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Tag: cold air

  • Dangerous Arctic Cold Targets Delmarva Early Next Week

    Dangerous Arctic Cold Targets Delmarva Early Next Week

    A prolonged stretch of below normal temperatures is expected to grip the Delmarva region beginning Sunday and lasting through the middle of next week, with the most dangerous cold arriving Monday night into Tuesday.

    A deep upper level trough will settle over the eastern United States, allowing an arctic air mass to surge southward into the Mid Atlantic. At the surface, strong high pressure will dominate the region, keeping conditions dry but doing little to prevent temperatures from falling sharply.

    Cold air will steadily build into the region starting Sunday, with daytime temperatures remaining well below average through at least Wednesday. The core of the arctic air mass is expected to be centered over Delmarva Monday night through Tuesday night, when the cold will be at its most intense.

    During this time, overnight wind chill values are expected to fall into the single digits and potentially below zero, especially during the overnight and early morning hours. Current indications suggest Monday night will be the coldest period, with slightly less extreme conditions expected Tuesday night.

    Daytime temperatures on Tuesday are also trending colder, with highs forecast to struggle into the upper teens to low 20s across much of Delmarva. These values are well below normal for mid January and could pose risks to anyone spending extended time outdoors.

    Given the severity of the cold, cold weather advisories or warnings may be issued for one or both nights. Residents are encouraged to prepare now by limiting outdoor exposure, protecting pets, and ensuring vulnerable pipes and plumbing are properly insulated.

    Temperatures are expected to gradually moderate later in the week as the upper level trough begins to lift, allowing readings to trend closer to seasonal averages by Thursday.

  • Bitter Cold Wind Chills To Finish Out The Work Week

    Bitter Cold Wind Chills To Finish Out The Work Week

    A surge of colder air behind a cold front will bring sharply colder temperatures and strong winds to the region late Thursday into Friday, creating dangerously cold wind chills.

    After the cold front moves through Thursday morning, strong cold air will continue to pour into the area through Friday morning. Afternoon temperatures on Thursday are expected to remain stuck in the low to mid 30s, while west winds increase to 15 to 20 mph with gusts reaching 30 to 35 mph. These gusty winds will make it feel much colder, with wind chills struggling to climb out of the upper teens and lower 20s during the day.

    As temperatures fall Thursday night, most locations will drop into the mid teens to near 20 degrees by early Friday morning. Although winds will ease slightly overnight, steady west winds of 10 to 15 mph will persist. This combination of cold air and lingering wind will cause wind chills to fall into the single digits across much of the area by daybreak Friday, with below zero wind chills possible in the higher elevations of the southern Poconos.

    By Friday morning, the strongest push of cold air will begin to ease, allowing winds to turn more southwesterly and temperatures to slowly recover. Afternoon highs on Friday will range from the upper 20s to the mid 30s. However, continued breezy conditions will keep wind chills in the 20s for much of the day, making it feel colder than the actual temperatures suggest.

    Residents are encouraged to dress in layers, limit prolonged exposure to the cold, and take precautions to protect pets, pipes, and vulnerable populations during this stretch of cold and windy weather.

  • Wintry Mix Followed By Arctic Cold To Finish Work Week

    Wintry Mix Followed By Arctic Cold To Finish Work Week

    A developing storm system will bring a brief period of light rain to Delmarva late Wednesday, with the potential for a few snowflakes before the precipitation ends early Thursday. While impacts from precipitation look minimal, the bigger story will be the sharp drop in temperatures and strong winds that follow and last into Friday.

    On Wednesday, a cold front associated with a passing system to our north will move through the region. This front will help produce a shield of light precipitation across the area Wednesday afternoon and evening. With temperatures starting off mild, most locations on Delmarva will see rain initially. As colder air moves in overnight, rain could briefly mix with or change to snow before ending early Thursday morning. Any snow accumulation is expected to be very light, with little to no impact expected across Delmarva.

    A secondary storm system is expected to develop offshore along the Carolina coast late Wednesday night into Thursday. Current forecast guidance keeps this system well offshore, meaning it should have little to no effect on our region. Because of this, confidence remains high that Thursday will be largely dry, aside from a small chance of lingering light precipitation early in the morning.

    Temperatures will be relatively mild ahead of the front on Wednesday, with highs ranging from the mid 40s to near 50 degrees across Delmarva. Conditions will change quickly Wednesday night as colder air pours into the region. By Thursday morning, temperatures will drop into the mid 20s to near 30 degrees. Strong west to northwest winds will develop, creating wind chills in the teens and lower 20s through much of the day.

