Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 14, NWS Amarillo, TX

August 1, 2021Hemphill County, Texas

NWS Amarillo, TX issued this flash flood warning at Aug 1, 2021, 12:27 AM CDT for Hemphill County, Texas. It was in force for 2 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 1, 2021, 12:27 AM CDT (05:27 UTC)
Expired: Aug 1, 2021, 2:30 AM CDT
In force: 2 hr
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Flood severity: None

County Hemphill County, TX

The radar

The Amarillo radar (KAMA), 148 km from the middle of the area, began a volume at 05:29 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

Dodge City, (KDDC), launched 00:00Z, 5.5 hours before the alert went out and 210 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: 1535 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1333 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

238 
WGUS54 KAMA 010527
FFWAMA
TXC211-010730-
/O.NEW.KAMA.FF.W.0014.210801T0527Z-210801T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Amarillo TX
1227 AM CDT Sun Aug 1 2021

The National Weather Service in Amarillo has issued a

* Flash Flood Warning for...
  Central Hemphill County in the panhandle of Texas...

* Until 230 AM CDT.

* At 1227 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Flash flooding is ongoing or 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...
  Canadian and Lake Marvin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3594 10046 3596 10039 3592 10000 3583 10001
      3587 10045

FLASH FLOOD...RADAR INDICATED

$$

LFM

1 follow-up statement

148 
WGUS74 KAMA 010726
FFSAMA

Flash Flood Statement
National Weather Service Amarillo TX
226 AM CDT Sun Aug 1 2021

TXC211-010735-
/O.EXP.KAMA.FF.W.0014.000000T0000Z-210801T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hemphill TX-
226 AM CDT Sun Aug 1 2021

...THE FLASH FLOOD WARNING FOR CENTRAL HEMPHILL COUNTY WILL EXPIRE AT
230 AM CDT...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed any remaining road closures. 

LAT...LON 3594 10046 3596 10039 3592 10000 3583 10001
      3587 10045

$$

14

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 7:08 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	25 min
Jul 31, 7:14 PM CDT	Areal Flood Advisory	AMA	Potter, Randall	3 hr
Jul 31, 8:04 PM CDT	Special Weather Statement	AMA	Carson	26 min
Jul 31, 8:18 PM CDT	Special Weather Statement	AMA	Randall	27 min
Jul 31, 8:57 PM CDT	Special Weather Statement	AMA	Randall	33 min
Jul 31, 10:00 PM CDT	Special Weather Statement	AMA	Gray	30 min
Jul 31, 10:10 PM CDT	Severe Thunderstorm Warning	AMA	Hansford, Ochiltree	65 min
Jul 31, 10:12 PM CDT	Severe Thunderstorm Warning	AMA	Carson, Gray	63 min
Jul 31, 11:05 PM CDT	Special Weather Statement	AMA	Hutchinson, Ochiltree, Roberts	25 min
Jul 31, 11:28 PM CDT	Areal Flood Advisory	AMA	Hansford, Ochiltree	3 hr
Jul 31, 11:44 PM CDT	Special Weather Statement	AMA	Hemphill	46 min
Jul 31, 11:57 PM CDT	Areal Flood Advisory	AMA	Hemphill, Roberts	3 hr
Aug 1, 1:12 AM CDT	Areal Flood Advisory	AMA	Armstrong, Randall	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.