CarlislePaWx

At 8:00am here in Carlisle...the temperature is 10.2 degrees and the dew point is 7.0 degrees. Snow officially began at exactly 1:00am. It is currently snowing moderately with very fine flakes. I just measured 3.4" on the board which gives a storm total thus far of 3.4" This reminds me of both Jan 1996 and Feb 2003 with the snow falling and a temperature of 10 degrees. I haven't read any comments yet so I will go back to catch up. See you at 9.

At 10:15pm here in Carlisle...radar echoes show that virga has been over me for the past 30 minutes. Snow has not yet begun to fall. My current temperature is 14.5 degrees with a dew point of -1.7 degrees and a wet bulb of 11.5 degrees. This leaves the possibility of a small drop in the temperature once steady snow begins. I'd say I drop to around 13 degrees and then hang out there for at least several hours as long as the snow falls steadily and moderately. For my point-n-click the NWS has delayed the potential onset of sleet until after 6pm. They only mention the sleet potential in the overnight forecast, and even there they still say a possible mix with sleet until 1:00am. My range of accumulation has not changed from the morning forecast. They are still projecting a range of 9-17". They also are giving me a 50/50 chance of exceeding 12" (as noted in the earlier graphic). Let the fun begin!

Don't forget for the contest I predicted 19.59" of snow. Maybe I still have a shot at this?

I think the Jan 2016 storm would be the most recent. That's the storm with 35" I recorded. I know at the time the snow started early Saturday morning my temperature was 17 degrees. I can't remember precisely where the temp was at the end, but it couldn't have been any higher than the low 20's.

This looks infinitely better than 0Z last night. My point-n-click gives me a range of 12" - 20". My prediction of 19.59" is still inside the NWS range...lol

Next weekend's storm (only)...

I'll go with 19.59" (my birth year). I do measure all snowfall to the nearest tenth of an inch (0.10") which is the official way to measure snow.

The Jan 2016 storm produced the largest single storm total of my life with 35". There were multiple hours with 3"/hr along with at least one hour with 4" and a whopping 5" for one hour. Temp was in the mid to upper teens for the duration. That storm was preceded by the early Feb 2010 storms with 27" for the first storm and another 13" 3 days later for the second storm. 40" of snow was more than the total season average. The total snowfall for the 09-10 season was 70". There's been nothing close to that in the 25 years I've lived here. By the way, my low this morning was +1.8 degrees F. I failed to hit zero. This was the coldest low thus far this winter. I have a feeling there are going to be multiple sub-zero lows coming up in the next 2 weeks.

Wow...Do you see what just happened with this run vs. the 18z? The southern extent of the 12"+ line has moved over 150 miles north from the VA/NC line to now central Virginia. We definitely don't want much more north trend. The LSV is now close to some of the max numbers that were previously down in northern VA. Definitely will be interesting to see how the axis of heaviest continues to evolve over the next 72 hours.

Here in Carlisle (at 12:25am) my projected low temp of zero degrees upcoming around dawn is getting really close. I'm now down to +4.3 degrees F. I've been as low as +3.9 F. Temps with radiation nearly always fluctuate up and down.

Hey Guys... Take a look at this. These are the forecast temperatures at 7AM Tuesday morning. Some of these temps have to be historical. Atlanta is -18 F degrees. Nearly all of Kentucky and Tennessee is between -10 and -20 degrees. Places like Atlanta are likely going to experience a crippling ice storm, along with a ton of locations in the deep south. What if these people lose power during the ice storm and then have temperatures near 20 below zero before power is restored? I'm not trying to throw cold water (sorry for the poor pun) on this upcoming event. Up here regardless of the final snow totals, we will likely not lose power because of how light weight the powder is when the entire storm snows with temps in the low teens start to finish. Say some prayers for all of them.

All it takes is literally just 1" of snowcover combined with optimal radiational cooling to cause plummeting temperatures. My low this morning was 8.4 degrees. I have just surpassed that with a new low of 7.7 degrees, and tanking. My dew point is -1 degree F, so there's a decent shot at a low of zero tomorrow morning. My coldest minimum so far this season is +3.4 degrees which occurred back on December 16th. The two days prior saw a total of 1.3" of snow, which was the cover that morning.

The evolution of the GFS Thursday bomb is wild. The low initially comes up from the southwest and makes it nearly to State College. Then the brakes jam on, the low completely stops and proceeds to secondary due south to south central Virginia at which point it begins bombing, crashing from 997 to 983. I don't have to even look at the upper air maps to know that the low has to cut off and become stacked. It then jumps northeast to the tidewater area producing near blizzard conditions in DC/MD/DE with the low center over the northern most tip of Chesapeake Bay. So the cold air has completely encircled the low center as it brings the heavy snow up into south central / south eastern PA / then southern NJ, then northern NJ / NYC and onward to the northeast. Let's just say I did a little paraphrasing above, so I haven't described it as seen verbatim, but reasonably close. I can't think of a snowstorm that ever traversed the path the GFS is showing here. Instead of a secondary jumping to the coast, it jumps due south from our region and pops over south central Virginia before it slowly progresses NNE along the coast and even just inland over Maryland. Anyway, I took the time to do the PBP only because of the low's evolution and wild path it is shown to take. That caught my eye more than the snow, that is until accumulations around here had reached 12-20"...lol. Okay, that's it for me. (I hope you all know I don't believe it will likely pan out like this.) But it's just great to be tracking again, and even a potential monster later next week.

