CarlislePaWx

Well, looks like I was correct with my comments about waking up to a "white" morning. My temperature hovered near 32.2 from midnight until 5:41am when it hit 32.5. It didn't go above 32.5 until 8:13am when it hit 32.7. Needless to say very little has melted. However, there is plenty of fog around this morning, and I have reached the warmest temperature it has been here in nearly 4 days, with a reading of 34.3 degrees. I don't mind the snow melting from purely warmer temperatures. But, I always hate to see snowpack eliminated by rain. It will be interesting to see how long it takes to melt the majority probably late this afternoon or evening.

I think I'm (we're) going to get my wish. The back edge of the rain is already crossing the M/D line. There is nothing behind following. My temp has fallen back to 31.8 degrees. At this point I'm guessing that there will be at most 0.10" of rain with the temp between 32 and 33. If the rain is done while the temp is 33, there absolutely will be snow on the ground in the morning. Even if the temp goes up to 35, with no sun and no rain, any melting will be curtailed. I'm dreaming of a white Monday morning...

Here is my climatological summary from Carlisle for 12/15/24: A total of 1.5" of snow was recorded between 4:00pm and 11:00pm. The 1.5" of snow melted down to 0.15" of liquid which gave a perfect 10:1 SLR. The high temp was 32.5 degrees and the low was 21.9. At midnight a very light mixture of snow/sleet/and maybe some rain was occurring. Maybe we'll be lucky and the amount of rain overnight will be less, and there will still be at least some snow left on the grass come 8:00am. Nite all.

At 9:15pm here in Carlisle, the temperature is holding at 31.6 degrees. Since the last obs it has snowed on and off lightly. At the moment the snow is the really fine stuff that almost looks like drizzle. However, it did snow enough to accumulate an additional 0.1" which brings the storm total to 1.5". This probably will end up being the final total if current radar trends are accurate. Wunderground radar is showing what looks like a change in p-type (sleet) might not be too far off. It shows pink coming north from Adams County and into southern Cumberland. All in all the snow season has officially begun and for the moment everything outside is covered in white. I'll discontinue my hourly updates for now and be back shortly after midnight with the climate summary for today.

At 8:00pm here in Carlisle, the temperature has risen to 31.5 degrees. Steady, light snow has returned. During the past hour an additional 0.1" of snow has accumulated, producing a storm total of 1.4". The current radar doesn't look as favorable as it did an hour ago for any meaningful additional accumulation. Will see where things stand in an hour. At least the precip has remained all snow with no mixing except at the very beginning.

At 7:00pm here in Carlisle, the temperature has risen to 31.1 degrees after having spent the majority of the hour at 30.7. The rise is because a lull in the accumulating snow has moved in. During the past hour only 0.1" of new snow has fallen. This has produced a storm total of 1.3". The HRRR seems to indicate some additional accumulations are possible over the next 2-3 hours before it stops completely for an hour and then resumes as rain by midnight. We'll see.

At 6:00pm here in Carlisle it is snowing moderately with fatter flakes reappearing. The temperature has risen from 30.0 2 hours ago to 30.9 degrees. At 5:00 I had recorded 0.9" of snow for the storm total. As of 6:00 an additional 0.3" has accumulated, producing a storm total of 1.2". The models that had been insistent on there being accumulating snow as far east as MDT have turned out to be the winners. CTP played catch-up again. Remember, the HRRR from this morning was showing a radar depiction of heavy snow over nearly all of our region at 7:00pm. Should be interesting to see what happens in the next several hours.

Back to smaller, "regular" size flakes (which is moderate 0.5"/hr rates). Temp down to 30.2 now.

Moderate to almost heavy with huge flakes now. Temp has dropped to what I thought it would earlier which is 30.4 with dew point of 28. It appears to be accumulating faster on my grass than on my snowboard. Grass easily reaching 1" with < 0.5" on the board. Too bad we're losing our daylight.

As of 1:15pm precip has finally started. It's a mixture of snow and sleet, but light intensity. Temp holding at 31.5 degrees with a dew point of 24 degrees. Wet bulb has risen one degree to 29 degrees. I'd say evaporational cooling potential is now up to 30 degrees.

31/23 here. Nothing yet despite solid radar snow echoes. Wet bulb is 28 degrees, so once the precip gets going good, the potential to drop to 29 is here. After the pressure hovered around 30.70" all morning it has now started a steady descent and is down to 30.63". In the climate section of last night's CTP disco they mentioned some historical pressure readings from MDT. Yesterday's max reading at MDT got up to 30.97", which was 0.02" of tying the monthly December record of 30.99" which was set back on December 25th, 1949. The all-time highest pressure recorded at MDT still stands at 31.09" I'd like to find out when was the last time MDT reached 30.90" or higher. I think it's been many years.

Wow! You literally took the words out of my mouth. Those same 3 counties seem to be headed into the WWA by morning. I continue to be amazed at the persistence of the high pressure not giving up the ghost. It's been holding steady all evening hovering around 30.80" after briefly rising to 30.82" an hour ago. Skies at 11pm are still mostly clear with only a few patches of cirrus floating by. I'm down to 19 degrees. I wonder if the overcast will be here by sunrise? The nearly full moon is directly overhead with what looks like a bright planet close by. The widespread frost that is already on the grass is reflecting the moonlight in crystalline fashion. Finally, my high temp today was actually lower than yesterday, which was a bit of a surprise. 32.4 degrees for my high today with yesterday's being 32.9...so basically the same. Both highs occurred between 2:24 - 2:28pm My low overnight (early) was 16.9. The first half of this month is definitely running quite a bit below average.

