Area Forecast Discussion
FXUS66 KMTR [Monterey CA] 252021 AFDMTR ∨
FXUS66 KMTR 252021 AFDMTR [HEAD]
National Weather Service San Francisco Bay Area 1:21pm PDT Tue Apr 25 2017 ∨
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 121 PM PDT TUE APR 25 2017 [HEAD]
Synopsis. Seasonably cool temperatures will persist into Wednesday as a weak system passes inland to the north. This will result in a slight chance of light precipitation, mainly from the Santa Cruz Mountains northward into Wednesday. A warming and drying trend will then get underway beginning Thursday and likely continuing into the upcoming weekend as high pressure builds over the eastern Pacific. Breezy northerly winds are also possible from Thursday into Friday, especially in the hills. ∨
.SYNOPSIS...SEASONABLY COOL TEMPERATURES WILL PERSIST INTO WEDNESDAY AS A WEAK SYSTEM PASSES INLAND TO THE NORTH. THIS WILL RESULT IN A SLIGHT CHANCE OF LIGHT PRECIPITATION, MAINLY FROM THE SANTA CRUZ MOUNTAINS NORTHWARD INTO WEDNESDAY. A WARMING AND DRYING TREND WILL THEN GET UNDERWAY BEGINNING THURSDAY AND LIKELY CONTINUING INTO THE UPCOMING WEEKEND AS HIGH PRESSURE BUILDS OVER THE EASTERN PACIFIC. BREEZY NORTHERLY WINDS ARE ALSO POSSIBLE FROM THURSDAY INTO FRIDAY, ESPECIALLY IN THE HILLS. [DISC]
Discussion. As of 01:20pm PDT Tuesday… deep moisture aloft continues to advect inland across the region this afternoon and has resulted in widespread mid/high level cloudiness. All of this is in advance of a weak mid/upper level trough that will push inland into the Pacific Northwest late tonight into Wednesday. This system may bring some very light precipitation to the northern portion of our region, mainly from the Santa Cruz Mountains northward early Wednesday morning. Cannot rule out some lingering showers into the early afternoon from the East Bay hills down into the Santa Lucia Mountains, yet chances for widespread measurable rainfall remain minimal as this system lacks needed mid/upper level support as it pushes inland to our north. With this passing system, temperatures will be seasonably cool and temperatures will range from the lower 06s coast to middle 60s inland through Wednesday. Some of the warmer, interior locations of the Central Coast may warm into the lower 70s. ∨
.DISCUSSION...AS OF 01:20 PM PDT TUESDAY...DEEP MOISTURE ALOFT CONTINUES TO ADVECT INLAND ACROSS THE REGION THIS AFTERNOON AND HAS RESULTED IN WIDESPREAD MID/HIGH LEVEL CLOUDINESS. ALL OF THIS IS IN ADVANCE OF A WEAK MID/UPPER LEVEL TROUGH THAT WILL PUSH INLAND INTO THE PACIFIC NORTHWEST LATE TONIGHT INTO WEDNESDAY. THIS SYSTEM MAY BRING SOME VERY LIGHT PRECIPITATION TO THE NORTHERN PORTION OF OUR REGION, MAINLY FROM THE SANTA CRUZ MOUNTAINS NORTHWARD EARLY WEDNESDAY MORNING. CANNOT RULE OUT SOME LINGERING SHOWERS INTO THE EARLY AFTERNOON FROM THE EAST BAY HILLS DOWN INTO THE SANTA LUCIA MOUNTAINS, YET CHANCES FOR WIDESPREAD MEASURABLE RAINFALL REMAIN MINIMAL AS THIS SYSTEM LACKS NEEDED MID/UPPER LEVEL SUPPORT AS IT PUSHES INLAND TO OUR NORTH. WITH THIS PASSING SYSTEM, TEMPERATURES WILL BE SEASONABLY COOL AND TEMPERATURES WILL RANGE FROM THE LOWER 06S COAST TO MIDDLE 60S INLAND THROUGH WEDNESDAY. SOME OF THE WARMER, INTERIOR LOCATIONS OF THE CENTRAL COAST MAY WARM INTO THE LOWER 70S. [DISC]
