Alert archive / Texas / Tornado Watches in 2015

Tornado Watch 59

April 16, 2015Beaver County, Texas County, Oklahoma; 14 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 16, 2015, 1:48 PM CDT for Beaver County, Texas County, Oklahoma; 14 counties in Texas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Apr 16, 2015, 1:48 PM CDT (18:48 UTC)
Expired
Apr 16, 2015, 10:00 PM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt

Counties Beaver County, OK, Texas County, OK, Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Ochiltree County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 116 km from the middle of the area, began a volume at 18:49 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
30%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
20%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

33 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 16, 1:49 PM CDTSevere Thunderstorm WarningAMAHansford, Ochiltree56 min
Apr 16, 2:17 PM CDTTornado WarningAMAHutchinson, Roberts28 min
Apr 16, 2:24 PM CDTSevere Thunderstorm WarningAMACarson, Hutchinson66 min
Apr 16, 2:32 PM CDTSevere Thunderstorm WarningAMAPotter, Randall58 min
Apr 16, 2:34 PM CDTSevere Thunderstorm WarningAMABeaver56 min
Apr 16, 2:45 PM CDTTornado WarningAMARoberts30 min
Apr 16, 2:47 PM CDTSevere Thunderstorm WarningAMAOchiltree58 min
Apr 16, 3:03 PM CDTSevere Thunderstorm WarningAMACarson, Potter57 min
Apr 16, 3:07 PM CDTSevere Thunderstorm WarningAMARoberts38 min
Apr 16, 3:12 PM CDTSevere Thunderstorm WarningAMAPotter, Randall30 min
Apr 16, 3:31 PM CDTSevere Thunderstorm WarningAMACarson, Hutchinson44 min
Apr 16, 3:36 PM CDTSevere Thunderstorm WarningAMABeaver54 min
Apr 16, 3:42 PM CDTSevere Thunderstorm WarningAMARoberts63 min
Apr 16, 3:47 PM CDTSevere Thunderstorm WarningAMAArmstrong, Carson28 min
Apr 16, 3:52 PM CDTTornado Warning Tornado observedAMACarson7 min
Apr 16, 4:12 PM CDTSevere Thunderstorm WarningAMACarson, Gray, Hutchinson, Roberts63 min
Apr 16, 4:45 PM CDTSevere Thunderstorm WarningAMAGray, Roberts60 min
Apr 16, 5:01 PM CDTTornado WarningAMAGray29 min
Apr 16, 5:13 PM CDTSevere Thunderstorm WarningAMAHemphill32 min
Apr 16, 5:16 PM CDTTornado WarningAMAGray, Roberts29 min
Apr 16, 5:25 PM CDTTornado Warning Tornado observedAMAHemphill35 min
Apr 16, 5:39 PM CDTTornado WarningAMAGray, Wheeler51 min
Apr 16, 5:46 PM CDTSevere Thunderstorm WarningAMAHemphill, Lipscomb, Roberts59 min
Apr 16, 5:59 PM CDTSevere Thunderstorm WarningAMACollingsworth, Donley, Gray, Wheeler61 min
Apr 16, 6:20 PM CDTTornado Warning Tornado observedAMAHemphill, Wheeler25 min
Apr 16, 6:30 PM CDTTornado WarningAMAGray, Wheeler45 min
Apr 16, 6:45 PM CDTSevere Thunderstorm WarningAMAHemphill, Lipscomb45 min
Apr 16, 6:55 PM CDTSevere Thunderstorm WarningAMADonley33 min
Apr 16, 6:58 PM CDTTornado WarningAMAWheeler37 min
Apr 16, 7:06 PM CDTSevere Thunderstorm WarningAMAWheeler54 min
Apr 16, 7:29 PM CDTSevere Thunderstorm WarningAMAGray31 min
Apr 16, 7:54 PM CDTSevere Thunderstorm WarningAMAWheeler66 min
Apr 16, 8:39 PM CDTFlash Flood WarningAMAWheeler4 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 6.8 hours before the alert went out and 116 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 2015-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 246 joules per kilogram.LCLLFCEL10008507005003002001001 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 2015-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 square meters per square second.19395878Sfc1 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
246 J/kg
Mixed-layer CIN
-181 J/kg
Mixed-layer LCL
2122 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
172 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

646 
WWUS20 KWNS 161845
SEL9  
SPC WW 161845
OKZ000-TXZ000-170300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 59
NWS STORM PREDICTION CENTER NORMAN OK
145 PM CDT THU APR 16 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  THE EASTERN OKLAHOMA PANHANDLE
  THE EASTERN TEXAS PANHANDLE

* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 145 PM UNTIL
  1000 PM CDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE
  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
    INCHES IN DIAMETER POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

SUMMARY...THUNDERSTORMS DEVELOPING ALONG A STATIONARY FRONT/DRYLINE
WILL MOVE NEWD ACROSS THE ERN TX/OK PANHANDLES THROUGH THE
AFTERNOON/EVENING.  SUPERCELLS WILL BE POSSIBLE...WITH A RISK FOR
LARGE HAIL...DAMAGING GUSTS...AND A COUPLE OF TORNADOES.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 40 STATUTE
MILES EAST AND WEST OF A LINE FROM 95 MILES NORTH NORTHEAST OF
BORGER TEXAS TO 70 MILES SOUTH SOUTHEAST OF BORGER TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

&&

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 23020.


...THOMPSON

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 16, 12:17 PM CDTMesoscale DiscussionSPCBeaver, Harper118 min
Apr 16, 2:42 PM CDTMesoscale DiscussionSPCLove63 min
Apr 16, 4:06 PM CDTMesoscale DiscussionSPCJackson2 hr
Apr 16, 4:40 PM CDTSevere Thunderstorm WatchSPCComanche, Cotton, Greer, Harmon, Jackson, Kiowa and 1 more7 hr
Apr 16, 4:44 PM CDTMesoscale DiscussionSPCBeckham, Blaine, Custer, Dewey, Ellis, Greer and 7 more3 hr
Apr 16, 4:59 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beckham, Blaine, Caddo, Custer, Dewey and 9 more7 hr
Apr 16, 5:06 PM CDTMesoscale DiscussionSPCBeaver, Texas84 min
Apr 16, 5:29 PM CDTMesoscale DiscussionSPCCimarron91 min
Apr 16, 5:41 PM CDTMesoscale DiscussionSPCBeckham, Roger Mills94 min
Apr 16, 6:09 PM CDTTornado WatchSPCBeckham, Ellis, Greer, Harmon, Roger Mills6 hr
Apr 16, 12:49 PM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Castro, Crosby, Donley and 15 more116 min
Apr 16, 1:34 PM CDTMesoscale DiscussionSPCAustin, Bastrop, Bell, Bexar, Blanco, Bosque and 48 more116 min
Apr 16, 2:22 PM CDTSevere Thunderstorm WatchSPCAnderson, Aransas, Austin, Bastrop, Bee, Bell and 81 more8 hr
Apr 16, 4:59 PM CDTMesoscale DiscussionSPCAngelina, Cherokee, Gregg, Hardin, Houston, Jasper and 12 more91 min
Apr 16, 6:19 PM CDTMesoscale DiscussionSPCAnderson, Aransas, Austin, Bastrop, Bell, Bexar and 84 more86 min

Nearby

Tornado Watches in Texas, 2015Tornado Watches in Oklahoma, 2015Every tornado 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.