Alert archive / Nebraska / Severe Thunderstorm Watches in 2006

Severe Thunderstorm Watch 522

June 20, 200611 counties in Colorado; 25 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jun 20, 2006, 1:59 PM MDT for 11 counties in Colorado; 25 counties in Nebraska. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Jun 20, 2006, 1:59 PM MDT (19:59 UTC)
Expired
Jun 20, 2006, 10:00 PM MDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 36 counties

Adams County, CO, Arapahoe County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE

The radar

The Cheyenne radar (KCYS), 154 km from the middle of the area, began a volume at 19:59 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
2%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 20, 2:12 PM MDTSevere Thunderstorm WarningCYSKimball33 min
Jun 20, 2:19 PM MDTSevere Thunderstorm WarningCYSCheyenne41 min
Jun 20, 2:34 PM MDTSevere Thunderstorm WarningCYSBanner26 min
Jun 20, 3:16 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill43 min
Jun 20, 3:59 PM MDTSevere Thunderstorm WarningCYSBox Butte46 min
Jun 20, 4:15 PM MDTSevere Thunderstorm WarningLBFSheridan60 min
Jun 20, 4:16 PM MDTSevere Thunderstorm WarningBOULogan44 min
Jun 20, 4:20 PM MDTSevere Thunderstorm WarningCYSCheyenne40 min
Jun 20, 4:40 PM MDTSevere Thunderstorm WarningBOULincoln50 min
Jun 20, 4:52 PM MDTSevere Thunderstorm WarningLBFSheridan53 min
Jun 20, 4:55 PM MDTSevere Thunderstorm WarningBOULogan50 min
Jun 20, 5:03 PM MDTTornado WarningBOULogan42 min
Jun 20, 5:18 PM MDTTornado WarningLBFSheridan42 min
Jun 20, 5:20 PM MDTSevere Thunderstorm WarningBOUPhillips, Sedgwick40 min
Jun 20, 5:34 PM MDTSevere Thunderstorm WarningBOULincoln56 min
Jun 20, 5:42 PM MDTTornado WarningBOULogan, Phillips48 min
Jun 20, 5:59 PM MDTSevere Thunderstorm WarningGLDCheyenne, Kit Carson61 min
Jun 20, 6:06 PM MDTTornado WarningGLDYuma54 min
Jun 20, 6:27 PM MDTTornado WarningBOULogan, Phillips48 min
Jun 20, 6:31 PM MDTTornado WarningBOUWashington44 min
Jun 20, 6:52 PM MDTSevere Thunderstorm WarningGLDKit Carson53 min
Jun 20, 6:57 PM MDTSevere Thunderstorm WarningGLDCheyenne, Kit Carson39 min
Jun 20, 7:01 PM MDTSevere Thunderstorm WarningGLDYuma89 min
Jun 20, 7:16 PM MDTSevere Thunderstorm WarningBOUPhillips19 min
Jun 20, 7:34 PM MDTTornado WarningGLDYuma56 min
Jun 20, 8:30 PM MDTSevere Thunderstorm WarningGLDYuma38 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

Denver, CO (KDNR), launched 12:00Z, 8.0 hours before the alert went out and 182 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, Denver, CO at 12:00Z on 2006-06-20Temperature 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 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2006-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -85 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3074 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
-85 m²/s²
0-3 km storm-relative helicity
-17 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 19, 6:42 PM MDTMesoscale DiscussionSPCKit Carson, Logan, Morgan, Phillips, Sedgwick, Washington and 1 more93 min
Jun 20, 12:54 PM MDTMesoscale DiscussionSPCLogan, Sedgwick, Weld96 min
Jun 20, 1:56 PM MDTMesoscale DiscussionSPCBaca, Bent, Cheyenne, Kiowa, Prowers2 hr
Jun 20, 1:11 AM MDTMesoscale DiscussionSPCBoyd, Brown, Cedar, Cherry, Dixon, Holt and 5 more94 min
Jun 19, 10:19 PM MDTMesoscale DiscussionSPCWeston86 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2006Severe Thunderstorm Watches in Colorado, 2006Every severe thunderstorm watch in 2006

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.