    Thursday will feel bitterly cold and blustery, with sustained winds of 15 to 25 mph and gusts occasionally reaching 30 to 35 mph. Afternoon temperatures will struggle to recover, only reaching the upper 20s to mid 30s despite some sunshine.

    The coldest air arrives Thursday night into early Friday. Overnight lows will fall into the teens and lower 20s across Delmarva, and persistent winds will push wind chills into the single digits by Friday morning. Friday remains cold, with highs once again in the upper 20s to mid 30s and wind chills staying in the lower to mid 20s.

    While this system will not bring significant precipitation, the combination of strong winds and sharply colder temperatures will make it feel more like mid winter across Delmarva heading into the end of the week.

  • Colder Pattern Looks to Take Hold Across the Eastern U.S. Through Late January

    Colder Pattern Looks to Take Hold Across the Eastern U.S. Through Late January

    A noticeable shift toward colder than average temperatures is expected to develop across much of the eastern United States over the next few weeks, according to the latest temperature outlooks from the Climate Prediction Center. Multiple forecast periods show increasing confidence that below average temperatures will dominate the East, including the Mid Atlantic and Delmarva region.

    6 to 10 Day Outlook: Cold Begins to Push East

    During the 6 to 10 day period, colder air is forecast to expand across much of the eastern half of the country. Below average temperatures are favored from the Midwest through the Ohio Valley and into the Mid Atlantic and Southeast. The Delmarva Peninsula falls within this colder zone, signaling a transition away from recent mild conditions.

    While the strongest cold anomalies are centered farther west early on, the overall pattern supports repeated intrusions of cooler air into the region. Daytime highs are expected to trend several degrees below normal, with overnight lows becoming more seasonable to colder than average.

    8 to 14 Day Outlook: Below Average Temperatures Become More Established

    Confidence increases during the 8 to 14 day period as below average temperatures become more firmly established across the eastern United States. The cooler air mass expands and deepens, covering much of the Mid Atlantic, Northeast, and Southeast.

    For Delmarva, this period favors a sustained stretch of cooler conditions, especially during nighttime hours. Persistent northwest flow behind passing systems may keep temperatures suppressed for several days at a time.

    Weeks 3 to 4: Colder Pattern Persists

    Looking ahead into weeks 3 and 4, the temperature outlook continues to favor below average conditions across much of the eastern United States. While forecast confidence naturally decreases at longer ranges, the signal remains consistent for a cooler than normal pattern.

    Across Delmarva, this suggests limited warm ups and continued winterlike temperatures heading into late January. Brief periods of moderation may occur, but cooler air is expected to return frequently as the broader pattern remains favorable for below average temperatures.

    What This Means for Delmarva

    For residents across Delaware, Maryland’s Eastern Shore, and Virginia’s Eastern Shore, the next few weeks are expected to feature a noticeable chill compared to normal January conditions. While temperatures will fluctuate, the overall trend points toward a colder pattern settling in across the region.

    Overall, the outlook supports a sustained period of below average temperatures across the eastern United States, with Delmarva remaining solidly within the cooler regime through much of the remainder of January.

  • January Thaw Ongoing For Now, Winter Making A Return Towards Next Week

    January Thaw Ongoing For Now, Winter Making A Return Towards Next Week

    With days as of this past week constantly being int he 50’s and even 60’s, many wonder where did winter go? Normally in the winter months across the lower 48 go through a longer duration warming trend as a recharge of the overall pattern and sign are pointing at a return to more winter weather moving back across the eastern half of the US.

    Weather models are all onboard for a bigger shift in the overall weather pattern across the Northern Hemisphere Mainly what’s going on across the Pacific Ocean which is the biggest driver to the Lower 48 weather pattern for supplying the cold air and the active storm track. One thing that is peaking my interests is a significant drop in the Eastern Pacific Oscillation during the time period of the 14th-20th.

    A very large negative Eastern Pacific Oscillation, or EPO, is a significant large scale weather pattern that can strongly influence temperature and storm tracks across the United States, especially during the fall and winter months.

    When the EPO is strongly negative, a powerful ridge of high pressure builds over the eastern Pacific, often near Alaska and the Gulf of Alaska. This ridge acts as a blocking feature, forcing the jet stream to buckle sharply northward into Alaska and then dive southward downstream into western and central North America. As a result, Arctic air is displaced south out of Canada and into the United States.

    For the western United States, a negative EPO often brings colder than normal temperatures, particularly to the Pacific Northwest and northern Rockies. The ridge offshore can suppress precipitation along parts of the West Coast, leading to drier conditions in California, while the colder air aloft supports snow in the higher elevations of the Northwest and Intermountain West when storms are able to undercut the ridge.

