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E PA/NJ/DE Spring 2021 OBS Thread


Rtd208
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3 hours ago, KamuSnow said:

Wow - guess Birds~69 won't be over this afternoon. What kind of bush is that? Almost looks like a tree, looking above it and behind. 

Popped meds this morning. Wasn't horrible, lack of wind helped today. Still felt a bit loopy.

If I have wind/breeze and no rain then pollen is a mess and increased meds will turn me into a zombie. Then you need a flooding rain which will wash some pollen away. It's total crap either way...I'd rather have 15F and heavy freezing rain.

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Nearby is a long run of pine trees running east-west, on the north facing side a solid 20ft wide strip of snow for the length of a football field

Once had a stretch like them in Horsham and it was the last place to hold snow, pine make for the best sun block

 

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Received a red/tan coating yesterday w/only about 45mins in the direct sun. Going to hang outside this afternoon so I'll see what happens (thinking red) and the thought of BBQ'ing comes to mind but not sure. Allergies aren't bad at all surprisingly even w/o meds and the birds are chirping some Zeppelin tunes...

60F/super sunny, blue skies and a DP of 24F

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On 3/2/2021 at 11:31 PM, RedSky said:

Truth or rumor that JB thinks the second half of March into April is going to be a snow blitz :lol:

Any JB updates? I'm hesitant to put the Snowcat away incase I need it to off-road my way to Wine & Spirits during the upcoming blitz. 

63F, full sun :sun:

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Interesting read for today/tonight from Mt. Holly

.NEAR TERM /THROUGH TONIGHT/... 
  The lengthy stretch of dry weather comes to an end today.  
  Beautiful satellite imagery over the CONUS this morning as an  
  occluding mid- latitude cyclone slowly approaches the western  
  Great Lakes. Ahead of it lies an expansive frontal zone of cloud 
  cover with a large band of cold cloud tops observed on IR from  
  Canada to the Gulf of Mexico. Precipitation in most of this band 
  is limited and on the light side as of early this morning,  
  however. Meanwhile, a weak but pesky surface low which has sat  
  well to our south for days was observed on radar moving inland  
  over North Carolina overnight. The landfall was reminiscent of a 
  weak tropical cyclone moving ashore. FSU cyclone phase space  
  diagrams suggest it had at best a marginal and shallow warm core 
  at landfall, and a lack of any deep convection rendered it  
  firmly non-tropical. But it has a good envelope of higher  
  moisture air associated with it from the sub-tropics, and as the 
  day goes on it will begin to interact with the approaching  
  frontal zone. This combination will lead to the blossoming of an 
  area of showers which will bring a solid dose of rain to the  
  area.  
   
  Prior to the start of rainfall, we`ve seen low clouds fill in  
  over much of the area overnight as the low levels moisten  
  further in the continued light onshore flow regime. This trend  
  should continue into daybreak, and we should see more in the way 
  of fog develop as well. It is possible we could see some breaks 
  in the clouds during the mid morning hours as mixing begins and 
  before rain arrives, but this is uncertain and probably less  
  likely than not. As the day goes on, what remains of the low to  
  the south will become entrained in the slow moving frontal zone  
  and will move towards our region. Continuing a trend that has  
  been ongoing for at least 36 hours now, most model guidance  
  continues to trend higher on QPF for this event. There has  
  certainly been a trend higher in projected PWATs for today,  
  which appear poised to rise to 1.2 to 1.4 inches across the  
  region. Low level omega shows notable improvement over the area  
  today, especially this afternoon. There is also a somewhat  
  subtle ~95 kt upper jet streak which moves into New York state  
  this afternoon, adding a bit of divergence at the upper levels.  
  With this said, continuing the connections to tropical weather,  
  there are at least some loose parallels to a Predecessor Rain  
  Event (PRE) in play today with the rising PWATs and right  
  entrance jet dynamics, especially considering the actual center  
  of the compact low remains south of the region for most of the  
  day. While there is quite a bit of variation in the models, it  
  now appears many areas will pick up 0.5 to 1.0 inches of rain  
  today, with the potential for some localized higher amounts  
  especially over southeastern portions of the area near the low  
  center, and possibly over eastern PA with some orographic  
  enhancement as well as the better jet dynamics. The trends have  
  been a little slower on timing of rainfall, but showers should  
  overspread the region from southwest to northeast mainly between 
  9AM and 2PM. Lighter showers or drizzle are possible before the 
  arrival of steadier rain. Once the steadier rain arrives, it  
  should continue through at least most of the daylight hours,  
  possibly tapering off late in the day to the southwest. Given  
  the rising PWATs and respectable dynamics, some heavier  
  downpours are possible. So a wet day overall, especially this  
  afternoon. While the air mass remains on the warm side, the rain 
  and clouds will hold highs down in the mid to upper 50s in most 
  of the area. 
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7 minutes ago, RedSky said:

Trying to figure out how you get an all day heavy rainer that only two days ago was a 30% chance of scattered shower of .10-.25" 

 

The same way we picked up less than an inch last week when 2" was forecasted...delayed but not denied.

.25" so far, 53F

 

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2 hours ago, RedSky said:

Trying to figure out how you get an all day heavy rainer that only two days ago was a 30% chance of scattered shower of .10-.25" 

 

I'm thinking the same thing. I don't follow the models as closely in spring but it seems this heavy rain event came out of nowhere. Flat out pouring the last hour or two with no signs of letting up soon. Will probably finish easily over an inch of qpf. Wtf.

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Interesting discussion from Mt. Holly for both Friday and Sunday.

Model soundings suggest winds will be increasing in this regime, 
  readily gusting to 35+ mph by afternoon. As winds begin to veer, 
  diurnal mixing peaks, and a reinforcing cold front approaches 
  the area, speeds will likely exceed advisory criteria in much of 
  the area. Winds at 850 mb will be approaching 50 kt, and mixing 
  has the potential to reach or even exceed this level. Seems 
  likely we will need a wind advisory for Friday afternoon and 
  evening, and if mixing ends up being more efficient than 
  currently advertised, a rogue severe-caliber gust may occur. 
  Held off on issuing wind headlines early this morning given 
  ongoing/near-term weather, but expect wind products to be  
  issued for the afternoon package. 
   
  Winds should decrease fairly rapidly Friday night as the 
  migratory surface low takes the strong pressure gradient with it 
  to our northeast. Strong cold advection will be occurring in the 
  post-frontal regime, but winds will not entirely decouple. Thus, 
  kept Friday night lows fairly warm, generally in the 40s to 
  around 50. 
   
.LONG TERM /SUNDAY THROUGH WEDNESDAY/... 
  A fairly strong system will affect the region on Sunday, though 
  the surface cyclone should lift well north of the region. 
  Nevertheless, upper dynamics look fairly impressive as an  
  initially positively-tilted trough begins to pivot to a more  
  neutral tilt as it approaches the East Coast during the day. A  
  100+ kt speed max at 500 mb will nose into the Mid-Atlantic  
  during the afternoon, collocated with a surging cold front to  
  the south of the aforementioned surface low. As warm advection  
  races north in the developing warm sector, convection should  
  readily develop along the attendant warm/cold fronts. Widespread 
  precipitation should occur in New England and the Mid-Atlantic  
  in this setup, with areal QPF likely exceeding a half inch  
  across the CWA (locally much higher amounts possible). Will need 
  to watch this system closely, as both severe and hydro issues  
  may be present depending on the usual timing/track issues. 
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