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Mailman

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Everything posted by Mailman

  1. Seems to me it is just falling in line with the other guidance finally.
  2. How often do you really get a significant storm for the entire state?
  3. Totals are up from 6z on the 12z GFS. Gotta figure PBZ will bump things up a bit.
  4. .SHORT TERM /WEDNESDAY THROUGH WEDNESDAY NIGHT/... An upper level split-flow wave will cross the Ohio Valley into the mid-Atlantic Wednesday into Thursday, bringing a swath of moisture across the Upper Ohio. Associated sfc low pressure will develop across the upper Mississippi Valley before deepening off the Carolinas and riding up the Atlantic coastline. Transient left-exit and coupled jet support are progged to generate broad ascent to support mainly snow beginning Wednesday morning, then ramping up during the afternoon and overnight. Significant uncertainty remains with regards to snow amounts across the forecast area. Deterministic and ensemble guidance continue to support a large range in possible snow totals, primarily due to large differences in QPF amounts and placement of the sfc low to our east. The 00z ECMWF run in particular places the sfc low much farther west and north than previous cycles, though without full EC ensemble and other deterministic agreement, this was not enough reason to significantly inflate our official snow totals at this time. Some question also remains with the extent of warm advection across the lower elevations of WV into SW PA on Wednesday afternoon/ early evening as this could impact initial snow totals. With further penetration of warm air, some potential also exists for brief freezing rain across this area and into the lower ridges. However, the window for this is small, as more substantial warm advection would likely bump marginal sfc temperatures above the freezing mark. Rapid system progression also presents a barrier to high snow totals, as the system quickly shifts off the coast early Thursday morning and shuts off efficient snowfall. Highest snow totals remain over the Allegheny Mountains and ridges, with lesser snow farther west. Confidence in 8+ inches of snow is high enough across the higher elevations to support an upgrade from Watch to Winter Storm Warning in those areas. With increased snow amounts forecast farther west, the Watch was also expanded to include areas including Pittsburgh. Lower confidence exists across the lower elevations of Monongalia and Marion counties where warmer temperatures will likely inhibit initial snowfall totals. Watches and Warnings are in effect from 7AM Wed through 7AM Thu. Advisories will likely be needed for areas farther west, especially if the upward trend continues.
  5. Would be nice to see the GFS move closer to the others here within the next hour just to lessen my doubts a little.
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