Alert archive / Texas / Flash Flood Warnings in 2012

Flash Flood Warning 5, NWS Amarillo, TX

August 20, 2012Randall County, Texas

NWS Amarillo, TX issued this flash flood warning at Aug 20, 2012, 7:48 PM CDT for Randall County, Texas. It was in force for 118 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 20, 2012, 7:48 PM CDT (00:48 UTC)
Expired: Aug 20, 2012, 9:46 PM CDT
In force: 118 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon
Flood severity: None

County Randall County, TX

The radar

The Amarillo radar (KAMA), 35 km from the middle of the area, began a volume at 00:51 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.

What was reported inside it

Time	Report	Where	Remark
Aug 20, 8:00 PM CDT	FLASH FLOOD	2 S Amarillo, TX	27TH STREET EAST OF INTERSTATE 27 IS FLOODED. TIME ESTIMATED.
Aug 20, 8:09 PM CDT	FLASH FLOOD	5 S Amarillo, TX	EMERGENCY MANAGER REPORTED NUMEROUS FLOODED INTERSECTIONS AND VEHICLES STRANDED WITH WATER RESCUES BEING CONDUCTED.
Aug 20, 8:41 PM CDT	FLASH FLOOD	Nw Palo Duro Canyon, TX	WATER 3.5 TO 4.0 FEET OVER THE FIRST LOW WATER CROSSING. WATER WAS 6 FEET OVER THE OTHER LOW WATER CROSSINGS IN THE PARK.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 0.8 hours before the alert went out and 36 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: 284 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 2322 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 317 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

152 
WGUS54 KAMA 210048
FFWAMA
TXC381-210345-
/O.NEW.KAMA.FF.W.0005.120821T0048Z-120821T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AMARILLO TX
748 PM CDT MON AUG 20 2012

THE NATIONAL WEATHER SERVICE IN AMARILLO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  RANDALL COUNTY IN THE PANHANDLE OF TEXAS...
  THIS INCLUDES THE CITES OF AMARILLO AND CANYON...

* UNTIL 1045 PM CDT

* AT 747 PM CDT... LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH   
FLOODING ALONG I-27 SOUTH OF AMARILLO

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
AMARILLO...PALO DURO AND CANYON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL RESULT IN FLOODING OF MANY
STREETS ACROSS THE CITY OF AMARILLO...ESPECIALLY IN POOR DRAINAGE
AREAS. MOTORISTS ARE URGED TO AVOID FLOODED ROADWAYS AS THE HIGH
WATER LEVELS...UP TO SEVERAL FEET DEEP IN SOME INSTANCES...MAY CAUSE
CARS TO STALL AND POSE A HAZARD TO PUBLIC SAFETY.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

TO REPORT FLOODING...PLEASE CALL THE NATIONAL WEATHER SERVICE AT 8 0
6 3 3 5 1 1 2 1.

&&

LAT...LON 3475 10215 3498 10217 3518 10217 3519 10200
      3518 10163 3503 10162 3475 10163

$$

MOULTON

1 follow-up statement

176 
WGUS74 KAMA 210246
FFSAMA

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AMARILLO TX
946 PM CDT MON AUG 20 2012

TXC381-210256-
/O.CAN.KAMA.FF.W.0005.000000T0000Z-120821T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RANDALL TX-
946 PM CDT MON AUG 20 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR RANDALL COUNTY...

NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED RAINFALL WAS ENDING
ACROSS THE WARNED AREA...AND THE FLASH FLOOD THREAT WAS DIMINISHING.
SOME MINOR FLOODING MAY CONTINUE...BUT THE THREAT OF SERIOUS FLOODING
IS ENDING. THUS...THE FLASH FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 3475 10215 3498 10217 3518 10217 3519 10200
      3518 10163 3503 10162 3475 10163

$$

MOULTON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 20, 7:17 PM CDT	Areal Flood Advisory	AMA	Randall	6 hr
Aug 20, 7:25 PM CDT	Severe Thunderstorm Warning	AMA	Deaf Smith, Randall	50 min
Aug 20, 7:32 PM CDT	Severe Thunderstorm Warning	AMA	Carson, Hutchinson, Moore, Potter	58 min
Aug 20, 7:49 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Randall	56 min
Aug 20, 7:55 PM CDT	Flash Flood Warning	AMA	Potter	113 min
Aug 20, 8:02 PM CDT	Areal Flood Advisory	AMA	Armstrong, Carson, Hutchinson	4 hr
Aug 20, 8:31 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Donley, Gray	43 min
Aug 20, 8:51 PM CDT	Areal Flood Advisory	AMA	Donley	4 hr

Nearby

Flash Flood Warnings in Texas, 2012 Every flash flood warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.