textproduct: Pendleton

AVIATION...18Z TAFs

VFR conditions will prevail for all sites with lingering haze over KPDT. Light rain may develop for KDLS/KYKM this afternoon into early evening hours (<30% probability). The next system will bring more rainfall overnight through Thursday morning hours, which could gradually lower CIGs and/or VSBYs to MVFR conditions. Light freezing rain may be potential for KYKM early Thursday morning (30% prob). Guidance have hinted light snow for Thursday morning as well for KYKM, but confidence is low (<20%) at this time to mention it in the TAF. Winds will remain less than 12kts. Feaster/97

DISCUSSION

The leading line of precipitation will exit the eastern mountains by around 5-6 am leaving only lingering showers over the Northern Blues through mid afternoon. Precipitation Tonight and early Thursday should be more relegated to western areas, the Kittitas valley and the upper slopes of the WA Cascade Crest. This is being forced by the lingering Atmospheric River influence which indicates a 150-200kg/ms IVT signal into the Eastern Columbia River Gorge region overnight. Snow should be relegated to WA522 and WA523 with rain or possibly freezing rain potential (fairly low, around 25-30% chances) across the lower slopes of the WA Cascades and in the Kittitas Valley/Ellensburg area. Most other areas of the lowlands have temperatures overnight remaining above freezing based on the NBM expected values, resulting in rain at the surface.

Temperatures moderate slightly for the rest of the week and through the weekend, plateauing in the upper 40s to around 50 degrees. Warmer mid 50s might be found in central Oregon Saturday afternoon, and lows though the period maintain the low to mid 30s across the Columbia basin.

PRELIMINARY POINT TEMPS/POPS

PDT 48 34 50 37 / 10 20 40 20 ALW 47 37 50 39 / 40 20 50 20 PSC 46 33 47 35 / 10 30 40 30 YKM 41 32 42 35 / 20 50 60 30 HRI 47 33 49 35 / 10 30 30 20 ELN 39 31 39 33 / 30 50 70 50 RDM 47 31 51 34 / 10 30 20 0 LGD 46 31 44 35 / 40 20 50 10 GCD 45 31 46 34 / 10 20 50 10 DLS 45 37 47 38 / 50 80 80 30

PDT WATCHES/WARNINGS/ADVISORIES

OR...None. WA...None.