Jump to content

OHweather

Meteorologist
  • Posts

    4,736
  • Joined

  • Last visited

2 Followers

About OHweather

  • Birthday 09/01/1992

Profile Information

  • Four Letter Airport Code For Weather Obs (Such as KDCA)
    KPOV
  • Gender
    Male
  • Location:
    Reminderville, OH

Recent Profile Visitors

3,948 profile views
  1. Definitely a good call on the late November warm up...suspected we'd get a milder spell, but for a week or so the CONUS will be very mild. Looking into December, I still remain quite intrigued...agree with Matt that I feel like we may be getting somewhere with the pattern pretty soon. the ensembles are increasingly keying on a pattern featuring a -EPO and -NAO into the first half of December, though with an initially -PNA. This would support colder air pressing back into the CONUS starting early next week out west after a relatively brief hiatus (on the broader, national scale). With an initially -PNA the cold air will first focus out west with mild weather over the eastern U.S., though a persistent -EPO and eventual -NAO could change that. Ok, time for some loops: So to start, the pattern early in the loop is a mild one across the CONUS. There’s troughing over Alaska (a positive East Pacific Oscillation/EPO) that’s flooding much of the CONUS with milder air after our impressive mid-November chill. With a -PNA (Aleutian ridge/west coast trough) any limited cooler air is going into the western U.S. right now. But, focus on Scandinavia (northwestern Europe). A persistent Scandinavian block has been ongoing and is progged to amplify this week. First, it sends a blast of cold air into Siberia and the rest of eastern Asia, a key to changing the Pacific pattern. Then, the block is shown on the European ensemble mean to retrograde towards Greenland, causing a negative NAO to develop through early December. This Scandinavian ridge/block has been persistently modeled for a couple of weeks, which is impressive…and it’s also a pretty important piece to the puzzle. The set-up, as everything is currently modeled, seems to support both a -EPO and -NAO developing through the first half of December. The blast of cold air into eastern Asia sends strong high pressure down the eastern side of the Himalayas, in contrast to the current low pressure over eastern Asia. Low pressure lowers the resistance against the planet’s rotation east of these tall mountains, allowing the planet’s rotation to speed up ever so slightly. To conserve angular momentum, the Asian-Pacific jet slows down and retracts. This favors anomalous ridging over the northwestern Pacific and low pressure over western North America…not a cold pattern for the Lower 48. Fast forward to later this week and beyond, when high pressure drops in east of the Himalayas and does the opposite, speeding up and extending the Asian-Pacific jet. This favors lower pressure over the northwest Pacific in the exit region of the jet and pushes the ridge east, while the added momentum into the Pacific jet amplifies that Rossby wave train. Low pressure over western North America is replaced by high pressure descending out of the high latitudes. It’s a much colder pattern for most of the CONUS, though the East Coast will be the last place to consistently get the cold. Also note how Rocky mountain torque is demonstrably important. Early in the loop, high pressure east of the Rockies is in place, which favors intensifying/extending the jet over eastern North America and into the northern Atlantic. This favors low pressure over the North Atlantic in the left exit region and a +NAO. However, a series of low pressure systems developing east of the Rockies in the middle portion of the loop does the opposite, retracting the jet and giving the Scandinavian block room to retrograde. To best illustrate, here's the 250mb wind loop: Early in the loop, the jet streak is breaking near the coast of East Asia and the north Pacific ridge is well to the west. As the jet extends in response to the East Asian Mountain Torque, that ridge is pushed east, a pattern much more conducive for pressing cold air into Canada and towards the continental U.S…also check out the Atlantic. Initially, the jet is roaring off the East Coast, but as low pressures develop east of the Rocky mountains and cause a negative mountain torque, the jet pulls back and allows ridging to retrograde over the North Atlantic. This causes the NAO to trend negatively, and is more conducive to troughing over the eastern U.S. Another way to visualize this chain reaction…cold dumps into eastern Asia. Alaska then goes from cold to mild. Cold air then begins pressing into the CONUS. As ridging retrogrades over the North Atlantic and cold continues to funnel into the west, increasing pressure is put on the Southeast ridge and the eastern U.S. gradually sees cooldowns. Probably a very up and down pattern in the east, and leaning much colder west. In general, as the highest latitudes warm, the mid latitudes cool. The MJO is moving into Phase 7 at a high latitude for the second time this month, and it could end up squeaking into 8: Convection has been favoring the eastern Indian Ocean/western Pacific all summer and fall, a classic more “eastern based” La Nina response: In the late fall/early winter, a phase 7 MJO is typically followed by ridging near Alaska and Greenland, a -EPO and -NAO respectively, with cold first dropping into the west and then spilling east. We are approaching Lag=0 now and will be Lag=1 and 2 next week into the following week (each lag is 5 days): Lots of stuff pointing to a -EPO and -NAO and resulting colder pattern over the CONUS and slightly thereafter Europe as well…though don’t overlook the initial -PNA and Southeast Ridge causing cold to go into the western U.S. first. Can this return to cold through early December bust? As always with a longer range forecast, yes. My main concern is where the tropospheric polar vortex ends up, and if it splits as quickly as modeled over the next 7-10 days: In particular, my concern is where the lobe over northeast Asia ends up. If it ends up dropping a bit farther east, it could mute any ridging into Alaska. I feel that’s on the less likely side, but it’s slightly precarious. If we see the tropospheric polar vortex split like the ensembles currently show, with one lobe into Siberia and another into northern Canada it bodes towards the colder outcome being favored over North America in December.
