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April 2019 General Discussions & Observations Thread


bluewave
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8 hours ago, Rtd208 said:

Looks like the models (NAM/GFS) have been trending a bit wetter for today (Friday) into Saturday. Mt.Holly also was concerned for heavy rain especially Friday night into Saturday morning with thunderstorms also possible. Looks like more heavy rain/storms will be possible later Sunday, Sunday night and into the first half of Monday.

 

7 hours ago, NycStormChaser said:

Was just looking at that on the models. We might get some thunderstorms around 11pm tomorrow. Training cells are also possible leading to flash flooding. 

Yeah, PWATS are forecast to be near record levels for mid-April Friday night. Forecast soundings have training of heavy elevated convection potential. Would be nice to see a rainfall event overperform  for a change with how dry it has been recently.

https://www.spc.noaa.gov/exper/soundingclimo/

AB95A71A-5AEA-4136-A9C6-88CFF6FE2671.png.8c55967bc6842ca3d1bd664e27ef57ad.png

 

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29 minutes ago, gravitylover said:

What dry? We got absolutely drenched up here on Tuesday afternoon. It poured for a while.

Less than .50 of rain here over the last 2 weeks. It was the driest 3-29 to 4-11 since 2000 for FRG. Only 2.05 for March compared to the 3.82 normal.

1 2019-04-11 0.43 0
2 2015-04-11 0.44 0
3 2011-04-11 0.52 0
4 2018-04-11 0.57 0
5 2013-04-11 0.58 1
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Yeah felt pretty warm here in lower Manhattan. Got more breaks of sun than anticipated. Had lunch by South St Seaport, no shade over there , took me by surprise how warm it felt. Wall st Heliport showing 65. Bx thermometer shows 60 though with that ENE wind. 55 at LGA.

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Mt.Holly and Upton ref tonight/tomorrow and Sunday/Monday.

Mt.Holly:

 

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... 
   
  330 PM...A warm front associated with a deep low across the 
  Great Lakes is currently moving north through the area with a 
  trailing cold front well to the west over the Ohio Valley. Some 
  showers associated with weak shortwave energy currently moving 
  across portions of eastern PA and the Delmarva and expect these 
  to affect the I-95 corridor within the next couple hours as  
  they move east. However no thunder with this as the instability  
  remains off to the south and west.  
   
  Heading into this evening, above mentioned area of showers will 
  continue to affect the area as it moves east across NJ. Forecast 
  models generally have these diminishing with time however 
  guidance has not been handling this too well so far and this 
  warranted raising POPs into early this evening. Following this 
  first round of showers there should be a bit of a lull before 
  heavier showers and storms, now currently over western PA 
  southward into Virginia, move in by the late evening and 
  overnight. We have concerns for heavy rainfall with this second 
  round of showers and embedded storms. PWATs should rise to 1.5 
  inches in the warm sector as moisture is drawn northward with a 
  few hundred j/kg of elevated CAPE being shown by models. Also, 
  the south/east progression of the front should slow down with 
  the mean flow running nearly parallel to it. So for these 
  reasons not only will heavy rainfall be a concern but also the 
  potential for training of heavier shower/storms in a SW to NE 
  orientation. So this all said, urban and and small stream type  
  flooding looks to still be a threat overnight as localized  
  rainfall amounts of 1-2 inches will be possible within just a  
  few hours. Even some potential for localized flash flooding as  
  WPC has added parts of eastern PA into a marginal excessive  
  rainfall threat. Highest threat area looks to be along and N/W  
  of the I-95 corridor. Temperatures will remain quite mild  
  overnight and even a bit humid in the warm sector as lows will  
  be mostly in the upper 50s to low 60s.  
   
  && 
   
  .SHORT TERM /6 AM SATURDAY MORNING THROUGH 6 PM SATURDAY/... 
   
  Weak front oriented SW to NE will be draped across eastern PA to 
  start the day with ongoing showers ahead of it along and S/E of 
  the I-95 corridor. Some of these may continue to be heavy. The 
  good news is showers and any left over storms will taper off 
  through the morning from west to east with the passage of 
  shortwave energy aloft. Beyond this time weak ridging aloft will 
  temporarily move in for the afternoon with some mid level 
  drying also occuring. For this reason expect threat for showers 
  to continue diminishing in the afternoon with any activity  
  being isolated over the southern Delmarva. Otherwise, some sun  
  develops with most areas once again seeing highs in the 70s as  
  front dissipates over the area.  
   
  && 
   
  .LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/... 
   
