Alert archive / Nebraska / Mesoscale Discussions in 2023

Mesoscale Discussion 2178

September 23, 202316 counties in Nebraska; Todd County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 23, 2023, 2:27 AM CDT for 16 counties in Nebraska; Todd County, South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Sep 23, 2023, 2:27 AM CDT (07:27 UTC)
Expired: Sep 23, 2023, 5:00 AM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 20%

Counties Blaine County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Garfield County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Thomas County, NE, Valley County, NE, Todd County, SD

The radar

The North Platte radar (KLNX), 20 km from the middle of the area, began a volume at 07:31 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 nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 7.5 hours before the alert went out and 112 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: 173 J/kg
Mixed-layer CIN: -99 J/kg
Mixed-layer LCL: 882 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 22, 8:02 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Garden, Kimball and 4 more	118 min
Sep 23, 9:37 AM CDT	Mesoscale Discussion	SPC	Burt, Butler, Colfax, Cuming, Dakota, Dixon and 7 more	113 min
Sep 23, 4:58 PM CDT	Mesoscale Discussion	SPC	Cass, Douglas, Gage, Johnson, Lancaster, Nemaha and 7 more	2 hr
Sep 23, 2:10 PM CDT	Mesoscale Discussion	SPC	Brookings, Clay, Codington, Deuel, Grant, Hamlin and 7 more	3 hr

Nearby

Mesoscale Discussions in Nebraska, 2023 Mesoscale Discussions in South Dakota, 2023 Every mesoscale discussion in 2023

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.