Kriedermanįor information about upcoming marine zone changes, go online to:
Visibilities will likely fluctuate between 4NM to less than 1NM at times this evening through Monday afternoon. However, the central waters will likely fall back under dense fog overnight, with the fog eroding from the northwest through the night, remaining in the inner waters through about 6 am. There is a small, 1 to 2 feet, southerly swell around 14-17 seconds reaching the waters through at least mid-week.Ī weather system to the north should restrict dense fog from forming overnight over the northern waters. Seas will remain around 5 ft, 9 sec dominated by a northwesterly swell generated off of Vancouver Island. High surface pressure offshore and thermally induced low pressure inland will continue the N-NW winds through most of the week. Bottom line, the weekend could feature anything from temps near seasonal norms to rising well into the 90s again depending on the evolution of the synoptic pattern which will hopefully come into better focus in the days ahead. Nudged closer to NBM 75th percentile guidance. This uncertainty is depicted by a rather large spread both in deterministic solutions and ensemble clusters of 500 mb height anomalies, which leads to a sizable range of outcomes for forecast temperatures by the end of next week.
#Florence oregon weather how to
After the upper trough moves east, models are showing the cutoff low moving back northeast to near its current position this weekend, as heigheights begin to build again as the upper ridge attempts to nudge back into the Pacific NW.įorecast confidence remains lower than normal from Friday into next weekend, mainly owing to continued model struggles on how to handle the evolution of the cutoff low as it lingers offshore and possibly approaches the coast again late in the extended period. Most ensemble members at KAST were showing at least a trace or more of precipitation so increased Probability of Precipitation above the NBM. A weak surface front may bring some light rain or drizzle to the far northwest coast while cloud cover increases and 850 mb temps fall to around 12-14 C, suggesting highs in the upper 70s to lower 80s Thursday afternoon. Thursday is expected to be the coolest day of the week as a shortwave trough drops out of the SE Gulf of Alaska and over Washington. THURSDAY THROUGH MONDAY.Decent agreement among the deterministic models and their ensembles late this week, but uncertainty returns for the weekend forecast. Convection on Wednesday is expected to remain south and east of our region. Thunderstorm potential will remain low and mainly near the central Oregon Cascade crest for this evening and Tuesday afternoon. Increased onshore flow in the lower levels, especially on Wednesday, will bring breezy northwest winds through the coastal gaps and through the Columbia Gorge. Temperatures will remain in the 60s to lower 70s. The coast continues to remain under the influence of the marine airmass, but stratus has slowly been lifting and chances are increasing that skies may clear on Tuesday afternoon. The more westerly flow should also allow for the haze aloft from the northern CA wildfire smoke to clear.
Expect highs topping out in the upper 80s to lower 90s in the interior valleys both Tuesday and Wednesday afternoon. This will continue the gradual cooling trend inland although temperatures will likely remain above normals for early August through Wednesday. Southwesterly flow aloft, though, will turn more westerly tonight as the upper shortwave moves across WA and British Columbia and the cutoff low retrogrades southwest and farther offshore. Also of note is the quasi-stationary cutoff low which continues to spin off the northern California coast which is pulling up some midlevel moisture across the region. SHORT TERM.THROUGH WEDNESDAY NIGHT.Water vapor satellite imagery this afternoon shows the upper level pattern featuring a broad shortwave trough pushing east into western Washington which is helping to nudge the upper ridge farther southeast and allowing some slightly cooler temperatures aloft to move in. Thursday will be the coolest day before another potential warm up into the weekend. Thunderstorms remain possible over the central Cascades through Tuesday afternoon. UPDATED National Weather Service Portland ORĬooling trend continues this week, although temperatures will likely remain above seasonal norms through Wednesday.
0 kommentar(er)
