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Severe weather thread number ...I think X ?


Typhoon Tip

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Berkshire County included in the tornado watch even though I think the best conditions for tornadic supercells will be off to the SW.

Regardless, I guess SPC thinks we're close enough to the trouble zone that it warranted including us in the watch box. Sometimes storms can migrate a bit away from the area of most favorable conditions, hence our being included in the watch.

Still some leftover clouds, but dew points have risen steadily over the past few hours. Can really feel the more humid air now.

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Is that the actual warm front rocketing northeast near NYC? You can see a clearly defined band of clouds racing NE

great observation

matches well with the boundary between DPs 66-68 to the north and 71-75 to the south (though as cpick noted, DPs in 70-72 already entered south coast of SNE)

post-3106-0-20866200-1343328313_thumb.jp

post-3106-0-31126700-1343328338_thumb.gi

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first TOR-warned cell in western PA along I-80:

The National Weather Service in Pittsburgh has issued a

* Tornado Warning for...

northern Clarion County in west central Pennsylvania...

southern Forest County in northwest Pennsylvania...

northern Jefferson County in west central Pennsylvania...

southern Venango County in northwest Pennsylvania...

* until 315 PM EDT

* at 221 PM EDT... National Weather Service Doppler radar indicated a

severe thunderstorm capable of producing a tornado near

Kennerdell... moving east at 45 mph.

* Other locations in the warning include but are not limited to

Kennerdell... Franklin... Clintonville...

Emlenton... Seneca... Van...

Knox... Fryburg... Clarion...

Limestone... Cook Forest State Park...

Summerville...

This will impact the following Highway...

I-80 between mile markers 32 and 90.

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warm front penetrates!

I'd look for scattered discrete cells popping off ahead of that linear gig in western PA/NY... those would develop in a shear saturated environment and [probably] very quickly gain mesos should they develop. Sat shows that warm sector and clearing is coinciding now with deep shear as feared, so this could get ugly after all. Interesting afternoon of observance.

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missed this and hasn't been posted yet:

BOX 2pm update:

2 PM update...warm front is currently situated over central PA and

will continue to lift northeastward over the next several hours.

Expect warm front to begin to move into New York state over the next few

hours and into southern New England approx 4 to 5 PM. Due to potent moist

layer...combined with the lift of the warm front...strong to

severe thunderstorms are likely. Clouds have already started to

break up across PA...NY...and western mass and believe this trend

will continue over the next several hours. Many mesoscale

parameters favorable for severe weather are lining up across CT

and western mass around 21z to 00z. Initial thinking is that

storms will fire along the warm front across CT where the

atmosphere is most unstable. These storms will be isolated and

discrete as there is some turning in the low levels. 0-6km bulk

shear will be near 50kts combined with over 2000 j/kg of

cape...storms will be able to uphold any updrafts allowing for

large hail and damaging winds to be the main threat. Isolated

tornadoes cannot be ruled out as helicity values are near 300. By

the evening hours expect main Mode of storms to be more linear

with possible bowing segments as 850mb jet begins to increase

across southern New England. Expect storms to move eastward across the rest of southern New England

tonight with damaging winds the main threat along with flash

flooding.

Believe there may be several rounds of storms as other storms from

out west will also move into the area...perhaps riding along the

warm front.

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