Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1491

July 3, 200420 counties in Kansas; 27 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 3, 2004, 9:41 PM CDT for 20 counties in Kansas; 27 counties in Nebraska. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued
Jul 3, 2004, 9:41 PM CDT (02:41 UTC)
Expired
Jul 3, 2004, 10:45 PM CDT
In force
64 min
Issued by
the Storm Prediction Center
All 47 counties

Clay County, KS, Cloud County, KS, Ellis County, KS, Gove County, KS, Graham County, KS, Jewell County, KS, Lincoln County, KS, Marshall County, KS, Mitchell County, KS, Osborne County, KS, Ottawa County, KS, Phillips County, KS, Republic County, KS, Riley County, KS, Rooks County, KS, Russell County, KS, Sheridan County, KS, Smith County, KS, Trego County, KS, Washington County, KS, Burt County, NE, Butler County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Fillmore County, NE, Gage County, NE, Hamilton County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Pawnee County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Wayne County, NE, York County, NE

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 00:00Z, 2.7 hours before the alert went out and 230 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 00:00Z on 2004-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1650 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 00:00Z on 2004-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 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
1650 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
1175 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.4

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
Jul 3, 10:10 PM CDTSevere Thunderstorm WatchSPCAtchison, Brown, Chase, Clay, Cloud, Coffey and 20 more6 hr
Jul 3, 10:25 PM CDTSevere Thunderstorm WatchSPCBarton, Dickinson, Ellis, Ellsworth, Geary, Gove and 17 more6 hr
Jul 4, 1:45 AM CDTMesoscale DiscussionSPCAtchison, Barton, Brown, Chase, Clay, Coffey and 31 more90 min
Jul 4, 2:55 AM CDTSevere Thunderstorm WatchSPCAllen, Anderson, Barber, Barton, Butler, Chase and 40 more5 hr
Jul 4, 5:05 AM CDTSevere Thunderstorm WatchSPCBourbon, Chautauqua, Cherokee, Crawford, Labette, Montgomery and 1 more5 hr
Jul 4, 6:08 AM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford, Labette, Montgomery, Neosho2 hr
Jul 4, 6:09 AM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford, Labette, Montgomery, Neosho2 hr
Jul 4, 2:15 PM CDTSevere Thunderstorm WatchSPCCheyenne, Decatur, Gove, Grant, Greeley, Hamilton and 12 more8 hr
Jul 4, 3:21 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Comanche, Edwards, Ford and 10 more84 min
Jul 4, 3:40 PM CDTSevere Thunderstorm WatchSPCBarber, Barton, Clark, Comanche, Edwards, Ellis and 16 more6 hr
Jul 4, 5:24 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Finney, Gove, Grant, Greeley and 16 more96 min
Jul 4, 1:28 PM CDTMesoscale DiscussionSPCArthur, Blaine, Box Butte, Chase, Cherry, Deuel and 13 more2 hr

Nearby

Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in Kansas, 2004Every mesoscale discussion in 2004

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.