Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 582

April 18, 2005Marshall County, Nemaha County, Washington County, Kansas; 28 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2005, 12:08 PM CDT for Marshall County, Nemaha County, Washington County, Kansas; 28 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 18, 2005, 12:08 PM CDT (17:08 UTC)
Expired: Apr 18, 2005, 2:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 31 counties

Marshall County, KS, Nemaha County, KS, Washington County, KS, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Madison County, NE, Nemaha 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, Stanton County, NE, Thayer County, NE, Washington County, NE, Wayne County, NE, York County, NE

The radar

The Omaha radar (KOAX), 73 km from the middle of the area, began a volume at 17:10 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 161Apr 18, 3:30 PM CDT

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 5.1 hours before the alert went out and 73 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: 1390 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -109 m²/s²
0-3 km storm-relative helicity: -95 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 17, 9:18 PM CDT	Mesoscale Discussion	SPC	Clark, Comanche, Edwards, Finney, Ford, Grant and 17 more	87 min
Apr 18, 2:09 PM CDT	Mesoscale Discussion	SPC	Haskell, Morton, Seward, Stevens	2 hr
Apr 18, 3:10 PM CDT	Severe Thunderstorm Watch	SPC	Clark, Ford, Grant, Gray, Haskell, Meade and 3 more	7 hr
Apr 18, 5:55 PM CDT	Mesoscale Discussion	SPC	Clark, Ford, Grant, Gray, Haskell, Kearny and 4 more	2 hr
Apr 18, 5:56 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Logan, Rawlins, Sherman, Thomas, Wallace	3 hr
Apr 18, 3:30 PM CDT	Severe Thunderstorm Watch	SPC	Burt, Butler, Cass, Cedar, Colfax, Cuming and 24 more	7 hr
Apr 18, 6:26 PM CDT	Mesoscale Discussion	SPC	Burt, Butler, Cass, Cedar, Colfax, Cuming and 26 more	2 hr

Nearby

Mesoscale Discussions in Nebraska, 2005 Mesoscale Discussions in Kansas, 2005 Every 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.