Hurricane Agnes

Bottomed out at 20 this morning and made it up to just under freezing with a high of 31. The wind was blowing a lot of the powder off the roofs in the area in any case. I also noticed that some time after noon yesterday, my station's anemometer and vane managed to free themselves from their frozen encasement and were moving again. Currently clear and 29 with dp 14 and I expect the radiational cooling will be in full effect tonight.

OMG it's been a LONG time since we've seen the epic snow pile at your spot! As powdery stuff, six on one side says it would go quickly and a dozen on the other says if there is some rain in there with melting and refreezing, the potential for glacier creation would be there to help build a solid foundation. So far today (and probably the final) my "high" for the day was 23 at midnight as I got no higher than 22 during the daytime hours. It's currently partly sunny but with a high cloud deck moving in, and 22 with dp 9.

Bottomed out at 17 this morning and did the initial car clearing. Thankfully that was some powdery stuff (compared to the powder from the earlier storm that had a 1/4" crust of ice on it ), so was able to clear most of it pretty quickly. The winds have picked up so the snow is now blowing around. Currently a sunny but chilly 21 with dp 10.

I did a double-check earlier this morning to see if any amounts changed after my last 4.25" measurement around 5 pm yesterday, and it didn't, so am going with that. Just came in from removing the snow from the car and thankfully it is some really powdery stuff. I saw the winds had started to pick up so figured better get it done now since it's also blowing around, and that would aid getting leftovers off the roof (have a big SUV). Currently breezy and sunny, with lots of cumulus, and 21, with dp an arctic 10.

10 pm Jan. 19, 2024 PNS - PHL reported 4.6" (ASOS). Looks like far South Jersey and Northern Delaware got under the heavier bands. I may go do one more reading as I noticed some cars that had been cleared after people had returned home from work last night, looked to have been dusted again when I checked this morning.

Did a ~5 pm measurement and that back-build after I did the 3 pm one, did net me another 1/4", so for today (at this point), I am up to 4.25". Am down to snizzle now with temp 27 and dp 25. Mt. Holly's 3:40 AFD for the city mentioned possible stuff rotating around through the rest of the evening so who knows? Some who are north of the current heaviest bands might cash in on some bonus flakes.

Down to SN-- which is a bit more than flurries or snizzle but is probably looking sparse due to the fine pixie dust flakes. Not sure how much that would have contributed to my 4" since the last check, but it looks like the swath of precip on radar is pulling away to the SE. Will probably do one more measurement before it gets too dark (sun is setting just after 5 pm now). Currently 27 with dp 26 and a little bit of fog off in the distance.

Am getting a bit of a back-build band that upped the intensity a bit intermittently.

My 3 pm measurement was 4" on the nose. So far the winds have been non-existent, so I haven't seen any snow blowing around. Am down to SN- with fine flakes, a temp of 28 and dp 26.

You can see that one low rolling OTS!

Last HPC surface map (from about an hour ago I believe) -

12:15 pm measurement was 3.25" and the flakes are back to the smaller/finer type and still going at a steady SN rate. Temp is now 28 with dp 26.

Must be some kind of warm layer up in the atmosphere as I'm starting to get some pancakes mixed in with regular flakes (the fine stuff has been reduced to a min, although the pancakes will help increase the snow pack faster). Temp is still 27 with dp now 26 with some fog. ETA - running an animation of the radar suggests a band is back-building over I-95 so what might have appeared to be a "back edge" hasn't moved that much.

Just measured and have 1.75" on the board with moderate snow. Getting bigger flakes mixing in now and am under a stronger blob. Temp is 27 with dp 25.

I am at my low for the day so far (26) where I had a high of 30 (so far) just after midnight. Currently light snow and 26 with dp 24.

Now have SN with fine powdery flakes quietly building up a bed of frozen precipitation. Eyeballing about 1/2" so far IMBY, with temp at 26 and dp 24. My station anemometer and vane are frozen over (the station is about 7.5ft above the ground so would probably need a ladder to carefully knock off the chunk of frozen slushy snow sitting on top of it, without breaking the wind instruments).

It's showtime! At some point before 6:30 am here, I looked out and a burst of snow apparently came through and added a dusting to cold/untreated surfaces. Currently SN- and 26 with dp 23.

Yeah but the HRRR updates every hour so with each run, you have a new chance at winning!

Currently bopping between 29 & 30 with dp 20. I did finally clear my board this afternoon, so we wait. If the winds appear as progged, it might be tricky to get a good measurement assuming snow ratios will allow it to blow around more.

Gonna have to rely on the short-range models now though. The HRRR will become a friend.

There was something more recent although the band set up just to the north of Philly and Philly (at least IMBY) ended up in a dry slot for an extended period of time hoping for some kind of pivot and/or back-building (that did eventually come). Forgot what year but I am sure the thread is still here!

I actually made it above freezing today, with a high of 33 (when the sun briefly attempted to show through the clouds), a low of 19, and a dp as low as 5 earlier this morning. I meant to tell RedSky that I "saw him" in the east around sunrise before it clouded over, so I knew something was on its way. It's currently overcast and 30 with dp 19. The 19z NBM seems to have the max accumulation right along the I-95 corridor. I suppose a concern might be if a dry slot appears, which I recall happening with past Norlun setups (with one area under a death band and others with zippo).

My high so far today has only been 23, which is my current temp, with dp 8. Have been getting some insolation of the snow in south/southwest-facing areas but anything that had melted after being treated last night, froze into a glacier. I did finally start clearing the car and there was a solid 1/4" layer of ice on top of a couple inches of powder. Mt. Holly's first cut + 3k 18z NAM and a WWA is up.

12z 3k NAM.