TONIGHT THROUGH WEDNESDAY NIGHT...
UPPER LOW BECOMING A CLOSED CIRCULATION OVER NW ARIZONA THIS MORNING
AND AS A RESULT THE BAROCLINIC BAND HAS WEAKENED. CLOUD TOPS HAVE
WARMED HOWEVER RADAR SHOWING ONGOING MOUNTAIN SNOW OVER THE SAN
JUANS. THE ARIZONA LOW AND THE NRN STREAM SHORT WAVE REMAINS
CONNECTED IN THE UPPER LEVELS AND THE TROUGH AXIS MOVES ACROSS WRN
COLORADO THIS AFTERNOON. WITH THE AIR MASS NEARLY SATURATED AND
SHALLOW INSTABILITY...SNOW SHOWERS WILL CONTINUE OVER THE HIGH
COUNTRY WHERE WINTER STORM WARNING HIGHLIGHTS CONTINUE UNTIL 6 PM.
BUT THE HEAVIEST PCPN HAS ALREADY OCCURRED... WINDS ALOFT BECOMING
NORTHEAST AND WEAKENING FRONTOGENETICAL AND DYNAMICAL FORCING WITH
INHIBIT ORGANIZED PCPN. DRYING AND CLEARING TREND...ALREADY UNDERWAY
OVER NE UTAH THIS MORNING...OCCURS BEHIND THE EASTBOUND TROUGH AXIS.
CLOSED LOW MOVES ACROSS SRN NEW MEXICO TONIGHT AND THE DEFORMATION
ZONE THAT IS CONNECTED TO THE NRN STREAM WILL DEPART SW COLORADO
THIS EVENING. SHOWERS WILL END BY MIDNIGHT. FARTHER NORTH...SOME
HIGH LEVEL MOISTURE WILL BE INCREASING AHEAD OF THE NEXT UPSTREAM
SHORT WAVE. LONG WAVE PATTERN WANTS TO FORM AN OMEGA BLOCK ALONG THE
WEST COAST...AND TO DO SO THE NEXT SHORT WAVE DROPS INTO COLORADO ON
WEDNESDAY ON ITS WAY TO ARIZONA AND REPLACES THE CURRENT CLOSED LOW.
THIS WAVE HAS A LONG CONTINENTAL TRACK AND ARRIVES FROM THE
NORTHEAST...BUT THERE IS A MOISTURE PLUME. EXPECT SCATTERED SNOW
SHOWERS TO DEVELOP OVER THE HIGH MOUNTAINS WEDNESDAY AFTERNOON AND
PERSIST THROUGH THE NIGHT...BUT SNOW ACCUMULATION WILL BE LIGHT AS
INSTABILITY AND FORCING WILL BE LACKING.