Alert archive / Kansas / Tornado Watches in 2010

Tornado Watch 152

May 11, 201023 counties in Kansas; 10 counties in Oklahoma

The Storm Prediction Center issued this tornado watch at May 11, 2010, 8:11 PM CDT for 23 counties in Kansas; 10 counties in Oklahoma. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
May 11, 2010, 8:11 PM CDT (01:11 UTC)
Expired
May 12, 2010, 4:00 AM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 33 counties

Barber County, KS, Barton County, KS, Butler County, KS, Chase County, KS, Comanche County, KS, Cowley County, KS, Edwards County, KS, Ellsworth County, KS, Greenwood County, KS, Harper County, KS, Harvey County, KS, Kingman County, KS, Kiowa County, KS, Marion County, KS, McPherson County, KS, Pawnee County, KS, Pratt County, KS, Reno County, KS, Rice County, KS, Saline County, KS, Sedgwick County, KS, Stafford County, KS, Sumner County, KS, Alfalfa County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Kay County, OK, Major County, OK, Noble County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 61 km from the middle of the area, began a volume at 01:14 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
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
80%
One or more hailstones of 2 inches or more
50%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 11, 8:21 PM CDTTornado WarningOUNWoodward39 min
May 11, 8:58 PM CDTTornado WarningOUNWoodward35 min
May 12, 1:11 AM CDTSevere Thunderstorm WarningDDCEdwards, Ford, Hodgeman, Pawnee64 min
May 12, 3:00 AM CDTSevere Thunderstorm WarningICTBarton, Reno, Rice46 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

Dodge City, (KDDC), launched 00:00Z, 1.2 hours before the alert went out and 142 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, Dodge City, at 00:00Z on 2010-05-12Temperature 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, Dodge City, at 00:00Z on 2010-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1434 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
272 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 11, 7:54 PM CDTMesoscale DiscussionSPCBarber, Comanche, Harper, Kingman, Pratt, Sumner66 min
May 11, 8:40 PM CDTMesoscale DiscussionSPCAllen, Bourbon, Cherokee, Crawford, Labette, Montgomery and 3 more2 hr
May 11, 11:05 PM CDTMesoscale DiscussionSPCBarber, Barton, Butler, Chase, Chautauqua, Clark and 32 more25 min
May 11, 11:16 PM CDTSevere Thunderstorm WatchSPCAllen, Anderson, Barber, Barton, Bourbon, Butler and 54 more6 hr
May 12, 2:34 AM CDTMesoscale DiscussionSPCAllen, Anderson, Barber, Barton, Bourbon, Butler and 60 more56 min
May 12, 2:21 PM CDTMesoscale DiscussionSPCAllen, Anderson, Barber, Butler, Chase, Coffey and 21 more54 min
May 12, 2:41 PM CDTTornado WatchSPCAnderson, Butler, Chase, Coffey, Cowley, Dickinson and 20 more7 hr
May 12, 5:14 PM CDTMesoscale DiscussionSPCAnderson, Bourbon, Franklin, Johnson, Leavenworth, Linn and 2 more91 min
May 12, 5:40 PM CDTTornado WatchSPCJohnson, Leavenworth, Miami, Wyandotte6 hr
May 12, 6:59 PM CDTMesoscale DiscussionSPCBarber, Butler, Chase, Coffey, Cowley, Dickinson and 13 more61 min

Nearby

Tornado Watches in Kansas, 2010Tornado Watches in Oklahoma, 2010Every tornado watch in 2010

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.