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The above hopefully encapsulates the likelihood of two upcoming significant east coast storms. Changes will occur from the some of the attached supporting graphics but we're in line for more significant weather and I'm sort of concerned about flood potential. This time maybe wet snowfall NYC.? Please consider limiting NYC snow enthusiasm with the stats attached from Don, at least until we get Jan 4-5 (if snow is still in the possibilities). It is hoped the Bluewave produced lack of 2" snowfall at CP can be put to bed, but it's possible that next Sundays probable wintry event will shift a little more inland with rain dominating along the coast. The event for the 10th could be brief snow or ice to heavy rain and snow melt, presuming we accumulate anywhere close to the attached 00z/31 EPS prob of 4" axis. Wind damage graphic via the EPS for the 10th... expectations are more of an e-ne wind (nor'easter we hope) for the 7th with gust potential 40-50 MPH along the coast and maybe minor coastal flooding (tide cycles are LOW for this storm). The event around the 10th "may" have stronger winds gusts vicinity 60MPH along the coast and a better chance of coastal flooding (tide cycles 10" higher to start). Power outages possible but impossible to predict without 24 hour confidence on wind gusts/qpf amounts/ptype/temp if and when it snows. This thread was started since I think there is general interest in snow, also flood potential for this weather interested forum. I may comment once/day but it's all yours. OBS for the 6th-7th will go in here. For whatever occurs the 10th...may have to separate out the OBS in a supplemental thread late 9th, but that's 10 days away and at least a portion of these ensemble expectations may be less than out looked through the 00z/31 cycle and therefore less impact and more routine. No guarantees here but definitely worth monitoring. Edited title 1156AM-Jan 6 to include obs and tags added obs and sleet. Edited title 645 AM Jan 8 iso include OBS for Jan 9-10 and removed the ? behind damaging wind.- 3,610 replies
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Most of our long range looks are well into December now. Hopefully we can have a better winter than last year, which was an all-time worst here. The first week of the month looks to be near normal temp wise and probably drier than normal, even though CPC favors AN precip. -
Carver's spoke of creating an early winter spec thread recently, and after another day in the 70s in August, I figured why not get the ball rolling. This for general long term talk about the potential winter patterns, etc. Right now, the EPO has went negative, it's at -12, and is in the East descending phase. In 2021-22 it fell into the negative in May and stayed deeply negative until the following May. So it should descend throughout winter. Below, average pressure anomalies over NH when the QBO is negative. Higher in the PNA/NAO region, lower over the south and eastern U.S. (These maps may initially appear confusing, since they greens are positive numbers. It just means that the they are higher by those margins over those areas or lower by those margins over those areas when there isn't a -QBO in place. Just keep in mind green = lower pressure and cooler temps during -QBO years) There tends to be higher pressure over the North Pole during a -QBO, which results in a weaker jet stream/polar vortex on average. During an El Nino/-QBO combination our forum region is slightly BN for temps DJF and pressures are quite a bit lower across the Southeast (our storm track). The map doesn't look unlike this for temps, but BN for Texas, Tennessee, North Carolina and up the east coast is more prominent than the CPC map here. Especially over Texas.
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We will soon find out if the high latitude blocking signatures pay dividends for our area. May need a boat and may also need snow shovels. We'll try separating this into threads by month. If that doesn't work, I will simply switch this to Part I of winter. Have fun and good luck!- 582 replies
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Since we do have a variety of forum posters in areas that will see snow/sleet/ZR - at least initially and on the backend, plus there is a flood threat, along with some potential advisory-level winds and possibly record breaking cold, decided to go ahead and make an obs thread. Currently misty and mostly virga and 36 with dp 32 here in NW Philly. -
February discussion for all things winter in the Tennessee Valley Sub-forum. When we have a likely event 2-3 days out we can create an individual thread for said storm. It helps for record keeping purposes as a lot us like to look back on old threads to learn, etc. Hope everyone is doing well.
