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2 products issued by NWS for: 2 Miles ENE Walnut Creek CA
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Heat Advisory

URGENT - WEATHER MESSAGE
National Weather Service San Francisco Bay Area
602 AM PDT Sun Sep 27 2020

...Increased risk of heat related illness Sunday and Monday as
high pressure strengthens over the region...

.High pressure is forecast to strengthen over the region from the
eastern Pacific Ocean and result in an increased risk of heat
related illness from Sunday into Monday. Offshore winds
associated with this high pressure system will amplify these
increasing temperatures by suppressing the afternoon sea breeze
and marine layer while forcing hotter inland air westward towards
the coast. Monday is forecast to be hotter than Sunday with
forecast highs generally in the mid 90s to low 100s, roughly
15 to 25 degrees above normal. Limited onshore flow is
anticipated to return later Monday but is not expected to arrive
prior to the peak heating midday.

CAZ006-505>508-510>513-280500-
/O.CON.KMTR.HT.Y.0006.200927T1800Z-200929T0200Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
San Francisco Bay Shoreline-East Bay Interior Valleys-
East Bay Hills and the Diablo Range-Santa Cruz Mountains-
Santa Clara Valley Including San Jose-
Including the cities of San Francisco, Tamalpais-Homestead,
Sausalito, Santa Rosa, South Santa Rosa, Napa, San Rafael,
Petaluma, Novato, Rohnert Park, Angwin, Lagunitas-Forest Knolls,
Woodacre, Oakland, Fremont, Hayward, Daly City, Berkeley,
Concord, Antioch, Livermore, Walnut Creek, Pleasanton, Pittsburg,
San Ramon, Blackhawk, Scotts Valley, Boulder Creek, Day Valley,
and San Jose
602 AM PDT Sun Sep 27 2020

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
7 PM PDT MONDAY...

* WHAT...High temperatures are forecast to range from 15 to 25
  degrees above normal Sunday and Monday. Inland temperatures are
  forecast to range in the mid 90s to low 100s on both Sunday and
  Monday. Bayshore locations including Oakland and San Francisco
  are forecast to warm into the upper 80s to around 90 on Sunday
  and in the lower to mid 90s on Monday.

* WHERE...Majority of the San Francisco Bay Area.

* WHEN...11 AM Sunday to 7 PM PDT Monday.

* IMPACTS...Increased risk of heat related illnesses such as
  heat exhaustion and heat stroke can occur due to prolonged
  exposure to hot temperatures. People most vulnerable include
  those who spend extended periods outdoors, those without air
  conditioning, young children, the elderly, and those with
  chronic illness.

* ADDITIONAL DETAILS...Monday will be hotter than Sunday.
  Offshore winds will suppress the sea breeze and bring warm to
  hot conditions closer than usual to the coast. In addition,
  offshore winds may push wildfire smoke from the August and Red
  Salmon fires back into the area. Limited relief near the coast
  with sharp temperature changes only a few miles inland.
  Bayshore locations, especially those north of the San Mateo
  Bridge, will be the most impacted by the offshore flow during
  this heat event. Onshore flow is expected to begin returning
  to the coast later Monday but may not arrive until peak
  heating has already occurred.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

$$

For more information from the National Weather Service visit
http://weather.gov/mtr




Red Flag Warning

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Francisco Bay Area
559 AM PDT Sun Sep 27 2020

CAZ510-280500-
/O.CON.KMTR.FW.W.0005.000000T0000Z-200929T0400Z/
East Bay Interior Valleys-
559 AM PDT Sun Sep 27 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM PDT MONDAY FOR
OFFSHORE WIND AND LOW HUMIDITY FOR FIRE WEATHER ZONE 510...

* WIND...North to northeast winds 10 to 20 mph with with local
  gusts of 30 will continue into Sunday Night.

* HUMIDITY...Humidity values from 10-25% Sunday and Monday with
  very little recovery Sunday Night.

* HIGHEST THREAT...The I-680 corridor and I-580 east of the
  Altamont as well as the Highway 4 corridor.

* IMPACTS....Any fires that develop will spread rapidly in the
  hot, dry and breezy weather.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now...or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$



U.S. Dept. of Commerce
NOAA National Weather Service
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Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
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