Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 35

January 19, 201114 counties in Kansas; 32 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jan 19, 2011, 10:52 AM CST for 14 counties in Kansas; 32 counties in Nebraska. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jan 19, 2011, 10:52 AM CST (16:52 UTC)
Expired: Jan 19, 2011, 2:45 PM CST
In force: 4 hr
Issued by: the Storm Prediction Center

All 46 counties

Clay County, KS, Cloud County, KS, Geary County, KS, Jackson County, KS, Jewell County, KS, Marshall County, KS, Mitchell County, KS, Nemaha County, KS, Ottawa County, KS, Pottawatomie County, KS, Republic County, KS, Riley County, KS, Smith County, KS, Washington County, KS, Adams County, NE, Buffalo County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Fillmore County, NE, Franklin County, NE, Gage 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, Lancaster County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Polk County, NE, Saline County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 36 km from the middle of the area, began a volume at 16:56 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, 4.9 hours before the alert went out and 172 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 866 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

296 
ACUS11 KWNS 191652
SWOMCD
SPC MCD 191652 
NEZ000-KSZ000-192045-

MESOSCALE DISCUSSION 0035
NWS STORM PREDICTION CENTER NORMAN OK
1052 AM CST WED JAN 19 2011

AREAS AFFECTED...S-CNTRL/SERN NEB AND N-CNTRL/NERN KS

CONCERNING...HEAVY SNOW 

VALID 191652Z - 192045Z

SNOWFALL RATES WILL REACH 1 INCH PER HOUR...WITH LOCALLY HIGHER
AMOUNTS...IN SNOW BANDS ACROSS S-CNTRL/SERN NEB AND N-CNTRL/NERN KS
THIS AFTERNOON.

A SHIELD OF MDT SNOW...WITH EMBEDDED BANDS OF HVY SNOW...IS SHIFTING
EWD/NEWD ACROSS CNTRL NEB AND NERN KS. THIS ACTIVITY IS BEING
SUPPORTED BY LOW/MID-LEVEL ISENTROPIC UPGLIDE ATOP THE COLD AIRMASS
ENTRENCHED ACROSS THE NRN PLAINS AND UPPER MIDWEST. SNOWFALL RATES
COULD INTENSIFY THROUGH THE AFTERNOON AS THE SNOW MOVES ACROSS THE
DISCUSSION AREA IN RESPONSE TO LOW/MID-LEVEL FRONTOGENESIS AHEAD OF
A SHORTWAVE TROUGH APPROACHING THE REGION. THIS WILL BE FURTHER
SUPPORTED BY CONVERGENCE AT THE NOSE OF A 35-40-KT 850-MB JET
LEADING THE LOW-LEVEL TROUGH. FORECAST SOUNDINGS INDICATE THAT THE
ASCENT WILL COINCIDE WITH A DEEP DENDRITIC LAYER...PROMOTING
EFFICIENT SNOW GROWTH. FURTHERMORE...SNOW-TO-LIQUID RATIOS WILL BE
ENHANCED BY THE ANTECEDENT COLD AIRMASS...WITH SNOWFALL RATES IN
HEAVIER BANDS EXPECTED TO REACH 1 INCH PER HOUR THROUGH THE
AFTERNOON. LOCALLY HIGHER RATES WILL ALSO BE POSSIBLE.

..COHEN/GARNER.. 01/19/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...OAX...TOP...ICT...GID...LBF...

LAT...LON   41729811 40599600 39389572 38889702 39149832 40600001
            41280034 41809980 41729811

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 19, 2:12 PM CST	Mesoscale Discussion	SPC	Atchison, Doniphan, Douglas, Jackson, Jefferson, Johnson and 4 more	5 hr
Jan 19, 6:37 AM CST	Mesoscale Discussion	SPC	Blaine, Custer, Garfield, Greeley, Howard, Logan and 4 more	5 hr

Nearby

Mesoscale Discussions in Nebraska, 2011 Mesoscale Discussions in Kansas, 2011 Every mesoscale discussion in 2011

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.