Heavy rain and thunderstorms still a threat - WFSB 3 Connecticut

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Heavy rain and thunderstorms still a threat

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HARTFORD, CT (WFSB) -

AFTERNOON UPDATE...

The morning featured wet and stormy weather in Connecticut.  Where storms moved through in the southeastern part of the state, the wind was strong enough to produce damage, knocking over trees and leading to power outages.  In New London, a tree fell on a car killing one and injuring another. 

After a lull late morning/early afternoon, rain will fill back in across the state... expect waves or periods of it through the evening  hours.  It could be heavy at times and we can't rule out some rumbles of thunder.  In towns that have already experienced heavy rain, and if more falls in the same area, poor drainage flooding could become an issue.  It's all compliments of a stalled frontal boundary draped across Southern New England.  In fact, to the east of the boundary in southeastern CT, temperatures are still in the 70s; elsewhere, farther west and northwest, temperatures are only in the 60s with a northerly wind!

Heavier rain will be possible overnight; but tomorrow, we turn the corner on this unsettled period.  

Expect partial clearing tomorrow, with a chance for some isolated showers.  Highs will be back in the 70s.

Meteorologist Mark Dixon 

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MORE RAIN TODAY…

It's a mild and muggy morning with lows in the 60s to near 70 degrees.  A cold front pushed into a very warm and humid air mass overnight and will now stall here in Connecticut.  That means the threat of showers and thunderstorms will continue.  

While we don’t expect an all-day rain, there will be periods of very wet weather.  Some showers will be heavy and there is still a chance for thunderstorms.  The sky will be overcast throughout the day and it will be noticeably cooler than yesterday.  High temperatures are expected to range from the upper 60s to the middle 70s, with the mildest readings over Eastern Connecticut closer to the front.  Despite the cooler weather the air will remain humid.

Once again, localized flooding is possible.  This will not be a statewide problem, but some towns could pick up a few inches of rain between now and tomorrow morning.  The problem we are facing is the orientation of the cold front in relation to the upper level wind flow.  Winds aloft are nearly parallel to the front, which means we could get some training.  That means one heavy downpour after another could move over the same area.  Exactly where this happens remains to be seen, but this is something we’ll need to watch closely.  This weather pattern is developing as the jet stream digs southward over the Eastern United states, carving out a high amplitude trough with a deep southerly flow over the Eastern Seaboard.

More rain can be expected tonight since the front will be slow to move.  The rain will taper off to scattered showers by tomorrow morning as temperatures dip into the 50s and lower 60s as a cooler northwesterly flow develops on the heels of the front.

THURSDAY…

The cold front will finally get some traction and it will begin to move away to the east of New England.  Lingering showers will end in the morning then the sky will become partly sunny.  The humidity will drop and temperatures will peak in the 70s.

SHOWERS POSSIBLE FRIDAY AFTERNOON

Friday will feature some instability in the atmosphere thanks to an upper-level trough that will extend from Canada southward into New England.  After a bright start to the day, there is a chance for some afternoon showers .  Temperatures will be on the cool side Friday afternoon, as the Connecticut River valley and the shoreline will only hit the lower 70s, while the higher elevations will fail to get out of the 60s.

Any showers will clear out Friday evening once the sun goes down.  Skies will clear out and temperatures will drop into the 40s in most of the state – lower 50s along the shoreline – so it will feel very much like fall!

DRY & COOL SATURDAY & SUNDAY…

A large area of Canadian high pressure will be in control of our weather this weekend.  That means mostly sunny skies both Saturday and Sunday, and very low humidity – dew points in the 40s, perhaps even the 30s.  However, the air mass over Connecticut will be quite cool, so high temperatures will only reach the upper 60s and low 70s over inland Connecticut on Saturday and 70-75 on Sunday despite plenty of sunshine!

Saturday night will be clear and quite chilly as temperatures drop into the 40s in most places.  A few upper 30s will even be possible in the typically colder spots.  We can expect similar conditions Sunday night with high pressure centered close to New England.  It will provide clear skies, dry air, and light winds. Those are ideal conditions for cooling!

EARLY NEXT WEEK…

High pressure will remain in control of our weather, but the cool air will gradually modify.  While the mornings will continue to be cool, afternoon highs on Monday will reach the upper 70s and we’ll have a shot at 80 degrees on Tuesday.  Both days will be bright with partly to mostly sunny skies as the humidity will remain low.

HURRICANE IRMA…

Hurricane Irma moved into the island of Barbuda this morning, in the Northern Leeward Islands, as a dangerously strong Category 5 hurricane with maximum sustained winds of 185 mph.  It is one of the strongest hurricanes on record in the Atlantic Basin and the strongest hurricane outside of the Gulf of Mexico and Caribbean Sea.  When it comes to wind, Hurricane Allen (1980) was the strongest with maximum sustained winds of 190 mph.

Irma will move toward the west-northwest over the coming days, impacting the Virgin Islands, Puerto Rico, The Dominican Republic, Haiti, Cuba, the Turks and Caicos, the Bahamas and eventually Florida over the weekend.  Irma is expected to remain a major hurricane throughout this period.

The impact Irma will have on Florida will greatly depend on the exact track, which remains uncertain.  Irma could track near the west coast of Florida, right up the spine of the Florida Peninsula, or over the waters just to the east of Florida.  We will keep you updated over the coming days since Connecticut has many interests in the Islands and Florida.  However, we can say Irma will not have a direct impact on our weather, maybe just some fringe effects at some point next week.

Chief Meteorologist Bruce DePrest with Scot Haney

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