Alert archive / Colorado / Mesoscale Discussions in 2007

Mesoscale Discussion 686

May 4, 200710 counties in Colorado; 7 counties in Kansas; 4 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 4, 2007, 4:07 PM MDT for 10 counties in Colorado; 7 counties in Kansas; 4 counties in Nebraska. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
May 4, 2007, 4:07 PM MDT (22:07 UTC)
Expired
May 4, 2007, 5:30 PM MDT
In force
83 min
Issued by
the Storm Prediction Center
All 21 counties

Bent County, CO, Cheyenne County, CO, Crowley County, CO, Kiowa County, CO, Kit Carson County, CO, Lincoln County, CO, Phillips County, CO, Prowers County, CO, Washington County, CO, Yuma County, CO, Cheyenne County, KS, Greeley County, KS, Logan County, KS, Rawlins County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Chase County, NE, Dundy County, NE, Hayes County, NE, Hitchcock County, NE

The radar

The Goodland radar (KGLD), 39 km from the middle of the area, began a volume at 22:10 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.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.1 hours before the alert went out and 104 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 2007-05-04Temperature 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 2007-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
1377 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
69 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 3, 6:34 PM MDTMesoscale DiscussionSPCLogan, Morgan, Phillips, Sedgwick, Weld26 min
May 3, 6:43 PM MDTTornado WatchSPCAdams, Arapahoe, Logan, Morgan, Phillips, Sedgwick and 3 more5 hr
May 3, 8:57 PM MDTMesoscale DiscussionSPCCheyenne, Elbert, Kit Carson, Lincoln, Logan, Morgan and 4 more93 min
May 4, 5:36 PM MDTTornado WatchSPCCheyenne, Elbert, Kit Carson, Lincoln, Logan, Morgan and 4 more7 hr
May 4, 1:53 PM MDTMesoscale DiscussionSPCBarber, Barton, Clark, Comanche, Edwards, Ellis and 27 more2 hr
May 4, 5:13 PM MDTTornado WatchSPCBarber, Barton, Clark, Comanche, Edwards, Ellis and 20 more8 hr
May 4, 12:19 PM MDTMesoscale DiscussionSPCAntelope, Boone, Boyd, Buffalo, Burt, Butler and 32 more86 min
May 4, 1:24 PM MDTTornado WatchSPCAntelope, Blaine, Boone, Boyd, Brown, Buffalo and 22 more7 hr
May 4, 5:20 PM MDTMesoscale DiscussionSPCAntelope, Blaine, Boone, Boyd, Cedar, Custer and 16 more85 min

Nearby

Mesoscale Discussions in Colorado, 2007Mesoscale Discussions in Kansas, 2007Mesoscale Discussions in Nebraska, 2007Every mesoscale discussion in 2007

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.