  2. In Novi, MI right now and the squall the just hit pounded. Quick inch inch and a half in less than half an hour.
  3. Upper deck tickets were less than $20! Figured it was worth it, going up this evening and making half a weekend out of it. I think that is a plausible scenario...the winds over the lake turn 90 degrees in 6 hours tonight, I feel like we're going to see that burst push through the lakeshore quickly. It will be heavy, but I'm not sure if it can add up more than a quick couple inches right near the water.
  4. Still looks like a very intense burst of snow pushes onshore into most of the primary snowbelt late this evening with the cold frontal passage. However, winds come around quickly so the burst will be transient, with WNW flow bands setting up behind it. Still a short duration event, with ridging building in midday Sunday and beyond, significantly weakening bands and shifting them back northeast again quickly through the afternoon. Between the synoptic moisture/support with the cold front, apparent connection to southern Lake Michigan, and crazy instability, parameters are very favorable for heavy snow late this evening through early Sunday. Conditions quickly decline on Sunday, though bands can probably still produce localized moderate to heavy rates through the morning before losing more punch by the afternoon. It will also be windy and the snow will be very fluffy, so it'll blow around. In terms of accums and the warnings, given the short duration of the event and transient bands I do worry that many areas will struggle to quite get to the forecast snow amounts. I do think where those WNW flow bands set-up for several hours later tonight into Sunday morning can get to the forecast, as rates of 1-2" per hour are likely through early Sunday under more organized bands, however those bands will not impact the whole area so those higher totals will be localized...otherwise, probably a general spray of light to moderate accums from the burst along the front followed by the lingering snow showers outside any bands. There is good model consensus that one band with a Lake Michigan connection sets up from somewhere in northern or northeastern Cuyahoga County into Geauga and perhaps far southern Lake, and that may be where some of the heaviest totals occur. Otherwise, we often see a couple other bands set-up in this type of flow from parts of Ashtabula County east across Erie County. Here is a very rough representation of the totals I'm loosely thinking of: A big question mark is where that westernmost band sets up...winds briefly come around to 285 or 290 for a few hours early Sunday, which could get it into a good portion of Cuyahoga and even northern Summit/Portage, but it will have an upstream connection to Lake Michigan and we've seen those types of bands get stuck up closer to Euclid or Mayfield before. Otherwise, I think the rest of the inland core snowbelt gets marginal warning criteria amounts with locally heavier amounts under a couple of persistent bands, with advisory amounts surrounding that. I think the warnings as they are were probably all needed, though I could quibble about the Ashtabula and Erie lakeshore zones maybe being more advisory-worthy I suppose. Cuyahoga has some bust potential, but that western band may be the most dominant and the vast majority of indications are it at least gets into the eastern suburbs, so I think there wasn't much choice but to warn Cuyahoga. I was talked into going up to Detroit later today through the game tomorrow, so I will not be home for this...I guess I'll see if there's any snow on the ground when I get back tomorrow evening.
  5. The HRRR also gets a gold star for its performance in Ashtabula County OH (northeast corner of the state) and Erie PA this last evening...its runs the night before had up to half an inch of QPF in Ashtabula (they got 2-4") and up to 1" of QPF in Erie County PA (they got up to 8")...the QPF was overdone, but it was sniffing something out. That said, subsequent runs showed almost 1.50" of QPF on top of Erie, that was a little overzealous. 0z HREF PMM slightly too snowy, but got the idea right: The 0z Friday RGEM kept it out over the lake, a swing and a miss... As for the rest of this weekend, the progressive nature of the trough leads to a short lived set-up with shifting winds spreading totals out, but on the plus side, the sharpness of the upper-level trough and origins from over Siberia (see loop below) will encourage very intense squalls off the mild November lakes along with gusty winds. A lack of band persistence/longevity will be a limiting factor overall, but if any persistent bands or upstream connections develop heavy rates would allow snow to quickly add up on a highly localized basis.
  6. I'm honestly surprised (though, it's an error of only a few miles), they use an extensive analog method and have it down to a relative science exactly where the bands will go with a given wind direction, and often times leaning heavy on the RGEM works. With that said, the RGEM was a little too far north with the leg of the event on our side of the lake into NE OH/NW PA Wednesday night/Thursday AM as well, and I think while the other models often place the banding too far south, sometimes the RGEM is a little too extreme in the other direction. Curious if downtown makes up some ground later tonight into tomorrow when the wind goes more SW/SSW. Regardless, another epic storm for your area.