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It's becoming more and more likely that at the minimum, western forum area members see a dangerous ice event as the week unfolds. The modeling is currently trending towards heavy ice accumulation for West Tennessee, moderate to heavy for the mid-State and Kentucky, and light to moderate over the Plateau areas. These ice amounts would be devastating for trees and the power grid. West Tennessee is actually one of the most freezing rain prone areas in the United States and these massive ice storms happen there.
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January discussion for all things winter in the Tennessee Valley Sub-forum. When we have a likely event 2-3 days out we can create an individual thread for said storm. It helps for record keeping purposes as a lot us like to look back on old threads to learn, etc. Merry Christmas to all as well, I hope everyone has a great holiday.
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Please follow National Weather Service warnings/statements. Starting from another 10 degree morning in NYC, a rapidly changing weather scenario will cause some power outages, accidents (despite a Holiday weekend) and slippery travel for a time in a fairly large portion of the forum, in part due to at least 42 consecutive hours of freezing temperatures on non snow covered ground, and beginning near sundown when the impact of solar insolation lessens. Exactly who gets how much of what is being determined by member observations with model and forecast contributions enhancing, but not hyping interest. Coastal flood threat as per OKX. Usually we like at least 12 hours of gale force onshore flow to build the water levels, but with the astronomically higher tide cycle, 980s MB pressure at Monday morning high tide, an inch of rain in the 6 hours up to high tide emptying from rivers-streams, there should be enough surge and incoming wave action to cause coastal flooding. Working a bit against the flooding NYC southward along the NJ shore is the onslaught of wind abating and turning southerly near the time of high tide. Certainly the early part of the morning high tide cycle looms larger. If you're in a tidal inundation area, follow NWS statements. I'd park my car with parking laws in mind where it can't get flooded. Wind damage: several 12z/16 HRRRX graphics are appended. Please use the legend. Midnight to 6AM is best chance for damaging wind , to occur in a 3hour period ranging from near 2A NYC to near 5A e LI. Gusts to 60 kt possible e LI with gusts 45 kt possible NYC metro airports. I could be too conservative. Have cell phones charged and be prepared for no internet early Monday. Many of our members, even to western LI will be reporting a bit of snow or sleet late today (some are from Ocean Effect already). mPing will be helpful especially for us inland folks just north of I78 where an hour or 2 error in the precip phase change from snow to sleet/freezing rain or rain can mean an inch or two of snow. The 12z HRRR, HRRRX, and 3K NAM seem to support slightly more snow than maybe some are anticipating. Whether that occurs is unknown. No matter, if you have heart problems and live north of I80, you may want some assistance removing slush laden with maybe 3/4" of rain (glop). And of course have your resources to clear it by 6PM Monday when temperatures falling below freezing start the solidifying process. {The HRRRX amounts may be too large by 2", so it is a slower to change model with 1/4-1/2" everywhere up through I84 by 06z, so that could bias the amounts high there. edited in at 1036AM} ICE: I think parts of the I84 corridor including Sussex County NJ may have pockets of damaging ice near 4AM Monday when the ice combined with wind gusts 45 MPH in the ridges could be enough to knock out some power. Monday afternoon-evening: The trough aloft passage and influx of colder air should wring out areas of 0.1-1" snowfall in the steep moist lapse rates associated with the cold pool aloft, including NYC-LI.
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Have added the 5AM January 7 NWS ensemble probability of .01 freezing rain Sunday. These probabilities are quite high for a day 3 forecast. Not talking damaging to trees and wires but with the fresh snow cover, frozen ground and modeled dew points not exceeding 32F Sunday, ice looks highly probable, even to NYC-LI. Depends on timing. IF the precipitation doesn't arrive til 11AM or after in NYC (I95 to the coast) then treated pavements will be okay. Winds at the surface will probably be light southerly-southwest. This should ensure the LI coast to easily warm above freezing in the afternoon, if not during late morning. RGEM and NWS ensemble is the basis of this thread. The GFS still doesn't handle boundary layer temps very well. The EC looks better than the GFS but it too doesn't appear as threatening as the Canadian and SREF (oh no-the SREF?). Also: while the primary thread time frame is Sunday morning, it's possible periods of freezing rain can linger into mid afternoon along the I84 corridor hills which includes nw NJ/se NYS northern CT. Have even seen modeling turn this to a short period of light snow north of I84 but am not convinced.
