Issued: Friday Jul 03, 2009
Predictive Service Areas Ytd Fri Sat Sun Mon Tue Wed Thu
Jul 02 Jul 03 Jul 04 Jul 05 Jul 06 Jul 07 Jul 08 Jul 09
NC01 - North Coast 3 3 3 2 2 2 2 2
NC02 - Mid Coast to Mendocino   3 3 3 2 2 2 2
NC03 - Bay Area 3 3 3 3 3 2 2 2
NC04 - Northwestern Mountains   3 3 3 3 2 2 2
NC05 - Sacramento Vly/Foothills 3 3 3 3 3 3 3 3
NC06 - Northeastern California   3 3 3 2 2 2 2
NC07 - Northern Sierra 3 3 3 3 3 2 2 2
NC08 - East Side 3 3 3 W 2 2 2 2
Weather Synopsis:  
Isolated showers and thunderstorms are possible near the OR border and from the Cascade-Sierra crest east today.  Thunderstorms will produce light rainfall, but dry lightning strikes will also occur.  A low pressure trough will deepen offshore today through the weekend and produce a gradual increasing SW flow over the North Ops area.  This will push any moisture off to the east, and no showers or thunderstorms are expected on Saturday.  Sunday will be a bit cooler with increasing S-SW winds as the low moves closer to the coast.  Late in the day there's a slight chance of a shower or thunderstorm in far NW CA as a disturbance passes to the NW.  The strongest winds (gusts to 32-38 mph) will combine with fairly low RH east of the crest late Sunday.  A strong low will be near/over the NW corner of the North Ops region through midweek and produce temperatures as much as 15-20 degrees below normal and a chance of showers or thunderstorms each day, with higher chances in the north.  Late in the week conditions will begin to slowly move back to seasonal normals.
Click on this link to see CANSAC 3-hrly surface wind and precipitation forecasts:
http://www.cefa.dri.edu/COFF/cansac_output.php
Fire Potential Discussion:                    
Isolated thunderstorms today may produce new ignitions mainly on mid and upper slopes in the northern and eastern mountains.  Fuels at these levels are drying out, but rapid fire growth is not likely.  Although the potential for significant fire development has increased, including the consideration of the amount of strikes and availability of resources, the threat today is not considered "High Risk".  On Sunday S-SW surface winds will become strong and gusty, especially in NC08, which will have relatively low RH, so a "High Risk" symbol is posted.  Any thunderstorm activity expected late Sunday in far NW CA is expected to be isolated.  From Monday through at least mid-week conditions throughout the North Ops region will be cool and humid so any gusty winds will not be cause for "High Risk".
Resources
Northern California Geographic Area Preparedness Level 2, MACS Mode 2.  Resource draw down is moderate.  Initial attack success is likely.
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NOTICE: Forecast for the following PSA's may be unavailable or unrepresentative of actual conditions due to missing observations from the stations listed below: 
 

MID COAST

Mendocino Pass

Soda Creek    

 

EAST SIDE

Barrel Springs

Juniper Springs

Stampede