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wwus86 kmtr 201254

urgent - fire weather message
national weather service san francisco ca
454 am pst wed nov 20 2019

...red flag warning for the north bay mountains and east bay
hills through thursday morning...

.offshore winds will continue over the higher elevations of the 
north bay and east bay early this morning through wednesday 
night. these offshore winds in combination with low relative 
humidity values will lead to critical fire weather conditions. 
additionally, poor overnight relative humidity recoveries are 
expected wednesday night and into thursday morning as a result of 
the continued offshore winds.

north bay mountains-east bay hills and the diablo range-
454 am pst wed nov 20 2019

...red flag warning remains in effect until 7 am pst thursday for
dry offshore winds for fire weather zones 507 and 511...

* affected area...north bay mountains above 1000 feet, east bay 
  hills above 1000 ft, and the diablo range. fire weather zones 
  507 and 511. 

* wind...north to northeast winds 20 to 30 mph with gusts 35 to 
  45 mph. local gusts at isolated peaks and ridgetops may 
  approach and possibly exceed 60 mph.

* humidity...wednesday afternoon relative humidity values
  dropping to 15 to 30 percent. poor recoveries are forecast on 
  wednesday night with relative humidity values in the 30 to 45 
  percent range with localized values down to 25 percent. 

* impacts...any fires that develop will likely spread rapidly. 
  outdoor burning is not recommended.

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...dry fuels...and warm
temperatures can contribute to extreme fire behavior.



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