Weather Service Report


614 
FXUS65 KREV 262144
AFDREV

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RENO NV
244 PM PDT SUN APR 26 2015

.SYNOPSIS...
HIGH PRESSURE WILL BUILD AND PUSH TEMPERATURES WELL ABOVE NORMAL
EARLY THIS WEEK. TEMPERATURES WILL BREAK 80 DEGREES FOR MANY
WESTERN NEVADA VALLEYS WITH LOWER 70S IN THE SIERRA VALLEYS. A
WEAK TROUGH WILL DEVELOP NEAR THE WEST COAST FOR THE END OF THE
WEEK WITH TEMPERATURES COOLING A FEW DEGREES.

&&

.SHORT TERM...
UPPER RIDGE WILL BUILD INTO THE WEST COAST MONDAY AND THEN MOVE
ACROSS THE GREAT BASIN ON TUESDAY. NORTH WINDS SHOULD DIMINISH
TONIGHT ACROSS THE BASIN AND RANGE AND EASTERN SIERRA OF MONO
COUNTY AS THE SURFACE GRADIENT RELAXES. HOWEVER, AS WINDS TURN
EAST OVER THE RIDGES TONIGHT AND MONDAY MORNING, GUSTS WILL
APPROACH 50-55 MPH BEFORE RELAXING DURING THE DAY MONDAY. SO IT
WILL BE WINDY IN THE HIGH SIERRA TONIGHT INTO MONDAY MORNING. A
DRY AIRMASS WILL BE IN PLACE THROUGH TUESDAY WITH LARGE DIURNAL
SWINGS. WHILE OVERNIGHT LOWS WILL BE SLOW TO MODERATE, DAYTIME
HIGHS WILL PUSH 80 DEGREES BY TUE FOR WESTERN NV VALLEYS.

MODELS SHOW RIDGE FLATTENING LATE TUESDAY INTO WEDNESDAY AS
SHORTWAVE ENERGY PUSHES INTO THE PACNW. A MODEST INCREASE IN
SOUTHWEST FLOW ALOFT AND TIGHTENING SURFACE GRADIENT WILL BRING AN
INCREASE IN AFTERNOON AND EVENING WINDS FOR TUESDAY, MAINLY FROM
THE SIERRA FRONT NORTHWARD. IT DOES NOT LOOK THAT IMPRESSIVE BUT
WILL RESULT IN LOCALLY BREEZY WINDS BY MID AFTERNOON TUESDAY ALONG
THE HIGHWAY 395 CORRIDOR FROM RENO TO SUSANVILLE AND ACROSS THE
SURPRISE VALLEY. A WEAK COLD FRONT SLIDES SOUTHWARD IN NORTHEAST
CA AND NORTHERN NV ON WEDNESDAY. THIS WILL RESULT IN COOLING
TEMPERATURES, MAINLY NORTH OF I-80 WEDNESDAY AFTERNOON. THERE MAY
BE ENOUGH MOISTURE FOR A FEW SHOWERS ALONG THE FRONT WEDNESDAY
AFTERNOON. WE INTRODUCED A SLIGHT CHANCE FAR NORTHERN AREAS. ANY
PRECIPITATION WILL BE VERY LIGHT IF IT DOES OCCUR. HOHMANN

.LONG TERM...THURSDAY THROUGH SUNDAY...

MAIN FORECAST PROBLEM REMAINS THE POTENTIAL FOR THUNDERSTORMS AT THE 
END OF THE WEEK AND INTO THE WEEKEND. CUMULUS BUILD-UPS MAY START ON 
THURSDAY WITH INCREASING CHANCES FOR THUNDERSTORMS OVER THE WEEKEND 
AND THE BEGINNING OF NEXT WEEK IN THE SIERRA. CONFIDENCE REMAINS LOW 
ON THE TIMING, BUT IT CURRENTLY LOOKS LIKE THE BEST CHANCES WILL BE 
OVER THE WEEKEND. 

ON THURSDAY A VERY WEAK AREA OF LOW PRESSURE OFF THE CALIFORNIA 
COAST WILL BEGIN TO CREATE SOME UPPER LEVEL INSTABILITY OVER THE 
SIERRA. INSTABILITY IS WEAK BOTH THURSDAY AND FRIDAY WITH CUMULUS 
BUILD-UPS PROBABLE BUT ONLY AN OUTSIDE CHANCE FOR AN ELEVATED 
THUNDERSTORM OVER THE SIERRA, MAINLY SOUTH OF HIGHWAY 50. A BETTER 
CHANCE FOR THUNDERSTORMS COULD OCCUR OVER THE WEEKEND AS THE LOW 
BEGINS TO CLOSE OFF AND CREATE SOME DIFFLUENCE ALOFT. MODELS VARY 
CONSIDERABLY WITH THE TIMING AND EVOLUTION OF THIS FEATURE, BUT IT 
WILL BE SOMETHING TO KEEP AN EYE ON AS IT HAS POTENTIAL.

THE END OF THE WEEK WILL ALSO BRING SOME MINOR COOLING, BUT HIGH 
TEMPERATURES WILL REMAIN AROUND 6-8 DEGREES ABOVE NORMAL. BOTH 
TEMPERATURES AND WIND IN THE SIERRA WILL DEPEND ON THE EXTENT OF 
CUMULUS BUILD-UPS AND POTENTIAL THUNDERSTORMS. TOLBY

&&

.AVIATION...
VFR CONDITIONS AT ALL TERMINALS THROUGH MONDAY. LOCALLY BREEZY
NORTH WINDS THIS EVENING WILL BECOME LIGHT ON MONDAY. TOLBY

&&

.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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