  The highlight of the long term forecast will be the strong storm  
  system expected to affect the east coast Sunday night into Monday  
  morning. 
   
  The cold front that will stall across the southern portion of the  
  forecast area is expected to lift back northward as a warm front  
  overnight Saturday as an area of low pressure moves across the  
  Midwest region, and continue to slowly lift across the area during  
  the day Sunday. This may be a slow process with how fast this front  
  lifts across the area, but with increasing moisture and lift  
  associate with several short waves riding over the frontal boundary,  
  there will be a chance of showers Saturday night through Sunday.  
   
  As mentioned before, the main concern with the forecast is overnight  
  Sunday into Monday morning. As the low pressure moves into the  
  northeastern states overnight Sunday, a secondary warm front may  
  move across the area, before a cold front follows behind it. As the  
  warm front lifts across the area, PW values increase across the area  
  to 1.50-1.75 inches. Enhanced lift associated with additional short  
  waves/vorticity impulses overriding the warm front will likely lead  
  to a period of moderate to heavy rainfall. There is not a  
  significant amount of instability forecast at this time, however,  
  there could be enough to help lead to areas of convection, which may  
  lead to additional enhancement of heavy rainfall. At least poor  
  drainage flooding is possible with any heavy rainfall. If any  
  thunderstorms do develop, there could also produce some strong/gusty  
  winds as well. 
   
  There is also a non-zero severe weather threat with any  
  stronger/deeper convection that develops late Sunday night and early  
  Monday morning just ahead of the cold front. Lower and upper level  
  kinematics will be supportive of strong storms, if (and that is a  
  big if), enough instability is available ahead of the front. Low  
  level (boundary layer) thermodynamics appear to be the biggest  
  question mark at this point for any severe potential. This will need  
  to be monitored in future forecast updates.

Upton:

 

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
A warm front lifts north of the Lower Hud Valley and Southern
CT this evening. Breezy southerly winds likely in its wake and
ahead of approaching frontal system for NYC metro/LI/CT late
this afternoon into tonight.

Deep closed low approaching Lake Superior this evening will
move east northeast through southern Ontario and then into
northern Quebec this weekend. Ahead of it, an axis of southern
stream shortwave energy will lift through the region tonight,
with a weak frontal boundary pushing into the region tonight and
then southeast late tonight into Saturday morning. Deep layered
lift of a +2-3 std PWAT subtropical moisture plume, with
marginal elevated instability, converging ahead of a an
approaching surface trough, will bring a band of heavy rain and
perhaps a few embedded tstms to the region tonight. Operational
and high- res guidance indicating a likely 1/2 to 1 inches of
rain for most of the region, with potentially 1 to 1 1/2 inches,
most falling in 6 hours. Heaviest period of rainfall appears to
translate from west to east between 11pm and 6am. See Hydrology
section for associated impacts.

&&

.SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/...
Deep closed low continues to move east northeast through Quebec
and into the Canadian maritimes this weekend. At the surface,
the frontal boundary pushes se of the region Saturday morning.
With upper energy still well off to the NW and deep SW flow
aligned with the front, the showers could be stubborn to push
east of LI/CT in the morning, and even moreso the mid cloud
deck through the afternoon. This make for a challenging temp
forecast for Saturday. With afternoon clearing, temps could soar
well into the 70s to around 80 degrees across NE NJ, Lower Hud
and interior SW CT. Across se portions of the region and south
coastal areas, temps will likely remain in the lower 60s with
cloud cover and onshore component to flow.

A cold front then slips south through the area Saturday Night,
with Canadian maritimes airmass working into the region. A
strong low-level inversion and saturation under it could result
in some stratus formation Sat Night. If stratus doesn`t form
radiative cooling could lead to locally dense fog fomation.

&&

.LONG TERM /SUNDAY THROUGH FRIDAY/...
Warm front remains to the south of us for probably most of the
daytime on Sunday as the parent low remains well off to the west and
a LLJ doesn`t really get going here until the evening hours. Have
therefore sided closer to the cooler MET MOS guidance on an easterly
wind flow. Can`t rule out a shower at any point in the day, but
thinking is that better chances would occur in the afternoon with
the approach of stronger isentropic lift ahead of the warm front.

