Alert archive / Nebraska / Mesoscale Discussions in 2016
Mesoscale Discussion 449
The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2016, 1:35 AM MDT for Phillips County, Sedgwick County, Yuma County, Colorado; 5 counties in Nebraska. It was in force for 115 min.
The area
The outline as issued.
The facts
- Issued
- Apr 26, 2016, 1:35 AM MDT (07:35 UTC)
- Expired
- Apr 26, 2016, 3:30 AM MDT
- In force
- 115 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 5%
Counties Phillips County, CO, Sedgwick County, CO, Yuma County, CO, Chase County, NE, Deuel County, NE, Dundy County, NE, Keith County, NE, Perkins County, NE
The radar
The Goodland radar (KGLD), 161 km from the middle of the area, began a volume at 07:38 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, 7.6 hours before the alert went out and 134 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
- 2237 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
879
ACUS11 KWNS 260735
SWOMCD
SPC MCD 260735
NEZ000-KSZ000-COZ000-260930-
MESOSCALE DISCUSSION 0449
NWS STORM PREDICTION CENTER NORMAN OK
0235 AM CDT TUE APR 26 2016
AREAS AFFECTED...FAR NORTHEAST CO...SOUTHWEST NEB
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 260735Z - 260930Z
PROBABILITY OF WATCH ISSUANCE...5 PERCENT
SUMMARY...ELEVATED CONVECTIVE CLUSTERS OVER FAR NORTHEAST CO MAY
POSE A THREAT FOR ISOLATED SEVERE HAIL AS THEY SHIFT INTO SOUTHWEST
NEB. CONFINED SPATIOTEMPORAL EXTENT/MARGINAL NATURE OF THE RISK
SHOULD PRECLUDE A WW ISSUANCE.
DISCUSSION...A PAIR OF ELEVATED CONVECTIVE CLUSTERS FROM SEDGWICK TO
YUMA COUNTY CO HAVE INTENSIFIED SINCE 0700Z. THIS ACTIVITY APPEARS
TO BE ASSOCIATED WITH A LOBE OF FORCED ASCENT IMMEDIATELY AHEAD OF A
LEAD SHORTWAVE IMPULSE SHIFTING NORTH OVER THE LEE OF THE CO
ROCKIES. WITH THE SURFACE WARM FRONT DRAPED ACROSS WEST-CENTRAL
KS...CONVECTION IS LIKELY ELEVATED AMID UPPER 30S TO MIDDLE 40S
SURFACE DEW POINTS...WHICH IS WELL SUPPORTED BY RAP SOUNDINGS.
HOWEVER...MOISTURE ADVECTION ABOVE THE SURFACE IS CONTRIBUTING TO A
CONFINED PLUME OF WEAK TO MODERATE BUOYANCY AMID STEEP MID-LEVEL
LAPSE RATES. WHILE PREDOMINANT MERIDIONAL FLOW THROUGH THE
CLOUD-BEARING LAYER WILL FOSTER A CONTINUED CLUSTER MODE...ISOLATED
SEVERE HAIL IS POSSIBLE AS THIS ACTIVITY LIKELY SPREADS
NORTH-NORTHEAST INTO PARTS OF SOUTHWEST NEB.
..GRAMS/EDWARDS.. 04/26/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LBF...GLD...BOU...CYS...
LAT...LON 40950268 41180264 41520237 41560197 41280152 40790139
40350141 40030182 39890229 40070257 40950268SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 1:18 AM MDT | Mesoscale Discussion | SPC | Gage, Jefferson, Pawnee, Richardson, Thayer | 117 min |
| Apr 26, 2:02 AM MDT | Severe Thunderstorm Watch | SPC | Adams, Clay, Fillmore, Gage, Jefferson, Johnson and 7 more | 6 hr |
| Apr 26, 3:37 AM MDT | Mesoscale Discussion | SPC | Gage, Jefferson, Pawnee, Richardson, Thayer | 83 min |
| Apr 26, 12:35 PM MDT | Mesoscale Discussion | SPC | Gage, Jefferson, Johnson, Pawnee, Thayer | 115 min |
| Apr 26, 1:12 PM MDT | Tornado Watch | SPC | Adams, Buffalo, Clay, Fillmore, Franklin, Gage and 20 more | 7 hr |
| Apr 26, 5:14 PM MDT | Mesoscale Discussion | SPC | Butler, Cass, Dodge, Douglas, Lancaster, Nemaha and 4 more | 61 min |
| Apr 26, 5:32 PM MDT | Mesoscale Discussion | SPC | Adams, Clay, Fillmore, Franklin, Gage, Jefferson and 7 more | 58 min |
Nearby
Mesoscale Discussions in Nebraska, 2016Mesoscale Discussions in Colorado, 2016Every mesoscale discussion in 2016
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.