...RED FLAG WARNING IN EFFECT THROUGH 3 PM FRIDAY FOR MANY
INTERIOR PORTIONS OF SOUTHWEST CALIFORNIA DUE TO EXTREME HEAT AND
INSTABILITY ALONG WITH LOCALLY GUSTY WINDS AND LOW HUMIDITIES...

...RED FLAG WARNING IN EFFECT FROM FRIDAY 5 AM THROUGH 3 PM
ACROSS ALL OF SAN LUIS OBISPO COUNTY TO DO POTENTIAL FOR DRY
LIGHTNING...

.A very hot and unstable air mass combined with locally gusty
winds and low humidities will bring a significant risk of large
plume dominated fires with rapid spread and extreme fire
behavior. Additionally, tropical moisture streaming across our
area will bring a 15-25 percent chance of thunderstorms to the
region, with a moderate risk for frequent fire starts across San
Luis Obispo County due to dry lightning potential.

* TEMPERATURES...Highs 100 to 110 across the lower mountains,
adjacent foothills and the Cuyama Valley, and 85 to 95 across
higher mountains. Very deep mixing heights of 12,000 to 17,000
feet today, slightly lower on Friday.

* WINDS...Local west to north winds 15 to 25 mph with gusts up
to 35 mph at times, strongest across the I-5 and Highway 33
corridors. A slightly stronger northerly wind push is possible
late tonight into Friday morning, with gusts up to 40 mph
possible across the I-5 corridor and other favored interior
mountain passes.

* RELATIVE HUMIDITY...Minimum humidities 12 to 25 percent. Poor
recoveries overnight hours in the mountains and foothills with
humidities in the 15 to 30 percent range.

* IMPACTS...There is a significant risk of large plume dominated
fires with rapid fire spread and extreme fire behavior. There
is a history of large plume dominated fires this time of year
with similar weather and fuel conditions, including the
Bridge, Bobcat, and Station fires.

A Red Flag Warning means that critical fire weather conditions
will occur shortly. Use extreme caution with anything that can
spark a wildfire. Residents near wildland interfaces should be
prepared to evacuate if a wildfire breaks out. See
readyforwildfire.org and wildfirerisk.org for information.

* WHAT...Hot daytime conditions with high temperatures between 100
and 110 common. Warm overnight conditions will bring less relief
than usual.

* WHERE...Most mountains and valleys of Los Angeles, Ventura, and
Santa Barbara Counties.

* WHEN...Until 8 PM PDT Friday.

* IMPACTS...There is a high risk for dangerous heat illness,
especially for sensitive groups like the very young, the very old,
those without air conditioning, and those active outdoors.

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors. Do not leave young
children and pets in unattended vehicles. Limit strenuous activities
to early morning or evening hours. Take action when you see symptoms
of heat exhaustion.

* WHAT...Hot daytime conditions with high temperatures between 92 and
102 common. Warm overnight conditions will bring less relief than
usual.

* WHERE...Most coastal areas of Los Angeles, Ventura, and southern
Santa Barbara Counties

* WHEN...Until 8 PM PDT Friday.

* IMPACTS...There is a high risk for dangerous heat illness,
especially for sensitive groups like the very young, the very old,
those without air conditioning, and those active outdoors.

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors. Do not leave young
children and pets in unattended vehicles. Limit strenuous activities
to early morning or evening hours. Take action when you see symptoms
of heat exhaustion.

* WHAT...Hot daytime conditions with high temperatures between 90 and
100 common.

* WHERE...San Luis Obispo County Inland Central Coast, Santa Barbara
County Inland Central Coast, and Santa Ynez Valley.

* WHEN...Until 8 PM PDT Friday.

* IMPACTS...There is a high risk for dangerous heat illness for
sensitive groups like the very young, the very old, those without
air conditioning, and those active outdoors.

* ADDITIONAL DETAILS...This advisory has been extended to now end on
Friday. While temperatures will peak through Thursday, humidities
will rise on Friday largely mitigating any relief from the heat.

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors. Do not leave young
children and pets in unattended vehicles. Limit strenuous activities
to early morning or evening hours. Take action when you see symptoms
of heat exhaustion.