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Found 7 results

  1. 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.
  2. 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).
  3. SPC D1 prompts this topic. Have a little concern that todays strongest storms (2-3" rain producers/damaging wind) will be concentrated down in central or s NJ, but some spots in our NY metro from NYC westward should see isolated SVR late today. Think eastern LI is out of it today. However, with the large CAPE axis just s of us, cannot rule out a cluster of drenching thunderstorms forming-developing eastward later tonight and eventually making it to eastern LI. This latter is with considerable uncertainty.
  4. 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.
  5. I guess today will be bigger in Ny metro than yesterday? Figured I'd start this if you want to use and keep the rest of the reports off yesterdays disappointment topic. Will start with the first posted LSR. Will replace these LSR maps as time permits and events dictate. See SPC D1 and local NWS offices/friends etc for any comments.
  6. For the Tuesday update I would lift the slight into West Kentucky and get the ENH into northern Mississippi - perhaps Memphis. Warm front WF will probably get into West Tenn. Might make it to West Ky. Severe parameters including a screaming low level jet will augment the squall line from the WF south. Upper winds may be less backed than forecast if a lead wave can eject ahead of the bowling ball. A couple leading edge tornadoes would not surprise me. Unfortunately it may be after dark east of the Mississippi River. I'm expecting several to numerous damaging straight line reports, esp if some line echo wave patterns LEWPs can establish. Looks like a set-up favorable to LEWPs esp after dark. Good news farther east is relatively more stable air should keep Alabama, Mid and East Tennessee safe.
  7. Severe weather outbreak looking more and more possible across portions of the lower Mississippi Valley and deep south tomorrow and tomorrow night. This evening the culprit low is located across western Kansas with a warm front stretching along the Kansas border and into northern Missouri. The dryline is located from west of KICT down through western Oklahoma and Texas … roughly along a line from Altus, OK to Sweetwater, Texas and then southwest from there. The cold front is lagging behind in far western Kansas and eastern New Mexico. A fairly large moist warm sector has developed thanks to an extended period of southerly winds off the Gulf. Dew points in the 50s extend almost up to the Missouri/Iowa line ahead of dryline/cold front and will generate instability on the order of around 750j/kg despite clouds and lack of strong radiational heating of the boundary layer. As forcing increase aloft and steeper lapse rates move in, atmosphere will likely pop along/ahead of the dryline as it punches into eastern Texas. Models hinting at two potential dryline bulges north and south of Austin, Texas. This will have to monitored for possible initiation areas as the morning/afternoon progresses. Low level storm relative winds on the order of 20-40 knts and upper/mid level storm relative winds parallel to dry line/initiation axis will promote uniform gust front lifting and upscale growth into a squall line/QLCS structures with damaging winds being the primary threat. Convection will move East with the evening and overnight hours. As it does, shear will increase across Arkansas, Louisiana, Western Tennessee, and Mississippi and hodographs are expected to become open and elongated. Thus, the tornado threat will likely increase as we approach dark and persist into the overnight … especially if more QLCS type structures can be maintained though the time period. Couple this with low LCLs under 500 meters and there could be a strong tornado somewhere tomorrow night … again if semi-discrete QLCS structures persist. Folks across southern Arkansas, northern Louisiana, and western Mississippi definitely need to monitor this situation closely.