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E PA/NJ/DE Winter 2024/25 Obs/Discussion


JTA66
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We picked up 0.23" of freezing rain and rain since last evening. So far this year we are running over 2.5" below normal rainfall. Over the last 14 months we have been running at a slight deficit of 4.90" of precipitation. During this time frame we are running at 91% of normal melted snow/rain. We should put a nice dent in our deficit over this weekend with most models showing upwards of 1" of rain. Tomorrow will be the best weather day of the weekend before snow arrives on Saturday afternoon. Snow will change to rain during the PM. Sunday looks wet through midday. We then turn sharply colder by Sunday night with yet another run of below normal temperatures for most of next week. We have had solidly below normal temperatures across the area since way back on Thanksgiving Day. Expect to hear rumors of a snowstorm by mid to late next week.

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Many of us have been burned with digesting the LR models now as gospel the last 30 days.  Even the SR models have been questionable as the parade of overrunning events  over extremely dry air masses and the the basic geography of the Blue Mts are destroying any chances of a nice snowstorm event in Eastern PA. To even see a 3-5 inch event for Saturday is IMHO  questionable the air as the conditions must be absolutely perfect for this to happen in this crappy pattern. I still have doubt on a 1-2 inch rain this weekend. most likely .50 to 1 ". 

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1 hour ago, Albedoman said:

Many of us have been burned with digesting the LR models now as gospel the last 30 days.  Even the SR models have been questionable as the parade of overrunning events  over extremely dry air masses and the the basic geography of the Blue Mts are destroying any chances of a nice snowstorm event in Eastern PA. To even see a 3-5 inch event for Saturday is IMHO  questionable the air as the conditions must be absolutely perfect for this to happen in this crappy pattern. I still have doubt on a 1-2 inch rain this weekend. most likely .50 to 1 ". 

I would venture to guess 90%+ of the posters here in our subforum don't take the long range models as gospel. This is in fact a weather forum: we post long range weather maps, track storms, and analyze ensemble guidance. When someone posts a 5+ day out map, it's assumed by most that it's exactly that... A weather-prediction model output with an attempt to simulate a chaotic, non-linear, dynamic fluid that we call the atmosphere. When the local Philly news outlets share long range guidance to the uninformed public? That's a problem and a whole other topic of discussion. Improving the communication of probabilities to the public, emergency managers, stakeholders, etc. is currently a huge area being tackled by the NWS. It's why there's been a big shift away from individual deterministic model evaluation and emphasis on in-house statistical ensemble products (NBM for example). In short, on a weather board like this I know most don't just take the models as gospel. The people on here are well-informed and knowledgeable about their stuff. We look at the long range models and scrutinize them because that's what we do and love.

Speaking of long-range guidance... I believe this winter has been quite favorable at the 500mb level for mid-Atlantic snowstorms. Parts of SE PA have not been impacted as much due to small nuances in the flow that don't show up until close to game time. Compared to last winters, this has been quite an improvement.

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9 minutes ago, Newman said:

I would venture to guess 90%+ of the posters here in our subforum don't take the long range models as gospel. This is in fact a weather forum: we post long range weather maps, track storms, and analyze ensemble guidance. When someone posts a 5+ day out map, it's assumed by most that it's exactly that... A weather-prediction model output with an attempt to simulate a chaotic, non-linear, dynamic fluid that we call the atmosphere. When the local Philly news outlets share long range guidance to the uninformed public? That's a problem and a whole other topic of discussion. Improving the communication of probabilities to the public, emergency managers, stakeholders, etc. is currently a huge area being tackled by the NWS. It's why there's been a big shift away from individual deterministic model evaluation and emphasis on in-house statistical ensemble products (NBM for example). In short, on a weather board like this I know most don't just take the models as gospel. The people on here are well-informed and knowledgeable about their stuff. We look at the long range models and scrutinize them because that's what we do and love.

Speaking of long-range guidance... I believe this winter has been quite favorable at the 500mb level for mid-Atlantic snowstorms. Parts of SE PA have not been impacted as much due to small nuances in the flow that don't show up until close to game time. Compared to last winters, this has been quite an improvement.

Agreed 100% I know most folks that post here understand that irrespective of what a model shows....we never ever need to shovel model snow. It is one part of the tool set used by professional meteorologists to make a forecast. Nothing wrong with posting maps as long as folks understand what they are and what they are not.

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25 minutes ago, RedSky said:

12z ECM with three swift groin kicks. Cuts Saturday snow to <1", cuts qpf for the storm to <1", misses to southeast I95 with next weeks storm.

Drought guy will be drooling

 

12z Euro ensembles strongly disagree with the OP. Ensemble mean of 4-6” for next week.

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