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Weather forecasting and analysis, space and historic events, climate information
Filtering by Category: HSV
An upper-level low will spin around new England over the next couple of days as an upper-level ridge pattern becomes reinforced over the Plains. Multiple disturbances will impact our region with numerous chances for showers and thunderstorms this week including later this afternoon and evening. Despite lots of clouds, temperatures should be able to climb to the 90 degree mark for afternoon highs.
Read MoreA high pressure system will build into the Southeast US today and a series of disturbances will lift northeast into the area over the next few days from the Gulf region. This pattern will keep it unsettled around here for the next several days with a daily threat of showers and thunderstorms and the highest probability comes during the PM hours. High temperatures over the next few days will be in the mid-to-upper 80’s and overnight lows around 70 degrees.
Read MoreA slow-moving and weakening cool front has moved into the vicinity and it’ll help to keep it unsettled around here for the next several days. The threat for showers and thunderstorms will continue each day through the early part of next week with the highest probability coming during the PM hours. Strong high pressure centered over the Southeast US in coming days will be the main player as far north as the Tennessee Valley.
Read MoreA significant disturbance will approach the region today and it’ll enhance the chances for PM showers and thunderstorms. Some cloud cover today and precipitation could keep high temperatures confined to the middle 80’s for afternoon highs. Temperatures will creep us as we progress towards the weekend and there will be a continuing chance for PM showers and thunderstorms.
Read MoreAn unusually large and intense outbreak of dry, dusty air from northern Africa has crossed the Atlantic Ocean and is now turning skies brownish in the Caribbean Sea. There is a possibility that some of this dusty air mass makes it all the way into the Ohio Valley and Mid-Atlantic later this weekend after first moving over the southern US. This layer of dust is commonly referred to as the Saharan Air Layer (SAL) which is a mass of very dry, dusty air that forms over the Sahara Desert in northern Africa during the late spring, summer, and early fall and it can move westward over the tropical North Atlantic on a regular basis during the Atlantic Basin tropical season. SAL activity usually ramps up in mid-June and peaks in mid-August and sometimes the individual outbreaks can cover vast portions of the Atlantic Ocean and reach as far west as the central US and Central America.
The SAL has unique properties of dry air, strong winds and warmth that can have a significant inhibiting effect on the formation and/or intensification of Atlantic Basin tropical systems - at least on a temporary basis. In addition to its potential inhibiting effect on tropical activity in the Atlantic Basin, dusty air masses that travel over the Atlantic Ocean from Africa can actually have long term impacts on beaches in the Caribbean and soils in the Amazon. This particular outbreak of dry, dusty air is more widespread than usual - perhaps one of the most massive in several decades - and it likely formed during mid-June when strong winds from thunderstorms kicked up dust to an altitude of about 20,000 feet or so over the Sahel region of northern Africa.
Read MoreA significant disturbance will move northward today and into the local region enhancing the chances for PM showers and thunderstorms. Morning cloud cover and precipitation could keep high temperatures today confined to the middle 80’s and it should be similar on Wednesday as well with additional rain possible. In fact, coverage of any shower and storm activity on Wednesday is liable to be even more widespread than today as stronger forcing aloft moves into the region.
Read MoreThe movement of an upper-level disturbance away from the Tennessee Valley will allow for a significant warm up in coming days and highs on both weekend days are likely to be in the lower or middle 90’s with plenty of sunshine and noticeably higher humidity levels. The hot weather will continue into the middle of next week when a frontal system approaches the area.
Read MoreThe Saharan Air Layer (SAL) is a mass of very dry, dusty air that forms over the Sahara Desert in northern Africa during the late spring, summer, and early fall and it can move westward over the tropical North Atlantic on a regular basis during the Atlantic Basin tropical season. SAL activity usually ramps up in mid-June and peaks in mid-August and sometimes the individual outbreaks can cover vast portions of the Atlantic Ocean and reach as far west as the central US and Central America. The SAL has unique properties of dry air, strong winds and warmth that can have a significant inhibiting effect on the formation and/or intensification of Atlantic Basin tropical systems - at least on a temporary basis. This outbreak of dry, dusty air is more widespread than usual and appears to have formed when strong winds from thunderstorms kicked up the dust to an altitude of about 20,000 feet in mid-June over the Sahel region of northern Africa.
Read MoreAn upper-level trough that has been spinning over the Carolinas in recent days will finally edge to the north and it’ll tend to weaken as it does so. The movement of this system away from the Tennessee Valley will allow for a significant warm up in coming days and highs on both weekend days are likely to be in the lower or middle 90’s with plenty of sunshine and noticeably higher humidity levels.
Read MoreThere is a surface low pressure system this morning near the Outer Banks of North Carolina and satellite imagery clearly shows an upper-level low spinning over the central part of the same state. This upper-level has resulted in substantial rainfall in recent days across the Carolinas and westward to West Virginia and southwestern Virginia and it is about to finally make a move to the next. As a result of this movement, showers will move into the DC metro region later today and likely edge into Philly later tonight or early Thursday and once the threat of rain arrives, it’ll likely stick around all the way into next week. In fact, another significant upper-level trough of low pressure is likely to push into the Great Lakes/Mid-Atlantic/NE US by the middle of next week and this will more than likely continue the wet pattern that is unfolding for this part of the nation.
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