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jimhardy_gw

Weather peeps-check out this update for the storm in this area,so

jimhardy
13 years ago


I live in Fairfield-(for reference).

Long term...

..potentially near historic snow event over southeast 1/2 to 1/3 of

the forecast area on tap...


Overview...key features are showing up which increases confidence on

evolution of this winter storm system. Specifically...onshore data

supports Nowcast tools of rapid occlusion to occur with parent surface

low to slide NE...then north...then briefly northwest to near uin allowing

for heavier precipitation to occur. Initialization and verification

supports primary use of hi-res European model (ecmwf) with forcing inputs from GFS

and 06z 80km NAM-WRF into day 3. Went with blend of European model (ecmwf) and GFS

beyond day 4.


Key comment...this system appears will phase and nearly perfectly

with Canadian Alberta upper low...Arctic air...Gulf moisture and

shear profiles for maximum intensity of snow and thunder-snow over

at least southeast 1/3 of area. This is roughly like several small waves

coming together to form a big wave...another description is

constructive phasing or interference. If surface low occludes rapidly

enough...this would support need to upgrade to blizzard watch due

to isallobaric push to higher wind values of 5+ miles per hour. Occluding

low will also be vital to how much thunder-snow will occur in

forecast area.


Tuesday and Wednesday...rapidly deepening and occluding surface low

will slide to near stl at triple point with parent occluded low to

near uin. This will result in snow...heavy at times with

accumulation rates of 1 to 2 inches an hour over southeast 1/2 of area.

Thunder-snow will be possible far south by 21z and slide to at

least Highway 34 corridor through 09z. It may approach I-80 in

Illinois. Northwest winds will increase to 25 to 35 miles per hour with some gusts

to near 45 miles per hour resulting in nearly blizzard conditions. Went

through several local calculations and came up just short of

upgrading watch to a blizzard watch. Pass this concern to day

shift as a primary issue. Again occluding surface low will be key.


Snow amount gradients will be significant and went with middle of

the Road values with most solutions quantitative precipitation forecast values suggesting poor

entropy or energy dissipation issues. Heaviest snows should occur

+/- 30 miles either side of a Quincy Illinois Peoria Illinois to

near Kankakee line. Snow totals to range from 15 to 20 inches

south of a Sterling to quadrant city to Fairfield line. North of this

line to a Galena to Cedar Rapids to Marengo line 10 to 15 inches

are expected. North of this line second line the gradient of snow

will rapidly decrease to 5 to 10 inches with 5 to 7 inches with

this storm suggested north of Highway 20 near Manchester and

Independence.


Final Point...snow values of over 20 inches are possible if surface

occlusion is again significant enough and will pass this to day

shift along favored aforementioned heaviest snow track.


Will emphasize near blizzard conditions with potential thunder-snow

in chiwswdvn...or next Winter Storm Watch product.

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