Low pressure center then heads from the eastern Great Lakes towards
the Northeast. This, along with a strengthening LLJ shifting in over
here, allows the warm front to move through. Deepening moisture,
convergence and lift will lead to a widespread rainfall across the
area. Elevated instability and wind shear allow for a chance of
strong thunderstorms, and with PWATs increasing to 1.5 inches - near
the record daily max for this time of year, rainfall will be
moderate to potentially locally heavy. Flash flooding potential at
this point is somewhat uncertain. Part of this depends on how much
rain we`ll get tonight into Saturday. Even without tonight`s
rainfall there`s potential for at least widespread minor flooding.
Rising dewpoints advecting over the cold area waters could aid in
fog development, especially in the vicinity of the warm front.

As the storm center moves into New England on Monday, its cold front
passes through sometime in the morning to midday hours with rain
chances dropping off behind its passage. Instability and shear ahead
of the cold front maintain a chance of strong thunderstorms.
Sufficient moisture and shortwave lift then remain during the rest
of the day to continue the threat of additional showers.
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Latest discussion from Upton regarding Sunday night into Monday morning:

Quote

Low pressure center then heads from the eastern Great Lakes towards
the Northeast. This, along with a strengthening LLJ shifting in over
here, allows the warm front to move through. Deepening moisture,
convergence and lift will lead to a widespread rainfall across the
area. Elevated instability and wind shear allow for a chance of
strong thunderstorms, and with PWATs increasing to 1.5 inches - near
the record daily max for this time of year, rainfall will be
moderate to potentially locally heavy. Flash flooding potential at
this point is somewhat uncertain. Part of this depends on how much
rain we`ll get tonight into Saturday. Even without tonight`s
rainfall there`s potential for at least widespread minor flooding.
Rising dewpoints advecting over the cold area waters could aid in
fog development, especially in the vicinity of the warm front.

 

 

And Mount Holly:

Quote

As mentioned before, the main concern with the forecast is overnight
Sunday into Monday morning. As the low pressure moves into the
northeastern states overnight Sunday, a secondary warm front may
move across the area, before a cold front follows behind it. As the
warm front lifts across the area, PW values increase across the area
to 1.50-1.75 inches. Enhanced lift associated with additional short
waves/vorticity impulses overriding the warm front will likely lead
to a period of moderate to heavy rainfall. There is not a
significant amount of instability forecast at this time, however,
there could be enough to help lead to areas of convection, which may
lead to additional enhancement of heavy rainfall. At least poor
drainage flooding is possible with any heavy rainfall. If any
thunderstorms do develop, there could also produce some strong/gusty
winds as well.

There is also a non-zero severe weather threat with any
stronger/deeper convection that develops late Sunday night and early
Monday morning just ahead of the cold front. Lower and upper level
kinematics will be supportive of strong storms, if (and that is a
big if), enough instability is available ahead of the front. Low
level (boundary layer) thermodynamics appear to be the biggest
question mark at this point for any severe potential. This will need
to be monitored in future forecast updates.

The cold front is forecast to make its way into the area around
daybreak Monday, then a secondary front/surface trough will likely
cross the area during the day Monday. The heavier showers will
likely be continuing through the morning hours Monday then move
offshore as the initial cold front moves off the coast. As the
secondary front/surface trough moves across the area during the day,
additional showers will be possible. As the winds turn west to
northwesterly, they will become gusty during the afternoon hours,
with gusts reaching at least 35 mph, with potentially higher peak
gusts. Maximum winds and gusts are currently forecast to occur
around dusk on Monday.

 

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Record warm minimum so far of 61 at Newark for today. So temperatures will be off to the races once we get some breaks of sun. It’s only been one year since we set the previous record of 58 degrees.

https://www.wrh.noaa.gov/mesowest/getobext.php?sid=KEWR&table=1&num=168&banner=off

Newark record warmest minimum for 4/13

4/13 58 in 2018 58 in 1977 57 in 2006

 

 

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1 hour ago, Brian5671 said:

About .75 here.  Things will really start "Waking up" vegetation wise with the weekend's warmth and rain.

Definitely, the undergrowth is getting thicker and greener.  Seems a little behind on the leaf out here though, considering it's mid-April. 

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2 hours ago, bluewave said:

Record warm minimum so far of 61 at Newark for today. So temperatures will be off to the races once we get some breaks of sun. It’s only been one year since we set the previous record of 58 degrees.

https://www.wrh.noaa.gov/mesowest/getobext.php?sid=KEWR&table=1&num=168&banner=off

Newark record warmest minimum for 4/13

4/13 58 in 2018 58 in 1977 57 in 2006

 

 

I'm already over 60 here in Mahopac.

48 minutes ago, SACRUS said:

Sun by noon

 

vis_nj_anim.gif

 

sat_23.gif

Sun is popping here now.

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