Alert archive / Colorado / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 360

June 27, 201416 counties in Colorado; 8 counties in Nebraska; 4 counties in Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at Jun 27, 2014, 12:48 PM MDT for 16 counties in Colorado; 8 counties in Nebraska; 4 counties in Wyoming. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 27, 2014, 12:48 PM MDT (18:48 UTC)
Expired
Jun 27, 2014, 7:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 28 counties

Adams County, CO, Arapahoe County, CO, Bent County, CO, Cheyenne County, CO, Elbert County, CO, Kiowa County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Prowers County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 80 km from the middle of the area, began a volume at 18:49 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
10%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 27, 12:48 PM MDTSevere Thunderstorm WarningCYSLaramie42 min
Jun 27, 1:20 PM MDTSevere Thunderstorm WarningCYSLaramie40 min
Jun 27, 1:22 PM MDTSevere Thunderstorm WarningBOUWeld53 min
Jun 27, 1:50 PM MDTSevere Thunderstorm WarningBOUWeld27 min
Jun 27, 1:50 PM MDTSevere Thunderstorm WarningGLDCheyenne55 min
Jun 27, 1:53 PM MDTSevere Thunderstorm WarningPUBKiowa52 min
Jun 27, 2:09 PM MDTSevere Thunderstorm WarningBOUWeld66 min
Jun 27, 2:14 PM MDTSevere Thunderstorm WarningCYSBanner46 min
Jun 27, 2:21 PM MDTFlash Flood WarningCYSLaramie4 hr
Jun 27, 2:27 PM MDTTornado Warning Tornado observedGLDCheyenne23 min
Jun 27, 2:30 PM MDTTornado Warning Tornado observedPUBKiowa30 min
Jun 27, 2:38 PM MDTSevere Thunderstorm WarningBOUWeld41 min
Jun 27, 2:38 PM MDTSevere Thunderstorm WarningCYSBanner, Scotts Bluff52 min
Jun 27, 2:48 PM MDTFlash Flood WarningCYSBanner4 hr
Jun 27, 2:57 PM MDTSevere Thunderstorm WarningBOULincoln48 min
Jun 27, 3:08 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Elbert52 min
Jun 27, 3:14 PM MDTSevere Thunderstorm WarningGLDCheyenne46 min
Jun 27, 3:29 PM MDTFlash Flood WarningCYSBanner, Scotts Bluff6 hr
Jun 27, 3:47 PM MDTSevere Thunderstorm WarningGLDCheyenne, Kit Carson43 min
Jun 27, 3:53 PM MDTFlash Flood WarningCYSBanner, Kimball4 hr
Jun 27, 4:22 PM MDTSevere Thunderstorm WarningBOUMorgan, Washington22 min
Jun 27, 4:42 PM MDTSevere Thunderstorm WarningGLDYuma33 min
Jun 27, 4:52 PM MDTSevere Thunderstorm WarningBOUMorgan23 min
Jun 27, 6:26 PM MDTSevere Thunderstorm WarningBOUPhillips, Sedgwick34 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 (KDEN), launched 12:00Z, 6.8 hours before the alert went out and 148 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 2014-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 86 joules per kilogram.LCLLFCEL10008507005003002001001 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 2014-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -126 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
86 J/kg
Mixed-layer CIN
-324 J/kg
Mixed-layer LCL
1793 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-126 m²/s²
0-3 km storm-relative helicity
-41 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 26, 8:00 PM MDTMesoscale DiscussionSPCPhillips, Sedgwick, Yuma90 min
Jun 26, 9:39 PM MDTSevere Thunderstorm WatchSPCCheyenne, Kit Carson, Yuma3 hr
Jun 26, 10:55 PM MDTMesoscale DiscussionSPCKit Carson, Phillips, Yuma95 min
Jun 27, 12:05 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Cheyenne, Elbert, Kit Carson, Lincoln and 7 more115 min
Jun 27, 2:19 PM MDTMesoscale DiscussionSPCPhillips, Sedgwick86 min
Jun 27, 2:47 PM MDTTornado WatchSPCCheyenne, Kit Carson, Yuma6 hr
Jun 27, 5:06 PM MDTMesoscale DiscussionSPCPhillips, Sedgwick84 min
Jun 27, 5:47 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Bent, Crowley, Elbert, Kiowa and 8 more58 min
Jun 27, 12:37 AM MDTMesoscale DiscussionSPCBuffalo, Custer, Dawson, Frontier, Furnas, Gosper and 7 more23 min
Jun 27, 3:57 PM MDTMesoscale DiscussionSPCBlaine, Brown, Cherry, Custer, Dawes, Garfield and 10 more93 min
Jun 27, 4:17 PM MDTSevere Thunderstorm WatchSPCArthur, Cherry, Garden, Grant, Hooker, Logan and 3 more6 hr
Jun 26, 8:13 PM MDTMesoscale DiscussionSPCCampbell, Crook, Weston62 min

Nearby

Severe Thunderstorm Watches in Colorado, 2014Severe Thunderstorm Watches in Nebraska, 2014Severe Thunderstorm Watches in Wyoming, 2014Every severe thunderstorm watch in 2014

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.