Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 629

April 21, 20057 counties in Kansas; 15 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2005, 1:48 PM CDT for 7 counties in Kansas; 15 counties in Nebraska. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Apr 21, 2005, 1:48 PM CDT (18:48 UTC)
Expired
Apr 21, 2005, 3:15 PM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 22 counties

Atchison County, KS, Jackson County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Riley County, KS, Washington County, KS, Fillmore County, NE, Gage County, NE, Garfield County, NE, Greeley County, NE, Hamilton County, NE, Howard County, NE, Jefferson County, NE, Loup County, NE, Merrick County, NE, Nance County, NE, Pawnee County, NE, Saline County, NE, Thayer County, NE, Valley County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 69 km from the middle of the area, began a volume at 18:51 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

Omaha, NE (KOAX), launched 12:00Z, 6.8 hours before the alert went out and 144 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, Omaha, NE at 12:00Z on 2005-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 51 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, Omaha, NE at 12:00Z on 2005-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -238 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
51 J/kg
Mixed-layer CIN
-375 J/kg
Mixed-layer LCL
777 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
-238 m²/s²
0-3 km storm-relative helicity
-180 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
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, 12:48 AM CDTMesoscale DiscussionSPCCheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 4 more57 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, 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.