246 
FNUS76 KPDT 212253
FWSPDT

Spot Forecast for S-503 Update...ORWSA
National Weather Service Pendleton OR
353 PM PDT Mon Jun 21 2021

Forecast is based on forecast start time of 1600 PDT on June 21. 
***Thunderstorms imply gusty and erratic winds***
***Winds are 20 foot 10-minute averages***
***CWR-Chance of wetting rain 0.10 or greater***

If you have questions or concerns with this forecast, please
contact our office at (541) 276-8134.

.DISCUSSION...High pressure will dominate the areas weather
with dry conditions and warm temperatures for the remainder 
of today. Meanwhile a low pressure system over the eastern 
Pacific may usher some moisture into portions of Central Oregon 
that could create cumulus buildups beginning this evening. On 
Tuesday the moisture drifts further north and the cumulus 
buildups may become more numerous Tuesday afternoon. The winds 
may increase somewhat from the west Tuesday afternoon and 
temperatures are not expected to be as warm. 

.REST OF TODAY...

Sky/weather.........Sunny. Areas of smoke. 
CWR.................0 percent. 
LAL.................1. 
Max temperature.....93-96. 
Min humidity........18-21 percent. 
Wind (20 ft)........North to northwest winds up to 6 mph. 
Ridgetop wind.......North to northwest winds 4 to 8 mph. 
Mixing height.......6300 ft AGL. 
Transport winds.....North around 9 mph. 
Haines Index........5 or moderate potential for large plume 
                    dominated fire growth. 

.TONIGHT...

Sky/weather.........Partly cloudy. Areas of smoke. 
CWR.................0 percent. 
LAL.................1. 
Min temperature.....63-66. 
Max humidity........77-80 percent. 
Wind (20 ft)........West to northwest winds 4 to 8 mph. 
Ridgetop wind.......West to northwest winds 5 to 9 mph. 
Mixing height.......1100 ft AGL in the evening then near surface. 
Transport winds.....West around 9 mph. 
Haines Index........4 or low potential for large plume dominated 
                    fire growth. 

.TUESDAY...

Sky/weather.........Mostly cloudy. Patchy smoke in the morning. 
                    Afternoon cumulus buildups.
CWR.................0 percent. 
LAL.................1. 
Max temperature.....86-89. 
Min humidity........26-29 percent. 
Wind (20 ft)........West to southwest winds 4 to 8 mph...increasing
                    to 7 to 14 mph with gusts to 16 mph in 
                    the afternoon. 
Ridgetop wind.......West to southwest winds 5 to 10 mph...increasing
                    to 8 to 16 mph with gusts to 18 mph in the 
                    afternoon.  
Mixing height.......Near surface then 5500 ft AGL early in the 
                    morning. 
Transport winds.....West around 11 mph. 
Haines Index........5 or moderate potential for large plume 
                    dominated fire growth. 

$$
Forecaster...vp
Requested by...WS Dispatch
Type of request...WILDFIRE
.TAG 2114425.1/PDT
.DELDT 06/21/21
.FormatterVersion 1.0.26
.EMAIL gualberto.medina@ctwsbnr.org