National Weather Service United States Department of Commerce

High Pressure and Near Seasonal Temperatures Persist This Week

A warming trend continues under building high pressure. Plus, winter weather preparedness tips! Read More >

COZ205-181200-
Colorado River Headwaters-
153 PM MDT Tue Oct 17 2017

.DISCUSSION...High pressure across the Desert Southwest will 
keep dry and clear conditions ongoing through Wednesday. Light 
winds at the surface and aloft are expected with shallow mixing. A 
shortwave trough will move through Colorado and Utah Thursday, 
increasing southwesterly gradient winds and the chance for showers. 
Rain chances increase late Friday ahead of a cold front. 




...GUSTY ERRATIC WINDS CAN BE EXPECTED NEAR ANY SHOWERS
OR THUNDERSTORMS...
...THE SMOKE DATA IS CALCULATED FROM AN AVERAGE AT 6000 FEET MSL...

.Tonight...
Sky/weather.........Mostly clear (10-20%). 
Min temperature.....26-36 F. 
Max humidity........39-49%. 
20-foot winds.......Upslope/upvalley 4 to 8 mph becoming 
                    downslope/downvalley 3 to 6 mph by sunset.
CWR.................0 percent. 
LAL.................1.
Haines Index........5 moderate. 
15K Ft MSL Winds....West 15 to 20 mph, increasing to 20 to 30 mph 
                    after midnight. 
Mixing Height.......2500 ft AGL. 
Transport Winds.....Southwest 5 to 10 mph. 
Smoke dispersal.....Poor. 

.WEDNESDAY...
Sky/weather.........Mostly sunny (20-30%). 
Max temperature.....59-69 F. 
Min humidity........10-15%. 
20-foot winds.......Downslope/downvalley 3 to 6 mph becoming 
                    upslope/upvalley 4 to 8 mph by 1100.
CWR.................0 percent. 
LAL.................1.
Haines Index........5 moderate. 
15K Ft MSL Winds....Northwest 20 to 25 mph, becoming west 5 to 10 
                    mph in the afternoon. 
Mixing Height.......3500 ft AGL until 1200, then 6000 ft AGL. 
Transport Winds.....Southwest 5 mph. 
Smoke dispersal.....Poor until 1200, then fair. 

.WEDNESDAY NIGHT...
Sky/weather.........Mostly clear (20-30%). 
Min temperature.....27-37 F. 
Max humidity........49-59%. 
20-foot winds.......Upslope/upvalley 4 to 8 mph becoming 
                    downslope/downvalley 3 to 6 mph by sunset.
CWR.................0 percent. 
LAL.................1.
Haines Index........5 moderate. 
15K Ft MSL Winds....Southwest 10 to 15 mph, increasing to 15 to 20 
                    mph after midnight. 
Mixing Height.......2500 ft AGL. 
Transport Winds.....South 5 mph. 
Smoke dispersal.....Poor. 

.THURSDAY...
Sky/weather.........Partly cloudy (40-50%). 
Max temperature.....59-69 F. 
Min humidity........19-29%. 
20-foot winds.......Downslope/downvalley 3 to 6 mph becoming 
                    upslope/upvalley 4 to 8 mph by 1100.
CWR.................0 percent. 
LAL.................1.
Haines Index........5 moderate. 
15K Ft MSL Winds....Southwest 20 to 30 mph. 
Mixing Height.......3000 ft AGL until 1100, then 7500 ft AGL. 
Transport Winds.....South 5 to 10 mph until 1200, then southwest 15 
                    to 20 mph. 
Smoke dispersal.....Poor until 0900. Good after 1200. 

.FORECAST FOR DAY 3 THROUGH 7...
.FRIDAY...Partly cloudy. Lows 29-39. Highs 55-65. Southwest winds
10 to 20 mph with gusts up to 30 mph. 
.SATURDAY...Cooler. Partly cloudy. Scattered showers. Lows 23-33.
Highs 44-54. West winds 10 to 20 mph with gusts up to 25 mph. 
.SUNDAY...Mostly clear. Lows 22-32. Highs 48-58. Winds less than
15 mph. 
.MONDAY...Mostly clear. Lows 27-37. Highs 52-62. 
.TUESDAY...Mostly clear. Lows 26-36. Highs 52-62. 

$$