Mesoscale Discussion 1908

Issued

Dec 25, 2016, 6:13 PM EST (23:13 UTC)

Expired

Dec 26, 2016, 12:15 AM EST

In force

6 hr

Issued by

the Storm Prediction Center

The Duluth radar (KDLH), 83 km from the middle of the area, began a volume at 23:14 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.

429 
ACUS11 KWNS 252313
SWOMCD
SPC MCD 252313 
MIZ000-WIZ000-MNZ000-NDZ000-260515-

Mesoscale Discussion 1908
NWS Storm Prediction Center Norman OK
0513 PM CST Sun Dec 25 2016

Areas affected...portions of far eastern ND...northern MN/WI and
western portions of the Upper Peninsula of MI

Concerning...Winter mixed precipitation 

Valid 252313Z - 260515Z

SUMMARY...Snow, sleet and freezing rain, heavy at times, will
continue for the next several hours.

DISCUSSION...A band of light to moderate precipitation is spreading
northward across the upper Midwest late this afternoon in warm
advection regime ahead of the deepening surface low over southwest
NE and upper shortwave impulse now ejecting northeastward into the
central and northern Plains. On the southern fringes of this
precipitation from east-central ND into central MN, surface
temperatures were hovering near freezing and areas of mixed winter
precip types were noted. In fact, some sites were reporting freezing
rain rates greater than 0.05 in/hr. Further north, accumulation of
freezing rain mixed with sleet and snow may be greater due to
surface temperatures in the mid 20s to near 30 degrees. Surface
temperatures may warm a bit into this nighttime hours but are
expected to remain below freezing several more hours. The midlevel
warm layer between 850-700mb ranges from around 5 deg C to 1 deg C
from south to north. As a result, freezing rain and sleet are
expected, possibly mixed with snow at times as midlevel temperatures
begin to cool in the 04-06z time frame. Freezing rain rates may be
heavy at times, from 0.02 to 0.05 in/hr for the next 4-6 hours.

..Leitman.. 12/25/2016

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...MQT...GRB...DLH...ARX...MPX...FGF...

LAT...LON   45768761 45078802 44818866 44698927 45049064 45589250
            45969414 46199516 46739748 47019832 47419842 47849829
            48289779 48779712 48929596 48589332 46798814 45768761

Mesoscale Discussions in Minnesota, 2016Mesoscale Discussions in Wisconsin, 2016Mesoscale Discussions in North Dakota, 2016Every mesoscale discussion in 2016

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.