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OKpowdah

Meteorologist
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About OKpowdah

  • Birthday 03/15/1991

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    http://weather.ou.edu/~splillo

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  • Gender
    Male
  • Location:
    Norman, OK
  • Interests
    Weather, ultimate frisbee, biking, hiking, saxophone, guitar, food

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  1. This is a pretty telling picture. Strong agreement among the CAMs like you said. Widespread severe event looks likely.
  2. Maybe they were *forecasting* snow including what's on the ground in Amherst...?
  3. Figured this still would go in this thread... Lots of fun tomorrow too. Upstream ML low drops over the Northeast, 500mb temps plummet to around -35C. There's no low level cold advection going on behind this storm. Plus low to mid level moisture gets trapped in the broad circulation formed. We're talking total totals >50, even potentially some low level CAPE >100J/kg. Recipe for heavy snow squalls with whiteout conditions, maybe some thunder.
  4. The upper low is going to give you guys some fun for sure. Especially tomorrow. I mean you even have surface based CAPE tomorrow afternoon. Good recipe for squalls with whiteout conditions.
  5. Parents back in Keene, NH reporting 3.5" total so far
  6. For the sake of my own mental health, I'm so happy I'm living in Oklahoma right now. Because if I was back in Keene, NH for the moats in these past two storms .....
  7. The fgen band already overperforming as it is, if the elevated isothermal layer can cool just like a degree more, someone in SE MA is guaranteed 30" with prolonged 3-4/hr rates. Other guarantee is someone just W of this mega-band, and east of some western edge banding, is getting screwed.
  8. Shallow convection. Actually have a little bit of CAPE in the lowest couple kilometers. HRRR has this in the forecast too.
  9. Beginning with the early January bomb and going forward, the last 2 and half months have delivered a very impressive frequency of rapid deepening and deep cyclones inside 65W, and even more remarkably, south of 40N. I mean multiple sub-970 xtrop lows inside 40/65 in a couple months. Amazing.
  10. lol I was tempted to make a map for this storm. I'm sure the snowfall distribution will be as phallic as ever.
  11. DST is EXTREMELY useful now! We need every minute of evening daylight we can get for chasing Prospects of epic banding over eastern New England brought me here to watch y'all get hyped up! What a stretch.
  12. Definitely has been fun to watch the influence of the Pacific on the pattern recently. All the tropical activity in the western Pacific has had really nice clear impacts downstream, translating to the very strong ridging along the west coast. The biggest change from this week to next week I think is a strong consensus for the negative NAO block to break down. The anomalously high heights over the Davis Straights is projected to erode as the trough over the Great Lakes breaks to the northeast. This is supported by the MJO moving into the E Pac and Atlantic, strengthening the South America hadley cell. The rising NAO would translate to strengthening ridging over the Southeast US. So now let's introduce the forecast problem. This comes about next week, starting around day 5-6 (Sunday 10/27). The effect of both Francisco and Lekima recurving in the next few days is the huge LHR, -PV etc. and another wave packet that reaches the west coast ridge by day 5-6, at which point it rapidly amplifies. Alright so the ridge amplifies, then quickly breaks, but then we run into this problem of the downstream pattern. This week we have a nice -2SD NAO which supports the trough in the eastern half of the CONUS. However next week, the trough that digs downstream of the latest ridge break in the west, will run into rising heights in the SE US with the developing +NAO. So by day 6-7 (Monday), the trough is digging into the four corners region, with cold high pressure behind it. The trough is forced to stay positively tilted with ridging in the west folding over, and the ridging in the SE US preventing the trough from digging toward the southeast. So here's where some model differences arise. Quick model discussion: With this trough, the GFS seems to be able to sweep eastward (then damping out as it's forced north of the SE ridge). The ECMWF however, is quick to form a cutoff over California. The cutoff positively feeds back to the SE ridge, perpetuating the cutoff. The western ridge then spills over into the Plains. A problem might be the ECMWF has a bias to overdevelop cutoff lows in the west, which then pumps up downstream ridging over S-central and southeast US. The CMC is doing the same, and it also has a bias for overamplifying these types of troughs which would result in the same cutoff development. Can also see in the GFS ensembles, there are two areas of large 500mb height spread by day 6-7: 1) Western US on the downstream side of the breaking ridge (where we have our uncertainty with the trough evolution) 2) Over southern Quebec with the increasing height gradient in the developing +NAO pattern. So rather than the nice easy forecast for the CONUS this week (+PNA, -NAO, etc.) we get this fight between the Pacific and Atlantic. Ramifications? Well one of the trickier parts of the forecast is with the arctic high that noses down the east side of the Rockies and the potential for a snow storm in E Colorado with the trough in question. But this uncertainty also builds up eastward with the strength of the SE ridge in question and the latitude of the height/temp gradient over Quebec /New England.
  13. Following the recurvature of Typhoon Francisco, we get a huge jet amplification again in the West Pacific, and it looks like both the GFS and ECMWF want to develop an intense low in the poleward exit region by day 7-10. Could get kinda windy around the Aleutians to western Alaska.
  14. We're watching another potential major Typhoon recurving in the West Pacific, passing close to Japan by day 4 (Tuesday night ET). The story begins though with just some simple extratropical cyclogenesis in the northern Sea of Japan and the amplification of downstream ridging. This ridge eventually breaks as it pinches another downstream disturbance, and then bridges with ridging over the eastern Pacific. The favored superposition of negative PV anomalies develops a very strong ridge on the west coast of North America toward Alaska. As Wipha recurves, distributing upper level latent heat and negative PV downstream, we see a huge WPac ridge form, and a rapid acceleration of the jet. On the poleward exit side of the jet, another extratropical system rapidly intensifies near the Aleutians. As the huge ridge breaks, all the cyclonic vorticity on the poleward side of the jet gets dumped into this system over the Aleutians, forming a pretty stable trough over the North Pacific. Day 5-9 (17th-21st): And so now we have the very distinct pattern of a large trough over the Aleutians and blocking ridge over western North America. As you might imagine, this could have some interesting implications over central and eastern North America, with a negative NAO in place over the north Atlantic. At the very least a period of below normal temperatures, and an opportunity for snow in the Midwest.
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