Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 10, NWS Amarillo, TX

July 4, 2021Dallam County, Hartley County, Texas

NWS Amarillo, TX issued this flash flood warning at Jul 4, 2021, 5:39 PM CDT for Dallam County, Hartley 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: Jul 4, 2021, 5:39 PM CDT (22:39 UTC)
Expired: Jul 4, 2021, 8:45 PM CDT
In force: 3 hr
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Flood severity: None

Counties Dallam County, TX, Hartley County, TX

The radar

The Amarillo radar (KAMA), 118 km from the middle of the area, began a volume at 22:42 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.7 hours before the alert went out and 119 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: 997 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

108 
WGUS54 KAMA 042239
FFWAMA
TXC111-205-050145-
/O.NEW.KAMA.FF.W.0010.210704T2239Z-210705T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Amarillo TX
539 PM CDT Sun Jul 4 2021

The National Weather Service in Amarillo has issued a

* Flash Flood Warning for...
  Southeastern Dallam County in the panhandle of Texas...
  Northeastern Hartley County in the panhandle of Texas...

* Until 845 PM CDT.

* At 539 PM 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...
  Dalhart.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3608 10254 3610 10252 3609 10249 3608 10248
      3605 10248 3603 10251 3603 10254 3605 10255

FLASH FLOOD...RADAR INDICATED

$$

Guerrero

1 follow-up statement

585 
WGUS74 KAMA 050141
FFSAMA

Flash Flood Statement
National Weather Service Amarillo TX
841 PM CDT Sun Jul 4 2021

TXC111-205-050151-
/O.EXP.KAMA.FF.W.0010.000000T0000Z-210705T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Dallam TX-Hartley TX-
841 PM CDT Sun Jul 4 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 845 PM CDT THIS EVENING FOR 
SOUTHEASTERN DALLAM AND NORTHEASTERN HARTLEY COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures as roads may 
still be flooded from previous rainfall.

LAT...LON 3608 10254 3610 10252 3609 10249 3608 10248
      3605 10248 3603 10251 3603 10254 3605 10255

$$

Guerrero

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 1:28 AM CDT	Special Weather Statement	AMA	Dallam	32 min
Jul 4, 11:42 AM CDT	Special Weather Statement	AMA	Roberts	48 min
Jul 4, 12:34 PM CDT	Special Weather Statement	AMA	Gray	41 min
Jul 4, 2:42 PM CDT	Special Weather Statement	AMA	Sherman	48 min
Jul 4, 3:13 PM CDT	Special Weather Statement	AMA	Sherman	32 min
Jul 4, 3:21 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Moore, Sherman	54 min
Jul 4, 3:50 PM CDT	Areal Flood Advisory	AMA	Dallam	3 hr
Jul 4, 4:14 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Sherman	91 min
Jul 4, 4:32 PM CDT	Severe Thunderstorm Warning	AMA	Hartley, Moore, Oldham, Potter	65 min
Jul 4, 4:46 PM CDT	Areal Flood Advisory	AMA	Moore	3 hr
Jul 4, 4:49 PM CDT	Areal Flood Advisory	AMA	Sherman	2 hr
Jul 4, 5:03 PM CDT	Areal Flood Advisory	AMA	Dallam, Hartley	4 hr
Jul 4, 5:44 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Moore, Sherman	91 min
Jul 4, 6:20 PM CDT	Severe Thunderstorm Warning	AMA	Hansford, Sherman	85 min
Jul 4, 6:51 PM CDT	Special Weather Statement	AMA	Dallam	24 min
Jul 4, 6:59 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	91 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.