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Hydro Issues March 10-12


CT Rain

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Going to make a new thread here specific to the next storm and flood threat. Seems like western NE should be concerned about more significant flooding.

Any thoughts?

06z GFS was pretty bad for the berks and western CT. I haven't looked at ensemble QPF, but it's probably juicy as well.

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Good thread for early awareness...

In route to the office this morning through the 500' elevations of Harvard Mass and there are underground brooks bursting across the roads with ice and slush now... Clearly last week's warmth partially alleviated permafrost and thus we may be compounding any storm system with seasonal run-off if today's chill and tonight doesn't refit that ground ice.

Also, I put some thoughts/observations together regarding the next 2 weeks, over Jerry's turn out the lights thread if anyone is interested...

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man the nam is ugly for western ct, the houssie is going to be raging, not good, not good at all.

6z NAM was very wet for western CT as well. could cause equal, if not worse flooding than what the area saw on Monday...

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Euro keeps the heavy rain west of here

could see thta happening--even the Nam and GFS have the bullseye over SE NY and NE PA...but wouldnt take much of shift to be a problem...plus this one looks warmer further north after a start as snow, so could bring add'l snowmelt south...

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This is going to be extremely interesting to see what transpires here, especially given the fact that we could be dealing with some serious flooding across parts of the region. While at this current time it appears that axis of the heaviest rainfall may occur just west of our region I wouldn't set that in stone just yet. Parts of CT ended up getting much more rain than thought with this past system...even inside 24-HR's most of the models kept the heavier rainfall just to the west but it ended up ticking eastward a bit.

Both the NAM/GFS are indicating a very potent 60-80 kt LLJ developing and working into the area with the winds coming from the SE...this should throw a boatload of moisture into the region. You also have a powerful 60-80 kt MLJ working into the area from the south, just to the east of a pretty deep ML trough. This will yield a great deal of Gulf/Atlantic moisture into the mid levels so the atmospheric column is going to be very, very moist.

With the system tracking just to our west this will throw a warm front northward and this should lift through parts of the region, definitely through all of CT and likely all of MA. This warm front will provide a good deal of isentropic lift which will set the stage for periods of heavy rainfall or even some snow or mixed precip first associated with the warm front. It does appear that this system could actually become occluded with the warm front stalling somewhere in central or northern New England...this could lead to some weak wave development along the front...something to watch as well is with the UL/ML jets streaming from south to north the cold front swinging eastward with the trough may actually stall some and slow down, meaning we could see some weak waves developing along the cold front further enhancing lift.

Looks like the trough may go negatively tilted too and there does appear to be a short window where some elevated instability works in aloft...this could lead to the potential for some elevated convection or some embedded thunder which could locally enhance rainfall rates.

Another thing to pay attention to is what occurs to our north, especially with the Connecticut River. Northern New England got smoked with this past storm with a great deal of snowfall, it's possible portions of this region see mostly rain from this, depending on how far northward the warm front gets and how strong the warm air advection is here. But with a great deal of snow on the ground to our north with the potential for heavy rains here and snow melt all this water is just going to run into the CT River and work downward into CT so this could further enhance any issues.

This has potential to be very serious but we'll need to probably see more than 2-3'' widespread to get major issues and if we see anything over 4'' it could be ugly.

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This is going to be extremely interesting to see what transpires here, especially given the fact that we could be dealing with some serious flooding across parts of the region. While at this current time it appears that axis of the heaviest rainfall may occur just west of our region I wouldn't set that in stone just yet. Parts of CT ended up getting much more rain than thought with this past system...even inside 24-HR's most of the models kept the heavier rainfall just to the west but it ended up ticking eastward a bit.

Both the NAM/GFS are indicating a very potent 60-80 kt LLJ developing and working into the area with the winds coming from the SE...this should throw a boatload of moisture into the region. You also have a powerful 60-80 kt MLJ working into the area from the south, just to the east of a pretty deep ML trough. This will yield a great deal of Gulf/Atlantic moisture into the mid levels so the atmospheric column is going to be very, very moist.

With the system tracking just to our west this will throw a warm front northward and this should lift through parts of the region, definitely through all of CT and likely all of MA. This warm front will provide a good deal of isentropic lift which will set the stage for periods of heavy rainfall or even some snow or mixed precip first associated with the warm front. It does appear that this system could actually become occluded with the warm front stalling somewhere in central or northern New England...this could lead to some weak wave development along the front...something to watch as well is with the UL/ML jets streaming from south to north the cold front swinging eastward with the trough may actually stall some and slow down, meaning we could see some weak waves developing along the cold front further enhancing lift.

Looks like the trough may go negatively tilted too and there does appear to be a short window where some elevated instability works in aloft...this could lead to the potential for some elevated convection or some embedded thunder which could locally enhance rainfall rates.

Another thing to pay attention to is what occurs to our north, especially with the Connecticut River. Northern New England got smoked with this past storm with a great deal of snowfall, it's possible portions of this region see mostly rain from this, depending on how far northward the warm front gets and how strong the warm air advection is here. But with a great deal of snow on the ground to our north with the potential for heavy rains here and snow melt all this water is just going to run into the CT River and work downward into CT so this could further enhance any issues.

This has potential to be very serious but we'll need to probably see more than 2-3'' widespread to get major issues and if we see anything over 4'' it could be ugly.

:weenie:

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