  7. A little surprised we hoisted a watch for this already...that said...the synoptic support, moisture, and instability over the lake support a very intense and high-ratio snowband (potentially with thunder and lightning) crashing ashore late Saturday evening into the overnight. However, this band along the front will move quickly so it's probably just a quick coating to couple of inches, then we see where any lingering bands set-up in the WNW flow behind the front. As NEOH said, a short window as ridging and dry air quickly build in on Sunday. It should snow decently under bands into Sunday morning but expect stuff to start shifting northeast and falling apart into the afternoon. While the flow over the lake goes WNW, with ridging building in quickly I could see the band getting to northern/northeastern Cuyahoga and southern Lake into Geauga behind the front and sitting for several hours before weakening/lifting, with probably one or two more WNW-ESE oriented bands with upstream connections into eastern Ashtabula and NW PA. These bands, especially the westernmost one into the east side of Cleveland, will be the best shot to crack warning criteria (6"+). It's certainly possible, but I think warning amounts are pretty localized as the band along the front moves too quickly and the whole event is short duration. Still almost 36 hours to monitor trends in wind direction and the overall organization/longevity of any bands.
  8. Someone near West Seneca will probably get close to 5 feet. Will end up being very similar to the first leg of the massive 2014 storm, perhaps slightly to the north.
  9. Slightly over an inch here this morning. As always down here, I'll take what I can get with a mainly WSW flow event. Northern Ashtabula County (into the Erie area) got absolutely crushed. Ashtabula was jussst starting to snow at 11:30 PM when I left the office last night, and was measuring 14-17" by 7-8 AM today. Believe I saw that I-90 was closed for at least a period of time.
  10. It's certainly a stellar set-up as NWS BUF has been screaming about for several days now...a prolonged period Thursday evening through Saturday night with moisture depth of 10-15k feet on forecast soundings (especially through early Saturday morning), extreme instability with lake to 850mb differentials of 22-24C and lake to 700mb differentials of 30-32C, and equilibrium levels of 20-25k feet...all these values support very deep and intense lake effect off the east end of the lake with thunder. I'm pretty impressed at how steady and close to due southwest the flow is late Thursday night through early Saturday, which seems to be a fetch that favors the city and airport or just south (but not quite as far south as 2014), so the band will probably move little in that timeframe and dump on that general area. I think slightly south of the airport is a pretty good spot, but you have watched those bands closer than I have so you may have a slightly better judgement on where they go with a certain wind direction. Regardless, the amount of moisture, instability, lack of shear, and good lift shown in the snow growth zone supports 2-4" per hour snow rates in the band and if it moves very little for 24-30 hours someone can get 3 or 4 feet...we'll see if it wiggles just a bit and prevents such insane totals, though the flow looks pretty steady...
  11. It will be fascinating to watch how tonight plays out…I would not take the “over” on how far south the band briefly swings late tonight into early Thursday, but it could get as far south as eastern Cuyahoga and central/southern Geauga briefly early Thursday before breaking up a bit Thursday morning and shifting back northeast later in the day. The real interesting area will be closer to I-90, as the band looks to hug the lakeshore for several hours this evening into tonight while getting very intense. Despite the warm lake, that could bury parts of the I-90 corridor. It will be interesting to see what ratios are like and how well it accumulates despite the marginal temperatures, but the feeling is that the intensity will be enough to overcome any temperature issues.
  12. For sure, just saw you commented similar on the prior page. The place to be will be inland a bit where it's not quite as warm but you still get the added benefit of lake enhancement, anything near the lakeshore is more of a parting gift if it works out.
  13. Pretty crazy that a cyclic supercell dropped that many tornadoes in northeast IN/northwest OH in mid November! And obviously, the F3 and F4 were quite substantial. A couple of other rather intense tornadoes occurred that day...one in particular hit Tiffin in north-central OH. It's possible it was stronger than a 3 based on how many houses it swept clean: https://www.weather.gov/cle/event_20021002_tornado_outbreak_tiffin
  14. This is a tough call for right along the lake...our couple of LES events recently have struggled to produce all snow up to the lake until 850mb temps get to about -8C (they've been mixing to the lake at like -5 or -6C if it's heavy enough but not fully going to snow until a bit colder). I'm guessing that between the marginal 850mb temps, onshore wind, urban influence that it'll be tough in Chicago...there could be a window Tuesday night into early Wednesday if surface winds can back more offshore before the lake enhanced band shifts east.
  15. Nov 10, 2002...Veteran's Day tornado outbreak. One of my first actual solid wx memories where I remember what I was doing that day, remember coverage of the event and some meteorological details, etc...an F2 tornado went through my town and missed my house by 100 yards. Probably the closest I'll ever be to a tornado (knock on wood)
×
×
  • Create New...