![]() Most likely we’ll see gusts 55-65 mph along the beaches and 30-40 in the valleys. This shows accumulated gusts (highest gust) from now through 5pm Sunday. The ECMWF model shows this well, gusts over 100 mph over the open ocean, but under 70 mph along the Oregon coastline. Yet the strong wind field remains offshore through the event. This is all interesting stuff of course, but what’s the effect along the coastline and interior? A gusty east wind Sunday morning turns breezy from the south Sunday afternoon and Monday. Plus you see the lowest pressure right up against our coastline (the past 70 years) was that 960mb during the Columbus Day Storm. He tweeted “the minimum central pressure of 944 millibars from next storm off Pacific Northwest coast will likely be the deepest/most intense in this area of ocean at 45°N and 135°W at least since 1950” The graphic he tweeted shows that boxed area. Ryan Maue, a meteorologist with checked lowest surface pressure in the 1950-2021 record. ![]() For comparison, the Columbus Day Storm was “only” around 960 mb, but less than 50 miles off the coastline! Tracks of the last three major regional windstorms…all well inside 130W. That 943 millibar value will probably be an all-time record deep low pressure so close to the region. You can see the track of both lows, notice this 2nd one will be a bit closer All are forecasting a surface low pressure center to drop from around 993 millibars Saturday morning to 943, yes 943, millibars. ![]() The latest global model forecasts are in remarkable agreement this evening. Yep, that’s two huge storms relatively close to the region in less than 4 days. Now this is amazing we have a second (and stronger!) bomb cyclone developing Saturday night and Sunday. Our big windstorms west of the Cascades almost always occur when a low pressure center tracks within this area When deep low pressure centers track through this area we watch very closely! Generally (for good reason) I have kept the word “bomb” out of my on-air forecasts, but apparently it’s okay now and I sure used it last night! So that first cyclone is now weakening after bottoming out at around 950 millibars well west of the 130W “danger zone”. Somehow national media stumbled upon the term a few winters back and decided it was appropriate for the public to hear. Meteorologists have been watching these storms develop in the north Pacific/Atlantic for decades and that’s the term we’ve always used. Anything over a 24 millibar drop in 24 hours is considered a “meteorological bomb cyclone”. A bomb cyclone is simply an area of low pressure that deepens “explosively” in a short period of time. Tonight’s front is the leftovers of a powerful “Bomb Cyclone” that moved through the northeast Pacific ocean well west of the Pacific Northwest. Things are moving fast/furious now with a strong Pacific jet stream overhead, so weather will be changing quickly from day to day…make sure you are paying attention to forecasts.THERE WILL BE A HUGE STORM OFFSHORE, but it’s far enough away that we get typical wind/rain. No, there is not a mega-storm on the way for the region. You may hear/see something about a powerful storm (or worst ever?) for the Pacific Northwest this weekend.Expect more showers Friday but decreasing as the day goes on. I expect steady rain for a few more hours, then the usual scattered showers behind the front the rest of tonight. Once the storms push through early Wednesday morning, expect skies to clear with lots of sunshine through the weekend and very windy conditions Wednesday into Thursday.After a very warm day with some lower 70s in the metro area, moderate to heavy rain has arrived with a Pacific weather system. This will drag a front through here which will be accompanied by a strong line of showers and thunderstorms with hail and gusty winds being the primary threat. However, a piece of its energy will break off and become its own storm system Monday night into Tuesday and progress towards Texas. ![]() Thankfully, this storm is beginning to weaken as it pushes north towards Alaska. So to see a non-tropical area of low pressure deepen that quick and observe a pressure that low is definitely superlative. If a hurricane in the Atlantic were to rapidly lose pressure, we would be very concerned that we could see a major hurricane develop.Ĭategory four hurricanes generally have a pressure in the 930's or low 940's, very low considering the standard atmospheric pressure is around 1013 millibars. The general rule of thumb is the lower the pressure goes, the stronger the storm is. Meteorologists term this as "bombing out," hints the name. This is closely associated with a rapidly strengthening system. ![]() A bomb cyclone is defined as an area of low-pressure where the pressure in the storm rapidly decreases losing 24 millibars in a 24-hour period. ![]()
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