Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1557

July 7, 200416 counties in Kansas; Atchison County, Buchanan County, Holt County, Missouri; 25 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2004, 12:19 PM CDT for 16 counties in Kansas; Atchison County, Buchanan County, Holt County, Missouri; 25 counties in Nebraska. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Jul 7, 2004, 12:19 PM CDT (17:19 UTC)
Expired: Jul 7, 2004, 1:15 PM CDT
In force: 56 min
Issued by: the Storm Prediction Center

All 44 counties

Atchison County, KS, Brown County, KS, Clay County, KS, Cloud County, KS, Doniphan County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Shawnee County, KS, Wabaunsee County, KS, Washington County, KS, Atchison County, MO, Buchanan County, MO, Holt County, MO, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Fillmore County, NE, Gage County, NE, Hamilton County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Platte County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, York County, NE

The radar

The Topeka radar (KTWX), 129 km from the middle of the area, began a volume at 17:23 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.

Severe Thunderstorm Watch 587Jul 7, 2:25 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 5.3 hours before the alert went out and 137 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1130 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 160 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.

Issued	Product	Office	Counties	Lasted
Jul 7, 2:06 PM CDT	Mesoscale Discussion	SPC	Barton, Chase, Cloud, Dickinson, Ellsworth, Jewell and 13 more	24 min
Jul 7, 2:25 PM CDT	Severe Thunderstorm Watch	SPC	Barton, Chase, Clay, Cloud, Dickinson, Ellsworth and 16 more	6 hr
Jul 7, 6:15 PM CDT	Mesoscale Discussion	SPC	Barber, Barton, Butler, Chase, Chautauqua, Clay and 36 more	90 min

Nearby

Mesoscale Discussions in Nebraska, 2004 Mesoscale Discussions in Kansas, 2004 Mesoscale Discussions in Missouri, 2004 Every 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; radar from the NEXRAD Level II archive.