Alert archive / Oklahoma / Severe Thunderstorm Watches in 2020

Severe Thunderstorm Watch 201

May 22, 202027 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at May 22, 2020, 5:01 AM CDT for 27 counties in Oklahoma. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 22, 2020, 5:01 AM CDT (10:01 UTC)
Expired
May 22, 2020, 10:41 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1 in
Strongest gust expected
70 kt
All 27 counties

Adair County, OK, Atoka County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Creek County, OK, Haskell County, OK, Hughes County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Pushmataha County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK

The radar

The Tulsa radar (KINX), 68 km from the middle of the area, began a volume at 10:02 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
70%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
5%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 22, 5:03 AM CDTSevere Thunderstorm WarningTSAOsage, Pawnee42 min
May 22, 5:07 AM CDTSevere Thunderstorm WarningOUNCleveland, Lincoln, Logan, Noble, Oklahoma, Payne and 2 more38 min
May 22, 5:35 AM CDTSevere Thunderstorm WarningTSACreek, Okfuskee, Osage, Pawnee, Tulsa40 min
May 22, 5:39 AM CDTSevere Thunderstorm WarningOUNCleveland, Lincoln, Oklahoma, Payne, Pottawatomie, Seminole51 min
May 22, 5:53 AM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Grady, McClain, Murray, Stephens52 min
May 22, 6:09 AM CDTSevere Thunderstorm WarningTSACreek, Okfuskee, Okmulgee, Osage, Pawnee, Rogers and 3 more66 min
May 22, 6:22 AM CDTSevere Thunderstorm WarningOUNCleveland, McClain, Pottawatomie35 min
May 22, 6:24 AM CDTSevere Thunderstorm WarningOUNHughes, Lincoln, Pottawatomie, Seminole51 min
May 22, 6:41 AM CDTSevere Thunderstorm WarningOUNGarvin, McClain, Murray, Pontotoc, Pottawatomie, Seminole49 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 00:00Z, 10.0 hours before the alert went out and 130 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, Norman, OK at 00:00Z on 2020-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 922 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2020-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
922 J/kg
Mixed-layer CIN
-99 J/kg
Mixed-layer LCL
885 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
130 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.9

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 21, 9:10 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Ellis, Harper, Texas, Woods and 1 more65 min
May 21, 9:49 PM CDTSevere Thunderstorm WatchSPCAlfalfa, Beaver, Blaine, Canadian, Dewey, Ellis and 14 more8 hr
May 21, 11:28 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Harper, Woods, Woodward2 hr
May 22, 3:51 AM CDTMesoscale DiscussionSPCBlaine, Canadian, Custer, Dewey, Garfield, Grant and 8 more84 min
May 22, 9:15 AM CDTMesoscale DiscussionSPCLeFlore90 min
May 22, 1:27 PM CDTSevere Thunderstorm WatchSPCCarter, Comanche, Cotton, Garvin, Jefferson, Love and 3 more6 hr
May 22, 4:55 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Choctaw, Coal, Comanche and 17 more2 hr
May 22, 6:20 PM CDTMesoscale DiscussionSPCCotton, Jefferson, Love115 min

Nearby

Severe Thunderstorm Watches in Oklahoma, 2020Every 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.