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Since PHI issued their FF Watch yesterday afternoon, guidance is still vulnerable to 2" one hours rains, have opened a thread for commented event info. My thinking is heaviest will occur in the interior of NJ; but NYC nor sw CT, extreme se NYS are not out of the potential. My guess is that if the region north of I78 is to FF, it will probably have occurred by 9AM Saturday with two possible bands, one late this afternoon-eve, and another near dawn Saturday. How much of this heavy convection drifts over into NYC is questionable but t's not impossible to see 1-2" in parts of the 5 boroughs. Maybe the most favored areas are near I78 and possibly the hilly areas of far northern NJ. In any case, convection could impact the evening commute and wet microburst severe wind is not out of the question late today.
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I've added the Wednesday afternoon update from SPC. My focus is basically along the warm front-triple point wherever that traverses. CAPE and wind field/shear is good enough for iso SVR up to I84 late Thu afternoon-evening but I'm thinking more favorable zone is near and south of I78 in NJ-PA. Nevertheless, started a thread due to SPC outlooks, some of modeling dumping 1.5-2" of rain in 6 hours especially in se NYS/n NJ and ne PA. I won't be able to comment much of this thread period so just stay with it patiently and keep up to date on SPC outlooks, NWS Watch/warning/stmts and of course the radar with your observed trends. Never know, there might be a later trend further North into NYS/CT. 12z/28 EC wind algorithm pegs s CT/LI with 40-50kt. -
Despite the fact that it hadn't rained for more than two weeks (Sept 10th general last significant rainfall), the upcoming pattern will probably produce two significant rainfall episodes, Tuesday and then Wednesday-early Thu. One or both of these could result in a few NWS issued Flash Flood Warnings with total 60 hour rainfall in a few spots of the NYC forum exceeding 4 inches. PWAT will be more than 1.5" most of Tue-Wed exceeding 2 inches for brief periods. Isolated SVR may occur along to east of I95 (including LI) but that is a low chance and not tagged as the primary subject matter and not outlooked by SPC this Sunday morning Sept 27 We may want to check for updates on SVR potential early this coming workweek. Have added the Sunday morning D3 WPC Excessive Risk rainfall potential for Tuesday and suspect there will be another issued tomorrow for Wednesday (maybe axised a bit further east). mPING reports will be helpful (flooding and even damaging wind). Hopefully a few of our members will have some 4+" reports by Thursday (max rainfall = very low chance could be 8" but that will require unusual overlapping heavy swaths and so a very low probability, but mentioned due to multiple models trying for this in or near our area). Otherwise, areas of showers/drizzle late today through Monday will precede the Tuesday-Wednesday events, and could produce spotty 1/4" amounts by Monday night. 832A/27
