Quantitative Precipitation Forecast
Issued by NWS

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000
FOUS11 KWBC 192103
QPFHSD

PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
402 PM EST THU JAN 19 2017

VALID 00Z FRI JAN 20 2017 - 00Z MON JAN 23 2017


MUCH OF THE WEST...

WIDESPREAD HEAVY MTN SNOW IS ANTICIPATED FRIDAY THROUGH THIS
WEEKEND ON A TRAJECTORY FROM CA TO THE FOUR CORNERS REGION. A WAVE
OF VERY DYNAMIC PAC STORM SYSTEMS WITH ANOMALOUS MOISTURE CONTENT
AND POTENT UPPER JET STREAKS WILL FOLLOW ONE ANOTHER ALONG NWRLY
ZONAL FLOW.

AN INITIAL SYSTEM ALREADY HAS PROCEEDED THROUGH SOUTHERN CA AND IS
LOCATED OVER THE DESERT SOUTHWEST THIS AFTN. THIS FEATURE WILL
STREAM THROUGH THE FOUR CORNERS REGION AND EJECT OUT INTO THE
CENTRAL/SRN PLAINS OVER THE NEXT DAY. MEANWHILE UPSTREAM... A MORE
POWERFUL SYSTEM WILL TAKE AIM FOR NRN/CENTRAL CA AND SPREAD DOWN
THE COAST TO SRN CA BY FRI EVENING. THE HEAVIEST ACCUMULATIONS
OVER THIS DAY WILL BE FROM THE NRN CA MTNS SISKIYOU/SHASTA AND
DOWN THE ENTIRE SPINE OF SIERRA WITH A FOOT TO 18 INCHES FOR THE
FORMER AND POSSIBLE FEET OR GREATER FOR THE SIERRA. SNOWFALL
ACCUMULATIONS ARE EVEN POSSIBLE ACROSS THE SRN CA MTNS OF SAN
BERNARDINO/SAN GABRIEL. ALSO... EXPECT HEAVY ACCUMULATIONS WITH
THE FORMER SYSTEM FROM SRN NV TERRAIN THROUGH THE SRN
WASATCH/MOGOLLON RIM TO SAN JUANS OF SW CO.

THE SECONDARY SYSTEM AND JET DYNAMICS FROM FRI WILL STREAM THROUGH
THE DESERT SW AND NRN MEXICO ON SAT TO PRODUCE WIDESPREAD HEAVY
SNOWFALL ACROSS THE FOUR CORNERS STATES. OROGRAPHIC AMOUNTS OF A
FOOT WILL BE POSSIBLE FROM THE SRN WASATCH/MOGOLLON RIM AND SAN
JUANS. MEANWHILE UPSTREAM... RATHER PERSISTENT AND CONSTANT
ONSHORE FLOW WILL CONTINUE TO INUNDATE CA WITH THE FAVORED TERRAIN
SEEING MORE HEAVY SNOWFALL.

FINALLY FOR SUN... A RATHER WRAPPED UP PAC SYSTEM WILL DIRECT
ENHANCED PAC MOISTURE TRANSPORT INTO CA AGAIN. THE HEAVIEST
OROGRAPHIC SNOW WILL OCCUR ACROSS CA BUT BEGIN TO SPREAD INTO THE
INTER-MOUNTAIN WEST. THE NRN CA MTNS AND SIERRA WILL LIKELY SEE AN
ADDITIONAL FOOT TO TWO FEET BASED ON THE VERY NARROW MODEL SPREAD.



MUSHER

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