Area Forecast Discussion
Issued by NWS Reno, NV

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FXUS65 KREV 201026
AFDREV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
226 AM PST TUE JAN 20 2015

.SYNOPSIS...

HIGH PRESSURE WILL BUILD OVER THE EASTERN PACIFIC THIS WEEK
EXPANDING OVER THE WEST COAST BY NEXT WEEKEND. TWO WEAK COOL FRONTS
WILL LOWER VALLEY TEMPERATURES THE NEXT COUPLE DAYS AIDING THE
DEVELOPMENT OF VALLEY INVERSIONS BY MID WEEK. DRY CONDITIONS MAY
PERSIST THROUGH LATE IN THE MONTH AS HIGH PRESSURE REMAINS NEAR THE
WEST COAST.

&&

.SHORT TERM...

NO CHANGES OF NOTE IN THE SHORT TERM PERIOD WITH A TRANQUIL
PATTERN IN PLACE. A SHORTWAVE DROPS SOUTH THROUGH CALIFORNIA
TODAY, PUSHING INTO THE DESERT SOUTHWEST BY WEDNESDAY. THIS
FEATURE IS LACKING IN MOISTURE AND THE BEST LIFT REMAINS WELL TO
THE SOUTH ACROSS SOUTHERN NEVADA AND NORTHERN ARIZONA. THE ONLY
REAL IMPACT IT WILL HAVE FOR THE SIERRA AND WESTERN NEVADA IS
PERIODS OF CLOUDS, ESPECIALLY SOUTH OF HIGHWAY 50.

A SURFACE HIGH BUILDS ACROSS THE NORTHERN ROCKIES TODAY INTO
WEDNESDAY INDUCING A NORTHEAST GRADIENT AND LIMITING MIXING. THIS
WILL SET UP WEAK VALLEY INVERSIONS WITH SEVERAL DEGREES OF COOLING
EXPECTED. DESPITE THE COOLING, HIGH TEMPERATURES WILL STILL BE
ABOUT 5 DEGREES ABOVE NORMAL, TRANSLATING TO UPPER 40S TO MID 50S
IN VALLEYS AND UPPER 30S TO LOW 40S IN THE MOUNTAINS WITH THE
COOLEST DAY ON WEDNESDAY.

ONE THING TO NOTE IS THAT INVERSIONS THIS WEEK WILL NOT BE AS
STRONG AS ONE MIGHT EXPECT IN JANUARY, DUE TO LACK OF SNOW COVER
AND NO SIGNIFICANTLY COLDER AIR ALREADY IN PLACE. WITH SURFACE AND
BOUNDARY LAYER HEATING THROUGH THE DAY, HAZE SHOULD LIFT A FEW
HUNDRED FEET OFF THE VALLEY FLOOR, WHICH WILL LIMIT THE EXTENT OF
THE WORST AIR QUALITY.

ANOTHER SHORTWAVE DROPS THROUGH CALIFORNIA LATE THURSDAY, BUT IS
FAIRLY MOISTURE STARVED JUST LIKE THE FIRST, SO ALL THAT IS
EXPECTED IS AN INCREASE IN CLOUDS THURSDAY AFTERNOON AND
OVERNIGHT. DJ

.LONG TERM...FRIDAY THROUGH MONDAY...

DRY CONDITIONS WITH ABOVE NORMAL TEMPERATURES WILL CONTINUE
THROUGH EARLY NEXT WEEK, AS STRONG RIDGE OFF THE WEST COAST ON
FRIDAY BUILDS INLAND DURING THE WEEKEND. ABOVE NORMAL TEMPERATURES
WILL CONTINUE WITH THE WARMEST DAYS LIKELY TO BE SUNDAY AND MONDAY
WHEN THE RIDGE CENTER MOVES OVER NEVADA. HIGHS IN THE WESTERN NV
AND SIERRA VALLEYS ARE EXPECTED TO SLOWLY WARM FROM THE MID 50S
FRIDAY TO THE LOWER 60S BY SUNDAY AND MONDAY. THIS UNUSUALLY WARM
PATTERN WILL ALSO BRING RIDGE LEVEL TEMPERATURES BETWEEN
8000-10000 FEET UP TO NEAR 50 DEGREES STARTING THIS WEEKEND,
RESULTING IN MORE LOSS OF AN ALREADY POOR SNOWPACK.

WHILE SURFACE WINDS WILL BE GENERALLY LIGHT, SOME INCREASE IN
NORTHEAST TO EAST RIDGE TOP WINDS IS POSSIBLE FRIDAY NIGHT THROUGH
SUNDAY. BASED ON THE LATEST GUIDANCE, WIND GUSTS IN HIGHER
ELEVATIONS COULD EXCEED 50 MPH AT TIMES, BUT A SIGNIFICANT RIDGE
WIND EVENT IS NOT EXPECTED. MJD

&&

.AVIATION...

VFR CONDITIONS WITH LIGHT WINDS TO CONTINUE FOR THE NEXT SEVERAL
DAYS. AREA OF THICKER CIRRUS CURRENTLY MOVING ACROSS THE SIERRA,
FOLLOWED BY EAST FLOW DEVELOPING ACROSS THE SIERRA BY LATE TONIGHT
SHOULD PREVENT SIGNIFICANT FZFG FORMATION AT KTRK FOR THE NEXT TWO
MORNINGS. MJD

&&

.REV WATCHES/WARNINGS/ADVISORIES...
NV...NONE.
CA...NONE.
&&

$$

FOR MORE INFORMATION FROM THE NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/RENO (ALL LOWER CASE)










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