612  
FXUS65 KFGZ 211147  
AFDFGZ  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE FLAGSTAFF AZ  
445 AM MST THU SEP 21 2017  
   
SYNOPSIS
 
EXPECT A COOLING TREND WITH WINDY CONDITIONS THROUGH  
FRIDAY. COOL CONDITIONS WILL PERSIST OVER THE WEEKEND, ALTHOUGH  
NOT AS WINDY. EXPECT FREEZING TEMPERATURES FOR MUCH OF THE HIGH  
COUNTRY SATURDAY AND SUNDAY MORNINGS.  
 

 
   
DISCUSSION
 
A DEEP, EARLY SEASON TROUGH WILL ENTER THE NORTHERN  
GREAT BASIN TODAY. THIS TROUGH WILL SLOWLY DROP SOUTH OVER THE NEXT  
FEW DAYS, CLOSING OFF FOR AWHILE OVER SOUTHERN UTAH SATURDAY AND  
SUNDAY, BEFORE MOVING EAST MONDAY. A LONGER WAVE TROUGH WILL REMAIN  
OVER THE WEST THROUGH MUCH OF NEXT WEEK.  
 
A COLD FRONT ASSOCIATED WITH THIS TROUGH WILL MOVE ACROSS NORTHERN  
ARIZONA ON FRIDAY. WINDS AHEAD OF THIS FRONT WILL PEAK TODAY AND A  
WIND ADVISORY IS OUT FOR MUCH OF THE AREA. WINDS WILL CONTINUE TO BE  
GUSTY ON FRIDAY, BUT WILL DECREASE FROM WEST TO EAST THROUGH THE DAY  
AS COLDER AIR FILTERS INTO THE STATE. MOISTURE IS VERY LIMITED WITH  
THIS TROUGH, A FEW LIGHT SHOWERS MAY DEVELOP ALONG THE FRONT FRIDAY  
AND OUT AGAIN EAST SATURDAY, MEASURABLE RAINFALL WILL BE DIFFICULT  
TO FIND.  
 
TEMPERATURES WILL FALL TO 10-15 DEGREES BELOW NORMAL FRIDAY AND INTO  
THE WEEKEND. MORE IMPORTANTLY, LOW TEMPERATURES SATURDAY AND SUNDAY  
MORNING WILL DROP BELOW FREEZING IN MANY AREAS OF THE HIGH COUNTRY.  
 
SLOWLY MODERATING CONDITONS ARE EXPECTED NEXT WEEK. A CHANCE OF  
SHOWERS MAY DEVELOP LATER NEXT WEEK AS ANOTHER LOW DROPS INTO THE  
TROUGH POSITION. THIS SOLUTION IS NOT SUPPORTED BY ALL THE MODELS,  
SO WE WILL HOLD OFF ON INTRODUCING POPS AT THIS TIME.  
 

 
   
AVIATION...FOR THE 12Z PACKAGE
 
EXPECT VFR CONDITIONS FOR THE  
NEXT 24 HOURS. BREEZY WINDS WILL CONTINUE THIS MORNING, WITH GUSTS  
TO 35 KTS POSSIBLE DOWNWIND OF HIGHER TERRAIN FEATURES. INCREASING  
SOUTH TO SOUTHWEST WINDS ARE FORECAST AFTER 15Z, BECOMING 20-30 KTS  
WITH GUSTS FROM 30-40 KTS. WINDS WILL DECREASE AFTER 03Z, BUT WILL  
LIKELY REMAIN ELEVATED THROUGH THE OVERNIGHT HOURS. AVIATION  
DISCUSSION NOT UPDATED FOR TAF AMENDMENTS.  
 

 
   
FIRE WEATHER
 
STRONG SOUTHWEST WINDS WILL DEVELOP ACROSS NORTHERN  
ARIZONA TODAY. ON FRIDAY, A MAINLY DRY, COLD FRONT WILL MOVE ACROSS  
THE AREA CAUSING CONTINUED BREEZY CONDITIONS AND JUST A SLIGHT  
CHANCE OF SHOWERS AND THUNDERSTORMS.  
 
SATURDAY THROUGH MONDAY...A SLIGHT CHANCE FOR SHOWERS AND  
THUNDERSTORMS CONTINUES OVER THE WEEKEND, MAINLY IN THE EASTERN  
ZONES. OTHERWISE, LOOK FOR LIGHTER WINDS AND WELL BELOW NORMAL  
TEMPERATURES.  
 

 
   
FGZ WATCHES/WARNINGS/ADVISORIES
 
 
WIND ADVISORY FROM 10AM TO 8PM MST TODAY FOR AZZ004>017-039-040.  
 

 
 

 
 
PUBLIC...PETERSON  
AVIATION...RICKEY  
FIRE WEATHER...RICKEY  
 
FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT  
WEATHER.GOV/FLAGSTAFF  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab AZ Page Main Text Page