Alert archive / Nebraska / Tornado Watches in 2020

Tornado Watch 273

June 9, 202012 counties in Kansas; 21 counties in Nebraska

The Storm Prediction Center issued this tornado watch at Jun 9, 2020, 2:36 PM CDT for 12 counties in Kansas; 21 counties in Nebraska. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 9, 2020, 2:36 PM CDT (19:36 UTC)
Expired
Jun 9, 2020, 9:33 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 33 counties

Brown County, KS, Clay County, KS, Cloud County, KS, Jackson County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Washington County, KS, Butler County, NE, Cass County, NE, Clay County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 120 km from the middle of the area, began a volume at 19:36 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
80%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
70%
One or more hailstones of 2 inches or more
60%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 9, 3:42 PM CDTSevere Thunderstorm WarningGIDFillmore, Thayer48 min
Jun 9, 3:45 PM CDTSevere Thunderstorm WarningOAXColfax, Dodge, Saunders45 min
Jun 9, 4:51 PM CDTSevere Thunderstorm WarningTOPRepublic24 min
Jun 9, 4:56 PM CDTSevere Thunderstorm WarningGIDClay, Fillmore, Nuckolls, Thayer49 min
Jun 9, 5:11 PM CDTSevere Thunderstorm WarningTOPRepublic34 min
Jun 9, 5:22 PM CDTSevere Thunderstorm WarningGIDThayer38 min
Jun 9, 5:28 PM CDTSevere Thunderstorm WarningTOPMarshall, Pottawatomie, Riley32 min
Jun 9, 5:31 PM CDTSevere Thunderstorm WarningTOPRepublic14 min
Jun 9, 5:47 PM CDTSevere Thunderstorm WarningTOPMarshall, Nemaha43 min
Jun 9, 5:53 PM CDTSevere Thunderstorm WarningOAXJefferson22 min
Jun 9, 5:57 PM CDTTornado WarningOAXJefferson33 min
Jun 9, 6:01 PM CDTSevere Thunderstorm WarningGIDFillmore, Thayer44 min
Jun 9, 6:10 PM CDTSevere Thunderstorm WarningOAXJefferson, Saline35 min
Jun 9, 6:13 PM CDTSevere Thunderstorm WarningOAXGage, Jefferson, Saline32 min
Jun 9, 6:16 PM CDTTornado WarningOAXJefferson, Saline29 min
Jun 9, 6:22 PM CDTSevere Thunderstorm WarningOAXButler, Saunders23 min
Jun 9, 6:26 PM CDTTornado WarningTOPMarshall, Nemaha34 min
Jun 9, 6:31 PM CDTTornado WarningOAXGage, Jefferson, Saline29 min
Jun 9, 6:38 PM CDTSevere Thunderstorm WarningOAXGage, Lancaster, Saline, Seward37 min
Jun 9, 6:42 PM CDTSevere Thunderstorm WarningOAXPawnee48 min
Jun 9, 6:58 PM CDTSevere Thunderstorm WarningTOPMarshall, Nemaha17 min
Jun 9, 7:00 PM CDTSevere Thunderstorm WarningOAXCass, Gage, Lancaster, Otoe30 min
Jun 9, 7:10 PM CDTTornado WarningOAXPawnee35 min
Jun 9, 7:17 PM CDTFlash Flood WarningOAXLancaster2 hr
Jun 9, 7:28 PM CDTSevere Thunderstorm WarningOAXCass, Lancaster, Otoe32 min
Jun 9, 7:29 PM CDTSevere Thunderstorm WarningOAXNemaha, Richardson46 min
Jun 9, 7:31 PM CDTSevere Thunderstorm WarningOAXNemaha, Richardson44 min
Jun 9, 7:34 PM CDTSevere Thunderstorm WarningOAXJohnson, Nemaha, Pawnee, Richardson41 min
Jun 9, 7:53 PM CDTSevere Thunderstorm WarningOAXNemaha, Otoe34 min
Jun 9, 8:25 PM CDTSevere Thunderstorm WarningOAXCass, Otoe35 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, 7.6 hours before the alert went out and 125 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 2020-06-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 384 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 2020-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 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
384 J/kg
Mixed-layer CIN
-304 J/kg
Mixed-layer LCL
994 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
71 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 9, 2:03 PM CDTMesoscale DiscussionSPCClay, Cloud, Jewell, Mitchell, Ottawa, Republic and 2 more87 min
Jun 9, 6:43 PM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Jackson, Jefferson, Marshall and 3 more92 min
Jun 8, 7:16 PM CDTMesoscale DiscussionSPCBlaine, Custer, Logan, Loup, Rock59 min
Jun 8, 9:01 PM CDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 9 more119 min
Jun 8, 9:13 PM CDTMesoscale DiscussionSPCBlaine, Boyd, Brown, Keya Paha, Lincoln, Logan and 3 more2 hr
Jun 9, 12:46 AM CDTMesoscale DiscussionSPCArthur, Blaine, Boyd, Brown, Chase, Cherry and 23 more89 min

Nearby

Tornado Watches in Nebraska, 2020Tornado Watches in Kansas, 2020Every tornado 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.