Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 719

April 24, 200820 counties in Kansas; 21 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2008, 11:55 PM CDT for 20 counties in Kansas; 21 counties in Nebraska. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Apr 24, 2008, 11:55 PM CDT (04:55 UTC)
Expired: Apr 25, 2008, 1:00 AM CDT
In force: 65 min
Issued by: the Storm Prediction Center

All 41 counties

Brown County, KS, Clay County, KS, Cloud County, KS, Dickinson County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Osborne County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Shawnee County, KS, Smith County, KS, Wabaunsee County, KS, Washington County, KS, Adams County, NE, Cass County, NE, Clay County, NE, Fillmore County, NE, Franklin County, NE, Gage County, NE, Hamilton County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Seward County, NE, Thayer County, NE, Webster County, NE, York County, NE

The radar

The Topeka radar (KTWX), 97 km from the middle of the area, began a volume at 04:58 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

Topeka, KS (KTOP), launched 00:00Z, 4.9 hours before the alert went out and 130 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: 956 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 777 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 219 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.3

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
Apr 24, 8:55 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Gove, Graham, Logan, Norton and 6 more	95 min
Apr 24, 10:20 PM CDT	Severe Thunderstorm Watch	SPC	Brown, Clay, Cloud, Dickinson, Geary, Jackson and 14 more	7 hr
Apr 25, 12:07 AM CDT	Severe Thunderstorm Watch	SPC	Doniphan	7 hr
Apr 25, 12:55 AM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Clay, Cloud, Doniphan, Jackson and 8 more	35 min
Apr 25, 1:13 AM CDT	Tornado Watch	SPC	Atchison, Brown, Clay, Cloud, Doniphan, Jackson and 6 more	5 hr
Apr 25, 3:18 AM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Clay, Cloud, Doniphan, Jackson and 6 more	57 min
Apr 25, 5:39 AM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Jackson	36 min
Apr 25, 6:38 AM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 17 more	67 min
Apr 25, 6:06 AM CDT	Mesoscale Discussion	SPC	Antelope, Blaine, Boyd, Brown, Garfield, Holt and 5 more	6 hr

Nearby

Mesoscale Discussions in Nebraska, 2008 Mesoscale Discussions in Kansas, 2008 Every mesoscale discussion in 2008

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.