Alert archive / Texas / Flash Flood Warnings in 2021
Flash Flood Warning 39, NWS San Angelo, TX
NWS San Angelo, TX issued this flash flood warning at Aug 18, 2021, 10:13 AM CDT for Callahan 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, 10:13 AM CDT (15:13 UTC)
- Expired
- Aug 18, 2021, 1:15 PM CDT
- In force
- 3 hr
- Issued by
- NWS San Angelo, TX
- Area
- Storm-based polygon
- Flood severity
- None
County Callahan County, TX
The radar
The Dyess AFB radar (KDYX), 23 km from the middle of the area, began a volume at 15:16 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, 3.2 hours before the alert went out and 207 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.
421
WGUS54 KSJT 181513
FFWSJT
TXC059-181815-
/O.NEW.KSJT.FF.W.0039.210818T1513Z-210818T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Angelo TX
1013 AM CDT Wed Aug 18 2021
The National Weather Service in San Angelo has issued a
* Flash Flood Warning for...
Northern Callahan County in west central Texas...
* Until 115 PM CDT.
* At 1011 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen over the past hour or so on top of already saturated
soils. This is expected to result in Flash Flooding across the
warned area.
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...
Clyde, Baird, Putnam, Eula, Dudley and I-20 Near The
Callahan-Eastland County Line.
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 3251 9962 3251 9958 3251 9911 3235 9912
3228 9942 3215 9963
FLASH FLOOD...RADAR INDICATED
$$
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, 8:12 AM CDT | Flash Flood Warning | SJT | Brown, Callahan, Coleman | 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.