Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 706

May 5, 200714 counties in Nebraska; 5 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 5, 2007, 12:45 PM MDT for 14 counties in Nebraska; 5 counties in South Dakota. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 5, 2007, 12:45 PM MDT (18:45 UTC)
Expired
May 5, 2007, 2:45 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Arthur County, NE, Box Butte County, NE, Cherry County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, McPherson County, NE, Morrill County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Bennett County, SD, Jackson County, SD, Mellette County, SD, Oglala Lakota County, SD, Todd County, SD

The radar

The North Platte radar (KLNX), 123 km from the middle of the area, began a volume at 18:48 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 6.8 hours before the alert went out and 168 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, N. Platte/Lee Bi, NE at 12:00Z on 2007-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 175 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 12:00Z on 2007-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 138 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
175 J/kg
Mixed-layer CIN
-216 J/kg
Mixed-layer LCL
820 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
138 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.2

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 4, 6:26 PM MDTTornado WatchSPCAdams, Blaine, Boyd, Brown, Buffalo, Clay and 28 more7 hr
May 4, 7:29 PM MDTMesoscale DiscussionSPCChase, Dundy, Hayes, Hitchcock, Perkins91 min
May 4, 7:49 PM MDTMesoscale DiscussionSPCAntelope, Cedar, Dixon, Knox, Madison, Pierce and 1 more56 min
May 4, 8:22 PM MDTTornado WatchSPCAntelope, Boone, Cedar, Knox, Pierce11 hr
May 4, 8:41 PM MDTMesoscale DiscussionSPCAdams, Blaine, Brown, Buffalo, Custer, Franklin and 16 more94 min
May 4, 9:34 PM MDTMesoscale DiscussionSPCButler, Colfax, Cuming, Dodge, Gage, Jefferson and 8 more56 min
May 4, 10:28 PM MDTMesoscale DiscussionSPCChase, Dundy, Hayes, Perkins92 min
May 5, 12:23 AM MDTMesoscale DiscussionSPCAdams, Antelope, Blaine, Boone, Brown, Buffalo and 52 more67 min
May 5, 12:30 AM MDTTornado WatchSPCAdams, Antelope, Arthur, Blaine, Boone, Boyd and 60 more7 hr
May 5, 2:00 AM MDTMesoscale DiscussionSPCAdams, Antelope, Arthur, Blaine, Boone, Boyd and 60 more90 min
May 5, 5:59 AM MDTMesoscale DiscussionSPCAdams, Antelope, Boone, Buffalo, Butler, Cedar and 41 more61 min
May 5, 7:52 AM MDTMesoscale DiscussionSPCFrontier, Furnas, Harlan, Hayes, Hitchcock, Red Willow53 min
May 5, 8:51 AM MDTTornado Watch PDSSPCAdams, Blaine, Boone, Buffalo, Chase, Clay and 34 more12 hr
May 5, 9:35 AM MDTMesoscale DiscussionSPCAntelope, Boyd, Brown, Burt, Cedar, Cherry and 13 more85 min
May 5, 9:55 AM MDTTornado WatchSPCAntelope, Boyd, Brown, Cedar, Dakota, Dixon and 7 more6 hr
May 5, 10:32 AM MDTMesoscale DiscussionSPCAdams, Buffalo, Dawson, Franklin, Furnas, Gosper and 4 more88 min
May 5, 12:01 PM MDTMesoscale DiscussionSPCBoyd, Cedar, Dakota, Dixon, Holt, Knox and 2 more89 min
May 5, 1:32 PM MDTMesoscale DiscussionSPCButler, Cass, Colfax, Cuming, Dodge, Fillmore and 14 more28 min
May 5, 1:42 PM MDTTornado Watch PDSSPCBurt, Butler, Cass, Colfax, Cuming, Dodge and 20 more7 hr
May 5, 3:09 PM MDTMesoscale DiscussionSPCBoyd, Cedar, Dakota, Dixon, Holt, Keya Paha and 4 more96 min
May 5, 3:33 PM MDTTornado Watch PDSSPCAntelope, Boyd, Brown, Cedar, Cherry, Dakota and 8 more6 hr

Nearby

Mesoscale Discussions in Nebraska, 2007Mesoscale Discussions in South Dakota, 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.