Alert archive / Nebraska / Mesoscale Discussions in 2021
Mesoscale Discussion 758
The Storm Prediction Center issued this mesoscale discussion at May 26, 2021, 9:04 PM CDT for 14 counties in Kansas; 19 counties in Nebraska. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- May 26, 2021, 9:04 PM CDT (02:04 UTC)
- Expired
- May 26, 2021, 11:00 PM CDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 212
All 33 counties
Clay County, KS, Cloud County, KS, Decatur County, KS, Jewell County, KS, Lincoln County, KS, Mitchell County, KS, Norton County, KS, Osborne County, KS, Ottawa County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Smith County, KS, Washington County, KS, Adams County, NE, Buffalo County, NE, Clay County, NE, Dawson County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Jefferson County, NE, Kearney County, NE, Lincoln County, NE, Nuckolls County, NE, Phelps County, NE, Red Willow County, NE, Thayer County, NE, Webster County, NE
The radar
The Grand Island radar (KUEX), 85 km from the middle of the area, began a volume at 02:05 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, 2.1 hours before the alert went out and 148 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
- 124 J/kg
- Mixed-layer CIN
- -115 J/kg
- Mixed-layer LCL
- 1622 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 149 m²/s²
- 0-3 km storm-relative helicity
- 363 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 9.7
The text
As transmitted.
563
ACUS11 KWNS 270205
SWOMCD
SPC MCD 270204
KSZ000-NEZ000-270400-
Mesoscale Discussion 0758
NWS Storm Prediction Center Norman OK
0904 PM CDT Wed May 26 2021
Areas affected...Parts of southern Nebraska and northern Kansas
Concerning...Severe Thunderstorm Watch 212...
Valid 270204Z - 270400Z
The severe weather threat for Severe Thunderstorm Watch 212
continues.
SUMMARY...Thunderstorm activity may gradually consolidate and
organize while developing eastward across the region through 10
PM-Midnight CDT. Eventually, this may be accompanied by increasing
risk for strong surface gusts, in addition to a continuing risk for
large hail.
DISCUSSION...As a southerly low-level jet strengthens this evening,
thunderstorm development continues to increase within stronger
lower/mid tropospheric warm advection. This is generally focused
along the northeastern periphery of the plume of warmer elevated
mixed-layer air emanating from the southern Rockies (which appears
roughly delineated by 8-10 C around 700 mb), as mid-level troughing
continues to slowly progress east of the northern Rockies.
A gradual consolidation of convection appears possible through
03-05Z, roughly centered near the Kansas/Nebraska border area, where
inflow of moist air characterized by moderate to large CAPE
(1500-3000 J/kg) probably will maintain vigorous intensities.
Although this may be mostly rooted above a drier/more stable
boundary layer, in the presence of strong shear within the
convective layer, potential exists for convection to gradually
organize, and eventually pose increasing risk for strong surface
gusts.
..Kerr.. 05/27/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...OAX...TOP...ICT...GID...LBF...GLD...
LAT...LON 41110125 41099954 40189653 39329691 38979773 39229933
39670043 40640174 41110125SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 7:32 PM CDT | Mesoscale Discussion | SPC | Clark, Comanche, Kiowa | 88 min |
| May 26, 11:26 PM CDT | Mesoscale Discussion | SPC | Butler, Chautauqua, Cowley, Elk, Harper, Montgomery and 2 more | 64 min |
| May 27, 12:51 AM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Atchison, Bourbon, Butler, Chase and 39 more | 84 min |
| May 27, 1:05 AM CDT | Severe Thunderstorm Watch | SPC | Allen, Anderson, Atchison, Bourbon, Brown, Chase and 32 more | 7 hr |
| May 27, 2:17 AM CDT | Mesoscale Discussion | SPC | Atchison, Clay, Cloud, Geary, Jackson, Marshall and 7 more | 58 min |
| May 27, 5:28 AM CDT | Mesoscale Discussion | SPC | Anderson, Douglas, Franklin, Jefferson, Johnson, Leavenworth and 7 more | 92 min |
| May 27, 11:04 AM CDT | Mesoscale Discussion | SPC | Cherokee, Crawford, Labette, Montgomery | 86 min |
| May 27, 1:36 PM CDT | Mesoscale Discussion | SPC | Anderson, Atchison, Butler, Chase, Coffey, Douglas and 18 more | 54 min |
| May 27, 6:03 PM CDT | Mesoscale Discussion | SPC | Douglas, Franklin, Johnson, Leavenworth, Miami, Wyandotte | 87 min |
Nearby
Mesoscale Discussions in Nebraska, 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.