FXUS66 KMFR 080129 AAA AFDMFR Area Forecast Discussion National Weather Service Medford OR 639 PM PDT Sat Sep 7 2024 Updated AVIATION Section .DISCUSSION...Satellite shows sunshine across areas east of the Cascades with cumulus moving northward in Siskiyou County and from the Cascades west. There is also marine stratus that is reaching into parts of Coos County. The HRRR smoke model is taking out the smoke in Jackson County sooner than anticipated for the evening, so added this to more of the area this afternoon. Radar shows that the showers in northeastern Lake County have moved farther north. A 15% probability of thunderstorms will be present with gusty outflow winds possible in the strongest storms with expected DCAPEs near 1,000 J/kg this afternoon and evening. Temperatures will still be overall 5-10 degrees warmer than normal through the rest of the weekend and Monday. After, a trough begins to reach the Pacific Northwest and near normal temperatures will return. This means by Tuesday afternoon 80s are in the forecast, and it will drop from there with 70s possible for highs west of the Cascades and 60s east Wednesday afternoon. The troughing will bring the next rain chance to the area later Tuesday night into Wednesday starting near the coast. Although the latest model runs are in better agreement that there will be rain Wednesday, there still are still unknowns on timing and amounts. The probability to see 0.25" of rain between 5 AM Wednesday- 5 AM Thursday has increased west of the Cascades to 40-60%. The Euro is bringing the system in earlier and is forecasting for the low to keep PoP chances through Thursday whereas the GFS finishes sooner. For now, have shown a drying trend through the day Thursday with the last spots in Douglas and Klamath counties to become dry. For thunderstorms, Tuesday night's computed CAPEs are nearing 150-300 J/kg near the Coos County coast, and with the west to east movement of the rain, added a probability of thunder ~10% there. Computed CAPEs also show 250-500 J/kg Wednesday afternoon east of the Cascades, so have added a 5-15% probability of thunder for that area. -Hermansen && .AVIATION...08/00Z TAFS...Along the coast and over the marine waters, stratus and fog will result in continued IFR/LIFR ceilings for all areas, including North Bend for most of the TAF period. MVFR/IFR conditions are expected to return to the coastal valleys tonight as well. Conditions should improve a bit to MVFR along the coast or even break up to VFR Sunday afternoon, but it should be short-lived as onshore flow will bring stratus back onshore quickly around sunset. Elsewhere, VFR conditions will continue through the TAF period. Stratus will make a run at Roseburg around daybreak Sunday. At this point, it's a 50/50 chance ceilings go BKN at 1500' around 13Z and last for a few hours, but for now will just have it as SCT, since we think it will stop short. We'll monitor how it progresses overnight. Numerous fires are burning in the area. We don't think they'll bring reduced visibility to the terminals, but MVFR visibilities are possible in smoke in the immediate vicinity of the fires. -Spilde && .MARINE...Updated 200 PM Saturday, September 7, 2024... Improved conditions are expected this evening and tonight, but north winds and steep wind-driven seas will return Sunday morning south of Cape Blanco, then across most of the southern Oregon coastal waters Monday. Conditions improve Tuesday night into Wednesday as weak low pressure moves into the region. North winds are then expected to return late in the week. -BPN && .FIRE WEATHER...Issued 200 PM Saturday, September 7, 2024...Hot, dry, and unstable conditions will continue into this weekend. Isolated to scattered thunderstorms remain a concern for today. Additionally, gusty winds and low humidities may result in brief or local critical conditions for areas in the Scott and Shasta Valleys and east of the Cascades. Current models show the upper level disturbance along southwest Oregon coast today, gradually moving inland tonight and east on Sunday. This is allowing for isolated to scattered showers and thunderstorms to develop over eastern portions of the area, including Lake and northern Klamath Counties. This is also a low (15%) chance for storms into eastern Douglas County this afternoon/evening. Storms are expect to be mainly isolated, except for a potential for scattered storms in northern Klamath and Lake counties. Thunderstorms may have little rain with them and gusty outflows up to 40 to 45 mph are possible nears storms. Gusty south to southwest winds and dry humidities are also expected this afternoon and early evening, for the Scott and Shasta Valleys as well as for some areas east of the Cascades into southeastern fire weather zone 624, southern 625 and eastern 285. Conditions may near critical RH/wind levels in these areas. A headline is in the forecast for these potential conditions. Tonight, winds lower but expect areas of moderate recoveries over the ridges, mainly in southeast 625, southern 625 and northern California zones (280-285). Sunday and Monday, temperatures are expected to trend less warm as another upper trough approaches the region. However, humidities will remain dry. On Monday, there is also a potential for some breezy afternoon conditions in Modoc and Lake counties. The trough and associated front will then move through Tuesday and Wednesday, resulting in chances for light rain showers and isolated thunderstorms, cooler temperatures, and a potential for breezy to gusty winds. Confidence is low on the strength of this trough and how much rain will arrive, but there is a chance (20-40%) for wetting rainfall (0.25"+) on Wednesday for areas from the Cascades west. The thunderstorm potential is current low (10-20%) and is focused on Wednesday for areas east of the Cascades, mainly in Lake and Modoc counties. -CC && .MFR WATCHES/WARNINGS/ADVISORIES... OR...Small Craft Advisory from 2 AM Monday to 11 AM PDT Tuesday for ORZ021. Red Flag Warning until 9 PM PDT this evening for ORZ624-625. CA...None. PACIFIC COASTAL WATERS...Small Craft Advisory from 2 AM Monday to 11 AM PDT Tuesday for PZZ350-370. Small Craft Advisory from 11 AM Sunday to 11 AM PDT Tuesday for PZZ356-376. && $$