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Saint Helena, California 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Saint Helena CA
National Weather Service Forecast for:
Saint Helena CA
Issued by: National Weather Service San Francisco Bay Area/Monterey, CA |
| Updated: 3:55 am PST Nov 24, 2024 |
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Today
Chance
Showers and
Patchy Dense
Fog then
Showers
Likely
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Tonight
Showers
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Monday
Rain
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Monday
Night
Rain Likely
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Tuesday
Chance Rain
and Patchy
Fog
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Tuesday
Night
Chance Rain
and Patchy
Fog
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Wednesday
Patchy Fog
then Sunny
|
Wednesday
Night
Mostly Clear
then Patchy
Frost
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Thanksgiving
Day
Areas Frost
then Mostly
Sunny
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| Hi 56 °F |
Lo 44 °F |
Hi 54 °F |
Lo 44 °F |
Hi 57 °F |
Lo 38 °F |
Hi 60 °F |
Lo 35 °F |
Hi 60 °F |
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Today
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Showers likely, mainly after 1pm. Patchy dense fog between 8am and 9am. Otherwise, mostly cloudy, with a high near 56. Light east southeast wind becoming south southeast 6 to 11 mph in the morning. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible. |
Tonight
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Showers, mainly before 10pm, then rain likely after 10pm. Low around 44. East wind 5 to 9 mph becoming light east northeast after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible. |
Monday
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Rain. High near 54. Southeast wind 6 to 13 mph, with gusts as high as 18 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible. |
Monday Night
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Rain likely, mainly before 10pm. Cloudy, with a low around 44. South southeast wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible. |
Tuesday
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A 40 percent chance of rain. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 57. Calm wind becoming west northwest 5 to 7 mph in the morning. New precipitation amounts between a tenth and quarter of an inch possible. |
Tuesday Night
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A 30 percent chance of rain, mainly before 10pm. Patchy fog after 4am. Otherwise, partly cloudy, with a low around 38. New precipitation amounts of less than a tenth of an inch possible. |
Wednesday
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Patchy fog before 7am. Otherwise, sunny, with a high near 60. |
Wednesday Night
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Patchy frost after 3am. Otherwise, mostly clear, with a low around 35. |
Thanksgiving Day
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Areas of frost before 8am. Otherwise, mostly sunny, with a high near 60. |
Thursday Night
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Mostly cloudy, with a low around 38. |
Friday
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Partly sunny, with a high near 61. |
Friday Night
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Partly cloudy, with a low around 40. |
Saturday
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Mostly sunny, with a high near 62. |
Forecast from NOAA-NWS
for Saint Helena CA.
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Weather Forecast Discussion
726
FXUS66 KMTR 241146
AFDMTR
Area Forecast Discussion
National Weather Service San Francisco CA
346 AM PST Sun Nov 24 2024
...New AVIATION...
.SYNOPSIS...
Issued at 333 AM PST Sun Nov 24 2024
Wet weather continues through the early portion of the work week.
Showers are in the forecast for today as a weak trough passes
through. Low pressure forms over the Pacific Monday into Tuesday,
which will bring widespread rain to the region. Drier weather may
try to make a brief appearance for Thanksgiving, with drier weather
expected as we wrap the month up.
&&
.SHORT TERM...
(Today and tonight)
Issued at 333 AM PST Sun Nov 24 2024
A weak trough skirts over the region today giving us a mix of sun
and clouds. Showers will be possible across the region, with favor
being given to the North Bay region. Southerly winds, especially
over the North Bay and San Francisco Peninsula, will flare up some,
but remain below advisory criteria. Chances for rain will gradually
increase late Sunday into Monday.
&&
.LONG TERM...
(Monday through Saturday)
Issued at 333 AM PST Sun Nov 24 2024
Ensemble and cluster analysis shows an a shortwave trough passing
through the region during the first half of the week. Low pressure
forms to the west over the Pacific, setting up a frontal boundary
feeding moisture into the region. Currently, guidance continues
to favor the placement of this boundary near the Santa Lucias, but
it has wobbled along the Central Coast. Given this
information, opted to keep the higher rainfall amounts along the
Central Coast and Santa Clara County. Should the boundary shift,
amounts will likely shift some. Expect wet weather from Monday into
Tuesday.
From midweek into the weekend, clusters show weak upper level trough
off to our west, with weak ridging trying to form. Thoughts are that
showers should be tapering off from north to south late Tuesday into
Wednesday. Dry weather looks favorable for Thursday, with perhaps a
renewed chance for pop up showers on Friday. As we wrap up the
month, ensembles and clusters favor upper level ridging leading to
drier weather as we head into December.
&&
.AVIATION...
(12Z TAFS)
Issued at 339 AM PST Sun Nov 24 2024
Mixed bag this morning given ample low level moisture and light
winds. Patchy fog continues to impact KHAF and KSTS. This will be
the case through 15-17Z this morning, poss longer at KHAF. KSJC is
also seeing some low cigs sneaking in from the S. Will keep it
300 feet,but they`re patchy and few003 may happen at times.
Generally VFR this afternoon with hit or miss isolated showers
with southerly flow. Better chance for cigs/rain closer to the 12Z
time period on Monday.
Vicinity of SFO...VFR with light to SE flow through this
afternoon. Cigs around 3500-5000 feet poss. A few showers after
00Z then rain return for the AM rush on Monday.
SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...VFR with SE flow through this afternoon.
Better chc for showers this evening and rain returning after 08Z
Monday.
&&
.MARINE...
Issued at 333 AM PST Sun Nov 24 2024
Another storm system over the Eastern Pacific will bring gusty
winds and more rain to the region. Southerly winds will be
strongest north of Point Reyes on Sunday before increasing across
all coastal waters late Sunday night and Monday. The increasing
winds will result in hazardous conditions for small crafts with
steep wind waves.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 3 PM PST Monday for Pt Arena to Pt
Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM.
Small Craft Advisory from 9 AM this morning to 3 PM PST Monday
for Pt Reyes to Pigeon Pt 0-10 nm.
Small Craft Advisory from 3 AM to 3 PM PST Monday for Pigeon Pt
to Pt Pinos 0-10 nm-Pigeon Pt to Pt Pinos 10-60 NM-Pt Pinos
to Pt Piedras Blancas 0-10 nm.
&&
$$
SHORT TERM...KR
LONG TERM....KR
AVIATION...MM
MARINE...MM
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