textproduct: Pendleton

DISCUSSION

Satellite shows some low to mid level stratus, with not much to show for precipitation thanks to the transient ridge in the area. Dry and cool conditions will continue through the night with temperatures falling below freezing. Patchy freezing fog will develop overnight near Central Oregon, North Central Oregon, and parts of the Kittitas Valley.

Going through tonight, the ridge will push to the east and introduce a trough into the area that will continue to bring increased cloud cover in the region. As mentioned earlier, fog formation will develop in parts of Central Oregon and the Kittitas Valley, although coverage is not forecasted to be widespread. The trough is expected to exit the region by Wednesday that will bring another transient ridge into the area with dry/partly cloudy conditions through Thursday.

Ensemble guidance shows a trough moving through the Pacific and into the coast by Friday with a secondary low pressure pushing down the other low pressure system. Moisture looks not to be impressive with this system and noted a more down trend in QPF in the NBM runs today compared to yesterday. Although 27% of clusters still want to advertise heavy mountain snow across the Cascades, snow amounts seem a bit less confident due to the complexity of this setup. Current, NBM guidance shows up 6 inches through the weekend for parts of the Cascades and Northern Blues, with confidence levels of snow amounts still low (15 to 35 percent), although will re-assess as we get closer to the weekend.

AVIATION /00Z TAFS THROUGH 00Z THURSDAY/

Low stratus and mist has dissipated at DLS, leaving VFR conditions for all sites. Later tonight into Wednesday morning, confidence is low-medium (30-50 percent) in fog and/or low stratus developing at PDT/ALW/PSC and medium-high (60-80 percent) at BDN/RDM. Have advertised a SCT layer at PDT/PSC for now, but confidence was high enough at BDN/RDM/ALW to inject a BKN CIG.

Preliminary Point Temps/PoPs

PDT 29 42 29 48 / 0 0 0 0 ALW 31 43 31 47 / 0 0 0 0 PSC 29 48 30 48 / 0 0 0 0 YKM 29 49 29 46 / 0 0 0 0 HRI 29 46 29 48 / 0 0 0 0 ELN 28 44 28 45 / 0 0 0 0 RDM 23 43 23 51 / 0 0 0 0 LGD 26 49 27 50 / 0 0 0 0 GCD 27 48 28 50 / 0 10 0 0 DLS 34 50 32 50 / 0 0 0 0

PDT WATCHES/WARNINGS/ADVISORIES

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