Alert archive / Kansas / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 712

October 17, 200727 counties in Kansas; 18 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Oct 17, 2007, 2:59 PM CDT for 27 counties in Kansas; 18 counties in Nebraska. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Oct 17, 2007, 2:59 PM CDT (19:59 UTC)
Expired
Oct 17, 2007, 10:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 45 counties

Barton County, KS, Cloud County, KS, Decatur County, KS, Edwards County, KS, Ellis County, KS, Ellsworth County, KS, Graham County, KS, Jewell County, KS, Kiowa County, KS, Lincoln County, KS, McPherson County, KS, Mitchell County, KS, Norton County, KS, Osborne County, KS, Ottawa County, KS, Pawnee County, KS, Phillips County, KS, Reno County, KS, Republic County, KS, Rice County, KS, Rooks County, KS, Rush County, KS, Russell County, KS, Saline County, KS, Sheridan County, KS, Smith County, KS, Stafford County, KS, Adams County, NE, Buffalo County, NE, Clay County, NE, Dawson County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Gosper County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Kearney County, NE, Nuckolls County, NE, Phelps County, NE, Red Willow County, NE, Thayer County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 90 km from the middle of the area, began a volume at 20:01 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
40%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Oct 17, 3:53 PM CDTSevere Thunderstorm WarningGIDPhillips52 min
Oct 17, 4:34 PM CDTSevere Thunderstorm WarningGIDHarlan37 min
Oct 17, 4:35 PM CDTTornado WarningGIDPhillips40 min
Oct 17, 4:54 PM CDTSevere Thunderstorm WarningGIDPhillips66 min
Oct 17, 5:19 PM CDTSevere Thunderstorm WarningGIDSmith30 min
Oct 17, 5:47 PM CDTSevere Thunderstorm WarningGIDFranklin28 min
Oct 17, 6:00 PM CDTSevere Thunderstorm WarningGIDWebster45 min
Oct 17, 6:06 PM CDTSevere Thunderstorm WarningGIDOsborne, Phillips, Rooks, Smith21 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.0 hours before the alert went out and 212 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, N. Platte/Lee Bi, NE at 12:00Z on 2007-10-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 387 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, N. Platte/Lee Bi, NE at 12:00Z on 2007-10-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 164 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
387 J/kg
Mixed-layer CIN
-173 J/kg
Mixed-layer LCL
498 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
164 m²/s²
0-3 km storm-relative helicity
162 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
Oct 17, 1:12 AM CDTMesoscale DiscussionSPCBarber, Clark, Comanche, Edwards, Finney, Ford and 13 more93 min
Oct 17, 1:44 AM CDTSevere Thunderstorm WatchSPCBarber, Clark, Comanche, Edwards, Ellis, Finney and 21 more7 hr
Oct 17, 4:07 AM CDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Bourbon, Brown, Butler and 52 more113 min
Oct 17, 6:50 AM CDTMesoscale DiscussionSPCClark, Comanche, Edwards, Ford, Gray, Hodgeman and 9 more100 min
Oct 17, 10:24 AM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Butler, Chase, Chautauqua and 25 more96 min
Oct 17, 10:43 AM CDTTornado WatchSPCAllen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 8 more7 hr
Oct 17, 12:58 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Comanche, Edwards, Ellis and 16 more92 min
Oct 17, 2:25 PM CDTTornado WatchSPCBarber, Chautauqua, Cowley, Elk, Harper, Kingman and 4 more8 hr
Oct 17, 5:30 PM CDTTornado WatchSPCBourbon, Cherokee, Crawford6 hr
Oct 17, 5:44 PM CDTMesoscale DiscussionSPCBarton, Cloud, Decatur, Edwards, Ellis, Ellsworth and 22 more61 min
Oct 17, 6:23 PM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Butler, Chase, Chautauqua and 32 more37 min

Nearby

Severe Thunderstorm Watches in Kansas, 2007Severe Thunderstorm Watches in Nebraska, 2007Every severe thunderstorm watch in 2007

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.