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Weather Alerts for San Francisco

Issued by the National Weather Service

Heat Advisory  HEAT ADVISORY   Heat Advisory
SAN FRANCISCO

Areas Affected:
Northern Monterey Bay - San Francisco - Southern Monterey Bay and Big Sur Coast
Effective: Sat, 8/15 10:00am Updated: Sat, 8/15 10:00am Urgency: Expected
Expires: Sat, 8/15 9:00pm Severity: Minor Certainty: Likely

 
Details:
...Extended Heat today through Wednesday across the San Francisco
Bay Area and Central Coast...
.A long duration heat wave will impact the region through at
least Wednesday of next week, and possibly beyond. Excessive heat
will target interior locations for the full duration of the heat
event, with persistent daily afternoon highs in the upper 90s to
mid 100s across the interior. Drastic temperature differences
will exist from the coast to the interior and communities just a
few to several miles inland may experience rapid warming into the
upper 80s to 90s on individual days. In addition, minimal
overnight relief is expected for locations above 500 feet where
warm overnight lows will hover in the upper 60s to low 80s. Due to
the long duration of this event, accumulating heat stress will be
a significant impact for the general public, pets, vegetation,
and livestock across the region, particularly those sensitive to
the heat. Relatively cooler conditions are expected to persist
near the immediate coast with highs in the 70s to 80s, though wind
sheltered coastal areas could rise into the 90s or even locally
100 on the hottest days.
...HEAT ADVISORY IN EFFECT FROM 10 AM TO 9 PM PDT SATURDAY...
* WHAT...Rapid warming possible late morning to early afternoon
into the upper 80s to mid 90s, locally higher in areas sheltered
from the onshore winds by the mid to late afternoon.
* WHERE...San Francisco, Northern Monterey Bay and Southern
Monterey Bay and Big Sur Coast.
* WHEN...From 10 AM to 9 PM PDT Saturday.
* IMPACTS...Elevated heat will increase the potential for heat
related illnesses, particularly among vulnerable populations
and those working outdoors or in areas without air
conditioning.
* ADDITIONAL DETAILS...Winds shift onshore by the mid afternoon
for the Monterey Bay, Big Sur, and City of San Francisco,
allowing for limited cooling relief for these nearshore and
alongshore zones. Temperatures are not expected to be as high as
they were on Friday. Further cooling is expected on Sunday.
Temperatures are expected to increase once again early to mid
week next week and additional heat advisories may be necessary
during this time frame.

Information:
Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.
Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

Fire Weather Watch  FIRE WEATHER WATCH   Fire Weather Watch
SAN FRANCISCO

Areas Affected:
Coastal North Bay Including Point Reyes National Seashore - East Bay Hills and the Diablo Range - East Bay Interior Valleys - North Bay Interior Valleys - North Bay Mountains - Northern Monterey Bay - San Francisco - San Francisco Bay Shoreline - San Fransisco Peninsula Coast - Santa Clara Valley Including San Jose - Santa Cruz Mountains
Effective: Sat, 8/15 11:00pm Updated: Sat, 8/15 10:00am Urgency: Future
Expires: Sun, 8/16 11:00pm Severity:  Moderate  Certainty: Possible

 
Details:
...POTENTIAL FOR ISOLATED DRY LIGHTNING LATE SATURDAY INTO EARLY
SUNDAY...
.Moist unstable air will bring a slight chance for fast moving
high based storms with little to no accompanying wetting rains.
This air mass will move roughly from south to north beginning in
the Central Coast this afternoon/evening before transitioning
into the Bay Area overnight into early Sunday. Given dry fuels
and hot dry conditions near the surface, dry lightning can
directly lead to wildfire starts. Onshore winds near the coast
late Saturday may lead to additional complications for any fire
starts in proximity to the sea breeze.
...FIRE WEATHER WATCH IN EFFECT FROM THIS EVENING THROUGH SUNDAY
EVENING FOR ISOLATED DRY LIGHTNING FOR FIRE WEATHER ZONES
006...505... 506...507...508...509...510...511...512...513 AND
529...
THE NATIONAL WEATHER SERVICE IN San Francisco HAS ISSUED a Fire
Weather Watch...WHICH IS IN EFFECT from this evening through
Sunday evening.
* AFFECTED AREA...FIRE WEATHER ZONES 006...505...506...507...
508...509...510...511...512...513 AND 529.
* WIND...Light wind except for breezy onshore winds in the
afternoon near the coast.
* HUMIDITY...Minimum humidity mid 10s to mid 20s percent across
the higher elevations and interior & 30 to 50 percent nearshore
and lower elevation for today. Recoveries Saturday night in the
30s to 50s across the interior and 60s to 90s alongshore.
* THUNDERSTORMS...High base, fast moving storms will lead to a
risk of isolated dry lightning strikes through the period.
* IMPACTS...Increase in wildfire starts in proximity to
thunderstorms due to isolated dry lightning. Fires may spread
rapidly due to dry fuels and, if nearshore, breezy onshore
winds. Outdoor burning is not recommended.

Information:
A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

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