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Found 12 results

  1. Leading mid level frontogenesis (FGEN) developing northeastward ahead of remnant DELTA will probably begin showers-sprinkles over NJ/NYC during Sunday afternoon-evening. Subsequent intensifying bands of FGEN associated with a probable sfc low crossing NJ Monday to Cape Cod early Tuesday will lead to periods of moderate to heavy rain with gusty east winds briefly nudging 35 knots coastal LI to Sandy Hook NJ for a time Monday. PWAT generally 1.5 to 1.9" through the event should result in widespread 1"+ of rain with 3"+ more likely reserved for parts of the upslope Poconos, then across central-ne NJ to LI with Isolated 4.5" possible. Best chance of 4.5" seems to be across Ocean Middlesex Counties of NJ "IF" it is to occur. Quite a bit of cold air damming is anticipated and temperatures north of the surface low may only be in the upper 40s and 50s during the day Monday throughout the forum (coldest north of LI, and across se NYS down into extreme nw NJ). Heaviest rain should be done by 11PM Monday evening, but leftover periods of cyclonic flow drizzle and bands of showers associated with the trough axis passage will occur into the early daylight hours Tuesday. Flash Flood Guidance is high so flash flooding unlikely though ponding of water is expected to slow travel at times Monday (in part caused by short periods of heavy rain and some leaf clogged drainage basins). We need the rain.
  2. 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
  3. Have attached relatively high 6 hour FFG, plus the first week of Sept departure from normal rainfall, and the ~Aug 30 NAEFS 52 member D8-14 pattern that suggested near or above normal rainfall along the east coast for week two of Sept, that was posted on p2 of the Sept thread... with a cooler pattern nations midsection abutting a warmer than normal western Atlc temperature pattern. Now we're in the shorter term and modeling consensus has increased the front end of the probable two part R+ episodes -Thursday- and Sunday-Monday(13-14). 00z/9 model guidance is suggesting widespread showery conditions Thursday in the NYC forum, with some thunder. PWAT may rise to 2.3". Have seen a little ensemble guidance suggesting max rainfall of 5-7" in eastern NJ and possibly near NYC. There is enough wind that one or 2 clusters of thunderstorms might produce a wet microburst of severe weather in NJ or even LI on Thursday. My expectation is that everyone in the NYC forum receives a minimum of 1/4" and then in NJ/LI there should be several reports of 3+" with isolated 5" possible. Some of the showers may creep into the southern part of the NYC forum late this afternoon or evening but the main show is Thursday-Thursday night. There could be a couple of leftover showers leftover after daybreak Friday on LI. Normal rainfall in our area for a week period in September seems to be around 1-1.1" though our climate specialists may have other differing information. In any case, have not added Sunday-Monday to this topic... that too could be pretty heavy, though 00z/9 modeling has a slightly less extensive band of 2" PWAT over our area and a couple of models have most of the convection to our east. Would like to see the GGEM operational on board for Sunday. 726A/9
  4. I'll be away for a large portion of this time frame so creating a possible avenue of posts, IF SVR materializes. Have seen a few models with a separate more northerly strong shear zone near I78 to southern LI early tonight. Added a couple of graphics. This matches the SPC D1 Slight Risk. While I think most of the SVR will be south of our forum, needed to cover for a possible potent developing event. You'll know by 7PM what's moving through and/or near KABE. Keep alert on your radar data. IF a supercell develops...real good chance of 1-3" in 30 to 60 minutes. Again, low prob for our area but could not ignore some of the modeled guidance.
