Alert archive / Texas / Flash Flood Watches in 2015

Flash Flood Watch 1, NWS Amarillo, TX

April 26, 201520 counties in Texas; Beaver County, Texas County, Oklahoma

NWS Amarillo, TX issued this flash flood watch at Apr 26, 2015, 3:06 PM CDT for 20 counties in Texas; Beaver County, Texas County, Oklahoma. It took effect at Apr 26, 2015, 4:00 PM CDT. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued
Apr 26, 2015, 3:06 PM CDT (20:06 UTC)
In effect from
Apr 26, 2015, 4:00 PM CDT
Expired
Apr 27, 2015, 3:55 PM CDT
In force
24 hr
Issued by
NWS Amarillo, TX
Flood severity
None
All 22 counties

Beaver County, OK, Texas County, OK, Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Dallam County, TX, Deaf Smith County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hartley County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Oldham County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 63 km from the middle of the area, began a volume at 20:05 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, 8.1 hours before the alert went out and 63 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-pSkew-T log-p diagram, Amarillo Airport, TX at 12:00Z on 2015-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 12:00Z on 2015-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -41 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3374 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-41 m²/s²
0-3 km storm-relative helicity
63 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Amarillo, TX wrote its last area forecast discussion before this flash flood watch went out at Apr 26, 2:59 PM CDT, 7 minutes earlier.

Area forecast discussion, Apr 26, 2:59 PM CDT, 7 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
259 PM CDT SUN APR 26 2015

.DISCUSSION...
UPPER LEVEL LOW OVER SOUTHERN NEW MEXICO WILL SLOWLY MOVE EAST
NORTHEAST ACROSS WEST TEXAS AND INTO WESTERN OKLAHOMA BY TUESDAY
MORNING. SEVERAL BOUNDARIES ACROSS THE SOUTHWEST TEXAS PANHANDLE
SHOULD HELP DEVELOP CONVECTION. SEVERAL UPPER LEVEL MINOR VORT MAXES
WILL ALSO ROTATE NORTHEAST FROM THE UPPER LOW THIS AFTERNOON AND
OVERNIGHT. UPPER LEVEL DIFFLUENCE WILL ALSO BE PRESENT OVER THE
PANHANDLES. WITH ALL OF THIS IN MIND...BELIEVE THAT THE PANHANDLES
MAY SEE SOME SEVERE THUNDERSTORMS...BUT ALSO HEAVY RAIN WILL BE A
THREAT. HAVE GONE AHEAD AND ISSUED A FLASH FLOOD WATCH OVER
ABOUT THE EASTERN HALF OF THE PANHANDLES VALID FROM NOW THROUGH
MONDAY AFTERNOON. THIS AREA STANDS THE BEST CHANCE OF HEAVY RAIN-
PRODUCING THUNDERSTORMS. THE RAIN WILL SLOWLY DECREASE MONDAY NIGHT
INTO TUESDAY MORNING AS THE UPPER LOW PULLS AWAY FROM THE
PANHANDLES.

THE PANHANDLES WILL DRY OUT AND WARM UP THROUGH THE END OF THE
WEEK. A POSITIVELY TILTED UPPER TROUGH WILL TRAVERSE THE PLAINS
WEDNESDAY THROUGH FRIDAY. THERE IS AN OUTSIDE CHANCE OF SHOWERS AND
THUNDERSTORMS ACROSS THE NORTH ON SATURDAY AS A WEAK DISTURBANCE
TRIES TO IMPINGE ON THE UPPER RIDGE.

&&

.HYDROLOGY...
RAINFALL MAY EXCEED FLASH FLOOD GUIDANCE ESPECIALLY IN THE
EASTERN PANHANDLES...SO WILL HAVE TO WATCH FOR THE POSSIBILITY
OF SOME FLOODING ISSUES. WIDESPREAD 1 TO 3 INCHES OF RAIN WITH
LOCALLY HEAVIER AMOUNTS WILL BE POSSIBLE.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMARILLO TX                47  49  37  61  40 /  90  80  30  10  10
BEAVER OK                  46  49  39  65  41 / 100  90  40   5  10
BOISE CITY OK              42  50  35  62  39 / 100  80  10   5   5
BORGER TX                  47  48  40  64  42 /  90  90  30  10  10
BOYS RANCH TX              47  49  37  63  39 /  90  80  20  10   5
CANYON TX                  48  50  38  61  39 /  80  70  30  20  10
CLARENDON TX               51  54  42  62  44 /  80  80  40  20  10
DALHART TX                 44  46  36  62  39 / 100  80  20   5  10
GUYMON OK                  45  48  38  64  40 / 100  90  20   0  10
HEREFORD TX                47  49  38  61  39 /  80  70  20  10   5
LIPSCOMB TX                48  49  41  64  42 / 100  90  50  10  10
PAMPA TX                   47  48  39  61  42 /  90  90  40  10  10
SHAMROCK TX                52  54  43  63  43 /  90  80  50  20  10
WELLINGTON TX              54  56  45  64  44 /  80  80  50  20  10

&&

.AMA WATCHES/WARNINGS/ADVISORIES...
TX...FLASH FLOOD WATCH THROUGH MONDAY EVENING FOR THE FOLLOWING
     ZONES: ARMSTRONG...CARSON...COLLINGSWORTH...DONLEY...GRAY...
     HANSFORD...HEMPHILL...HUTCHINSON...LIPSCOMB...OCHILTREE...
     ROBERTS...WHEELER.

OK...FLASH FLOOD WATCH THROUGH MONDAY EVENING FOR THE FOLLOWING
     ZONES: BEAVER...TEXAS.

&&

06/15
Hazardous weather outlook, Apr 26, 12:53 PM CDT, 2 hours 13 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 3:08 PM CDTSpecial Weather StatementAMAHartley52 min
Apr 26, 3:41 PM CDTSevere Thunderstorm WarningAMAHartley, Moore64 min
Apr 26, 4:00 PM CDTSpecial Weather StatementAMAPotter, Randall60 min
Apr 26, 4:11 PM CDTSevere Thunderstorm WarningAMAArmstrong, Carson, Donley, Gray54 min
Apr 26, 4:41 PM CDTSevere Thunderstorm WarningAMAMoore64 min
Apr 26, 5:02 PM CDTSpecial Weather StatementAMACarson58 min
Apr 26, 5:18 PM CDTSevere Thunderstorm WarningAMACarson57 min
Apr 26, 5:40 PM CDTAreal Flood AdvisoryAMACarson4 hr

Nearby

Flash Flood Watches in Texas, 2015Flash Flood Watches in Oklahoma, 2015Every flash flood watch in 2015

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.