Alert archive / Kansas / Mesoscale Discussions in 2019

Mesoscale Discussion 1997

September 21, 201910 counties in Kansas; 7 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Sep 21, 2019, 3:29 PM CDT for 10 counties in Kansas; 7 counties in Nebraska. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 21, 2019, 3:29 PM CDT (20:29 UTC)
Expired: Sep 21, 2019, 5:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Ellis County, KS, Finney County, KS, Jewell County, KS, Lane County, KS, Ness County, KS, Osborne County, KS, Republic County, KS, Rooks County, KS, Smith County, KS, Trego County, KS, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Nuckolls County, NE, Pawnee County, NE, Saline County, NE, Thayer County, NE

The radar

The Grand Island radar (KUEX), 151 km from the middle of the area, began a volume at 20:33 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 657Sep 21, 5:10 PM CDT

The nearest sounding before it

Dodge City, (KDDC), launched 12:00Z, 8.5 hours before the alert went out and 159 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: 892 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 866 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 321 m²/s²
0-3 km storm-relative helicity: 319 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
Sep 21, 5:07 PM CDT	Severe Thunderstorm Watch	SPC	Barton, Clay, Cloud, Dickinson, Edwards, Ellis and 33 more	7 hr
Sep 20, 7:53 PM CDT	Mesoscale Discussion	SPC	Box Butte, Cherry, Dawes, Morrill, Scotts Bluff, Sheridan and 1 more	2 hr
Sep 20, 10:20 PM CDT	Mesoscale Discussion	SPC	Cherry, Dawes, Sheridan	115 min
Sep 21, 1:33 PM CDT	Mesoscale Discussion	SPC	Dakota	87 min

Nearby

Mesoscale Discussions in Kansas, 2019 Mesoscale Discussions in Nebraska, 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.