  5. Monday-Tuesday: Issued a low confidence topic for more widespread heavy thunderstorms with potential for 2-3" max rainfalls (this was modeled for Sunday several days ago by the EC-but delayed for most of our area-except Ocean County- til Monday). KI is up, actually quite high for Monday morning so we may get a quick start Monday. PW up to near 1.8". Cannot rule out an isolated SVR Monday afternoon but the two day topic includes Tuesday's SPC slight risk. SPC sees more detailed model information than I, so despite my concerns about general nw 850MB flow which tends to be negative for convection holding together east of Appalachians, I've included Tuesday per SPC yesterdays D4 and todays D3. I could see best chance SVR early in the day but this hopefully will be improved as we draw closer. Plenty of wind in the sounding and enough CAPE/KI for sure, but don't quite like the 850 flow. 858A/23
  6. Hi! Decided to start the topic. It would be for rainfall reports primarily, and easing of some recent dryness in a few spots of our forum. FF not likely except maybe southern Ocean County? Lesser flood advisories would probably occur for poor drainage urban flooding Sunday near NYC (IF I'm reading this right?) 1.5"+ qpf differences in operational solutions through the 18z/15 (Saturday) with the EC/UK/HRRR op runs very-very light while the NAM continues furthest north with the 1+". Preliminarily I see a very sharp cut off of rainfall somewhere from Sussex County NJ northward or I84 ~HFD. Suspect two bands of heavy rain in our maybe along I80-I78 corridors thru LI (deformation mid level FGEN ~700 MB in the morning-afternoon, then LI getting the direct storm additional contribution during Sunday evening). The second band across southern Ocean County NJ. This is a best estimate based on modeling. There will be error. The northern band narrow, but widespread 0.5 to a few pockets of 2". The drier zone just south of that band in Monmouth to near I195 Trenton, then the other band over southern Ocean County in the 1.5-3" zone. E Suffolk County total from both daytime deformation FGEN and evening storm 1.5-3". My guess is much of interior se NYS doesn't receive much if any rain and maybe Sussex County too, while we watch some pretty decent bands along I80 or I78? If it's any consolation...the 12z GEFS is a tick higher for NJ/LI and as far north as it's been since the 18z/14 run with 1" skirting the s coast of LI. It's broad output so doesn't get into the banding etc. The 12z EPS is noticeably heavier than the 12z EC operational and about 1/2" shy of the GEFS for LI. I think there is enough information to see a dismally damp midday-evening for much of NJ/LI and some decent rainfall. I think definitely wetter than the 12z SPC HREF. If anything, this a model contest trying to understand reality today and the associated modeling, with the follow through for Sunday. Compromise is always best realizing the downside of forecasting too heavy too far north. 436P/15 (I do not plan to post anymore until Sunday morning - have to ride it out now).
  7. Good Thursday morning, Decided to start a combined topic covering Saturday night, Sunday afternoon and the uncertain impact of ISAIAS this coming Monday-Tuesday. ISAIAS has track uncertainties until everything gets re-organized Friday. Thereafter, I think the EPS/GEFS should nail whether or not tropical storm conditions can impact the coasts. Follow NHC guidance and the contributions from American Weather tropical experts. One reason for uncertainty; I see multiple 00z/30 ensembles showing the northern bounds of heavy rainfall not too far north of our NYC forum which suggests, at this distant date, that a hard right turn of ISAIAS could yet occur that would spare us more than a dangerous rip current situation. In other words, we're on the gradient of substantial rainfall impact. Big forecast busts tend to occur in the ensemble gradients, buying in too early to one set of solutions or another. So dangerous rip currents are my first primary concern for Monday-Wednesday, especially Long Island. Southerly swells should gradually build over the western Atlantic into early next week. Presuming the NHC 5AM Thursday track is reasonable, surge and wind field risks on the western side of ISAIAS are minimal but if the track shifts to where a portion of our area is on the eastern side of the TC, then those risks would significantly increase. My secondary primary concern is isolated 7" rainfall from the necessary combined events of Saturday nights WAA (warm frontal) event, Sunday afternoons possible isolated severe nw NJ/se NYS westward into ne PA, and then finally either a PRE, or a direct impact of ISAIAS Monday-Tuesday. I'm more concerned about Predecessor Rainfall event rather than direct ISAIAS impact. The 7" rainfall in my estimation would probably have to occur west of the I95 corridor due to the ensembles probable combined Sat night-Sunday afternoon events depositing biggest amounts somewhere near the western edge of our forum coverage (~Sussex-Orange Counties?). If Sat night-Sunday does not occur (1-3" combined event band somewhere in that area), then a PRE or ISAIAS hit would have to do all the work by itself and at this time, this is far too uncertain. So to get to 7", it's a lot easier if we see sizable rainfall Sat night-Sunday. There is still a chance not much happens here next Monday-Tuesday-it's in the envelope of possibilities. (See the 06z/30 GFS run). Let's see what happens. I'll be particularly interested in PRE comments. 733A/30