    Across the central and eastern United States, the downstream response to a negative EPO is often a broad trough, which allows cold air to spill southward. This can lead to below normal temperatures across the Plains, Midwest, and East Coast. When moisture is available, this pattern can be favorable for winter storms, as cold air at the surface can interact with southern stream systems or coastal lows.

    The strength of the negative EPO matters. A weak negative phase may only produce brief or modest cold shots, while a strongly negative EPO can support prolonged cold outbreaks, sometimes reaching deep into the southern United States. This setup can also increase the likelihood of sharp temperature swings if the blocking ridge eventually breaks down.

    Weather across the Eastern US might get very interesting going forward into the mid-month.

  • High Winds And Cooler Temps Follow Behind Cold Front This Weekend

    High Winds And Cooler Temps Follow Behind Cold Front This Weekend

    A strong cold front moving through the Northeast is expected to bring a period of gusty winds through Sunday night, with the highest wind gusts occurring in the wake of the front. Widespread gusts of 40 to 55 mph are likely across much of the Mid-Atlantic and interior Northeast, including Pennsylvania, New Jersey, New York, and New England. Stronger gusts in the 55 to 65 mph range are possible across parts of upstate New York and areas downwind of the Great Lakes, where the pressure gradient will be strongest. Along the coast, especially across New Jersey, Long Island, and southern New England, gusts may exceed 50 mph, increasing the risk for downed trees, power outages, and travel disruptions.

    Here is a break down per state in the region…

    Delaware:
    Strong winds are expected behind the cold front, with peak gusts generally ranging from 45 to 55 mph statewide. The highest gusts are most likely along the coast and across the Delmarva Peninsula, where marine influence and a tighter pressure gradient could push isolated gusts slightly higher. These winds may lead to scattered power outages and difficult travel, especially on bridges and causeways.

    Maryland:
    Widespread gusts of 45 to 55 mph are forecast across much of Maryland, including the I-95 corridor from Baltimore to Washington. Western Maryland could see locally stronger gusts approaching 55 to 60 mph, particularly in higher elevations and along exposed ridgelines. The combination of saturated soils and strong winds may increase the risk for downed trees and power lines.

    Virginia:
    Much of northern and central Virginia can expect wind gusts between 40 and 50 mph, with higher gusts of 50 to 55 mph possible across eastern Virginia and along the Chesapeake Bay. Coastal and tidal areas may experience the strongest winds as colder air surges in behind the front. Impacts may include isolated power outages, difficult travel for high-profile vehicles, and minor coastal concerns.

  • Winter Takes a Break Across The Country But For How Long?

    Winter Takes a Break Across The Country But For How Long?

    The month of December brought well below average temperatures across much of the Mid-Atlantic region. Averaging as much as 4 to 6 degrees below normal. Putting impacts on energy costs already this early into the season but we are looking to see some relief on those heating bills over the next week. starting Tuesday, we flip the switch from being the freezer to being able to thaw out in a big way.

    Throughout the rest of this week, we are about to go from January weather to what i would say be ;ate October weather as we start cranking up to the 50s. Eventually towards the weekend we are even crossing the 60s threshold. Which is going to feel quite nice after being stuck every day in the 30s. But the real question lies, how long will this warm up will last?

    It appears this will be a week long warm up with the warmest time frame appearing closer to the weekend with highs approaching the mid 60s. But also bring the onset of rain chances as a storm system will be lifting up towards the Great Lakes area. But towards the mid-month, signs are pointing to a return of the west coast ridge allowing for troughs to extend east towards the Mid-Atlantic to bring back more seasonable temperatures. Cold air intrusion would be possible after the 15th when this occurs so that’s when any snow chances would return as of now.

    Enjoy the warmth and thaw while it last as we still have a whole lot of winter to get through!

  • Historic Arctic Outbreak and Potential Severe Winter Storm Poised to Impact Central and Eastern U.S. Next Week

    Historic Arctic Outbreak and Potential Severe Winter Storm Poised to Impact Central and Eastern U.S. Next Week

    A robust Arctic air mass is forecast to plunge into the Central U.S. next week, bringing widespread record-breaking low temperatures and dangerously low wind chills. Meteorologists indicate high confidence in this event, with numerous daily minimum temperature records expected to be set from the central Plains to the south-central U.S. between Tuesday and Friday. Some locations may approach or exceed their lowest recorded temperatures for this late in the winter season, with the freeze line potentially reaching as far south as the Gulf Coast.

    Hazardous Wind Chill Conditions Expected

    Accompanying the frigid temperatures, dangerously low wind chills ranging from -30°F to -60°F are expected across the northern Plains, persisting for several days. These conditions significantly increase the risk of frostbite and hypothermia with even brief exposure. Sub-zero wind chills are forecast to extend southward into Texas, Arkansas, and portions of western Tennessee and Kentucky, posing a widespread risk to public safety and infrastructure.

