971 
FXUS65 KSLC 242130
AFDSLC
UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH
230 PM MST FRI MAR 24 2000

SYNOPSIS...HIGH PRESSURE WILL DOMINATE THE WEATHER OVER THE AREA FOR 
SATURDAY AND SUNDAY. EXCEPT...LATE SATURDAY NIGHT AND SUNDAY MORNING 
A STORM SYSTEM WILL MOVE TO THE NORTH OF THE AREA...AND INCREASE THE 
MOISTURE OVER NORTHERN UTAH...SOUTHERN IDAHO AND SOUTHWEST WYOMING. 
CHANCES OF PRECIPITATION OVER THE NORTH WILL INCREASE...BUT WILL BE 
MINIMAL.  

DISCUSSION...A HIGH PRESSURE RIDGE WILL DOMINATE THE WEATHER FOR THE 
NEXT 48 HOURS.  WARM ADVECTION ALOFT WILL INCREASE SURFACE 
TEMPERATURES ON SATURDAY AND MAINTAIN THEM FOR THE MOST PART ON 
SUNDAY.  AN UPPER LEVEL SHORT WAVE IS EXPECTED TO MOVE ACROSS IDAHO 
LATE SATURDAY NIGHT AND SUNDAY.  THE ETA IS STRONGER WITH THIS 
FEATURE THAN THE AVN AND INDICATES MORE OF AN IMPACT ON THE NORTHERN 
PORTION OF THE AREA.  I BELIEVE THAT THERE WILL BE SOME IMPACT ON 
THE NORTH BUT NOT AS MUCH AS SUGGESTED BY THE ETA. SO I HAVE 
INTRODUCED SMALL CHANCES OF PRECIPITATION OVER THE NORTH LATE 
SATURDAY NIGHT AND SUNDAY...ALSO A LITTLE COOLING.  THE SOUTH WILL 
REMAIN UNDER THE INFLUENCE OF THE HIGH ALTHOUGH HIGH LEVEL CLOUDS 
WILL BE STREAMING ACROSS THE AREA FROM THE SYSTEM OFF THE CALIFORNIA 
COAST. 

IN THE EXTENDED PERIOD...THE LOW OFF THE CALIFORNIA COAST IS 
EXPECTED TO MOVE ACROSS SOUTHERN ARIZONA ON MONDAY AND CONTINUE TO 
MOVE EAST TUESDAY...WITH LITTLE IMPACT ON OUR AREA.  HOWEVER...IT 
SHOULD DECREASE HEIGHTS AND PROVIDE MOISTURE FOR MID AND HIGH LEVEL 
CLOUDS ESPECIALLY OVER THE SOUTH ON MONDAY. LATE MONDAY NIGHT AND 
TUESDAY A FAIRLY SIGNIFICANT TROUGH IS EXPECTED TO MOVE INTO THE 
AREA FOR THE NORTHWEST WITH A SURFACE COLDFRONT.  MOISTURE AND 
CHANCES OF RAIN WILL INCREASE ACROSS THE AREA FROM THE NORTHWEST ON 
TUESDAY AND INTO TUESDAY NIGHT.  BY WEDNESDAY THE TROUGH IS EXPECTED 
TO WEAKEN AND CLOSE OFF OVER NORTHERN ARIZONA.  MOISTURE WILL REMAIN 
ON WEDNESDAY FOR CHANCES OF VALLEY RAIN AND MOUNTAIN SNOW SHOWERS 
OVER THE AREA. 

SLC -111  CDC -11- TORONTO

.SLC...NONE.