Alert archive / Nebraska / Mesoscale Discussions in 2007

Mesoscale Discussion 562

April 24, 200740 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2007, 1:35 PM CDT for 40 counties in Nebraska. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Apr 24, 2007, 1:35 PM CDT (18:35 UTC)
Expired: Apr 24, 2007, 2:30 PM CDT
In force: 55 min
Issued by: the Storm Prediction Center

All 40 counties

Adams County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gage County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Lincoln County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Polk County, NE, Red Willow County, NE, Richardson County, NE, Saline County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 43 km from the middle of the area, began a volume at 18:38 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 175Apr 24, 1:50 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 6.6 hours before the alert went out and 173 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: 665 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 235 m²/s²
0-3 km storm-relative helicity: 538 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
Apr 23, 9:53 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Buffalo, Chase, Clay, Dawson, Deuel and 17 more	8 hr
Apr 23, 10:41 PM CDT	Tornado Watch	SPC	Dundy, Hitchcock, Red Willow	5 hr
Apr 24, 1:37 AM CDT	Mesoscale Discussion	SPC	Chase, Dundy, Frontier, Furnas, Hayes, Hitchcock and 1 more	83 min
Apr 24, 5:03 AM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Clay, Dawson, Franklin, Furnas and 8 more	87 min
Apr 24, 1:48 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Buffalo, Clay, Dawson, Fillmore, Franklin and 21 more	5 hr
Apr 24, 2:48 PM CDT	Mesoscale Discussion	SPC	Chase, Dundy, Hitchcock	117 min

Nearby

Mesoscale Discussions in Nebraska, 2007 Every mesoscale discussion in 2007

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.