  8. LOW chance of exceeding 4" but this is worthy of awareness, I think. Have reviewed most of the typically used 12z/6 modeling, and WPC/SPC guidance. The scenario is a weak wsw flow aloft at 700 mb, over a very moist (near 15C dew point) 850MB vorticity rich wind shift across NJ (sse-sw) with 500mb vorticity maxima passing newd within an approaching 500mb trough that doesn't swing its broad axis through our NYC forum until about 12z Saturday. Dewpoints are already generally in the mid 60s with PWAT 1.6-1.8",-not overly wet, but with slow movers, plenty to allow for potentially excessive rainfall. How it all works is not clear and odds are that more than 4" of rain won't occur but have seen 12z/6 SPC HREF MAX precip guidance nears 10" in 1 spot of east central NJ and spotty 10+ s of LI. Best axis: unsure but for now along or s of I80 through LI or southward down to near I-195 (Ocean Mercer) counties. It should light up late tonight in central or northern NJ into LI and continues into forenoon Friday,. (Could be one or 2 isolated wet microburst SEVERE's?). For nw NJ, if there is very little tonight then I could see isolated svr thunderstorms in ne PA drift into nw NJ and se NYS late in the afternoon or evening and then continue to LI as showers Friday night. Low prob of occurrence. SPC has no risk and wind fields are generally a little too light. 627P/6
  9. Please see SPC, NWS discussions, any statements, and our own members. Leftover PWAT, relatively strong 500MB (30kt) wind field, modeled CAPE, lightning density, SPC HREF and WPC D1 QPF all suggest pretty decent convection this afternoon dying out by late evening. Combination of convection (expecting several 1.5 to as much as 3" amounts today) and past weeks rains, should more easily permit isolated flash flood. Wind damage, mostly associated with wind and maybe a couple of uproots because of somewhat softer ground. Hail not mentioned but I dont think primary in this leftover tropical environment. Eastern LI seems less likely for SVR/FF this event.
  10. It's a bit early, but while Tuesday may be a subdued day compared to this afternoon in NJ, it appears Wednesday afternoon-evening should be our big convective event of the Mon/6th-Thu/9th time frame, similar or a bit less compared to what occurred today near PHL. KI/CAPE/PWAT slow movers in a fairly steamy uncapped environment developed on the remnant warm front/sea breeze boundaries and subsequent outflows, should promote thunderstorms-"potential"prolific rain producers in part of NNJ/se NYS, spilling east-southeast over Long Island (heaviest for LI probably NYC vicinity, but unknown). Since we saw probable 5-7" rainfall in isolated locations of Morris County NJ and down near PHI on Monday the 6th, it won't surprise if similar isolated 5"+ rainfall occurs in the NYC forum Wednesday. My main concern: do we get enough heating (temp upper 80s)? Potential for short fuse warnings flash flooding and maybe severe wind. Will reassess Tuesday morning, possibly updating this topic. I'm not thinking about the Friday (low chance FAY? per NHC 2PM/6 5D TWO 40%)-weekend cold front events, understanding in part that the Friday event may need to drop into the tropical portion of the forum? (if it becomes named).
  11. Good Friday morning July 3, 2020. This mornings SPC marginal risk, OKX near term discussion covers the basics (both review more data than I). Additionally I like to use SPC HREF which from my daily review WPC uses frequently for its day1 QPF. Have made this a larger window for thunderstorms/heavy rainers due to some of modeling lingering through ~06z, which I think is possible (not strictly heating related convection). Believe most of the big storms are in the 5-10P window associated with 850 MB vorticity-trough passing southward into our area. Regarding Severe: "probably" isolated but power outages from lightning could be somewhat more extensive than the damaging wind gusts due to PWAT briefly near 2" this eve. Can see isolated rainfall 3.5" somewhere in the area... best chance I think is se NYS or NNJ...from 2-3 bands of heavy showers/storms this afternoon, otherwise WPC D1 qpf looks reasonable. Will post as time permits later today/this eve and summarize with final LSR/Rainfall maps sometime around 6A Saturday.
  12. 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.