Alert archive / Oklahoma / Tornado Watches in 2019

Tornado Watch 148

May 7, 201917 counties in Oklahoma

The Storm Prediction Center issued this tornado watch at May 7, 2019, 5:38 PM CDT for 17 counties in Oklahoma. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2019, 5:38 PM CDT (22:38 UTC)
Expired
May 7, 2019, 9:19 PM CDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
65 kt

Counties Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Noble County, OK, Roger Mills County, OK, Tillman County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 110 km from the middle of the area, began a volume at 22:39 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
60%
One or more EF2 to EF5 tornadoes
40%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
60%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
60%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 7, 6:39 PM CDTSevere Thunderstorm WarningOUNCuster, Washita51 min
May 7, 6:50 PM CDTSevere Thunderstorm WarningOUNRoger Mills40 min
May 7, 7:02 PM CDTTornado WarningOUNRoger Mills43 min
May 7, 7:22 PM CDTSevere Thunderstorm WarningOUNCuster14 min
May 7, 7:29 PM CDTSevere Thunderstorm WarningOUNEllis, Roger Mills46 min
May 7, 7:34 PM CDTSevere Thunderstorm WarningOUNBeckham41 min
May 7, 7:39 PM CDTSevere Thunderstorm WarningOUNCuster51 min
May 7, 7:52 PM CDTTornado WarningOUNBeckham, Harmon38 min
May 7, 7:56 PM CDTSevere Thunderstorm WarningOUNDewey, Major, Woods, Woodward26 min
May 7, 8:05 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer, Harmon40 min
May 7, 8:06 PM CDTSevere Thunderstorm WarningOUNBeckham, Roger Mills39 min
May 7, 8:13 PM CDTSevere Thunderstorm WarningOUNDewey, Ellis, Woodward47 min
May 7, 8:18 PM CDTSevere Thunderstorm WarningOUNHarmon27 min
May 7, 8:20 PM CDTTornado Warning Tornado observedOUNBeckham40 min
May 7, 8:21 PM CDTSevere Thunderstorm WarningOUNCuster, Dewey39 min
May 7, 8:27 PM CDTTornado WarningOUNGreer, Harmon48 min
May 7, 8:35 PM CDTTornado WarningOUNCuster, Dewey25 min
May 7, 8:42 PM CDTSevere Thunderstorm WarningOUNHarmon, Jackson48 min
May 7, 8:49 PM CDTTornado WarningOUNGreer, Harmon, Jackson41 min
May 7, 8:57 PM CDTSevere Thunderstorm WarningOUNBeckham, Custer, Roger Mills48 min
May 7, 9:00 PM CDTSevere Thunderstorm WarningOUNDewey, Ellis, Roger Mills, Woodward45 min
May 7, 9:11 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer49 min

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, 10.6 hours before the alert went out and 237 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 2019-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 334 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 2019-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 square meters per square second.193958Sfc1 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
334 J/kg
Mixed-layer CIN
-280 J/kg
Mixed-layer LCL
2060 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 6, 8:50 PM CDTMesoscale DiscussionSPCBeaver, Harper, Texas, Woods55 min
May 6, 10:18 PM CDTMesoscale DiscussionSPCCraig, Nowata, Ottawa57 min
May 6, 11:50 PM CDTMesoscale DiscussionSPCCraig, Delaware, Mayes55 min
May 7, 11:04 AM CDTMesoscale DiscussionSPCBeaver, Harper, Texas116 min
May 7, 1:28 PM CDTTornado WatchSPCBeaver, Texas9 hr
May 7, 2:11 PM CDTMesoscale DiscussionSPCGrant, Kay2 hr
May 7, 3:31 PM CDTTornado WatchSPCAlfalfa, Ellis, Grant, Harper, Kay, Woods and 1 more6 hr
May 7, 3:41 PM CDTMesoscale DiscussionSPCBeaver94 min
May 7, 4:47 PM CDTTornado WatchSPCCimarron5 hr
May 7, 5:24 PM CDTMesoscale DiscussionSPCBeckham, Custer, Dewey, Ellis, Greer, Kiowa and 3 more66 min
May 7, 5:36 PM CDTMesoscale DiscussionSPCBeaver, Texas54 min
May 7, 6:01 PM CDTMesoscale DiscussionSPCAlfalfa, Grant, Harper, Woods89 min

Nearby

Tornado Watches in Oklahoma, 2019Every tornado watch in 2019

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.