The temperature reached 74 degrees yesterday at Philly Intl Airport, but a cold frontal passage ushered in considerably cooler air for today with mid-day readings still in the 50’s. It’ll turn even chillier on Wednesday in the Mid-Atlantic region with plenty of clouds around and occasional showers. In fact, some spots may experience some of the lowest maximum temperatures ever recorded for the 6th of May in this unusually cool air mass for this time of year. An even colder air mass is headed this way for the beginning of the Mother’s Day weekend and Saturday could turn out to be quite an amazing weather day in the Mid-Atlantic and Northeast US.
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The contrast between this past weekend and next weekend will be quite remarkable in the Mid-Atlantic region and Northeast US. An unusually cold air mass for this time of year will drop into the Mid-Atlantic and Northeast US by the early part of the upcoming Mother’s Day weekend and it will contrast markedly with the above-normal temperatures experienced this past Saturday and Sunday. In fact, the chill that is headed this way for the late week/weekend may very well result in near record lows across a wide region of the nation extending from the Rockies to the eastern seaboard and snow is even a possibility in the interior higher elevation locations of the Mid-Atlantic and Northeast US. Cold air outbreaks from Canada into the central and eastern US will quite likely continue until at least the middle of the month May.
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Tropical moisture is flowing northward into the eastern US from the Gulf of Mexico, southwestern Atlantic, and the Caribbean Sea. This influx of tropical moisture is combining with a painfully slow-moving frontal system and a vigorous wave of energy in the upper atmosphere to fuel a widespread area of heavy rain that extends from Florida to the Northeast US. The heavier and steadier rain has moved into the DC metro region and should arrive in Philly this afternoon and New York City by this evening. The potential exists for as much as 1.5 - 3.0 inches of rain in much of the eastern US between now and mid-day Friday. Flash flooding will become an increasing concern given the heavy rainfall and the already pretty well saturated grounds. Winds will also be an important factor with this storm system as gusts could easily pass 50 mph in some spots; especially, near and along coastal regions - watch for power outages.
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The active weather pattern that we have been experiencing in the Mid-Atlantic region and Northeast US over the past few weeks will continue well into the month of May aided in part by a continuation of cold air outbreaks from Canada into the central and eastern US. The upper-level jet stream across the country is very active as we wind down the month of April and it has featured numerous strong waves of energy in recent days and another one has dropped southeastward into the Mississippi Valley region from southwestern Canada. This wave of energy aloft and its corresponding surface low pressure system will move very slowly over the next 48 hours due to a blocking pattern in the upper atmosphere over the southern part of Canada. These slow-moving systems and a painfully slow-moving surface frontal boundary zone will combine with an influx of tropical moisture to produce a major rain event from tomorrow into early Friday in the eastern US extending from the Carolinas to New York State. Localized flash flooding is likely to become a serious concern during this upcoming event with 2-4 inches of rain on the table in many areas.
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The active weather pattern that we have been experiencing in the Mid-Atlantic region and Northeast US over the past few weeks will continue well into May aided in part by a continuation of cold air outbreaks from Canada into the central and eastern US. The upper-level jet stream across the country as we close out the month of April is very active and has featured numerous strong waves of energy in recent days and another one is on the way. This next powerful wave of energy aloft will dive southeast from southwestern Canada into the Upper Midwest by tomorrow afternoon and then slide into the Mid-Atlantic region by late Thursday. The combination of this wave of energy in the upper atmosphere, a painfully slow-moving surface frontal system, and a strong flow of very humid air up along the east coast will likely result in a major rain event for the Mid-Atlantic region on Thursday and Thursday night. Given the well saturated grounds from recent rainfall, this type of potential significant rain event could very well lead to localized flash flooding conditions and will have to be closely monitored.
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A very active weather pattern will likely continue across the eastern half of the nation into the early part of May in large part due to a continuation of cold air outbreaks from Canada into the central and eastern US. These on-going cold air outbreaks are combining with increasingly warm and humid conditions across the southern US to help in the generation of storms and also has increased the chances for severe weather outbreaks; especially, across the southern states. In fact, tornadoes this year are running at above-normal levels and are the highest for the month of April since 2011. The next storm in a series of storms will impact the Mid-Atlantic region from today into late Friday and then another system arrives over the upcoming weekend and colder-than-normal conditions will persist through the period.
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A very active weather pattern continues for much of the nation aided by a continuing influx of cold air masses from Canada into the central and eastern US. A strong cold front at the leading edge of the next cold air outbreak will arrive this afternoon in the DC-to-Philly-to-NYC corridor and there can be strong thunderstorm activity with very gusty winds and hail the primary threats. Much colder air will push into the region in the overnight hours riding in on stiff NW winds and temperatures in many suburban locations by early tomorrow will once again be at or slightly below the freezing mark. Multiple chances of rain will follow in coming days and there will be additional cold air outbreaks for the central and eastern US - perhaps into the early part of May.
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The late night and morning hours featured some steady and heavy rainfall rain in the I-95 corridor and it has resulted in localized flash flooding conditions along the DC-to-Philly-to-NYC corridor. The overall precipitation pattern will become more variable for the next several hours with multiple bands and the continued threat for downpours, but also the chance for a “break in the action” at times. As a strong cold front presses to the east across the eastern Ohio Valley, thunderstorms are breaking out to our west. Some of these storms can reach severe levels by the time they reach the I-95 corridor with hail a possibility to go along with heavy rainfall and damaging winds and there is even the chance for isolated tornadoes.
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A major storm will impact a large part of the nation from today into Monday with a wide-ranging set of conditions from accumulating snows in its cold sector to heavy rain and severe weather in areas to the east and south of the storm track. Low pressure will consolidate over the central Plains today and then intensify significantly as it pushes northeastward through the Great Lakes region early Monday and then to the Hudson Bay, Canada region by Monday night. Accumulating snows are likely from this storm from the Rockies to the Upper Peninsula of Michigan where a foot or more can fall. The threat for severe weather will be widespread from today into tonight in the region extending from Texas/Louisiana to the Carolinas and as far north as the Ohio Valley as ingredients come together to destabilize the atmosphere. A significant rain and extreme wind event is coming to the Mid-Atlantic region on Monday with heavy rain, damaging wind gusts of 60+ mph, and perhaps severe thunderstorm activity with hail and isolated tornadoes. All of this will be followed by a cold blast of air for mid-April that will arrive in the eastern US on Tuesday and a weaker low pressure system could produce more precipitation from Tuesday night into Wednesday - and it could even be cold enough for wet snow in some areas.
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A major storm will impact a large part of the nation from tomorrow into Monday with a wide-ranging set of conditions from accumulating snows in its cold sector to heavy rain and severe weather in areas to the east and south of the storm track. Low pressure will consolidate over the Mississippi Valley on Sunday morning and then intensify significantly as it pushes northeastward into the Great Lakes region by Monday morning. Accumulating snows are likely from this storm from the Rockies to the Upper Peninsula of Michigan where a foot or more can fall. The threat for severe weather will be widespread from Sunday into Sunday night in the region extending from Texas/Louisiana to the Carolinas as ingredients come together to destabilize the atmosphere. A significant rain and extreme wind event is coming to the Mid-Atlantic region from Sunday night into Monday and it can include damaging wind gusts of up to 60 mph and perhaps severe thunderstorm activity. All of this will be followed by a cold blast of air for mid-April that will arrive in the eastern US on Tuesday and another low pressure system could even produce some in parts of the Mid-Atlantic by Tuesday night and Wednesday.
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