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PHL CWA JAN 26/27 OBS and Discussion Thread


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How often do the back end snows work out in this area? Trust me, if that storm moves west of the 12Z GFS guidance, PHL is way more rain than snow, and any snow that falls will have a massively difficult time accumulating. That will cause more ice than anything else, and that wouldn't be very enjoyable.

In most cases it doesn't work out. But this is a special case. Will start out close to freezing in column and then will get a period heavy qpf with strong upward motion with cold air moving in aloft. Note how 500 mb center lags well behind the surface low. That will trigger the heavy snow when it passes south of area. All models show it.

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hr 36 has a sub 992 low about 50-75 miles east of lewes, h5 is closed off at 540 hgt line over orf...

850s are from nyc to phl to east of ric...

.25-.5 qpf from phl to ukt northeast..

.1-.25 everyone else..

2nd area of hvy precip building over dc and wpa and wv

Sounds like more precip and slightly warmer temps from first part of storm compared to other models

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hr 36 has a sub 992 low about 50-75 miles east of lewes, h5 is closed off at 540 hgt line over orf...

850s are from nyc to phl to east of ric...

.25-.5 qpf from phl to ukt northeast..

.1-.25 everyone else..

2nd area of hvy precip building over dc and wpa and wv

sounds like jb's thoughts.

2nd area should be the dumping.

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Wxsim program forecast with 12z GFS/NAM - total snowfall 11" to 13"

Timing etc

IP and Snow by 2pm temp 31.8

Moderate snow from 3pm to 730pm - Temp 28.3 (snow so far 5.0")

Heavy Snow starting about 830pm continuing thru around midnight ( 11.0" new inches on ground at that time)

Snow ends by 3am - total new snow accumulation 11 to 13" with around 18" on the ground by Thursday AM

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Wxsim program forecast with 12z GFS/NAM - total snowfall 11" to 13"

Timing etc

IP and Snow by 2pm temp 31.8

Moderate snow from 3pm to 730pm - Temp 28.3 (snow so far 5.0")

Heavy Snow starting about 830pm continuing thru around midnight ( 11.0" new inches on ground at that time)

Snow ends by 3am - total new snow accumulation 11 to 13" with around 18" on the ground by Thursday AM

thanks again for posting.

i was wondering what the output would be from Wxman :)

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