Alert archive / Colorado / Severe Thunderstorm Watches in 2013

Severe Thunderstorm Watch 85

April 8, 201313 counties in Colorado

The Storm Prediction Center issued this severe thunderstorm watch at Apr 8, 2013, 2:16 PM MDT for 13 counties in Colorado. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
Apr 8, 2013, 2:16 PM MDT (20:16 UTC)
Expired
Apr 8, 2013, 11:00 PM MDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt

Counties Bent County, CO, Cheyenne County, CO, Crowley County, CO, Kiowa County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Otero County, CO, Phillips County, CO, Prowers County, CO, Sedgwick County, CO, Washington County, CO, Yuma County, CO

The radar

The Goodland radar (KGLD), 105 km from the middle of the area, began a volume at 20:18 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
20%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
60%
One or more hailstones of 2 inches or more
50%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 8, 3:54 PM MDTSevere Thunderstorm WarningGLDKit Carson66 min
Apr 8, 4:26 PM MDTSevere Thunderstorm WarningBOUSedgwick34 min
Apr 8, 4:40 PM MDTSevere Thunderstorm WarningGLDKit Carson, Yuma65 min
Apr 8, 4:57 PM MDTSevere Thunderstorm WarningBOUWashington48 min
Apr 8, 5:22 PM MDTSevere Thunderstorm WarningGLDYuma53 min
Apr 8, 6:23 PM MDTTornado Warning Tornado observedGLDYuma22 min
Apr 8, 7:03 PM MDTSevere Thunderstorm WarningBOUMorgan, Washington27 min
Apr 8, 7:11 PM MDTTornado WarningGLDYuma34 min
Apr 8, 7:17 PM MDTTornado WarningBOUPhillips28 min
Apr 8, 7:24 PM MDTTornado WarningBOUWashington36 min
Apr 8, 7:34 PM MDTTornado WarningBOUMorgan, Washington26 min
Apr 8, 7:46 PM MDTSevere Thunderstorm WarningBOUPhillips29 min
Apr 8, 7:59 PM MDTTornado WarningBOUMorgan, Washington46 min
Apr 8, 8:06 PM MDTTornado WarningBOUWashington24 min
Apr 8, 8:14 PM MDTSevere Thunderstorm WarningGLDYuma61 min
Apr 8, 8:20 PM MDTSevere Thunderstorm WarningBOUPhillips, Sedgwick40 min
Apr 8, 8:33 PM MDTTornado WarningBOUWashington27 min
Apr 8, 8:52 PM MDTTornado WarningBOUWashington23 min
Apr 8, 8:57 PM MDTTornado WarningGLDYuma18 min
Apr 8, 9:00 PM MDTTornado WarningBOULogan, Phillips30 min
Apr 8, 9:17 PM MDTTornado WarningBOUWashington28 min
Apr 8, 9:31 PM MDTTornado WarningBOUPhillips29 min
Apr 8, 9:44 PM MDTSevere Thunderstorm WarningGLDYuma61 min
Apr 8, 9:45 PM MDTTornado WarningBOUWashington30 min
Apr 8, 10:01 PM MDTSevere Thunderstorm WarningBOUSedgwick29 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, 8.3 hours before the alert went out and 39 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 2013-04-08Temperature 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 2013-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.1939587897Sfc1 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
2481 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
58 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
Apr 8, 1:36 PM MDTMesoscale DiscussionSPCBent, Cheyenne, Kiowa, Kit Carson, Prowers, Washington and 1 more2 hr
Apr 8, 5:09 PM MDTMesoscale DiscussionSPCCheyenne, Kit Carson, Phillips, Sedgwick, Yuma66 min

Nearby

Severe Thunderstorm Watches in Colorado, 2013Every severe thunderstorm watch in 2013

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.