Alert archive / Nebraska / Tornado Watches in 2009

Tornado Watch 440

June 17, 20094 states

The Storm Prediction Center issued this tornado watch at Jun 17, 2009, 12:52 PM CDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Jun 17, 2009, 12:52 PM CDT (17:52 UTC)
Expired
Jun 17, 2009, 9:00 PM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
4 in
Strongest gust expected
70 kt
All 68 counties

Adair County, IA, Adams County, IA, Cass County, IA, Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Jewell County, KS, Marshall County, KS, Nemaha County, KS, Phillips County, KS, Republic County, KS, Smith County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, DeKalb County, MO, Gentry County, MO, Holt County, MO, Nodaway County, MO, Worth County, MO, Adams County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Dawson County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Gage County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Webster County, NE, York County, NE

The radar

The Omaha radar (KOAX), 56 km from the middle of the area, began a volume at 17:53 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
50%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
70%
One or more gusts of 65 knots or more
50%
Ten or more severe hail reports
90%
One or more hailstones of 2 inches or more
80%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 17, 1:08 PM CDTSevere Thunderstorm WarningTOPMarshall52 min
Jun 17, 1:15 PM CDTSevere Thunderstorm WarningTOPRepublic, Washington45 min
Jun 17, 1:30 PM CDTSevere Thunderstorm WarningTOPNemaha45 min
Jun 17, 1:39 PM CDTSevere Thunderstorm WarningOAXGage, Jefferson66 min
Jun 17, 2:11 PM CDTSevere Thunderstorm WarningTOPBrown, Nemaha49 min
Jun 17, 2:11 PM CDTTornado WarningTOPMarshall, Washington34 min
Jun 17, 2:12 PM CDTTornado WarningOAXGage, Pawnee48 min
Jun 17, 2:22 PM CDTTornado WarningTOPBrown, Jackson, Nemaha38 min
Jun 17, 2:39 PM CDTTornado WarningTOPMarshall, Nemaha36 min
Jun 17, 2:42 PM CDTSevere Thunderstorm WarningOAXGage, Pawnee, Richardson63 min
Jun 17, 2:52 PM CDTSevere Thunderstorm WarningEAXAtchison, Doniphan38 min
Jun 17, 2:57 PM CDTTornado WarningTOPBrown, Jackson33 min
Jun 17, 3:07 PM CDTTornado WarningEAXAtchison28 min
Jun 17, 3:15 PM CDTTornado WarningTOPMarshall, Nemaha30 min
Jun 17, 3:30 PM CDTTornado WarningEAXAtchison, Doniphan30 min
Jun 17, 3:51 PM CDTSevere Thunderstorm WarningEAXDoniphan39 min
Jun 17, 3:55 PM CDTSevere Thunderstorm WarningOAXRichardson50 min
Jun 17, 3:58 PM CDTSevere Thunderstorm WarningEAXAtchison, Doniphan32 min
Jun 17, 4:26 PM CDTSevere Thunderstorm WarningEAXDoniphan49 min
Jun 17, 4:28 PM CDTSevere Thunderstorm WarningEAXDoniphan47 min
Jun 17, 4:46 PM CDTSevere Thunderstorm WarningEAXCaldwell, Clinton, Daviess, DeKalb29 min
Jun 17, 5:15 PM CDTSevere Thunderstorm WarningEAXBuchanan, Caldwell, Clinton, DeKalb30 min
Jun 17, 5:42 PM CDTSevere Thunderstorm WarningGIDBuffalo, Sherman48 min
Jun 17, 5:45 PM CDTSevere Thunderstorm WarningEAXCaldwell, Carroll, Clay, Clinton, DeKalb, Livingston and 1 more30 min
Jun 17, 5:59 PM CDTFlash Flood WarningEAXCaldwell, Clinton, Daviess, DeKalb, Ray4 hr
Jun 17, 6:11 PM CDTSevere Thunderstorm WarningGIDBuffalo49 min
Jun 17, 6:25 PM CDTTornado WarningGIDBuffalo, Sherman35 min
Jun 17, 6:45 PM CDTSevere Thunderstorm WarningGIDHoward, Sherman, Valley45 min
Jun 17, 6:46 PM CDTSevere Thunderstorm WarningGIDBuffalo, Hall, Howard, Sherman44 min
Jun 17, 6:56 PM CDTTornado WarningGIDBuffalo, Hall34 min
Jun 17, 7:08 PM CDTSevere Thunderstorm WarningGIDGreeley, Valley52 min
Jun 17, 7:21 PM CDTTornado WarningGIDBuffalo, Hall24 min
Jun 17, 7:43 PM CDTSevere Thunderstorm WarningGIDHall47 min
Jun 17, 7:55 PM CDTTornado WarningGIDHall35 min
Jun 17, 8:07 PM CDTSevere Thunderstorm WarningGIDHall, Hamilton, Merrick38 min
Jun 17, 8:09 PM CDTTornado WarningGIDHall36 min
Jun 17, 8:18 PM CDTTornado WarningGIDBuffalo, Sherman27 min
Jun 17, 8:28 PM CDTSevere Thunderstorm WarningGIDSherman47 min
Jun 17, 8:42 PM CDTTornado WarningGIDHall, Hamilton, Merrick33 min
Jun 17, 8:46 PM CDTSevere Thunderstorm Warning EmergencyGIDHall, Hamilton, Merrick44 min
Jun 17, 8:46 PM CDTTornado WarningGIDSherman29 min
Jun 17, 8:48 PM CDTSevere Thunderstorm WarningGIDHamilton, York42 min
Jun 17, 8:55 PM CDTSevere Thunderstorm WarningGIDHamilton50 min
Jun 17, 8:58 PM CDTTornado Warning EmergencyGIDHamilton32 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

