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Found 4 results

  1. Started a topic that may not bear as much fruit as the recent ELSA of this past week but with the attached 6 hr FFG fairly low now in the immediate NYC suburbs, thought it might be good to heads up some of the potential. Sun afternoon-Tuesday---warm frontal residuals and moisture pooling in weak low lvl WAA and halfway decent winds aloft that diminish considerably on Tue, I think there will be pockets of FF producing thunderstorms that could yield spot 5" amounts in that 60 hour period (slow movers Tuesday). Instability is related to considerable CAPE over 2000J in parts of the area Mon and Tue. Warm fronts can be big rainfall producers and so my thinking is the biggest problems will be I80 south, though some of the modeling gets things cranking up to I84. Suspect a few SVR Wet microbursts each day, especially Monday and Tuesday. Additionally the heat wave should begin Tuesday in the non-marine wind influenced coastal plain with the HI 95-100 Tuesday, Wednesday, Friday and possibly right through the weekend if the 12az/9 EC op is incorrect and the GFS as of 18z/9 is correct on 576 thickness in our area next weekend. My guess, once the heat wave starts, the debate shifts to it's big break... right now I favor longer than the EC and quite possibly lasting through next weekend. Hottest day(s)?: I think Fri when some of modeling has HI 100-maybe 105 near NYC. SVR seems likely to me on Wednesday the 14th due to increasing wind fields, then a drying out Thu-probably nothing that day, with fairly widespread SVR looming either next Fri or Sat when not only CAPE seems pretty large, but wind fields increase quite a bit and more easily sustain a big outbreak. TT toward next weekend increase a bit toward 48-50..not a huge svr signal but together with the wind fields and CAPE, should be interesting. In Summary: Lower FFG, high CAPE suggest pockets of excessive rainfall coming this week, along with SVR storms, esp Mon, Wed, FRI. Who gets the worst and when?? It does appear this will be more than the routine summer week, once again, with the big 500MB ridge along the east coast and troughing hugging the Great Lakes.
  2. The evolving pattern this coming week is continuing to model high CAPE (Heat Index NYC metro non-marine influenced near 100F) Tue-Wed and even Thursday afternoons with enough wind aloft and instability to permit one or 2 days of SEVERE storms in our area. Tuesday SVR appears relegated North of I80 (mainly NYS/CT). Wednesday to me looks like a potentially big day, especially I80 region northward with TT in the lower 50s, big CAPE. Thursday into Friday: Uncertainty on evolution but big CAPE and instability probably remain in the vicinity of our subforum. It too could be a severe day, however of interest is the eventual position of the frontal boundary. IF, it drifts down into our subforum with light north-northeast flow north of it, then it seems to me the projected path of decayed ELSA wind fields and moisture plume - convergence (925-850MB southerly flow overrunning a cool frontal boundary, ranging up to the 200MB RRQ of jet located in se Canada) would promote the potential for a Predecessor Rainfall Event (PRE) as documented in research by NYS associated well known mets. Have added a couple of their composites. These 4+" events occur 24-36 hours in advance of the TC, located hundreds of miles north or northeast of the TC even though the TC itself can miss to the south. If it doesn't and tracks over the PRE then that magnifies the potential sub-basin (mesoscale) trouble. As we are aware, we're starting to pile up the water across our subform so this potential result-NOT guaranteed, should be monitored and we'll see if it can occur, fritter, or displace north of our subforum. I'm doubtful if the potential displaces south of us. My guess is we'll know by Tuesday or Wednesday. In the meantime, I think we can expect severe storm wind/hail in parts of our area during midweek, along with possible storm cluster FF in PW air of 1.6", and probably should monitor the evolution of ELSAs ensembled wind fields up this way. Composites are added, as well as 00z/3 EC PWAT for late Thu (showing the TC well south but PWAT axis up near here). This is imperfectly modeled, the speed and location of ELSA and associated wind fields will adjust and affect the results. Let's see how this may breakdown and whether or not we can pick up ISOLATED 4-6" new rainfall between Tue-Fri in parts of our area-ISOLATED. WPC went to press this morning with a general 1"+ for our area, which supports embedded isolated heavier. You probably recall around the 28th-29th they had our entire area 1.5" for the current ongoing event with general 2"+ central and S NJ. Appears they did quite well. 638PM Monday July 5- EDITED Title to include ELSA- Too much modeling is drifting its track within range of coastal NJ and LI for Tropical Storm considerations Thu night-Friday AM. While it's not certain to make a direct second landfall across LI/southeastern New England, think it best to open the door a little more, at the least for 4+" rains this week combined convective outbursts and whatever Elsa.
  3. Uncertainty as always but SPC has expanded their D1 into our area, and the attached 12z HRRR suggests iso 50-55KT gusts into PA/NJ/LI, mirroring the 00z/19 EC OP. Looks to me like 90-95F today (non marine), decent CAPE. The severe risk suppresses south tomorrow, but WAA begins late Sunday and then both Monday and Tuesday look steamy 90-95F inland, depending on sunshine which also implies cirrus from Claudette possibly tempering heat/cape. This should result in pockets of heavy convection, and where training, could see a ISOLATED max of 4" by 6PM Tuesday. Otherwise, the necessarily more conservative early Saturday WPC outlook works. So while not a big deal (yet) for heavy rain, the convection later today, later Monday and Tuesday could provide some news (damage) footage, including lightning related. Walt
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