914  
WWUS86 KSTO 242038  
RFWSTO  
 
URGENT - FIRE WEATHER MESSAGE  
NATIONAL WEATHER SERVICE SACRAMENTO CA  
138 PM PDT SUN SEP 24 2017  
 
...CRITICAL FIRE WEATHER CONDITIONS THROUGH EARLY TUESDAY  
MORNING...  
 
.GUSTY NORTHERLY OR OFFSHORE WINDS OVER THE NORTHERN AND WESTERN  
SACRAMENTO VALLEY AND ADJACENT FOOTHILLS WILL REDEVELOP THIS  
AFTERNOON AND EXPAND SOUTHEASTWARD LATE TODAY ACROSS PORTIONS OF  
THE SIERRA NEVADA THROUGH EARLY TUESDAY MORNING. THE COMBINATION  
OF OFFSHORE WINDS AND DRY AIRMASS ARE EXPECTED TO BRING CRITICAL  
FIRE WEATHER CONDITIONS.  
 
CAZ213-215>218-263-264-266-279-251200-  
/O.CON.KSTO.FW.W.0010.000000T0000Z-170926T1200Z/  
EASTERN PORTION OF SHASTA/TRINITY NF-  
NORTHERN SACRAMENTO VALLEY TO SOUTHERN TEHAMA COUNTY LINE BELOW  
1000 FT-  
CENTRAL SACRAMENTO VALLEY IN GLENN, COLUSA, YUBA, NORTHERN  
SUTTER, AND BUTTE COUNTY BELOW 1000 FT-  
SOUTHERN SACRAMENTO VALLEY IN YOLO-  
SACRAMENTO FAR WESTERN PLACER, SOUTHERN SUTTER AND SOLANO COUNTY  
BELOW 1000 FT-CARQUINEZ STRAIT AND DELTA-SOUTHEAST EDGE SHASTA-  
TRINITY NF AND WESTERN PORTIONS OF TEHAMA-GLENN UNIT-  
LAKE COUNTY PORTION OF LAKE-NAPA-SONOMA UNIT-  
NORTHERN SIERRA FOOTHILLS FROM 1000 TO 3000 FT. INCLUDES PORTIONS  
OF SHASTA-TRINITY AND BUTTE UNITS-EASTERN MENDOCINO NF-  
138 PM PDT SUN SEP 24 2017  
 
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 AM PDT TUESDAY FOR  
FIRE WEATHER ZONES 213, 215, 216, 217, 218, 263, 264, 266, AND  
279...  
 
* WIND...NORTHERLY WINDS 10 TO 20 MPH WITH GUSTS 25 TO 30 MPH  
THROUGH THE NORTHERN AND WESTERN PORTIONS OF THE SACRAMENTO  
VALLEY AND ADJACENT EXPOSED FOOTHILL RIDGES. STRONGEST  
FOOTHILL WINDS EXPECTED DURING OVERNIGHT HOURS.  
 
* HUMIDITY...DAYTIME HUMIDITY OF 10 TO 20 PERCENT WITH MINIMAL  
HUMIDITY RECOVERY OVERNIGHT.  
 
* 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, AND WARM TEMPERATURES CAN  
CONTRIBUTE TO EXTREME FIRE BEHAVIOR.  
 

 
 
INTERACT WITH US VIA SOCIAL MEDIA  
WWW.FACEBOOK.COM/NWS.SACRAMENTO  
WWW.TWITTER.COM/NWSSACRAMENTO  
 

 
 
CAZ220-221-267>269-251200-  
/O.CON.KSTO.FW.W.0010.170925T0000Z-170926T1200Z/  
SOUTHERN MOTHERLODE FROM 1000 TO 3000 FT. INCLUDES PORTIONS OF  
CALAVERAS-TUOLUMNE UNIT-STANISLAUS NF WEST OF THE SIERRA CREST-  
NORTHERN MOTHERLODE FROM 1000 TO 3000 FT. INCLUDES PORTIONS OF  
NEVADA-YUBA-PLACER-AMADOR AND ELDORADO UNITS-  
NORTHERN SIERRA INCLUDING LASSEN NP AND PLUMAS AND LASSEN NF/S  
WEST OF THE SIERRA CREST (WEST OF EVANS PEAK-GRIZZLY PEAK-  
BECKWORTH PEAK)-  
NORTHERN SIERRA INCLUDING THE TAHOE AND ELDORADO NF/S WEST OF THE  
SIERRA CREST-  
138 PM PDT SUN SEP 24 2017  
 
...RED FLAG WARNING REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO  
5 AM PDT TUESDAY FOR FIRE WEATHER ZONES 220, 221, 267, 268, AND  
269...  
 
* WIND...NORTHEAST WINDS 10 TO 20 MPH WITH GUSTS 20 TO 25 MPH  
OVER EXPOSED RIDGES AND STRONGER THROUGH ALIGNED CANYONS.  
STRONGEST WINDS EXPECTED DURING OVERNIGHT AND MORNING HOURS.  
 
* HUMIDITY...DAYTIME HUMIDITY OF 12 TO 25 PERCENT WITH THE MAIN  
CONCERN BEING MINIMAL HUMIDITY RECOVERY OVERNIGHT.  
 
* 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, AND WARM TEMPERATURES CAN  
CONTRIBUTE TO EXTREME FIRE BEHAVIOR.  
 

 
 
INTERACT WITH US VIA SOCIAL MEDIA  
WWW.FACEBOOK.COM/NWS.SACRAMENTO  
WWW.TWITTER.COM/NWSSACRAMENTO  
 

 
 
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