Allegheny Mountains Weather

June 4, 2019

Canaan cam offline

June 4(Tues)              min.     max      avg

Bitt 2nw Valley       32.6        67.9      50.2

Garrett College       36.3        71.2     53.7

New Germany SP   38           72       55

Can-Heights             37          71       54

CRN-Canaan            38.6      66.6     52.6

Cabin Mt                  41.5      65.3     53.4

Cabin Mt N              42.2      67.6     54.9

Spruce Knob           40.2      66.0     53.1

Snowshoe

Can-Valley Floor     29.4     69.2    49.3

Can-Valley Floor N 25.3     69.8    46.0

7Springs

Lots of sun, mainly clear start, a touch of high cloudiness. Frost in many spots. It was not restricted to the absolute coldest pockets. More clouds towards evening.

Temp profile this afternoon

 

Radar Void

Satellite

Flow

Surface features and 500mb height anomalies and flow

 

Pics-

 

 

 

Worth a mention on how well the models performed from a week out. On May 28th on the Allegheny Mountains Weather Facebook page, I posted about the possibility of valley frost based on the ECMWF, and GFS agreeing. That far out, a tiny change-cloud cover, wind, dewpoint, could easily alter that. The models held and did super in seeing this cold shot.

The GFS tends to resemble the valley locations more, and the Euro, the high ground. As we move closer to the period, within 60 hours, the 3km Nam is my go choice in the attempt to get real close to what the coldest pockets may drop to. Not the 2m temp parameter off the model, but instead focusing in on wind, dewpoints, cloud cover. Then looking at the dewpoints if all else is optimal, and subtracting 3-5° for the cold pockets. Finally with a last check of the GFS as it usually indicates if the cold night will be true or not. On June 3rd, a note sent out to weather friends via email, using this method did well.