Ahhh...I'm back in the blue...lol. Actually, closer to 2.5". I'm the next county south for the expanded WWA...IF they expand it! Pressure holding steady now at 30.81". I'll just keep saying watch out for unexpected (prolonged) freezing rain in the advisory areas. I'm down to 26 with a dew point of 17.

I was overcast during the night until late morning. Now it's sunny with hardly any clouds. Temp is up to 30.7, very similar to yesterday at this time. Finally, like you, the pressure has now begun its slow descent and is currently 30.85".

Guys, I'm surprised no one has mentioned the current barometric pressure. Here at the moment it is 30.91" or 1047 millibars! This is the highest pressure I've seen in years. At the very least I know we never got this high during all of last winter. One very interesting thing is that frequently in these types of setups where very high pressure (usually closer to 30.70") is present, and precip is forecast to arrive approximately 24 hours later, freezing rain is oftentimes the predominant p-type. For me, this area is usually the last to give up the cold when there is cold air damming. I cannot speak as to how much snow I might see since I am literally 1 mile south of I-81, but when it does go over to rain, there may be a prolonged period of freezing rain. (Everything I have just talked about is referencing my location of central Cumberland county.)

Rain of varying intensities overnight and this morning. Since midnight 0.84" of precip. Yesterday saw 0.11" and Monday saw 0.31" for a 3-day storm total so far of 1.26". Temp has remained stable, but has very slowly risen from a low of 47.1 degrees at midnight to a high of the current 50.7 degrees shortly before noon. Pressure has been falling at nearly 1 mb / hr and is now down to 29.54". Another event with a sub-1000mb pressure about to be recorded.

At 1:00pm the sun is shining brightly, but it's a bit windy with steady 8-13 mph. However, the chill is not that terrible since the temperature has just reached 57.6 degrees. With no clouds to hold it back I think 60 is at least a possibility around here.

Make that a trifecta...low here this morning of 13.6 degrees at 5:32am. Also, coldest temperature for the month of November occurred at 11:54pm last night at 16.3 degrees. Warmest temperature for the month of November was 80.6 degrees on the 6th.

76.5 degrees here at 2:15. This time of the year my sensors spend more and more time in the shade. However, the mid afternoon period still gets full sun, if only for a few hours. I think 80 is doable here before 4:30. Also, now almost looks certain that I will have my driest month on record at 0.42", eclipsing the 0.63" from December 1988.

A frosty low of 29.3 here this morning, tying @Itstrainingtime. This was my first temp below 30.0 degrees this season. It also was the third sub-freezing low of the month, the others being 31.6 yesterday morning, and 31.8 back on the 17th. >>I've only recorded 0.42" of rainfall this month. If there is nothing for the rest of the month, this will be the driest month I have ever recorded since I began keeping precip records back in 1987 in NJ. The previous driest month on record has stood for 36 years and was recorded in December of 1988 with a total of 0.63". That was a frigid month and a very dry month. All of the precip that fell that month (what little there was) was in the form of snow. The only liquid precip was recorded beginning around 8:00pm on the 31st when a snow to rain event took place. I was four hours short of recording my first month where all recorded precip was frozen.

Low this morning was 36.9 at 3:45 am. Then some wind came in and ruined the radiational cooling. Not quite low enough to verify the Frost Advisory. A couple more nights to try again over the next 3 days before the warmup.

Me too. At the moment YTD is 33.99", so 6.01" to hit 40". Had an additional 0.20" overnight bringing MTD to 5.15". That's 3 times the amount of rain that fell during the entire month of July!

After paying Rouz a visit, Debby literally passes directly over me around 2:30pm Friday afternoon.

August is off to a rip-roaring start with rainfall. Rainfall since midnight: 0.16" Rainfall Yesterday: 2.73" Rainfall month-to-date: 4.93" Rainfall Year-to-date: 33.77", which is more than 10" ahead of last year at the same time with 23.5". Yesterday's rainfall came with two different thunderstorms. The first occurred between 5:30 and 7:00pm with 1.70". The second one was the most intense one with 1.03" falling between 9:45 and 10:30pm. The latest NHC cone for Debby has her passing directly over south-central PA Friday afternoon. I think I'll easily pick up another 5" between now and Saturday morning, making this month a 10"+. Someone mentioned a 10 inch event back in 2018. I'm pretty sure I had between 9.5" and 10.5", but I thought the month was September? Then, the most dramatic 10"+ month before that was back in June of 2011 when I picked up close to 10" in just one day! That one is my #1 greatest precip day (24 hours) of my lifetime. I'll drop in with more updates as we progress to Friday.

High temp exactly 100.0 degrees about 45 minutes ago (4:15), then some clouds came in and sent the temp back down to 98.6. The sun's been back for awhile but temp is very slow to respond. Only back up to 99.0. I'm leaning towards not exceeding 100.0 again today. I think it's been a few years at least since I last recorded 100. Before today I had reached 98-99 on at least 4 or 5 days so far this summer. Sun's still out but temp drop to 98.2.