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Overall assessment as modeling monitored through 6AM Monday. Complex intermittent snow to sleet to freezing rain scenario with potential for 0.1"-0.5" measurable snow sleet NYC-LI while parts of the I84 corridor receive spotty 1 to possibly 2" snowfall. It should begin in NYC/NJ/ne PA/se NYS between 11A-2P and CT maybe between 2-5P. While treated surfaces in metro NYC should be mostly wet, caution is advised everywhere. The National Weather Service has advisories posted for the I84 corridor. I think this could be more of a problem further south in NJ. Also: the worst of this for some of our area could occur near sunrise Tuesday if it clears after midnight and everything refreezes into a frosty icy mess, especially driveways, sidewalks-steps. No thread expected (at least not yet) for late Tuesday-early Wednesday where w wintry hazardous mess is expected again-at least for the high terrain of I84 (strong mid level Frontogenesis). A few graphics to give an idea of what should occur. 631A/27
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West siders are basically guaranteed to get this one at this point. It's currently trending colder valley wide. As with any winter storm here, bust potential abounds, especially eastern valley areas. All modeling currently shows ice, snow or some combination of the two from Arkansas to SWVA. Let's reel it in!
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515A/19: Intermittent event continues and precip intensification gradually changes freezing rain/freezing drizzle sleet near I95 eastward to snow. Ending time still the same, this afternoon sometime ne PA/nw NJ/se NYS and the remainder sometime this evening-early tonight. Between 7AM-ending time, I expect a general base 1/2" new throughout the forum after 7am with possibly as much as 3" , the heaviest seeming to be near NYC into CT per a decent band developing this morning-midday, and possibly a nice hour of closing snow this evening. Easy melting process on pavement expected during the midday-afternoon hours where temps above 25F and when snow lessens it's intensity. Manageable but fun for us. 450AM/18: overall no change in expectations. Might get started an hour or so slower but already flurries or steady light snow have occurred se NYS, ne PA, CT, far nw NJ. See latest NWS products and your own judgement. 548AM added the 4AM NWS regional snowfall expectation that went into their early morning products. An overall manageable 24-36 hour wintry precipitation episode will probably see snow change to a mixed bag in NJ/LI, with even a bit of rain possible for a time eastern LI and the NJ coast. Snow should begin in seNYS/NJ/NYC between 2AM and 7AM Thursday and by 9AM elsewhere. It should snow moderately for a time sometime between 9AM and 4PM Thursday before probably transitioning to mixed precipitation or even quitting for a time in NJ/LI toward Thursday evening. Precipitation may intensify again as it probably changes back to snow everywhere on Friday and then gradually ends from west to east during the afternoon, or early Friday night. Graphics are the 21z/17 NWS ensemble 48 hour prob for 8"+ of snow, 4"+, the 12z/17 SPC HREF snowfall ending 00z/19 = 7PM Thursday, the 5PM/17 actual NWS regional deterministic (approximate) snowfall forecast and the 21z/17 WPC ensemble prob of .01" freezing rain. Thursday afternoon into Friday morning. Please contribute as needed.
