Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 3, NWS Amarillo, TX

May 17, 2021Dallam County, Hartley County, Oldham County, Texas

NWS Amarillo, TX issued this flash flood warning at May 17, 2021, 8:06 PM CDT for Dallam County, Hartley County, Oldham County, Texas. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 17, 2021, 8:06 PM CDT (01:06 UTC)
Expired: May 17, 2021, 8:58 PM CDT
In force: 52 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Flood severity: None

Counties Dallam County, TX, Hartley County, TX, Oldham County, TX

The radar

The Amarillo radar (KAMA), 116 km from the middle of the area, began a volume at 01:10 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 00:00Z, 1.1 hours before the alert went out and 117 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: 1013 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1616 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

799 
WGUS54 KAMA 180106
FFWAMA
TXC111-205-359-180330-
/O.NEW.KAMA.FF.W.0003.210518T0106Z-210518T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Amarillo TX
806 PM CDT Mon May 17 2021

The National Weather Service in Amarillo has issued a

* Flash Flood Warning for...
  Southwestern Dallam County in the panhandle of Texas...
  Hartley County in the panhandle of Texas...
  Northern Oldham County in the panhandle of Texas...

* Until 1030 PM CDT.

* At 806 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 3 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, Hartley, Channing, Romero and Boys Ranch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3612 10304 3607 10240 3548 10220 3542 10304
      3550 10304

FLASH FLOOD...RADAR INDICATED

$$

Beat

1 follow-up statement

763 
WGUS74 KAMA 180158
FFSAMA

Flash Flood Statement
National Weather Service Amarillo TX
858 PM CDT Mon May 17 2021

TXC111-205-359-180208-
/O.CAN.KAMA.FF.W.0003.000000T0000Z-210518T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Dallam TX-Hartley TX-Oldham TX-
858 PM CDT Mon May 17 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN DALLAM, HARTLEY 
AND NORTHERN OLDHAM COUNTIES...

Heavy rainfall has ended and flooding is no longer expected to pose 
a threat. Please continue to heed any remaining road closures.

A Flash Flood Watch remains in effect until 1200 AM CDT for the 
southern Texas Panhandle.

LAT...LON 3612 10304 3607 10240 3548 10220 3542 10304
      3550 10304

$$

Bieda

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 7:06 PM CDT	Areal Flood Advisory	AMA	Randall	21 min
May 17, 7:15 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Hartley, Moore, Sherman	60 min
May 17, 7:15 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Hartley, Moore, Oldham, Potter, Randall	60 min
May 17, 7:27 PM CDT	Flash Flood Warning	AMA	Randall	3 hr
May 17, 7:30 PM CDT	Areal Flood Advisory	AMA	Dallam, Hartley, Oldham	36 min
May 17, 7:33 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Randall	27 min
May 17, 7:35 PM CDT	Areal Flood Advisory	AMA	Potter, Randall	3 hr
May 17, 7:36 PM CDT	Special Weather Statement	AMA	Moore	24 min
May 17, 7:59 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Hartley, Hutchinson, Moore, Potter and 1 more	76 min
May 17, 8:05 PM CDT	Severe Thunderstorm Warning	AMA	Dallam, Sherman	55 min
May 17, 8:09 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Collingsworth, Donley, Gray	66 min
May 17, 8:41 PM CDT	Special Weather Statement	AMA	Dallam, Sherman	34 min
May 17, 9:08 PM CDT	Severe Thunderstorm Warning	AMA	Gray, Roberts	67 min
May 17, 9:15 PM CDT	Severe Thunderstorm Warning	AMA	Carson, Hansford, Hutchinson, Moore, Ochiltree, Potter and 2 more	60 min
May 17, 9:52 PM CDT	Special Weather Statement	AMA	Hansford, Hemphill, Ochiltree, Roberts	23 min
May 17, 10:13 PM CDT	Special Weather Statement	AMA	Hemphill, Lipscomb, Ochiltree, Roberts	62 min
May 17, 11:11 PM CDT	Special Weather Statement	AMA	Lipscomb	49 min
May 18, 6:43 AM CDT	Dense Fog Advisory	AMA	Armstrong, Carson, Deaf Smith, Oldham, Potter, Randall	2 hr
May 18, 10:31 AM CDT	Special Weather Statement	AMA	Deaf Smith	44 min
May 18, 2:43 PM CDT	Special Weather Statement	AMA	Deaf Smith	62 min
May 18, 2:53 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Oldham	97 min
May 18, 3:21 PM CDT	Special Weather Statement	AMA	Carson	39 min
May 18, 4:00 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Oldham, Potter	90 min
May 18, 4:16 PM CDT	Special Weather Statement	AMA	Carson	44 min
May 18, 5:19 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Moore, Oldham, Potter, Randall	86 min
May 18, 5:26 PM CDT	Areal Flood Advisory	AMA	Potter, Randall	3 hr
May 18, 5:27 PM CDT	Special Weather Statement	AMA	Carson	33 min
May 18, 5:45 PM CDT	Areal Flood Advisory	AMA	Armstrong, Carson, Hutchinson	3 hr
May 18, 6:03 PM CDT	Special Weather Statement	AMA	Carson	42 min
May 18, 6:28 PM CDT	Special Weather Statement	AMA	Hutchinson	47 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.