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Friday, June 17, 2022 Severe Potential!!!!!


weatherwiz
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A rather vigorous trough (which spatial scale is too big to be considered shortwave but maybe too small to be considered longwave?) slowly propagates across southeastern Canada Thursday and Friday. A warm front will push through portions of New England Thursday night increasing low-level moisture/humidity along with resulting in scattered showers and thunderstorms. Meanwhile, a cold front will be pushing east across New York and Pennsylvania. 

Computer forecast models have trended a bit on the slower side with the passage of the cold front across southern New England Friday with the front now looking to move across the region during the early afternoon. Given the warm/moist low-level airmass ahead of the cold front, a slower FROPA would allow the potential for instability to build ahead of the front. With the potential for temperatures to climb into the 80's with dewpoints surging through the 60's, the potential will exist for upwards of 1000-1500 J/KG of MLCAPE to develop ahead of the front. Modest mid-level lapse rates will inhibit stronger destabilization from materializing. Given the vigorous trough, dynamics are forecast to be quite impressive for this time of year with a 500mb speed max of 60-70 knots moving across the region from the west with a west-southwesterly llvl jet of 30-35 knots. 

Given the above, scattered showers and thunderstorms are expected to develop ahead of the cold front by late Friday morning and move across the region through the afternoon. Given the strong shear aloft, thunderstorms should quickly become organized and grow upscale into a solid or broken line. Combination of 1000-1500 J/KG of MLCAPE and rather steep llvl lapse rates would promote the potential for damaging wind gusts. Strong shear would also yield the potential for some hail and perhaps an isolated tornado. 

Greatest potential appears to be south and east of I-91 or south and east of a ORH-BDL-DXR line. 

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As has been the case with many days this spring, our convective
potential will be battling very dry air at the mid and upper levels.
Dry air begins to flow into the region behind Friday morning`s
passing shortwave, which will likely inhibit updraft growth as the
second shortwave begins to cross the region during the afternoon.
Models are also varied in how fast we mix out on Friday, as NAM and
GFS model soundings show a capping inversion that sticks around
until almost 23Z Friday. Given how late in the day the cap
erodes, the south coast and Cape Cod may be most at risk for
any convective action, especially given persistent southwest
surface flow.

 

I am more on the bust train for this one, too many things can go wrong including the above. However there is a lot of upside, so if someone goes it could be pretty good.

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