Alert archive / Oklahoma / Severe Thunderstorm Watches in 2020

Severe Thunderstorm Watch 1

January 10, 202014 counties in Kansas; 18 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at Jan 10, 2020, 7:44 AM CST for 14 counties in Kansas; 18 counties in Oklahoma. It was in force for 67 days.

The area

The outline as issued.

The facts

Issued: Jan 10, 2020, 7:44 AM CST (13:44 UTC)
Expired: Mar 17, 2020, 3:58 PM CDT
In force: 67 days
Issued by: the Storm Prediction Center
Largest hail expected: 2 in
Strongest gust expected: 50 kt

All 32 counties

Allen County, KS, Butler County, KS, Chautauqua County, KS, Cowley County, KS, Elk County, KS, Greenwood County, KS, Harper County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Sedgwick County, KS, Sumner County, KS, Wilson County, KS, Woodson County, KS, Alfalfa County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Nowata County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Roger Mills County, OK, Washington County, OK, Woods County, OK

The radar

The Vance AFB radar (KVNX), 47 km from the middle of the area, began a volume at 13:46 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: 20%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 20%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 60%
One or more hailstones of 2 inches or more: 30%
Six or more combined severe hail and wind reports: 70%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jan 10, 7:57 AM CST	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Roger Mills, Woodward	33 min
Jan 10, 8:03 AM CST	Severe Thunderstorm Warning	OUN	Dewey, Major, Woods	42 min
Jan 10, 8:23 AM CST	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	18 min
Jan 10, 8:39 AM CST	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	51 min
Jan 10, 9:23 AM CST	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Kingfisher	52 min
Jan 10, 10:15 AM CST	Severe Thunderstorm Warning	ICT	Harper, Sumner	33 min
Jan 10, 10:20 AM CST	Severe Thunderstorm Warning	OUN	Garfield, Grant	40 min
Jan 10, 10:33 AM CST	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major	42 min
Jan 10, 11:19 AM CST	Severe Thunderstorm Warning	ICT	Cowley, Sumner	35 min
Jan 10, 11:35 AM CST	Severe Thunderstorm Warning	TSA	Rogers, Tulsa, Washington	25 min
Jan 10, 1:14 PM CST	Severe Thunderstorm Warning	TSA	Craig, Nowata	27 min
Jan 10, 1:22 PM CST	Tornado Warning	TSA	Craig, Nowata	16 min
Mar 11, 2:20 AM CDT	Severe Thunderstorm Warning	ICT	Butler, Chase, Harvey, Marion	55 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

Norman, OK (KOUN), launched 12:00Z, 1.7 hours before the alert went out and 148 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: 927 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 595 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 208 m²/s²
0-3 km storm-relative helicity: 234 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 5.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 10, 6:30 AM CST	Mesoscale Discussion	SPC	Harper, Sumner	60 min
Jan 10, 9:12 AM CST	Mesoscale Discussion	SPC	Chautauqua, Montgomery	93 min
Jan 10, 12:11 PM CST	Mesoscale Discussion	SPC	Allen, Bourbon, Cherokee, Crawford, Labette, Montgomery and 2 more	2 hr
Jan 10, 12:54 PM CST	Mesoscale Discussion	SPC	Atchison, Brown, Chase, Clay, Dickinson, Doniphan and 19 more	6 hr
Jan 10, 1:21 PM CST	Mesoscale Discussion	SPC	Butler, Chautauqua, Cowley, Elk, Greenwood, Labette and 5 more	54 min
Jan 10, 10:42 AM CST	Tornado Watch	SPC	Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 38 more	10 hr
Jan 10, 11:47 AM CST	Mesoscale Discussion	SPC	Bryan, Choctaw	118 min
Jan 10, 1:44 PM CST	Mesoscale Discussion	SPC	Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 19 more	91 min
Jan 10, 4:55 PM CST	Mesoscale Discussion	SPC	Atoka, Bryan, Choctaw, Haskell, Latimer, LeFlore and 2 more	2 hr
Jan 10, 5:34 PM CST	Tornado Watch	SPC	McCurtain	11 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 2020 Severe Thunderstorm Watches in Kansas, 2020 Every severe thunderstorm watch in 2020

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.