Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 691

May 4, 20078 counties in Kansas; 22 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 4, 2007, 9:41 PM CDT for 8 counties in Kansas; 22 counties in Nebraska. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued
May 4, 2007, 9:41 PM CDT (02:41 UTC)
Expired
May 4, 2007, 11:15 PM CDT
In force
94 min
Issued by
the Storm Prediction Center
All 30 counties

Decatur County, KS, Graham County, KS, Norton County, KS, Osborne County, KS, Phillips County, KS, Rooks County, KS, Sheridan County, KS, Smith County, KS, Adams County, NE, Blaine County, NE, Brown County, NE, Buffalo County, NE, Custer County, NE, Franklin County, NE, Furnas County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Harlan County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Loup County, NE, Merrick County, NE, Phelps County, NE, Rock County, NE, Sherman County, NE, Valley County, NE, Webster County, NE, Wheeler County, NE

The radar

The Grand Island radar (KUEX), 95 km from the middle of the area, began a volume at 02:41 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 00:00Z, 2.7 hours before the alert went out and 111 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 00:00Z on 2007-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1008 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 00:00Z on 2007-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 110 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
1008 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
699 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
110 m²/s²
0-3 km storm-relative helicity
151 m²/s²
Significant tornado parameter
0.4
Supercell composite
3.9

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, 7:26 PM CDTTornado WatchSPCDecatur, Gove, Graham, Jewell, Mitchell, Norton and 5 more7 hr
May 4, 8:06 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Comanche, Edwards, Ford and 6 more84 min
May 4, 8:29 PM CDTMesoscale DiscussionSPCCheyenne, Sherman91 min
May 4, 10:34 PM CDTMesoscale DiscussionSPCClay, Dickinson, Geary, Marion, Marshall, Morris and 2 more56 min
May 4, 11:10 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Comanche, Edwards, Ellsworth and 12 more95 min
May 4, 11:28 PM CDTMesoscale DiscussionSPCCheyenne, Sherman, Wallace92 min
May 5, 1:23 AM CDTMesoscale DiscussionSPCBarton, Clay, Cloud, Decatur, Ellis, Ellsworth and 15 more67 min
May 5, 1:30 AM CDTTornado WatchSPCClay, Cloud, Dickinson, Ellsworth, Jewell, Lincoln and 10 more7 hr
May 5, 3:00 AM CDTMesoscale DiscussionSPCBarton, Clay, Cloud, Dickinson, Ellsworth, Jewell and 12 more90 min
May 5, 6:59 AM CDTMesoscale DiscussionSPCRepublic, Washington61 min
May 5, 8:52 AM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Cloud, Comanche, Decatur and 40 more53 min
May 5, 9:51 AM CDTTornado Watch PDSSPCBarton, Cheyenne, Decatur, Ellis, Ellsworth, Gove and 21 more12 hr
May 5, 11:32 AM CDTMesoscale DiscussionSPCNorton, Phillips, Smith88 min
May 5, 11:57 AM CDTMesoscale DiscussionSPCBarber, Clark, Comanche, Edwards, Harper, Kingman and 3 more93 min
May 5, 12:15 PM CDTTornado Watch PDSSPCBarber, Clark, Comanche, Edwards, Finney, Ford and 16 more10 hr
May 5, 2:32 PM CDTMesoscale DiscussionSPCClay, Cloud, Dickinson, Geary, Marshall, Morris and 5 more28 min
May 5, 2:42 PM CDTTornado Watch PDSSPCBrown, Chase, Clay, Cloud, Dickinson, Geary and 15 more7 hr
May 5, 3:26 PM CDTMesoscale DiscussionSPCBarton, Clark, Comanche, Edwards, Ellis, Ford and 14 more94 min
May 5, 6:16 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Cloud, Comanche, Edwards and 14 more59 min
May 4, 8:49 PM CDTMesoscale DiscussionSPCAntelope, Cedar, Dixon, Knox, Madison, Pierce and 1 more56 min
May 4, 9:22 PM CDTTornado WatchSPCAntelope, Boone, Cedar, Knox, Pierce11 hr
May 5, 10:35 AM CDTMesoscale DiscussionSPCAntelope, Boyd, Brown, Burt, Cedar, Cherry and 13 more85 min
May 5, 10:55 AM CDTTornado WatchSPCAntelope, Boyd, Brown, Cedar, Dakota, Dixon and 7 more6 hr
May 5, 1:01 PM CDTMesoscale DiscussionSPCBoyd, Cedar, Dakota, Dixon, Holt, Knox and 2 more89 min
May 5, 1:45 PM CDTMesoscale DiscussionSPCArthur, Box Butte, Cherry, Dawes, Deuel, Garden and 8 more2 hr
May 5, 4:09 PM CDTMesoscale DiscussionSPCBoyd, Cedar, Dakota, Dixon, Holt, Keya Paha and 4 more96 min
May 5, 4:33 PM CDTTornado Watch PDSSPCAntelope, Boyd, Brown, Cedar, Cherry, Dakota and 8 more6 hr

Nearby

Mesoscale Discussions in Nebraska, 2007Mesoscale Discussions in Kansas, 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.