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OBS and nowcast Monday Feb 15 - Noon Tuesday Feb 16 2021
wdrag posted a topic in New York City Metro
610A updated thread....my last topic update and all my other posts will be in the observed below. Adding several graphics from the 4AM NWS forecast process inclusive of the ICE STORM WARNING coverage area (purple), the HPC HREF ensemble 1/2" of glaze expectation by 7A Tuesday (blue), WPC ensemble probs of .10 glaze (orange) by 7A Tuesday and the much lower prob of 1/2" glaze. I would expect power outages in the NWS warning area and SPC HREF Blue coverage area. IF these amounts work out- I think it will be big. Modeling doesn't necessarily guarantee freezing longer than 4AM Tuesday, so if it's not, then the rain is non freezing its heaviest 3 hour period. Still the ground is cold so I'd plan on a bad night, and in fact a bad day today in the I84 corridor on all untreated surfaces. Regarding info near NYC... just be careful. Untreated's slippery near NYC-LI today-this evening, should ease sometime tonight. Looking at 06z/15 NAM FOUS...if that surface wind stays ne in NYC through tonight as the sfc low transits coastal NJ, the guidance will be too warm at the surface. This needs careful monitoring. My guess, via the 06z/15 guidance, there may be an underplaying of extensive ice damage, especially just west of the 4AM warning. Just a degree or two makes a huge difference. I'm not expert enough to know for sure. So for me here in Wantage NJ, if its still 31-32F at 4A Tuesday, we've got pretty big problems in far nw NJ/se NYS/nePA. We will see how the probs work. Prep worst and hope for the best. While a bit of snow is possible Monday along the northern edge of the subforum, most of this event should be freezing rain or rain with heaviest amounts Monday night. Sleet may occur as well for a time Monday. If freezing rain lasts long enough in the warning area of the forum, and accretes thick enough, tree damage and power outages would occur. Spotty poor drainage street flooding is possible in NJ, LI. 21z/14 NWS ensemble high probs for freezing rain and low probs for 1/2" glaze are posted. -
Real time Conditions and observations from around the Midsouth, Middle Tn, and North Ms, as this potentially historic system moves into the forum. 14 and light snow in bolivar right now. Gusty winds at times as well(10-15). Good luck to everyone today and stay safe!
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A seemingly - relatively boring advisory light mixed wintry elements event seems to start as snow or sleet near I-195 in central NJ this morning and spreads north to the I78 corridor and LI by mid or late afternoon, eventually changing to a bit of freezing rain tonight. It ends sometime Sunday, probably midday ish. Have ended the topic time as Noon Sunday, since thereafter, temps probably close to or just above freezing with any remaining icing negligible for the remaining daylight hours. The region north of I80 in ne PA/nw NJ/extreme se NYS and s CT should see a period or two of light snow/sleet this evening into Sunday morning but the precip is so light that dry air may evaporate precip with nothing reaching the ground near I-84 in the northern part of our subforum. Uncertainty on precip types and even amounts, but thinking a few tenths of an inch of sleet here and there and certainly slippery at times all untreated surfaces this Saturday evening, Noting any spotty icing near dawn on the 15th as sporadically modeled near NYC is not covered in this thread. Advisories are posted for LI and much of NJ. Please follow NWS advisories and statements on this light prelim event for what appears to be daily bouts of wintry elements in portions of the forum the 15th, 16th, 18th and maybe early 19th. Leaving this last sentence as a place holder for updating the other the other threads by 930AM and deleting at that time once those are updated. Added WPC probabilistic ensemble graphics for today and tomorrow to assist with confidence but are necessarily imperfect due to the proximity of the ocean.
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A challenging period of travel is possible Friday morning across northwest NJ, northeast PA and se NYS; possibly into the CT portion of our forum as multiple bands of precip sweep eastward across the region. Amounts will be light but where possibly freezing rain or sleet, untreated surfaces could be quite slippery. Additionally there will be a tendency for any rain/freezing rain to briefly change to steady snow even to just west and north of NYC with little or no accumulation there, while high terrain in nw NJ/ne PA/se NYS and w CT are modeled to pick up 1/2-2" before melting begins ~ 11 AM or Noon. mPing. This thread will help concentrate interest Friday mornings system while the other threads occupy the Sunday event and beyond.