A warming trend will then get underway by Thursday as dry conditions return along with mostly sunny skies. As a stronger mid/upper level low drops southward out of Canada into the Rockies and high pressure develops offshore late in the week, temperatures will warm into the 70s inland. In addition, breezy to locally gusty winds will develop due to the tightening pressure gradient from Thursday into Friday. Further warming of the air mass aloft will result in lower 80s during the afternoon hours this weekend while onshore winds near the coast keep temperatures in the 60s to 70s. ∨
A WARMING TREND WILL THEN GET UNDERWAY BY THURSDAY AS DRY CONDITIONS RETURN ALONG WITH MOSTLY SUNNY SKIES. AS A STRONGER MID/UPPER LEVEL LOW DROPS SOUTHWARD OUT OF CANADA INTO THE ROCKIES AND HIGH PRESSURE DEVELOPS OFFSHORE LATE IN THE WEEK, TEMPERATURES WILL WARM INTO THE 70S INLAND. IN ADDITION, BREEZY TO LOCALLY GUSTY WINDS WILL DEVELOP DUE TO THE TIGHTENING PRESSURE GRADIENT FROM THURSDAY INTO FRIDAY. FURTHER WARMING OF THE AIR MASS ALOFT WILL RESULT IN LOWER 80S DURING THE AFTERNOON HOURS THIS WEEKEND WHILE ONSHORE WINDS NEAR THE COAST KEEP TEMPERATURES IN THE 60S TO 70S. [DISC]
Temperatures moderate slightly by early next week as the mid/upper level ridge weakens as a system pushes inland into the Pacific Northwest. With that said, the main storm track will remain well north of the region and dry weather conditions are likely into the beginning of May. ∨
TEMPERATURES MODERATE SLIGHTLY BY EARLY NEXT WEEK AS THE MID/UPPER LEVEL RIDGE WEAKENS AS A SYSTEM PUSHES INLAND INTO THE PACIFIC NORTHWEST. WITH THAT SAID, THE MAIN STORM TRACK WILL REMAIN WELL NORTH OF THE REGION AND DRY WEATHER CONDITIONS ARE LIKELY INTO THE BEGINNING OF MAY. [DISC]
Aviation. As of 10:19am PDT Tuesday… mid and high level clouds continue to stream in from the north ahead of the next system. Expecting VFR [Visual Flight Rules] today with breezy conditions. Ceilings will gradually lower overnight with light rain possible at KSTS [Santa Rosa CA] early Wednesday, but will only do VCSH [Rain Showers in the Vicinity] for KOAK [Oakland CA] and KSFO [San Francisco CA]. ∨
.AVIATION...AS OF 10:19 AM PDT TUESDAY...MID AND HIGH LEVEL CLOUDS CONTINUE TO STREAM IN FROM THE NORTH AHEAD OF THE NEXT SYSTEM. EXPECTING VFR TODAY WITH BREEZY CONDITIONS. CIGS WILL GRADUALLY LOWER OVERNIGHT WITH -RA POSS AT KSTS EARLY WED, BUT WILL ONLY DO VCSH FOR KOAK AND KSFO. [AVIA]
Vicinity of KSFO [San Francisco CA]… little change from previous forecast. VFR [Visual Flight Rules] through today. MVFR [Marginal Visual Flight Rules] ceilings develop tonight/early Wednesday. A passing shower possible early Wednesday. ∨
VICINITY OF KSFO...LITTLE CHANGE FROM PREVIOUS FORECAST. VFR THROUGH TODAY. MVFR CIGS DEVELOP TONIGHT/EARLY WEDNESDAY. A PASSING SHOWER POSS EARLY WEDNESDAY. [AVI2]
SFO [San Francisco CA] bridge approach… similar to KSFO [San Francisco CA]. ∨
SFO BRIDGE APPROACH...SIMILAR TO KSFO. [AVI2]
