Alert archive / Colorado / Tornado Watches in 2014

Tornado Watch 510

September 29, 201414 counties in Colorado; 12 counties in Nebraska

The Storm Prediction Center issued this tornado watch at Sep 29, 2014, 2:01 PM MDT for 14 counties in Colorado; 12 counties in Nebraska. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Sep 29, 2014, 2:01 PM MDT (20:01 UTC)
Expired
Sep 29, 2014, 9:00 PM MDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 26 counties

Adams County, CO, Arapahoe County, CO, Cheyenne County, CO, Douglas County, CO, Elbert 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, Chase County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Grant County, NE, Keith County, NE, Kimball County, NE, Morrill County, NE, Perkins County, NE

The radar

The Denver radar (KFTG), 82 km from the middle of the area, began a volume at 20:03 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
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Sep 29, 2:04 PM MDTSevere Thunderstorm WarningBOUArapahoe, Douglas41 min
Sep 29, 2:39 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver66 min
Sep 29, 2:56 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert64 min
Sep 29, 3:06 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln39 min
Sep 29, 3:13 PM MDTTornado WarningBOUArapahoe, Elbert32 min
Sep 29, 3:26 PM MDTSevere Thunderstorm WarningBOUWashington49 min
Sep 29, 3:42 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln31 min
Sep 29, 3:48 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Morgan57 min
Sep 29, 3:59 PM MDTSevere Thunderstorm WarningBOULogan, Washington46 min
Sep 29, 4:29 PM MDTSevere Thunderstorm WarningBOULincoln, Washington46 min
Sep 29, 4:31 PM MDTSevere Thunderstorm WarningBOUMorgan44 min
Sep 29, 4:45 PM MDTSevere Thunderstorm WarningBOULogan, Sedgwick26 min
Sep 29, 5:17 PM MDTTornado WarningBOUMorgan, Weld28 min
Sep 29, 5:28 PM MDTSevere Thunderstorm WarningBOUWashington32 min
Sep 29, 5:30 PM MDTSevere Thunderstorm WarningCYSMorrill30 min
Sep 29, 6:05 PM MDTSevere Thunderstorm WarningGLDCheyenne, Kit Carson, Yuma55 min
Sep 29, 6:24 PM MDTSevere Thunderstorm WarningBOULogan, Washington66 min
Sep 29, 6:37 PM MDTSevere Thunderstorm WarningGLDCheyenne, Kit Carson, Yuma68 min
Sep 29, 7:12 PM MDTSevere Thunderstorm WarningGLDYuma63 min
Sep 29, 7:17 PM MDTSevere Thunderstorm WarningGLDKit Carson, Yuma58 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, 8.0 hours before the alert went out and 32 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 2014-09-29Temperature 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 2014-09-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -55 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
772 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
-55 m²/s²
0-3 km storm-relative helicity
-16 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
Sep 29, 11:56 AM MDTMesoscale DiscussionSPCBaca, Bent, Cheyenne, Costilla, Crowley, Custer and 8 more2 hr
Sep 29, 1:19 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Cheyenne, Denver, Elbert, Kit Carson and 8 more56 min
Sep 29, 1:33 PM MDTSevere Thunderstorm WatchSPCBaca, Bent, Crowley, Custer, El Paso, Fremont and 7 more7 hr
Sep 29, 2:54 PM MDTMesoscale DiscussionSPCBaca, Bent, Crowley, Huerfano, Kiowa, Las Animas and 3 more96 min
Sep 29, 4:52 PM MDTMesoscale DiscussionSPCCheyenne, Kit Carson, Lincoln, Logan, Morgan, Phillips and 3 more83 min

Nearby

Tornado Watches in Colorado, 2014Tornado Watches in Nebraska, 2014Every tornado 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.