Heavy Snow Discussion and SELS Mesoscale Update

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1 total messages Started by Chris Novy - WA9V Tue, 06 Feb 1990 18:54

Author: Chris Novy - WA9V
Date: Tue, 06 Feb 1990 18:54

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ZCZC NFDQPFHSD
FOUS11 KWBC 061842
NMC Heavy Snow Discussion...reference AFOS graphic 93S
Valid February 070000 to 071200

Little change from previous discussion and forecast.

Latest satellite imagery continues to show enhanced cumulus under upper
trough moving towards the northwest U.S.  The very cold air aloft will
continue to tap the moist low level onshore flow resulting in locally
heavy snows accumulating over favored orographic terrain of the Pacific
Northwest and the northern Rockies.

Korty
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ZCZC MKCSWOMCD
ACUS3 KMKC 061839
MKC MCD 061839

SELS Mesoscale Discussion for Washington/Oregon...

Concerning... Heavy Snow

During the past couple of hours satellite imagery has shown persistent
cold cloud tops over northwestern Washington.  These clouds are
associated with on shore convective activity. Surface temperatures have
been around freezing and occasional moderate snow is being reported at
Quillayute, WA.

Snowfall rates of around 2 inches per hour are possible from this
continued on shore flow of convective activity with snow.  Prime area
affected is the Olympic Mountains and area just north of Hoquiam, WA
from northern Grays Harbor through much of Clallam and Jefferson counties.

Heavy precipitation..rain/snow..extends southward across western
Washington and Astoria, or area to about 25 north Newport, OR.  This
includes Clatsop and Tillamook counties.

..Beckman.. 02/06/90
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Chris Novy - WA9V               BITNET: axvsccn@uicvmc
Southern Illinois Univ.       Internet: axvsccn@uicvmc.aiss.uiuc.edu
Morris Library - Systems        Packet: wa9v@wd9ebq    FAX: (618) 453-8109
Carbondale, IL  62901-6632       Phone: (618) 453-1683  or  (618) 457-6149
                                  ICBM: 37.43N  89.12W
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