Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 622

April 21, 200510 counties in Kansas; 33 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2005, 12:48 AM CDT for 10 counties in Kansas; 33 counties in Nebraska. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 21, 2005, 12:48 AM CDT (05:48 UTC)
Expired
Apr 21, 2005, 1:45 AM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 43 counties

Cheyenne County, KS, Decatur County, KS, Graham County, KS, Norton County, KS, Phillips County, KS, Rawlins County, KS, Rooks County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Arthur County, NE, Blaine County, NE, Brown County, NE, Buffalo County, NE, Chase County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Grant County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Kearney County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Phelps County, NE, Red Willow County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE

The radar

The North Platte radar (KLNX), 156 km from the middle of the area, began a volume at 05:56 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, 5.8 hours before the alert went out and 65 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 2005-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 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 2005-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 239 square meters per square second.193958Sfc1 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
2 J/kg
Mixed-layer CIN
-405 J/kg
Mixed-layer LCL
582 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
239 m²/s²
0-3 km storm-relative helicity
364 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

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
Apr 20, 7:25 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Gove, Logan, Norton, Rawlins and 4 more95 min
Apr 20, 9:29 PM CDTMesoscale DiscussionSPCClay, Cloud, Dickinson, Geary, Jackson, Jewell and 13 more61 min
Apr 20, 9:45 PM CDTSevere Thunderstorm WatchSPCAtchison, Brown, Clay, Cloud, Dickinson, Douglas and 21 more7 hr
Apr 20, 9:51 PM CDTMesoscale DiscussionSPCBarber, Clark, Comanche, Edwards, Ford, Kingman and 4 more84 min
Apr 20, 11:00 PM CDTSevere Thunderstorm WatchSPCCheyenne, Decatur, Rawlins6 hr
Apr 20, 11:50 PM CDTMesoscale DiscussionSPCBrown, Clay, Cloud, Ellis, Geary, Jackson and 15 more85 min
Apr 21, 1:00 AM CDTSevere Thunderstorm WatchSPCCheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 4 more4 hr
Apr 21, 3:34 AM CDTMesoscale DiscussionSPCBrown, Doniphan116 min
Apr 21, 11:13 AM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Jackson, Jefferson, Marshall and 4 more2 hr
Apr 21, 11:35 AM CDTTornado WatchSPCClay, Cloud, Jackson, Jewell, Marshall, Nemaha and 4 more5 hr
Apr 21, 1:45 PM CDTSevere Thunderstorm WatchSPCBourbon, Cherokee, Crawford, Linn5 hr
Apr 21, 1:48 PM CDTMesoscale DiscussionSPCAtchison, Jackson, Marshall, Nemaha, Pottawatomie, Riley and 1 more87 min
Apr 21, 3:05 PM CDTMesoscale DiscussionSPCAnderson, Atchison, Brown, Doniphan, Douglas, Franklin and 11 more85 min
Apr 21, 3:35 PM CDTTornado WatchSPCAnderson, Atchison, Brown, Doniphan, Douglas, Franklin and 11 more7 hr
Apr 21, 4:51 PM CDTMesoscale DiscussionSPCAtchison54 min
Apr 21, 5:52 PM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Douglas, Jackson, Jefferson and 5 more53 min
Apr 21, 6:10 PM CDTTornado WatchSPCBourbon, Cherokee, Crawford, Linn7 hr
Apr 21, 6:51 PM CDTMesoscale DiscussionSPCAtchison, Brown, Doniphan, Douglas, Franklin, Jackson and 7 more84 min
Apr 20, 8:35 PM CDTSevere Thunderstorm WatchSPCDeuel6 hr
Apr 20, 11:45 PM CDTSevere Thunderstorm WatchSPCAdams, Cass, Clay, Fillmore, Gage, Hall and 13 more5 hr

Nearby

Mesoscale Discussions in Nebraska, 2005Mesoscale Discussions in Kansas, 2005Every mesoscale discussion in 2005

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.