By Alex Sosnowski, AccuWeather.com Senior Meteorologist
July 19,2016; 11:39AM,EDT
Locally heavy, gusty thunderstorms will target parts of the mid-Atlantic and re-fire in portions of the Midwest on Tuesday.
The storms will have the potential to be locally gusty and drenching, following locally severe weather in parts of the Northeast and Midwest from Monday.
Meanwhile, less humid air is projected to expand from the Great Lakes region to the interior Northeast on Tuesday.
"The dry air should make significant progress across the Northeast, due to strong northwesterly winds in the middle and upper levels of the atmosphere," according to AccuWeather Chief Video Meteorologist Bernie Rayno.
The lower humidity and slightly lower temperatures should be enough to prevent showers and thunderstorms from erupting from West Virginia and northern Virginia to New England.
Temperatures will be shaved by 5-10 degrees Fahrenheit, compared to highs on Monday in most areas. In parts of the interior Northeast, temperatures will drop by 15 degrees. Instead of highs in the 80s and 90s, highs will be in the 70s and 80s for a couple of days.
"The push of dry air should bring a good deal of sunshine without high humidity from the central Great Lakes to New England, southward to much of the mid-Atlantic through Wednesday and Thursday," Rayno said.
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However, where humidity and temperatures remain high early in the week, storms will likely erupt.
Areas from Iowa and Missouri to portions of Tennessee, southern Kentucky, North Carolina and southeastern Virginia can expect showers and thunderstorms on Tuesday.
Some of the storms in these areas can bring strong wind gusts and flash flooding at the local level.
A stray downpour could develop in parts of eastern Maryland, Delaware and southern New Jersey as well.
The storms could bring temporary relief from building drought in parts of the interior South, including the Tennessee Valley.
Scattered thunderstorms may continue to erupt on a daily basis over the Southeastern states during the middle and latter part of this week. Storms are likely to continue to fire on the rim of the building heat over parts of the northern Plains and the upper Mississippi Valley.
"As very hot and humid air begin to surge eastward from the Plains, there could be a round of thunderstorms from the Great Lakes to the Northeast late in the week into the start of the weekend," Rayno said.
Where storms fail to head off the hot air, temperatures could reach their highest levels of the year so far during Friday and Saturday.
William Smith ·
Works at South Park
Already,accuweather
is backing off on the extreme temps for this weekend. Yesterday,they
had it getting to 100 degrees with a heat index of near 120 degrees for
Sunday,July 24,and now it's going to be mid 90's with heat indices only
slightly above 100. Goes to show that you can't trust their forecasts
past a day or two out because they're always changing it. Next,they'll
change it to 90 with indices in the mid 90's or something and then
they'll change it again 5 more times between now and Sunday.
Why does New York most of the time end up getting humid air with the hot temperatures of 90 degrees or better?
It
has a lot to do with prevailing winds and proximity to the Atlantic
Ocean. The prevailing wind direction in NYC in the summer is from the
South and Southwest, which tends to draw moisture northward from the
nearby Atlantic and the Gulf of Mexico. On rare occasions, hot weather
can occur when the wind is from the northwest or north. During these
episodes, humidity levels, dewpoint temperatures are often substantially
lower. More often winds from the north and northwest bring cooler air
in as well.
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