704  
FXUS66 KMFR 310543  
AFDMFR  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE MEDFORD OR  
1043 PM PDT SUN MAR 30 2025  
 
UPDATED AVIATION DISCUSSION  
   
DISCUSSION
 
/ISSUED 220 PM PDT SUN MAR 30 2025/  
A COMPACT SURFACE LOW IS EVIDENT ON SATELLITE  
IMAGERY THIS AFTERNOON, LOCATED DIRECTLY WEST OF BROOKINGS AS OF  
THE TIME OF THIS WRITING. THIS LOW IS TRACKING JUST AS THE HIGH-  
RESOLUTION MODELS DEPICTED EARLIER TODAY, AND IS ON TRACK TO PASS  
JUST OFFSHORE OF SOUTHERN OREGON AND MOVE ONSHORE AROUND CAPE  
BLANCO OR PERHAPS A BIT TO THE NORTH. THIS LOW IS RESPONSIBLE FOR  
SIGNIFICANT WIND CONCERNS TODAY, AND WE HAVE BEEN WATCHING  
COASTAL AND MARINE WIND GUSTS SPREAD NORTH FROM CAPE MENDOCINO  
THROUGHOUT THE DAY SO FAR. WINDS AT THE MARINE BUOYS AND POINTS  
ALONG THE COAST HAVE SEEN DRAMATIC INCREASES IN VERY SHORT  
PERIODS OF TIME. MEANWHILE, INLAND WINDS HAVE RESPONDED TO A  
STRONG MSLP GRADIENT, AND ENHANCED WITH MOMENTUM TRANSFER DUE TO  
SHOWERS AND MOUNTAIN WAVE EFFECTS, MID LEVEL WINDS HAVE TRANSLATED  
TO THE SURFACE AS GUSTS. IT HAS BEEN A CHALLENGE TO NAIL DOWN THE  
DETAILS OF WHERE WINDS WILL OCCUR, AS CHANGES IN THE LOW TRACK BY  
JUST A FEW MILES CAN AND HAVE BEEN MAKING SIGNIFICANT EFFECTS ON  
VARIOUS AREAS. FOR INSTANCE, THE LOW TRACKING JUST SLIGHTLY CLOSER  
TO THE COAST HAS ENHANCED THE INLAND WINDS, WHILE SIMULTANEOUSLY  
REDUCING THE EXPECTED WINDS ALONG THE COAST NORTH OF CAPE BLANCO.  
THE STRONGEST WINDS SHOULD WEAKEN ONCE THE LOW PASSES, WHILE  
OVERALL, WINDS WILL TAPER OFF THROUGH THE EVENING. NUMEROUS WIND  
HEADLINES REMAIN IN EFFECT FOR MUCH OF THE AREA, AND DETAILS ON  
THESE CAN BE FOUND AT PDXNPWMFR. A HIGH WIND WARNING FOR COASTAL  
AREAS AND WIND ADVISORIES FOR INLAND AREAS ARE IN PLACE INTO THIS  
EVENING TO HIGHLIGHT POSSIBLE HAZARDOUS CONDITIONS. ADDITIONALLY,  
THIS FRONT WILL BRING SLIGHT THUNDERSTORM CHANCES (10-15%) ALONG  
THE OREGON COAST THIS EVENING AND TONIGHT WITH LESSER CHANCES FOR  
INLAND AREAS WEST OF THE CASCADES. AND OF COURSE, ANY  
THUNDERSTORMS ARE LIKELY TO PRODUCE ADDITIONAL PERIODS OF LOCALLY  
GUSTY WINDS.  
 
IMPACTFUL CONDITIONS TURN FROM WIND TO WINTER ON MONDAY AND  
TUESDAY. WITH THE FRONT OFF TO THE NORTH, A LOW PRESSURE SYSTEM  
WILL DRAW CLOSER TO THEN MOVE OVER THE AREA. A COLD AIR MASS  
MOVING WITH THIS SYSTEM WILL BRING COOLER TEMPERATURES AND LOWER  
SNOW LEVELS ACROSS THE AREA. SOUTHWESTERLY FLOW ALOFT WILL  
CONTINUE TO BRING PRECIPITATION ACROSS THE AREA. SNOW LEVELS ARE  
FORECAST TO DROP TO 2500-3500 FEET THROUGH MONDAY AND TUESDAY,  
WITH HAZARDOUS WINTER WEATHER POSSIBLE IN CERTAIN AREAS. A WINTER  
STORM WATCH HAS BEEN UPGRADED TO A WINTER STORM WARNING FOR AREAS  
IN SISKIYOU COUNTY ABOVE 4500 FEET, AND WILL BE IN PLACE FROM  
EARLY MONDAY MORNING THROUGH TUESDAY EVENING. PEAKS AND RIDGELINES  
IN SISKIYOU COUNTY COULD GET 1 TO 3 FEET OF SNOW THROUGH THIS  
TIMEFRAME. SAWYERS BAR ROAD WEST OF ETNA COULD SEE OVER 2 FEET OF  
SNOW IN PLACES. A WINTER WEATHER ADVISORY COVERS THE CASCADES AND  
MOUNT ASHLAND IN THE SAME TIMEFRAME, WITH 12 TO 24 INCHES OF  
SNOWFALL POSSIBLE IN THESE AREAS. A SHORTER WINTER WEATHER  
ADVISORY IS IN PLACE FOR AREAS ALONG I-5 SOUTH OF WEED AND HIGHWAY  
89 FROM TUESDAY MORNING THROUGH TUESDAY EVENING. SNOW LEVELS ARE  
FORECAST TO REACH THEIR LOWEST IN THIS PERIOD, POSSIBLY BRINGING  
IMPACTFUL SNOWFALL TO THESE HIGHWAYS AND CITIES IN THIS AREA.  
ADDITIONALLY, SNOW AMOUNTS TO THE EAST OF THE CASCADES WILL JUST  
REACH ADVISORY CRITERIA, ALTHOUGH SPREAD OUT OVER MONDAY AND  
TUESDAY. ANOTHER WINTER WEATHER ADVISORY HAS BEEN ISSUED THERE,  
WITH MENTION OF MORE GUSTY WINDS THAT COULD RESULT FROM THE  
EXPECTED SHOWERS.  
 
