The Weather Today

A series of strong low pressure systems triggering blizzard conditions, high winds and accumulating snow across Alaska will continue through the weekend. Valley rain, mountain snow and high surf are expected for the west coast and Four Corners region through Thursday. By this weekend, winter weather impacts will be on tap for the Mid-Atlantic including snow, flooding and freezing rain. Read More >

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The Weather Today

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The next few days will be quiet until we get to next week where we are tracking a major change in the weather. Snow will be possible on Tuesday with much cooler air expected to move in late next week.

Cosmic Rays Solar Cycle 25 is intensifying, and this is reflected in the number of cosmic rays entering Earth's atmosphere. Neutron counts from the University of Oulu's Sodankyla Geophysical Observatory show that cosmic rays reaching Earth are slowly declining--a result of the yin-yang relationship between the solar cycle and cosmic rays.

Oulu Neutron Counts

Percentages of the Space Age average:

today: -3.8% Low

48-hr change: +0.2%

Max: +11.7% Very High (12/2009)

Min: -32.1% Very Low (06/1991)

explanation | more data

Updated 04 Jan 2024 @ 0700 UT

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Dry weather is expected on Friday with a more widespread light snow on tap for later Saturday into Sunday. May see a few inches from that storm system but keep checking in for updates as get closer to the weekend.

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LOOKING AHEAD

The latest guidance shows that a major weather maker is expected to impact the mid-Atlantic over the weekend, bringing a mix of rain and snow for many, and accumulating snow for some. It is still too early to forecast the exact details, but please be assured that the First Alert Weather Team is closely monitoring the situation and will provide updates as they become available.

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Our reports are scientific! At the start of the 2016-17 ski season, scientists at the University of Nevada, Reno and Sugar Bowl partnered to study regional weather and the impacts of climate change in the Northern Sierra by way of installation of three weather stations. The installation provides important weather-related information to the public via the National Weather Service, US Forest Service and Sierra Avalanche Center, and provides us with important and accurate data for use in our daily snow reporting and Ski Patrol operations.

High pressure building over the weekend bringing generally dry weather throughout. Often fairly cloudy with some sunny intervals though the odd shower possible on Saturday. Turning colder with frosts overnight.

Next week will begin mostly dry with variable amounts of cloud and some sunny spells. The sunniest weather is likely to be in the north and west, although here some overnight fog patches are possible. Elsewhere, probably mostly cloudy with a cold easterly breeze developing in the south. By the middle of next week, the wind should ease and, with high pressure in charge, there should be a good deal of dry weather. Cloud amounts will continue to be quite variable, but all areas should see some sunshine at times. Much colder than recently, with frost probably becoming quite widespread and some freezing fog patches are possible in places. Beyond next week, conditions are likely to remain cold, with an increasing chance of some wintry showers, particularly in the north.

Overview: Turning more settled towards the end of the week with high pressure looking set to dominate. Turning cold also with frost, mist and fog likely.

Thursday night: Thursday night will be mostly dry with long clear spells. There'll be a few showers around, mainly near Atlantic coasts. Lowest temperatures of 0 to 4 degrees with light westerly winds.

Friday: Most areas look set to be dry and sunny on Friday. There'll be some showers near Atlantic coasts and these may drift further inland later in the day. Highest temperatures of 5 to 8 degrees with a light northwesterly wind.

Friday night: Most dry and clear apart from some showers near northern coasts. Lowest temperatures of -1 to 4 degrees with light northwesterly winds.

Saturday: Mainly dry with spells of sunshine and the chance of just the odd shower. Highest temperatures of 4 to 7 degrees with a light variable wind.

Saturday night: Mostly dry with some clear spells. Fog will form overnight in light variable winds. Cold, with lowest temperatures of -2 to +3 degrees.

Sunday: Overnight fog looks like it may linger through much of Sunday in places as winds remain light and variable. Otherwise mainly dry with showers possible in coastal areas. Chilly with highest temperatures of just 1 to 5 degrees.

Further Outlook: Our weather is likely to continue settled and cold as high pressure is expected to stick around into next week.

Temperature circle (C): maximum and minimum temperature forecast for each day. Wind symbol (km/h): arrow points in the direction the wind is blowing. The weather and wind icons: for the time of maximum temperature and minimum temperature.

For the remainder of Wednesday, beneficial rain will continue across parts of northern New England. Scattered Northeastern showers may linger for several days. Meanwhile, smoke from Canadian wildfires will drift southward, leading to widespread haze and some reductions in air quality, especially in the mid-Atlantic, Midwest, and Northeast. Late in the week into the weekend, much needed rain may begin to overspread the Midwest, mainly across the western and southern Corn Belt. Showery weather will also return across the Plains, while occasional showers should occur from northern California to the northern Rockies.

The Denver metro area will have partly sunny skies today, Burroughs said. At night, there is a 20 percent chance of snow with only a trace at most expected. The best chance for snow is in the foothills, he said.

DiscussionHigh pressure passing far N of the islands will settle far NE of the area this weekend, supporting gentle to moderate NE winds today that will become E on Friday. Some strengthening of the trade wind flow is expected over the weekend as persistent low pressure to the distant ENE dissipates. With a mid-level ridge prevailing overhead and near-normal PWAT expected, rainfall will be limited, and most likely over windward slopes and coasts. One exception will be over the upper slopes of Mauna Loa ans surrounding areas, where the lava- induced extreme heating of the atmosphere may lead to the occasional development of pyrocumulonimbus clouds.

Early next weeek, a strong ridge aloft well W of the area will allow for the downstream development of a large cutoff low, roughly along the longitude of the islands. Latest guidance indicates the low will develop just W of the islands, then drift W. This would lead to a strengthening of the ridge aloft over the islands, and a relatively strong surface high pressure cell to the NE that will support locally strong E-SE trade winds. Depending on the eventual location of the low, associated convergence bands could bring increased showers to the W end of the island chain by the middle of next week.

MarineLarge surface high pressure north of the islands will maintain moderate trade winds through late today. Combined seas may near Small Craft Advisory thresholds today as a large northwest swell fills in through the day. As this high sinks southeastward, moderate trades will veer more easterly Friday and persist well into next week. An approaching cold front from the northwest may hang up just west of the state early next week and veer winds more south of east.

A large, long period west northwest (300-310 degree) swell will build in today, peak tonight and Friday morning and then gradually fall Friday night into the weekend. Long period forerunners have been arriving at the Hanalei nearshore buoy this morning with the northwest offshore buoys observing a steady rise in the 16-18 second bands. This swell is expected to be large enough to increase north and west-facing shore surf, due to the more westerly swell direction, to High Surf Advisory (HSA) levels on the main islands (except Big Island) today. This swell may push north and west surf heights up to near High Surf Warning (HSW) thresholds at its peak tonight through Friday morning. This west northwest swell may sneak into Big Island's western waters Friday and increase the odds for placing their west-facing shores within a HSA. A northeast swell moving into our nearshore windward waters Saturday may also lift north and east-facing shore surf across many islands to near HSA levels over the weekend. 17dc91bb1f