Marine Weather and Tide Forecast for Seneca, OR

DISCUSSION
Heat, wind and fire weather are the primary sensible weather and risks going foreword over the next several days.
An upper level ridge is creating a relatively stable subsident nearly cloud free environment across the region Today with minimal mixing in the boundary layer resulting in lack of stronger wind gusts. LAMP guidance shows limited opportunity for gusts above 20 knots this afternoon, more occasional than frequent in the Columbia Basin as temperatures are forecast to rise higher over the low 90s from Hermiston to Walla Walla and Yakima, and the upper 80s in central Oregon.

Heat advisories are already in place for several public zones Monday afternoon for highs reaching into the 90s from central Oregon, the Eastern Columbia River Gorge and the Yakima/Kittitas valleys. These areas are reaching slightly in excess of level 2 on the HeatRisk scales, affecting anyone without cooling or hydration as well as some health systems and industries.
Weakening of the subsidence and more turbulent boundary layer with increased winds on Tuesday will bring relief to the HeatRisk.

Dry conditions are expected to persist for the entire 7 days going forward with another ramp up to hotter 90s peaking around Friday, when Heat Risk climbs back to a widespread Level 2 (orange).

AVIATION /06Z TAFS THROUGH 06Z TUESDAY/
VFR conditions prevail with light and variable winds, with the exception of DLS developing 15-20 knot gusts by tomorrow afternoon. Smoke by nearby wildfires is present in PDT but it's dispersed enough to keep us above 6SM. DLS is facing some haze issues through the next several hours. Observations flip between 5 and 6 SM. Kept the TAF's at 6SM, but brief 5SM observations is possible throughout the rest of the night as haze prevails.


Preliminary Point Temps/PoPs
PDT 87 53 92 61 / 0 0 0 0 ALW 87 58 92 65 / 0 0 0 0 PSC 91 57 97 63 / 0 0 0 0 YKM 91 61 99 63 / 0 0 0 0 HRI 90 56 95 64 / 0 0 0 0 ELN 87 59 94 63 / 0 0 0 0 RDM 86 49 91 55 / 0 0 0 0 LGD 84 49 89 54 / 0 0 0 0 GCD 86 47 91 52 / 0 0 0 0 DLS 93 64 99 69 / 0 0 0 0

FIRE WEATHER
Thermal trough is in place over the next couple of days which will bring additional drying to the fuels. This trough will be kicked out on Tuesday bringing much more breezy to windy conditions across the entire area. Combined probabilities of wind gusts to 20 mph with relative humidity falling below 25% become increasingly likely by Tuesday afternoon across the Columbia Basin where fuels, especially grasses are conducive to spread and are in the 30 to 85% chances of occurrence. Fire Weather Watches for Wind and Low RH will be issued for the Columbia Basin zones WA691/OR691 Tuesday morning through Tuesday Evening.

Preliminary Point Temps/PoPs
PDT 53 92 61 90 / 0 0 0 0 ALW 58 92 66 91 / 0 0 0 0 PSC 57 96 64 95 / 0 0 0 0 YKM 61 99 63 92 / 0 0 0 0 HRI 56 95 65 92 / 0 0 0 0 ELN 59 95 63 82 / 0 0 0 0 RDM 49 91 55 90 / 0 0 0 0 LGD 49 88 54 88 / 0 0 0 0 GCD 47 90 52 92 / 0 0 0 0 DLS 64 99 69 87 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES
WA...Heat Advisory from 10 AM to 10 PM PDT Monday for WAZ024-026- 027.
Fire Weather Watch from Tuesday morning through Tuesday evening for WAZ691.
OR...Heat Advisory from 10 AM to 10 PM PDT Monday for ORZ041-511.
Fire Weather Watch from Tuesday morning through Tuesday evening for ORZ691.