Alert archive / Nebraska / Mesoscale Discussions in 2024
Mesoscale Discussion 921
The Storm Prediction Center issued this mesoscale discussion at May 23, 2024, 10:38 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 23, 2024, 10:38 PM CDT (03:38 UTC)
- Expired
- May 24, 2024, 12:45 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 294...297
All 78 counties
Audubon County, IA, Cherokee County, IA, Crawford County, IA, Fremont County, IA, Harrison County, IA, Ida County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Plymouth County, IA, Pottawattamie County, IA, Shelby County, IA, Woodbury County, IA, Jewell County, KS, Norton County, KS, Phillips County, KS, Republic County, KS, Smith County, KS, Washington County, KS, Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gage County, NE, Garfield 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, Knox County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Otoe County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Red Willow County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Webster County, NE, Wheeler County, NE, York County, NE, Union County, SD
The radar
The Grand Island radar (KUEX), 103 km from the middle of the area, began a volume at 03:40 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 3.6 hours before the alert went out and 120 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2328 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 226 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
726
ACUS11 KWNS 240339
SWOMCD
SPC MCD 240338
IAZ000-MOZ000-NEZ000-KSZ000-SDZ000-240545-
Mesoscale Discussion 0921
NWS Storm Prediction Center Norman OK
1038 PM CDT Thu May 23 2024
Areas affected...Central and Eastern Nebraska...Far Northern
Kansas...Western Iowa
Concerning...Severe Thunderstorm Watch 294...297...
Valid 240338Z - 240545Z
The severe weather threat for Severe Thunderstorm Watch 294, 297
continues.
SUMMARY...The wind-damage threat will likely increase as a linear
MCS organizes across central and eastern Nebraska over the next
couple of hours. The severe threat should eventually affect parts of
western Iowa, where additional watch issuance may be needed during
the overnight period.
DISCUSSION...Mosaic radar imagery currently shows a developing line
of strong to severe thunderstorms from far northwest Kansas into
central and northeast Nebraska. This line is forecast to begin to
accelerate eastward across central and eastern Nebraska over the
next couple of hours, as a strengthening low-level jet increases
moisture and instability across the central Plains. As the storms
move eastward along a west-northwest to east-southeast gradient of
moderate to strong instability, the MCS is expected to become
increasingly organized. A wind-damage threat will be possible with
the stronger parts of the line, and this threat should become more
widespread as a large-scale bowing line segment organizes. The
wind-damage threat will affect much of eastern Nebraska late this
evening, and may affect western Iowa well after midnight.
..Broyles.. 05/24/2024
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DMX...EAX...FSD...OAX...TOP...GID...LBF...GLD...
LAT...LON 39589971 39569779 39859683 40279600 41089500 41769487
42269499 42739550 42889648 42809785 42359895 41859949
40990026 40190064 39720029 39589971SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 8:43 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Harrison, Ida, Monona and 6 more | 7 hr |
| May 24, 1:15 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 30 more | 2 hr |
| May 24, 1:33 AM CDT | Severe Thunderstorm Watch | SPC | Fremont, Mills, Montgomery, Page | 4 hr |
| May 24, 2:44 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 60 more | 7 hr |
| May 24, 3:54 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Boone, Buena Vista and 40 more | 2 hr |
| May 24, 5:17 AM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Black Hawk, Boone, Bremer, Buchanan and 38 more | 118 min |
| May 24, 6:07 AM CDT | Severe Thunderstorm Watch | SPC | Chickasaw, Clayton, Clinton, Fayette, Floyd, Jackson and 1 more | 9 hr |
| May 24, 2:39 PM CDT | Severe Thunderstorm Watch | SPC | Des Moines, Henry, Jefferson, Lee, Van Buren | 10 hr |
| May 24, 4:29 PM CDT | Severe Thunderstorm Watch | SPC | Cherokee | 9 hr |
| May 23, 8:20 PM CDT | Mesoscale Discussion | SPC | Adams, Antelope, Boone, Buffalo, Butler, Clay and 42 more | 115 min |
Nearby
Mesoscale Discussions in Nebraska, 2024Mesoscale Discussions in Iowa, 2024Mesoscale Discussions in Kansas, 2024Every mesoscale discussion in 2024
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.