We are slowly but surely progressing to the weekend and we still have not completely resolved the issue of the coastal low offshore and the weather system approaching from the Great Lakes. Models tonight are enhancing some light precipitation along some coastal areas but they all do it in slightly different ways. They all seem to have some sort of trough moving through here Friday morning.
Weather Model Confusion Friday NAM GFS & RGEM FOR FRIDAY
All three models seem to have something going on near the coast with the Canadian RGEM model the most bullish such as it is with precipitation amounts with the coastal low. Amounts are light and around .10 of an inch except between .15 & .20 over Central and Eastern Long Island and the Eastern half of Connecticut. The RGEM suddenly is the slowest of the bunch and the furthest west of all the models. Right now the precipitation is so light that inspite of the cold air aloft the model is calling for rain. This probably means that the bottom of the atmosphere is not sufficiently cold enough to support anything more than a mix.
Weather Model Confusion Friday NAM GFS & RGEM FOR FRIDAY PRECIPITATION FORECAST
All of this is due to how the models are dealing with the deepening trough in the East and how progressive it is moving west to east.
The GFS shows a rather impressive looking trough by Friday morning and that in and of itself would produce some precipitation. The problem is that the trough sharpens a little too far east to impact the coastal low. We can’t see the upper air from the RGEM but given the position of the coastal low it would suggest it is probably a shade west of the GFS.
For now I think the best approach is for a period of wet snow mixed with rain between late Thursday night and early Friday afternoonfor all areas from Eastern Pennsylvania to Southern New England is probably the best approach with this until we can resolve this mess. It is very odd to see the models so wide apart this late in the game regarding this so we have to unfortunately punt until the next 2 runs to get a firm grasp of all this. Either the cold front will cause some precipitation to fall inland, or the coastal low will produce something for the Jersey shore Long Island and Connecticut, or possibly both.
Weather Model Confusion Friday Satellite & Radar Loops
Right now the satellite loop shows a well defined system moving through the Great Lakes while the Southeast radar shows some showers developing that will move into the Southeast and eventually the Carolinas. The RGEM solution is intriguing because it deepens the surface low so far to the west. To be honest, I’m not sure how this is all going to play itself out.
In the meantime Thursday should be a little colder than Wednesday with sunshine giving way to arriving clouds followed by something (God knows what) later Thursday night or during the day Friday. Highs Thursday and Friday should be in the upper 30s to around or just over 40 except lower 40s in areas further south.
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