Monterey Bay terminals… VFR [Visual Flight Rules]. Afternoon sea breeze. Lower ceilings return tonight with MVFR [Marginal Visual Flight Rules] category. ∨
MONTEREY BAY TERMINALS...VFR. AFTERNOON SEA BREEZE. LOWER CIGS RETURN TONIGHT WITH MVFR CATEGORY. [AVI2]
Marine. As of 10:17am PDT Tuesday… moderate to locally strong northerly winds will prevail as high pressure remains anchored off the coast. The strongest winds will likely occur Monterey Bay southward along the immediate coast. Winds and seas will increase over all coastal waters on Wednesday as high pressure strengthens. ∨
.MARINE...AS OF 10:17 AM PDT TUESDAY...MODERATE TO LOCALLY STRONG NORTHERLY WINDS WILL PREVAIL AS HIGH PRESSURE REMAINS ANCHORED OFF THE COAST. THE STRONGEST WINDS WILL LIKELY OCCUR MONTEREY BAY SOUTHWARD ALONG THE IMMEDIATE COAST. WINDS AND SEAS WILL INCREASE OVER ALL COASTAL WATERS ON WEDNESDAY AS HIGH PRESSURE STRENGTHENS. [AVIA]
.MTR WATCHES/WARNINGS/ADVISORIES... .TNGT...SCA...MRY BAY UNTIL 9 PM SCA...PIGEON PT TO PT PINOS 0-10 NM UNTIL 9 PM SCA...PT PINOS TO PT PIEDRAS BLANCAS 0-10 NM [WARN]
Public Forecast: Rgass; Aviation: MM; Marine: MM ∨
PUBLIC FORECAST: RGASS AVIATION: MM MARINE: MM [CRED]
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Half Moon Bay Airport
25 Apr 2:55pm PDT
Tonight Mostly cloudy, with a low around 51°. NW wind 8 to 17 mph, with gusts as high as 22 mph.
Wednesday A 20% chance of showers before 11am. Partly sunny, with a high near 61°. West wind around 6 mph becoming SSW in the morning.
Wednesday Night Partly cloudy, with a low around 51°. NW wind around 15 mph, with gusts as high as 18 mph.
Thursday Mostly sunny, with a high near 61°. Breezy, with a NNW wind 17 to 22 mph decreasing to 10 to 15 mph in the morning. Winds could gust as high as 28 mph.
Thursday Night Mostly clear, with a low around 49°. NW wind around 15 mph, with gusts as high as 18 mph.
Friday Sunny, with a high near 63°.
Friday Night Mostly clear, with a low around 49°.
Saturday Sunny, with a high near 65°.
Saturday Night Mostly clear, with a low around 51°.
Sunday Sunny, with a high near 65°.
Sunday Night Mostly clear, with a low around 52°.
Monday Sunny, with a high near 65°.
Monday Night Mostly clear, with a low around 51°. Breezy.
Tuesday Sunny, with a high near 66°.
Mostly cloudy, with a low around 51. Northwest wind 8 to 17 mph, with gusts as high as 22 mph.
A 20 percent chance of showers before 11am. Partly sunny, with a high near 61. West wind around 6 mph becoming south southwest in the morning.
Partly cloudy, with a low around 51. Northwest wind around 15 mph, with gusts as high as 18 mph.
Mostly sunny, with a high near 61. Breezy, with a north northwest wind 17 to 22 mph decreasing to 10 to 15 mph in the morning. Winds could gust as high as 28 mph.
Mostly clear, with a low around 49. Northwest wind around 15 mph, with gusts as high as 18 mph.
Sunny, with a high near 63.
Mostly clear, with a low around 49.
Sunny, with a high near 65.
Mostly clear, with a low around 51.
Sunny, with a high near 65.
Mostly clear, with a low around 52.
Sunny, with a high near 65.
Mostly clear, with a low around 51. Breezy.
Sunny, with a high near 66.