    Increased Potential for Winter Storm and Heavy Snowfall

    In addition to the Arctic outbreak, there is an increasing probability of a significant severe winter storm forming along the periphery of the cold air mass. While the specific track and intensity remain uncertain, current model guidance suggests that areas from the central Plains and the Ozarks to Kentucky through potentially the Northeast U.S. corridor could experience a highly impactful snowfall. Given the dynamic nature of winter storm development, continued monitoring of forecasts is essential as the system evolves.

    Model guidance continues to grow higher confidence of a severe winter storm with snowfall amounts exceeding 10 inches is becoming more of a reality. NBM probability outputs show very highly probabilities of >60% for 6 inches or more of snowfall with going as far as >30% chance of 12 inches or more of snowfall.

  • Polar Vortex Split Bringing Arctic Outbreak Starting Next Week

    Polar Vortex Split Bringing Arctic Outbreak Starting Next Week

    A significant meteorological event is poised to impact the contiguous United States next week, as the stratospheric polar vortex undergoes a rare split, leading to an arctic outbreak with temperatures projected to plummet 20 to 40 degrees below normal between February 17th and 23rd.

    Understanding the Polar Vortex Split

    The polar vortex is a large area of low pressure and cold air surrounding both of Earth’s poles, residing in the stratosphere. Typically, this vortex remains stable, containing the cold air within the polar regions. However, certain atmospheric conditions can disrupt this stability, leading to a phenomenon known as a Sudden Stratospheric Warming (SSW). During an SSW, large-scale atmospheric waves, called Rossby waves, propagate into the stratosphere, weakening the polar vortex. If these waves are strong enough, they can cause the vortex to split into two or more smaller vortices. This split allows frigid polar air to descend into mid-latitude regions, including parts of the United States.

    Projected Temperature Anomalies

    Forecast models, including the European Centre for Medium-Range Weather Forecasts (ECMWF) and the Global Forecast System (GFS), indicate that one of the split vortex cores will migrate over North America. This movement is expected to usher in a significant cold air outbreak across the northern, central, and eastern United States. Temperature anomalies during this period are projected to range from 20 to 40 degrees below normal.

    Potential for Increased Winter Storm Activity

    The influx of arctic air sets the stage for enhanced winter storm development. As the cold air interacts with warmer, moisture-laden systems from the south, the likelihood of snow, ice, and mixed precipitation events increases. Regions across the central and eastern U.S. should prepare for potential winter storms during this period, with the possibility of significant snowfall and hazardous travel conditions.

    Preparing for the Arctic Outbreak

    Residents are advised to monitor local weather forecasts and heed warnings from meteorological authorities. Preparations should include:

    • Ensuring adequate heating supplies and checking the functionality of heating systems.
    • Stocking up on essential items in anticipation of potential disruptions.
    • Taking necessary precautions for vulnerable populations, including the elderly and those with health conditions.
    • Preparing vehicles for winter conditions, including checking antifreeze levels and ensuring tires are suitable for snow and ice.

    By staying informed and taking proactive measures, individuals and communities can mitigate the impacts of this impending arctic outbreak.

  • Polar Plunge To Finish Out January

    Polar Plunge To Finish Out January

    Large Trough Across The Eastern US

    We went from a extremely warm month of December, to now a January with a vengeance. With 2 snow events in our books and one being the biggest snowstorm in 4 years. We are not going to be done with those snow chances to finish out the month of January. The tropospheric polar vortex will remain quite dominate across Canada with a constant serious of troughs throughout the eastern half of the nation. With the polar vortex hanging around the Hudson Bay, this will allow several short waves to dip down from the Northern Plains all the way to the East Coast.

    ECMWF EPS 500mb Heights

    We are looking at a text book setup for cold and stormy across the eastern half of the nation. Strong ridging across the Pacific Northwest. Ridging over Greenland to act as a block for the persistent troughing across the Eastern US. This created the perfect Rossby Wave pattern for those who love the cold and snow. What is a Rossby Wave anyway? Rossby waves, also known as planetary waves, naturally occur in rotating fluids. Within the Earth’s ocean and atmosphere, these waves form as a result of the rotation of the planet.

    Two sets of Omega Blocks across the Northern Hemisphere pattern. (Omega blocks get their name because the upper air pattern looks like the Greek letter omega (Ω). Omega blocks are a combination of two cutoff lows with one blocking high sandwiched between them.) This keeps these patterns locked in for an extended period of time. Like in this instance for the rest of the month. Get ready to see more arctic outbreaks and snow chances this month going forward. Several storm signals are becoming apparent beginning the 15th through the 26th.