Alert archive / Nebraska / Mesoscale Discussions in 2019

Mesoscale Discussion 649

May 17, 20198 counties in Kansas; 19 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 17, 2019, 1:55 PM CDT for 8 counties in Kansas; 19 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 17, 2019, 1:55 PM CDT (18:55 UTC)
Expired: May 17, 2019, 4:00 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 27 counties

Cheyenne County, KS, Decatur County, KS, Gove County, KS, Logan County, KS, Norton County, KS, Rawlins County, KS, Sheridan County, KS, Thomas County, KS, Arthur County, NE, Blaine County, NE, Chase County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Red Willow County, NE, Thomas County, NE

The radar

The Goodland radar (KGLD), 134 km from the middle of the area, began a volume at 18:57 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.

Tornado Watch 172May 17, 3:00 PM CDT

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 6.9 hours before the alert went out and 84 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: 31 J/kg
Mixed-layer CIN: -721 J/kg
Mixed-layer LCL: 1114 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 328 m²/s²
0-3 km storm-relative helicity: 332 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 2:59 PM CDT	Tornado Watch	SPC	Cheyenne, Decatur, Gove, Graham, Greeley, Logan and 7 more	9 hr
May 17, 5:45 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Decatur, Gove, Graham, Greeley, Logan and 7 more	2 hr
May 16, 7:57 PM CDT	Severe Thunderstorm Watch	SPC	Burt, Cuming, Dodge, Washington	6 hr
May 16, 8:06 PM CDT	Mesoscale Discussion	SPC	Antelope, Arthur, Blaine, Boone, Brown, Buffalo and 28 more	114 min
May 16, 11:12 PM CDT	Mesoscale Discussion	SPC	Burt, Cuming, Dodge, Washington	2 hr
May 17, 1:14 PM CDT	Mesoscale Discussion	SPC	Banner, Cheyenne, Kimball, Scotts Bluff	2 hr
May 17, 1:54 PM CDT	Severe Thunderstorm Watch	SPC	Banner, Cheyenne, Kimball, Morrill, Scotts Bluff	6 hr
May 17, 4:38 PM CDT	Severe Thunderstorm Watch	SPC	Boyd, Brown, Cherry, Keya Paha, Sheridan	7 hr
May 17, 5:07 PM CDT	Mesoscale Discussion	SPC	Banner, Cheyenne, Kimball, Morrill, Scotts Bluff	113 min

Nearby

Mesoscale Discussions in Nebraska, 2019 Mesoscale Discussions in Kansas, 2019 Every mesoscale discussion in 2019

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.