	47 min
Sep 30, 3:29 PM CDT	Flash Flood Warning Considerable damage threat	SJT	Callahan, Jones, Shackelford, Taylor	3 hr
Sep 30, 3:45 PM CDT	Severe Thunderstorm Warning	SJT	Fisher, Nolan, Taylor	28 min
Sep 30, 3:51 PM CDT	Severe Thunderstorm Warning	SJT	Jones, Taylor	39 min
Sep 30, 4:09 PM CDT	Areal Flood Advisory	SJT	Fisher, Jones, Nolan, Runnels, Taylor	2 hr
Sep 30, 4:27 PM CDT	Special Weather Statement	SJT	Runnels	48 min
Sep 30, 4:43 PM CDT	Special Weather Statement	SJT	Runnels	32 min
Sep 30, 5:16 PM CDT	Special Weather Statement	SJT	Callahan, Coleman	44 min
Sep 30, 5:50 PM CDT	Special Weather Statement	SJT	Crockett	40 min
Sep 30, 5:52 PM CDT	Areal Flood Advisory	SJT	Coleman, Concho, McCulloch, Runnels	113 min
Sep 30, 5:58 PM CDT	Severe Thunderstorm Warning	SJT	Coleman, Concho, McCulloch	47 min
Sep 30, 6:27 PM CDT	Areal Flood Advisory	SJT	Crockett, Irion	2 hr
Sep 30, 6:43 PM CDT	Severe Thunderstorm Warning	SJT	McCulloch	34 min
Sep 30, 6:46 PM CDT	Flash Flood Warning Considerable damage threat	SJT	Coleman, Concho, McCulloch	3 hr

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.