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  1. Please follow all current and future NWS watches, Warnings and statements. This thread can serve as the one stop shop for both forum participant expectations and observations. Already as of Friday afternoon December 8, flood related watches have been issued for a wide area centered on the I-95 corridor with wind damage potential expected to lie east of I95, excepting possibly in isolated severe thunderstorms later Sunday. Wet snowfall accumulations could slow travel in the Poconos northeastward Midnight to Noon Monday morning. 19Z/8 December Blend of Models snowfall and and rainfall through Monday has been added to show some of the basis of the watches/concerns. Wind guidance has decreased during the past couple of days as the cold front and associated low pressure system drift across the NYC subforum late Sunday and intensifies a little slower. GEFS 18z/8 wind guidance for 50KT gusts as seen through Polar Wx is less than 40% for the eastern tip of LI. This lower wind expectation may also limit coastal flooding to more of a minor event. No matter, there is time for the models to adjust the expected results. So we have an event...not sure how serious but it will impact travel over our area. Continue monitoring the models, including ensembles and of course NWS products. 820P/8 At 851AM Monday December 11 posted review data. The wind did not work out on 50 knots gusts. The rain and snow did. So far, I've seen about 20 streams or thereabouts from southern New England to Philly to either be or forecast to go into minor flood, and one or 2 may go to moderate. Power outages were mostly NYS and ne PA where wet 31-33F snowfall exceeded 4" and wind gusts may have added to power outages. High Point NJ had 5" at 1500'. Modeling was overall good... especially the elevation dependent clarity on positive added snowfall. 19/
  2. Another tropical related event is coming to much of the area as described by our IDA outlook thread participants. It may push the summer totals to near record levels, and possibly start the month of September with a months worth of rainfall in just one day, maybe even in 6 hours. Public impacts will be serious in some areas from the I-95 corridor and LI northward. Thank you for participating.
  3. Snow begins in spurts this afternoon-evening NJ and ne PA and reaches NY and se NYS LI 9PM -3AM and CT 4A-8A Monday. Heaviest continuous snowfall Monday LI/NJ/nePA, but the heaviest delays til Monday afternoon-night in CT. Power outages should become numerous Monday afternoon-evening ne NJ/se NYS/southern CT and all of LI. Coastal flooding for 3 successive high tide cycles beginning late morning-midday Monday with the worst moderate to major flooding possible with the late Monday night high tide cycle. Starter graphic is the snow depth as of Sunday morning 7AM.
  4. Caution: VERYYYYYYY early and this could end up much less robust than outlined below, if the northern and southern streams don't phase, or phase early enough into a closed LOW somewhere over NYS/PA/OHIO. (something always changes from what we see 7 days away but it's posted since there may be some discussion about the potential). Modeling has been trending to a large sub-1000MB sfc low early next week, with it's maximum strength in the mid Atlantic states. Ensembles to start, offer a solid 1" of rain and wind gusts 40 MPH. 12z/24 EPS/GEFS 850MB wind at 06z/1 is around 45KT, not the operational magnitude of the southerly GFS 65KT, GGEM 70KT, ECMWF 75KT, found over LI. Added the baseline D7 graphics from WPC and view these as a start. Added 12z/24 GFS lower wind field for LGA. The Richardson # preliminarily in this single 12z/24 member cycle allows downward from roughly 925MB. (50 KT). Also added the EC PWAT (tropical connection briefly 1.6"+). The 12z/24 operational EC has KI mid 30s generating lightning s of LI suggesting a High Shear Low Cape wind event. Strongest wind threat this early in the modeling is LI/CT. (did not say 50 KT gusts will occur but based only on the modeling, it's possible). A very small chance of some backside snow cover higher terrain western-northern suburbs.... To avoid disappointment on a big wet wind storm not happening, prepare for the more routine WPC scenario, BUT monitor.
  5. Instability should increase today and especially Wednesday with modeled cape and ki increasing a bit as the cold pool aloft drifts nearby. EC lightning density also supports. Low cloud and/or cooling sea breezes probably minimize strong storm potential for the eastern portion of LI. Have not delved into detail of the modeled soundings but yesterdays activity should be repeated, and maybe more so, but not quite the same locations. I'm favoring NYS/NNJ and probably also down from extreme sw CT into the NY metro. It's possible several locations will have as much as 2.5" of rain by Wednesday evening while most of us have, as posted by WPC (less than 1/2"). Hail sizes...unknown, but certainly in some of the afternoon storms. More rainbows - yes. Wind gusts, usually below 35kt, but as per yesterday, several storms might pop damaging wind. Hail and damaging wind are probably not outlooked by SPC through 09z/30 issuance, due to uncertainty and likelihood of not matching their areal coverage criteria for alerting. This continues last weekends interesting weather and added needed rainfall for the NY forum, in what appears to me, another 10 days-multiple episodes of thunderstorms with this noted in the General Discussion Observations topic. Would like to keep this thread to June 30-July 1. Hope thunderstorm production lives up to expectations- I think the stronger storms will be Wednesday afternoon, barring low overcast arriving from New England. Yesterdays LSR map attached and will delete it late today, after the first round. 630A/30 One other note: OKX AFD from early this morning has it well covered.
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