SPC MD 1767


MD 1767 Image

Mesoscale Discussion 1767
NWS Storm Prediction Center Norman OK
1153 AM CDT Wed Oct 28 2020

Areas affected...Northeast New Mexico


Valid 281653Z - 282000Z

SUMMARY...Periodic and localized whiteout conditions continue to be
possible this afternoon as winds increase across northeast New

DISCUSSION...Light to moderate snowfall continues across northeast
NM into the west/northwestern TX Panhandle. This snow is largely
being driven by broad synoptic ascent associated with the left-exit
region of an upper-level jet over the Southern Plains. Additionally,
isentropic ascent within the TROWAL coincident with a confluence
axis at around 700 mb from southwest KS into northeast NM is
providing more localized ascent over the region. Areas of weak
instability rooted in the 700-600 mb layer (per recent RAP forecast
soundings) are also allowing for transient and localized pockets of
more moderate to heavy snowfall. 

While these factors are yielding mostly moderate (to at times heavy)
snowfall rates, surface winds have increased within the past hour to
around 25 mph with frequent gusts near 35 mph for some locations.
This is slightly sooner than expected by most guidance, and has
resulted in reports of whiteout conditions for parts of northeast NM
this morning. Winds are forecast to increase slightly into the
afternoon, and when coincident with falling snow, should continue to
lead to periods of whiteout conditions. There is some uncertainty
regarding how long these conditions will last heading into the
mid/late afternoon as snowfall gradually diminishes and temperatures
climb closer to freezing, which may limit the potential for blowing

..Moore.. 10/28/2020

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


LAT...LON   35650508 36190485 36890427 36980377 36970303 36430301
            35320299 35050308 35020347 34970388 35010431 35060464
            35280505 35650508 

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