I just melted down my freezing rain and sleet. It came out to precisely 0.25" (liquid). There was no plain rain recorded throughout the entirety of the event as the temperature never went above 32.0 degrees. Ice-coated trees and grass are barely showing signs of melting with a current temperature of 33.6 degrees. Pavement and sidewalks are mostly ice-free now. They experienced the least accumulation of ice from the storm. It's next to impossible to come up with precise measurements of sleet versus freezing rain, although it seems obvious that the predominant form was from freezing rain. I am going to go with 0.3" of sleet (0.09" liquid) and 0.16" of freezing rain. The final few hours on either side of midnight were a "heavy" freezing drizzle. It looked like the tiniest snowflakes floating and flying around, but it wasn't snow. This precipitation brings my YTD total to 34.57" which represents an annual deficit of approximately 13.5" compared to the normal annual average of 48", which is the total I recorded during last year. I'll have the final yearly total after our last precip event coming up tomorrow evening into Monday afternoon.

I know the feeling. Once again, my sister back in north-central NJ (near Morristown), hits the snow jackpot. Mt Holly has them picking up 5-9", the highest total anywhere in Mt. Holly's CWA. Meanwhile around here...the mixtures continue. Temp has risen a tad now up to 28.6 degrees with a dew point of 25 and a wet bulb of 27.3. That means there is still some room left to drop back again if I can get some heavy stuff going for a while. The latest update from CTP for the Carlisle area has the main part of this storm winding down in about 3 hours with very little additional the rest of the night.

Here in Carlisle, at 2:30pm, there continues to be a mix of very light freezing rain mixed with sleet. Every time the intensity picks up the precip quickly becomes mostly sleet. Temp currently is down to 28.4 degrees with a rising dew point now up to 22. Several hours ago the dew point was 15, so wet-bulbing definitely exerting its influence. The total liquid equivalent is estimated to be around 0.03" with a hint of glaze progressively appearing. Definitely anxious to see if the HRRR's predictions come true.

I'm pretty sure @WmsptWxwasn't talking about the cold air for tomorrow's storm. He was talking about the strength of the cold air coming in on Monday behind the arctic front. The intensity of the cold post-frontal has been progressively weakening over the last few days. I can see how you could easily confuse the reference between the cold of tomorrow's storm versus Monday's cold.

In Carlisle, around 10:15am, the temperature is 34.3 degrees. Overnight I recorded just a trace of snow. Mulchy areas were white, however most all other areas were wet. Clearly the "action" was east of here towards Lebanon and Lancaster counties. I'll be watching the models to see how the Friday storm develops. With freezing rain events I often stay below 32 while points east and south warm up sooner. It's hard to believe that just 24 hours ago my forecast high temp for Friday was 57 degrees. This morning my forecast now is for a high temp of 32 degrees on Friday with early snow eventually changing to freezing rain. Still too early for anything definitive on Friday. Again, an interesting point is the farther northeast you go from south central, the longer the precip remains snow because that area is closer to the cold air source.

Good morning from Carlisle, where it is white and very cold. Fresh snowfall (albeit very light) combined with no wind and clear skies provided ideal radiational cooling overnight which allowed my temperature to drop all the way down to +3.4 degrees F, the coldest of the season thus far. That inch of snow that fell yesterday afternoon was just enough to radiate down into the single digits. Having read through all the morning posts it looks like many of us dropped below 10 degrees overnight. And, my prediction from last night regarding THV came true. I said I thought York would drop to zero, and they did, hitting -1 F.

Amazing what just a 1" coating of fresh snow can do if the skies can clear with very little to no wind. At 12:30am I'm down to 11.1 degrees and continuing to drop. I think that anyone with several inches of solid snowpack will find their temps in the single digits come dawn. I'll bet THV makes it down to zero. Last week my coldest reading was +6.6 degrees F. I think that's breakable. We'll see... Also, I melted down my snowfall, however I missed probably half of the accumulation because I didn't have my gauge outside on my board. I recorded somewhere between 0.8" and 1.0" of snowfall, but all of that only melted down to 0.01" of liquid! So, if you want to go with 80 : 1 SLR, I guess we can...lol. There's no doubt this snow was high ratio, however, I think the highest ratio I've ever officially recorded was around 30:1.

Near 7:00pm the temp is holding near 21 degrees. The snow flurries/showers is still continuing. That makes 3 hours with it still snowing, just very light. My meltdown will be forethcoming.

At 5:20pm it continues to snow lightly, but no longer accumulating. Just mood flakes...except I can't see them anymore...lol. I measured 0.8" in total new snow. Temperature has leveled off at 19.8 degrees. I love how crystalline the new snow is when it falls at these cold temperatures. My flashlight was reflecting back from the snow. I'll go melt the snow down once it has 100% ended. Perhaps it will be upwards of 15:1? We'll see.

Beginning to lighten up, but 0.5" of new snow here. Temp 19.9 degrees. Glad it hit while still daylight.

At 4:23pm here in Carlisle it is unexpectedly snowing moderately and probably at a rate that exceeds anything I had 2 nights ago. It's beginning to approach heavy as the flake size is increasing. I've picked up 0.3" of snow already and my temperature has dropped from 23 down to 20.3 degrees. I love snow when temps are this cold or colder because it instantly sticks to everything. I haven't looked at radar yet to see how widespread this is, but it remains solidly dark off to my west. What a surprise.