Watches, Warnings, and Advisories

Current Watches, Warnings and Advisories for East Bay Hills and the Diablo Range (CAZ511) California Issued by the National Weather Service


Red Flag Warning Red Flag Warning - East Bay Hills and the Diablo Range (California)

Updated:Sun, 22-Sep-2019 2:02pm PDT
Effective:Mon, 23-Sep-2019 9:00pm PDT
Expires:Wed, 25-Sep-2019 5:00am PDT

Areas affected: East Bay Hills and the Diablo Range; North Bay Mountains
Instructions: 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.

Message summary: flag warning in effect for the north bay mountains, east bay hills, and diablo range monday night through early wednesday morning...
.building high pressure will result in gusty offshore winds developing late monday which would bring critical fire weather conditions over the north and east bay mountains/hills from monday night to early wednesday morning. Additionally, hot afternoon temperatures on tuesday and low humidity values in the teens will contribute to increased fire danger. flag warning in effect from 9 pm monday to 5 am pdt wednesday for gusty winds and low relative humidity for fire weather zones 507 and 511...
The national weather service in san francisco has issued a red flag warning, which is in effect from 9 pm monday to 5 am pdt wednesday. The fire weather watch is no longer in effect.
* affected area...the north bay mountains, east bay hills and diablo range above 1000 feet. Fire weather zones 507 and 511.
* wind...north to northeast winds 10 to 25 mph with gusts 30 to 35 mph. Locally higher gusts to 40 mph in the north bay mountains possible, particularly in sonoma and napa counties.
* humidity...widespread minimum daytime humidity values in the teens to low 20s. Overnight recoveries of 30 to 50 percent.
* highest threat...north bay mountains, particularly the peaks and ridges in napa county.
* impacts...any fires that develop will have the potential to spread rapidly.
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Source: NWS Watches, Warnings or Advisories for zone CAZ511

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