Omaha, NE (KOAX), launched 12:00Z, 5.9 hours before the alert went out and 56 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, Omaha, NE at 12:00Z on 2009-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1476 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, Omaha, NE at 12:00Z on 2009-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 130 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
1476 J/kg
Mixed-layer CIN
-141 J/kg
Mixed-layer LCL
1342 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
130 m²/s²
0-3 km storm-relative helicity
146 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
Jun 16, 8:47 PM CDTMesoscale DiscussionSPCLyon, Sioux58 min
Jun 17, 2:47 PM CDTMesoscale DiscussionSPCAdair, Adams, Cass, Fremont, Mills, Montgomery and 5 more28 min
Jun 17, 5:43 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Buena Vista, Calhoun, Carroll and 28 more92 min
Jun 17, 6:21 PM CDTSevere Thunderstorm WatchSPCAdair, Audubon, Boone, Buena Vista, Calhoun, Carroll and 29 more7 hr
Jun 17, 6:44 PM CDTMesoscale DiscussionSPCBremer, Butler, Cerro Gordo, Chickasaw, Fayette, Floyd and 4 more31 min
Jun 16, 8:26 PM CDTSevere Thunderstorm WatchSPCAllen, Bourbon, Butler, Chautauqua, Cherokee, Cowley and 11 more3 hr
Jun 16, 10:48 PM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Butler, Chautauqua, Cherokee and 10 more87 min
Jun 17, 12:17 PM CDTMesoscale DiscussionSPCAtchison, Brown, Clay, Cloud, Jackson, Jewell and 12 more58 min
Jun 17, 2:29 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 5 more61 min
Jun 17, 3:09 PM CDTTornado WatchSPCJohnson, Leavenworth, Wyandotte7 hr
Jun 17, 3:30 PM CDTTornado WatchSPCCheyenne, Decatur, Norton, Rawlins, Sherman, Thomas8 hr
Jun 17, 3:55 PM CDTSevere Thunderstorm WatchSPCBarber, Clark, Comanche, Edwards, Ford, Kiowa and 4 more7 hr
Jun 17, 5:26 PM CDTMesoscale DiscussionSPCBarber, Clark, Comanche, Edwards, Ford, Kiowa and 4 more94 min
Jun 17, 3:07 PM CDTMesoscale DiscussionSPCBollinger, Cape Girardeau, Jefferson, Madison, Perry, Sainte Genevieve and 2 more23 min
Jun 17, 6:42 PM CDTMesoscale DiscussionSPCAudrain, Boone, Buchanan, Caldwell, Callaway, Carroll and 43 more2 hr
Jun 17, 5:02 PM CDTMesoscale DiscussionSPCBoyd, Cherry, Dawes, Holt, Keya Paha, Rock and 1 more88 min
Jun 17, 6:35 PM CDTSevere Thunderstorm WatchSPCCherry, Grant, Hooker, Sheridan, Thomas7 hr

Nearby

Tornado Watches in Nebraska, 2009Tornado Watches in Iowa, 2009Tornado Watches in Kansas, 2009Every tornado watch in 2009

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.