Interactive NWS Alert
Radar valid at 500 pm PDT, Aug 24th 2020
Elevated moisture and instability from former Hurricane Genevieve
will will move over the region this weekend through early next
week and bring the threat of elevated thunderstorms across much of
Northern California. A low pressure system off the coast may
enhance and strengthen these thunderstorms allowing some to
develop frequent lighting strikes and gusty erratic outflow winds.
These erratic gusty outflow winds can lead to potentially
dangerous and unpredictable fire behavior on existing wildfires
while additional lightning strikes may result in new wildfire
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
San Francisco Bay Shoreline-San Francisco Peninsula Coast-
East Bay Interior Valleys-East Bay Hills and the Diablo Range-
Santa Cruz Mountains-Santa Clara Valley Including San Jose-
Southern Salinas Valley/Arroyo Seco and Lake San Antonio-
Santa Lucia Mountains and Los Padres National Forest-
Mountains Of San Benito County And Interior Monterey County
Including Pinnacles National Park-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
1108 AM PDT Sat Aug 22 2020
...RED FLAG WARNING IN EFFECT FROM 5 AM SUNDAY TO 5 PM PDT MONDAY
FOR DRY LIGHTNING AND GUSTY ERRATIC OUTFLOW WINDS OVER EXISTING
WILDFIRES FOR FIRE WEATHER ZONES 006...505...506...
529 AND 530...
The National Weather Service in San Francisco has issued a Red
Flag Warning...which is in effect from 5 AM Sunday to 5 PM PDT
Monday. The Fire Weather Watch is longer in effect.
* WIND...Prevailing winds will be southwest, light in the morning
and breezy to locally gusty in the afternoon and evenings.
However, erratic gusty outflow winds of 30 to 65 mph may
accompany stronger thunderstorms.
* THUNDERSTORMS...The strongest thunderstorms are anticipated to
develop Sunday evening through Monday morning. Additional
isolated to scattered dry thunderstorms are forecast to develop
over land from early Sunday to late Monday. Weaker isolated
storms are possible off the coast as early as Saturday. Dry
thunderstorms may become wet as the event progresses.
* IMPACTS...Lightning will likely spark new fires across the
region, including remote areas. Wildfires in remote regions may
not become apparent until warmer and drier conditions allow them
to grow. Erratic gusty outflow winds may result in dangerous and
unpredictable fire behavior. Please report potential fires to
local CALFIRE or SHERIFF offices.
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.
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