dendrite

Illustrative description... The red enclosed obs are METARs...Logan released their hourly ones at :54 past the hour. The blue enclosed obs are 5 minute obs. The METAR (red) obs are released in tenths C so they convert to the exact whole F reading. The 5-min obs (blue) are released in whole integers C so they convert to a decimal F from the vendor sites. So those 73F METAR readings would also be 73.4F in they were a 5-min ob.

Yeah Gene it doesn't work that way. It's a little complicated top understand the hourly METAR obs and how the off-hour 5-min obs work. Logan will never report 73.4F. The 5 minute obs is sent out as 23C to the public. When the vendors convert it to F it gets posted as 73.4F. However, the real temp at Logan at that time is either 73F or 74F because the 5-min obs distributed to the public are in whole degree C instead of tenths. If they released them in tenths C like the hourly METARs, it'd be released as 22.8C or 23.4C which converts to 73F or 74F. In other words, there's a good chance BOS had a 74F in there. A 5-min of of 74F at BOS will be seen by us as 73.4F. But a 73F ob will be 73.4F as well. It's a little confusing. But when you see quite a few 23C/73.4F obs in a row there's a good chance one of them made it to the higher end.

The backdoor snuck southward along the coast. It got PSM first.

OWD 75F holy shit lol

Pack destruction in 36-48hrs.

Melted faster than Mitch this morning.

We took quite the hit. From about a foot down to this. A couple inches away from the trees.

OWD 74 lol

BOS is gonna put up a 74. Already 73.

Yeah that’s still only every 5 mins. It’s better than hourly, but higher highs and lower lows can slip in. And Gene, yeah, that’s my go-to for the 5 minute obs. But they just convert that from whole degrees celsius. So 22C is 71 or 72.

There’s no tenths. That’s either a 71 or 72.

Front is through. Never actually doored although it was close.

It’s about to come through here. I can see the low clouds advancing from the NE. I’m hoping the fropa arrives first from the west.

LCI doored. Gah. Get that crap out of here.

Oh man...the pope just got doored in DAW. Up to 56F here. Blazin'

Sun and shallow snow eating fog.

I didn’t look that closely, but I don’t think temps aloft can support snow there. I’d toss it as a fooled sensor. They’re not going straight to snow with the backdoor anyway. You probably need to fall into the mid 20s before it cools enough aloft for snow.

Went calm with the +RA and it dropped 10 degrees to 48°. Mix this crap back out.

Still 36° at Plymouth....they just can’t mix out. What a pit up there. We briefly fell back to 45° overnight when winds went light, but it mixed back out after 30-45 minutes. 56mph at Gunstock and 60/58 at LCI. Just so surreal out there. I let the birds out with shorts, a tee shirt, and sandals.

You can basically see the door on radar as there’s light returns behind the boundary.

Getting there. Driveway is ice free. Maybe 1-2” pack?

60° at 7am. Take that CAD.

55/49 here. Hope we tickle up some more. Looks like the BD is through BGR.

Pack going down faster than the Ravens.

1P1 only mixed out for like 2 hours today. Back down to 36°. Terrible. Bouncing around in the low to mid 50s here depending on the mixing. Had some brief upper 40s too when winds got really light.