textproduct: Pendleton

KEY MESSAGES

1.Dry and warm through the weekend becoming hot Monday *Heat Advisories Issued*

2. Breezy to windy across the region through Wednesday

3. Isolated fire weather concerns today becoming widespread Tuesday *Fire Weather Watch Issued*

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).

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 condusive 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 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

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.