FOR OTHER AREAS, GENERALLY LIGHT TO MODERATE PRECIPITATION  
CONTINUES ON MONDAY AND TUESDAY. INCREASED THUNDERSTORM CHANCES  
(15-25%) ARE FORECAST FOR AREAS WEST OF THE WEST OF THE CASCADES  
ON MONDAY AFTERNOON. CURRY AND JOSEPHINE COUNTIES MAY SEE A PERIOD  
OF INCREASED PRECIPITATION ON TUESDAY MORNING. GUSTY SOUTHWEST  
WINDS ARE FORECAST TO CONTINUE OVER ELEVATED TERRAIN, BUT THAT  
CHANGE OF DIRECTION WILL PREVENT FURTHER FUNNELING INTO THE SHASTA  
AND ROGUE VALLEYS.  
 
ACTIVE BUT LESS IMPACTFUL WEATHER CONTINUES ON WEDNESDAY, AS AN  
UPPER TROUGH MOVES OVER THE AREA. NORTHWEST FLOW ALONG THE BACK  
EDGE OF THE TROUGH COULD BRING CONTINUING SHOWERS AND COOL  
TEMPERATURES ON WEDNESDAY AND THURSDAY. AS THE UPPER PATTERN  
CONTINUES TO MOVE EASTWARD, A HIGH PRESSURE SYSTEM COULD SETTLE  
OVER THE AREA WHILE LOW PRESSURE REMAINS OVER THE SOUTHWEST UNITED  
STATES. THIS REX BLOCK PATTERN (HIGH PRESSURE POLEWARD/NORTH OF A  
LOW PRESSURE SYSTEM) COULD BRING A PERIOD OF WARMER TEMPERATURES  
AND DRIER CONDITIONS. METEOGRAM GUIDANCE SUPPORTS THIS, WITH BOTH  
ECMWF AND GFS OUTCOMES SHOWING AN ABSENCE OF PRECIPITATION FOR THE  
FIRST WEEKEND OF APRIL AND ONLY WEAK SIGNALS FOR THE WEEK BEYOND.  
-BPN/TAD  
 

 
   
AVIATION...31/06Z TAFS
 
WINDS HAVE CALMED DOWN IN THE VALLEYS  
THROUGH THE EVENING AND THAT IS ANTICIPATED TO CONTINUE TONIGHT.  
THERE WILL BE PLENTY OF RAIN SHOWERS THROUGH TONIGHT AS COLD MOIST  
AIR SURGES INTO THE FORECAST AREA. SHOWERS, AND PERHAPS A STRAY  
THUNDERSTORM, WILL REMAIN A PERSISTENT FEATURE INTO THE OVERNIGHT  
HOURS WEST OF THE CASCADES. VFR CEILINGS REMAIN MOST LIKELY THROUGH  
THE TAF PERIOD WITH POCKETS OF MVFR CEILINGS DEVELOPING UNDER  
POCKETS OF HEAVIER SHOWERS OR PERHAPS WEAK THUNDERSTORMS ON MONDAY.  
 
SNOW IS ANTICIPATED EAST OF THE CASCADES MONDAY EVENING AS  
TEMPERATURES COOL OFF INTO THE EVENING HOURS. ACCUMULATION SHOULD BE  
NO MORE THAN 2 INCHES WITHIN KLMT.  
 
-SMITH  
 

 
   
MARINE...UPDATED 1000 PM SUNDAY, MARCH 30, 2025
 
SEAS STILL  
REMAIN HIGH AND STEEP AS OF THIS SUNDAY EVENING AND THEY WILL LIKELY  
PUSH HIGHER INTO MONDAY. SEAS WILL BE HAZARDOUS TO SMALLER CRAFTS  
AND PERHAPS SOME LARGER CRAFTS AS WAVE HEIGHTS BEGIN TO PUSH HIGHER  
TOWARDS 16 FEET AT 11 OR 10 SECONDS AROUND MONDAY EVENING.  
 
EXPECT SHOWERS TO CONTINUE, ALONG WITH A SLIGHT CHANCE OF  
THUNDERSTORMS. A TAPERING TO STEEP SEAS FOLLOWS LATE TUESDAY MORNING  
THROUGH TUESDAY EVENING. GRADUAL IMPROVEMENT IS EXPECTED TO CONTINUE  
TUESDAY NIGHT INTO THE END OF THE WEEK WITH LIGHT TO MODERATE  
NORTHERLY WINDS. -SPILDE/SMITH  
 

 
 
   
MFR WATCHES/WARNINGS/ADVISORIES
 
 
OR...WINTER WEATHER ADVISORY FROM 11 PM MONDAY TO 5 PM PDT TUESDAY  
FOR ORZ027>031.  
 
CA...WINTER STORM WARNING UNTIL 5 PM PDT TUESDAY FOR CAZ080-082-083.  
 
WINTER WEATHER ADVISORY FROM 11 PM MONDAY TO 5 PM PDT TUESDAY  
FOR CAZ082-085.  
 
PACIFIC COASTAL WATERS...HAZARDOUS SEAS WARNING UNTIL 8 AM PDT  
TUESDAY FOR PZZ350-356-370-376.  
 

 
 

 
 
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