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Less than a week out and all indicies show both Carolinas getting something... So let's bring this one all the way home
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January Discussion thread, figured it was time to start one given how close we are to the new year.
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mPing should be interesting. The advisory for a mix of wintry elements will probably start with a burst of decent snowfall rates between sunrise and 2PM before a probable change to rain, freezing rain or sleet on LI and I80 southward during the afternoon and possibly back to ice or snow early Wednesday. The i84 corridor should be mostly snow, if not all snow. The region southeast of I95 in NJ after starting as snow or sleet should transition to plain rain by Tuesday night but it might be marginal for icing in Monmouth-Middlesex counties near the colder air sitting astride I80-LI. This I believe is the first expected widespread winter weather advisory event dating back to at least January 3. There's a small chance for a period of flurries along I195 to maybe near I78 in NJ between midnight and 4am but the main event in the NYC forum begins during the daylight hours Tuesday.
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Mostly all rain should be confined to the region s of I-78, LI-NYC. Sleet or snow begins near I78 ~9 or 10A and spreads northeast, possibly possibly drying out to flurries reaching CT/se NYS midday. Thereafter the bigger part of this event occurs 2PM-2AM as mostly wet snow just nw of I95. Heaviest snowfall seems slated for the elevations including the Poconos-Catskills with 3-5", 2 to possibly 5" rest of se NYS, nw NJ along and north of I80 to the Merritt Parkway-in other words west of the CT River, but possibly a dryer zone of under 2" to at most 4" ne CT-central MA. These amounts are uncertain-based on guidance through the 06z/3 cycle. There will be melting on pavement today below 700 feet elevation during the day but a plowable snow seems certain for the hilly areas, especially w of the CT River with accumulation on all untreated surfaces after sundown. The precipitation driver will probably at least in part be an inverted trough developing northwest from a rapidly deepening low pressure system heading east northeast of the mid Atlantic coast. The inverted portion of the trough should be back to the Poconos and that I think is why the heavier qpf tends to be modeled there.
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A routine wintry ice event, that will create some travel problems in high terrain above 1000 feet late today and early tonight, primarily along the I84 corridor.
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Good Wednesday morning everyone, I've followed a recent example on the New England forum and offer this topic as a start over at 1PM with obs-nowcasts. The tags included hopefully cover the gamut of potential amounts. If we are certain about daily records being exceeded please add and ditto if we get top 20 at any xmacis climate site. Thank you all for contributing to the excitement-anticipation of a pretty good nor'easter.
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Figured we could have a separate thread dedicated strictly to December. Should be helpful when looking back on the discussions in the future. Hope everyone is doing well, and I hope we all have a December to remember!
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Good Monday morning everyone, Have offered to focus the general discussion thread on next weekends storm into one single thread. It's been a terrible winter so far s of I80 and not much to boast about north of I80. I'm adding graphics daily at about this time, until the threat fails to materialize. No guarantees on anything. It does not look good for NYC south, so far. Contributions are from the NWS public domain and the Weather.US and the ECMWF. We'll see how this verifies for long range value. The first two graphics are the NWS ensemble chance of greater than .25" water equivalent of frozen precipitation. These are run off of late day ensembles and post, "prior" to the 00z cycle ensembles. The two graphics courtesy of the ECMWF are the chances of 3+" of snow for this event which are increasing a bit in the I84 area and are from the 00z ensembles. No LOCK on any of this coming to pass though I'm pretty confident the interior west and north of NYC will have some sort of winter hazards this weekend. Depends I think, in part on how strong the northern stream short wave is that crosses the Great Lakes. The stronger it is, then I think the storm tracks further north. At 633AM the 14th, I added the 00z/14 NWS ensemble and EPS chance of 3+ inches of snow so that it's easy to go back and compare to reality. The risk has increased a bit for the NWS ensemble system to something similar to the EPS. Certainly no lock for 3+ inches s of I-84. At 457PM/19 added the NOHRSC snowfall analysis. Gives a feel for value in the ensembles. Later, Walt
