404
FXUS66 KMFR 041927
AFDMFR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
1227 PM PDT THU JUN 4 2026
DISCUSSION
AFTER A SUBSTANTIAL MARINE PUSH THIS MORNING THAT
FILLED NEARLY ALL OF THE WEST SIDE VALLEYS WITH LOW CLOUDS AND
FOG, THE SKIES HAVE MOSTLY CLEARED WITH PLENTY OF SUNSHINE NOW
OVER SOUTHERN OREGON AND FAR NORTHERN CALIFORNIA.
TODAY AND TOMORROW (FRIDAY), WITH UPPER LEVEL FLOW IN A NEAR
ZONAL TO VERY LOW AMPLITUDE RIDGING PATTERN, DAYTIME HIGHS WILL
BE VERY NEAR TO JUST SLIGHTLY ABOVE NORMAL FOR EARLY JUNE, WITH
THE TYPICAL BREEZES IN THE AFTERNOON. CLOUD COVER INCREASES
TOMORROW AFTERNOON AS THE NEXT UPPER LEVEL TROUGH, CURRENTLY
SITTING JUST OFFSHORE OF BRITISH COLUMBIA, APPROACHES THE REGION.
THE TROUGH WILL DIG FARTHER INTO THE PACIFIC NORTHWEST SATURDAY,
AND WHILE THE CENTER OF LOW ITSELF PASSES OVER WASHINGTON, THE
TROUGH AXIS WILL SWING OVER OUR AREA LATE FRIDAY INTO SATURDAY,
BRINGING ANOTHER ROUND OF AFTERNOON GUSTY WINDS BOTH DAYS
(REMAINING WELL BELOW ANY THRESHOLDS), AND A SLIGHT CHANCE FOR
LIGHT SHOWERS OVER NORTHERN COOS AND DOUGLAS COUNTIES, AND MAYBE
SOME DRIZZLE ALONG THE REST OF THE COAST, ON SATURDAY. AREAS IN
MODOC, LAKE, AND KLAMATH COUNTIES WILL BE UNDER FROST/FREEZE
CONCERNS AGAIN SATURDAY NIGHT, WITH OVERNIGHT LOWS POTENTIALLY
DROPPING BELOW FREEZING IN NORTHERN KLAMATH AND LAKE COUNTIES.
OVERALL, TEMPERATURES SATURDAY WILL BE 5 TO 10 DEGREES BELOW
NORMAL.
ONCE THE TROUGH DEPARTS TO THE EAST, SEASONAL WARMTH RETURNS
UNDER SHORTWAVE RIDGING SUNDAY, THEN ANOTHER TROUGH ARRIVES LATE
MONDAY INTO TUESDAY. THE NATURE OF THIS TROUGH VARIES GREATLY
ACROSS THE MODEL SUITES IN BOTH TIMING AND TRACK, WITH SOME
PASSING THE CENTER OF A CLOSED LOW OVER WASHINGTON THEN INTO THE
NORTHERN ROCKIES, AND OTHERS DIGGING FARTHER SOUTH TO BRING THE
LOW OVER CENTRAL CALIFORNIA AND THE GREAT BASIN. BOTH WILL RESULT
IN SOMEWHAT COOL TEMPERATURES, BUT WILL VARY GREATLY IN
PRECIPITATION CHANCES AND NATURE: THE NORTHERLY TRACK TRENDING
MORE TOWARDS LIGHT SHOWER CHANCES, WHILE A SOUTHERLY TRACK LEADS
TO MUCH HIGHER SHOWER CHANCES ALONG WITH POTENTIAL THUNDERSTORMS.
AVIATION (18Z TAFS)
SATELLITE IMAGERY INDICATES LOW CLOUDS OVER THE UMPQUA BASIN WHICH
IS IMPACTING KRBG WITH MVFR CEILINGS. EXPECTING THIS DECK TO CLEAR
OUT WITH AFTERNOON MIXING. THEREAFTER, THIS SHOULD BE MOSTLY A VFR
TAF CYCLE AS THE AFTERNOON BRINGS DECENT MIXING AND BREEZY WIND
SPEEDS TODAY. THESE WILL BE DIURNALLY DRIVEN WITH SPEEDS DIMINISHING
AROUND SUNSET. EXPECTING A MARINE LAYER TONIGHT THAT COULD BRING
MVFR CONDITIONS (~40%) ALONG/NEAR THE COAST IMPACTING KOTH.
MARINE...UPDATED 1200 PM PDT THURSDAY, JUNE 4, 2026
NORTH
WINDS ARE INCREASING TODAY AS A THERMAL TROUGH DEVELOPS ALONG THE
COAST. BY LATE THIS EVENING, GUSTY WINDS AND STEEP WIND-DRIVEN SEAS
WILL COVER ALL BUT THE MOST SHELTERED WATERS SOUTH OF CAPE BLANCO.
CONDITIONS WILL IMPROVE BRIEFLY FRIDAY, THEN NORTH WINDS AND STEEP
WIND DRIVEN SEAS RETURN SATURDAY AFTERNOON INTO SUNDAY MORNING.
SOUTH WINDS WILL ACCOMPANY A FRONT ON MONDAY, BUT OTHERWISE
CONDITIONS SHOULD BE RELATIVELY CALM EARLY NEXT WEEK.
MFR WATCHES/WARNINGS/ADVISORIES
OR...CA...NONE.
PACIFIC COASTAL WATERS...SMALL CRAFT ADVISORY UNTIL 8 AM PDT FRIDAY
FOR PZZ356-376.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page