Area Forecast Discussion
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
713 FXUS66 KPDT 180930 AFDPDT Area Forecast Discussion National Weather Service Pendleton OR 230 AM PDT Wed Sep 18 2024 .SHORT TERM...Today through Friday...As an upper-level low cuts off and dives down into the southwestern CONUS, the PacNW will be left under a drier airmass as weak N to NW flow prevails over the forecast area. With this drier air overhead, expect clearing skies and temperatures around seasonable averages for the majority of the CWA. Once the flow aloft develops a more defined NW pattern Thursday into Friday, expect gusty conditions through the Cascade Gaps and a slight chance for showers across primarily the WA Cascade crests. Not expecting gusts as strong as what we saw on Tuesday, but the Gorge and Kittitas Valley are forecast to receive gusts approaching 30 mph both Thursday and Friday. These winds may spread a bit into the Basin, but gusty conditions are largely expected to be secluded to the Gaps. Otherwise, the remainder of the work week looks to be benign amidst an otherwise active synoptic pattern. Could see some chilly overnight lows across central and south central Oregon over the next few nights as this dry air mass causes RHs to drop, allowing for efficient nighttime cooling, but outside of the elevated valleys like the Bear Valley, am currently not anticipating lows to drop below freezing. Evans/74 .LONG TERM...Saturday through Wednesday...Ensemble runs show good agreement through the period dominated by a westerly flow. This westerly flow will see a weak shortwave trough clipping the region on Sunday as it passes through western Canada. It will bring a chance of some showers to the Cascades and the eastern mountains but otherwise it looks to remain dry across the rest of the forecast area. This will be followed by a flat ridge pattern over the region through the first of the week as an upper level trough forms and deepens over the Gulf of Alaska. The trough will eventually push its way into western Canada and the Pacific Northwest midweek bringing a chance of showers back to the forecast area on Wednesday. Overall temperatures look to remain near seasonable norms with some minor fluctuations associated with the expected trough to ridge to trough pattern. && .AVIATION...12Z TAFs...VFR conditions expected over the next 24 hours with cloud cover continuing to decrease and becoming mostly clear. Winds will generally be less than 10 knots except for some 10-15kt winds at DLS through the afternoon and evening period. && .PRELIMINARY POINT TEMPS/POPS... PDT 74 46 77 47 / 0 0 0 0 ALW 76 51 79 51 / 0 0 0 0 PSC 79 53 81 52 / 0 0 0 0 YKM 80 47 81 45 / 0 0 0 0 HRI 79 51 81 51 / 0 0 0 0 ELN 76 49 77 49 / 0 0 0 0 RDM 72 41 78 39 / 0 0 0 0 LGD 72 45 78 44 / 0 0 0 0 GCD 72 43 78 42 / 0 0 0 0 DLS 78 52 80 52 / 0 0 0 0 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && $$ SHORT TERM...74 LONG TERM....91 AVIATION...91