Alert archive / Nebraska / Mesoscale Discussions in 2021
Mesoscale Discussion 30
The Storm Prediction Center issued this mesoscale discussion at Jan 25, 2021, 10:41 AM CST for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jan 25, 2021, 10:41 AM CST (16:41 UTC)
- Expired
- Jan 25, 2021, 4:45 PM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Heavy snow
All 98 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Mills County, IA, Monona County, IA, Monroe County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Story County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Brown County, KS, Clay County, KS, Cloud County, KS, Doniphan County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Osborne County, KS, Ottawa County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Smith County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO, Adams County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Gage County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps 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, Webster County, NE, York County, NE
The radar
The Omaha radar (KOAX), 85 km from the middle of the area, began a volume at 16:40 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 nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 4.7 hours before the alert went out and 85 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
- 468 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 149 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
849
ACUS11 KWNS 251642
SWOMCD
SPC MCD 251641
IAZ000-MOZ000-KSZ000-NEZ000-252245-
Mesoscale Discussion 0030
NWS Storm Prediction Center Norman OK
1041 AM CST Mon Jan 25 2021
Areas affected...North-Central/Northeast KS...Southeast/East-Central
NE...Southwest/South-Central IA...Far Northwest MO
Concerning...Heavy snow
Valid 251641Z - 252245Z
SUMMARY...Ongoing heavy snow across southeastern NE and
north-central/far northeast KS is expected to continue for next
several hours. Additionally, gradual eastward expansion of this
heavy snow into southwest IA and far northwest MO is anticipated.
DISCUSSION...Recent surface observations show numerous locations
across southeast NE and adjacent north-central KS reporting moderate
to heavy snow. Satellite and radar imagery show the dry slot is
currently moving through central KS, suggesting much of southeast NE
will remain within the band of heavy snow for at least the next
several hours. Additionally, with the shortwave trough approaching
the region, lift will likely intensify, resulting in increased
snowfall rates and the potential for up to 2" per hour (particularly
across far southeast NE).
As the overall system moves northeastward, the area of heavy snow is
expected to do likewise, bringing snowfall rates over 1" per hour in
southwest/south-central IA and far northwest MO during the next
several hours. Once established, these high snowfall rates are
expected to last for 3+ hours.
..Mosier.. 01/25/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DMX...EAX...OAX...TOP...ICT...GID...DDC...GLD...
LAT...LON 40759933 41589813 42089667 42219426 41979312 41359273
40409310 39999373 39669519 39359650 39129769 39119913
39450003 40759933SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 25, 3:26 PM CST | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 55 more | 4 hr |
| Jan 24, 11:42 PM CST | Mesoscale Discussion | SPC | Barton, Clark, Edwards, Ellsworth, Ford, Hodgeman and 5 more | 5 hr |
| Jan 25, 4:58 AM CST | Mesoscale Discussion | SPC | Barton, Clay, Cloud, Ellis, Ellsworth, Finney and 28 more | 6 hr |
Nearby
Mesoscale Discussions in Nebraska, 2021Mesoscale Discussions in Iowa, 2021Mesoscale Discussions in Kansas, 2021Every mesoscale discussion in 2021
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.