Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 38, NWS San Angelo, TX
NWS San Angelo, TX issued this flash flood warning at Aug 18, 2021, 8:12 AM CDT for Brown County, Callahan County, Coleman 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
- Aug 18, 2021, 8:12 AM CDT (13:12 UTC)
- Expired
- Aug 18, 2021, 11:15 AM CDT
- In force
- 3 hr
- Issued by
- NWS San Angelo, TX
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Brown County, TX, Callahan County, TX, Coleman County, TX
The radar
The Dyess AFB radar (KDYX), 62 km from the middle of the area, began a volume at 13:11 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
Fort Worth, TX (KFWD), launched 12:00Z, 1.2 hours before the alert went out and 214 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.
- Mixed-layer CAPE
- 500 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 580 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- -2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
142
WGUS54 KSJT 181312
FFWSJT
TXC049-059-083-181615-
/O.NEW.KSJT.FF.W.0038.210818T1312Z-210818T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Angelo TX
812 AM CDT Wed Aug 18 2021
The National Weather Service in San Angelo has issued a
* Flash Flood Warning for...
Northwestern Brown County in west central Texas...
Southern Callahan County in west central Texas...
Northern Coleman County in west central Texas...
* Until 1115 AM CDT.
* At 811 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. 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...
Coleman, Cross Plains, Novice, Burkett, Silver Valley, Cross Cut,
Grosvenor, Oplin, Glen Cove, Lake Brownwood, Valera, Talpa, May,
Echo, Lake Coleman and Hords Creek Reservoir.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3216 9962 3229 9942 3236 9912 3208 9912
3208 9892 3200 9887 3188 9905 3173 9921
3175 9927 3181 9933 3171 9952 3167 9972
3208 9971 3208 9963
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SNThe office that day
Everything else NWS San Angelo, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 4:46 AM CDT | Areal Flood Advisory | SJT | Runnels | 119 min |
| Aug 18, 6:54 AM CDT | Areal Flood Advisory | SJT | Callahan, Coleman | 2 hr |
| Aug 18, 10:13 AM CDT | Flash Flood Warning | SJT | Callahan | 3 hr |
| Aug 18, 11:25 AM CDT | Areal Flood Advisory | SJT | Shackelford | 3 hr |
| Aug 18, 12:42 PM CDT | Flash Flood Warning | SJT | Runnels | 3 hr |
| Aug 18, 1:13 PM CDT | Flash Flood Warning | SJT | Callahan, Coleman | 3 hr |
| Aug 18, 1:56 PM CDT | Areal Flood Advisory | SJT | Coke, Runnels | 3 hr |
Nearby
Flash Flood Warnings in Texas, 2021Every 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.