Jump to content
  • Member Statistics

    19,022
    Total Members
    49,013
    Most Online
    loganboehmewx
    Newest Member
    loganboehmewx
    Joined

August 2020 General Discussions & Observations Thread


Rtd208

Recommended Posts

1 hour ago, wdrag said:

Good Tuesday morning all,  No topic from me this morning. Will re-evaluate late this afternoon and beyond but for now...

I see isolated strong northeastward moving storms, from I95 northwestward, 2P-10P, some with tiny areas of 1-2" rain, and even one or 2  that might produce a severe weather report but not a widespread event, as far as I can tell.

There should be  pretty decent band of thunderstorms across central NYS this evening that may die out in se NYS, w CT and extreme nw NJ overnight? 

Wednesday-Thursday and now via the 06z/11 GFS include Friday into early Saturday.  Not enough model consistency for me to as yet, if ever, target topic 4"+ rains and/or more than 2 severe reports.   However, not out of the question for parts of the I95 corridor northwestward, but just too early for me to express any confidence. Modeling has become a little timid in it's 00z/11 model cycle (06z/11 GFS differs considerably wetter).  Even the SPC HREF, noted for more easily identifying big rainfall, is relatively modest through Wednesday afternoon.

I'll probably be off line 8A-2P.   736A/11

I always look forward to your posts 

Link to comment
Share on other sites

  • Replies 1k
  • Created
  • Last Reply

83 and steamy 75.  Low clouds and fog burning off and it seems like we're off to the races.  More 90s today especially in the hotter spots. Tomorrow storms arrive at some point in the afternoon so a toss up day for potnetial 90s and reaching / extending the heatwave.

Ridge builds into the Rockies with WAR shifting towards east of Bermuda.    Plenty of storms around in a rather stagnant air mass Thu / Fri before onshore flow build around Sat (8/15) and Sun (8/16). 

 

Mon (8/17) and Tue (8/18) warmer but still looks like opporunity for showers and popups each day.  Cooler air looks likely Wed 8/19 - Thu (8/20) will be interesting to see the extent of the reach.

 

Beyond there longer range.  Rockies ridge and heat will move east into the Plains and MidWest and similar pattern will push heat into the area with the strongest heat liekly coming in 2 days spurts for a hot close to the month.

 

 

Link to comment
Share on other sites

On 8/10/2020 at 11:43 AM, Will - Rutgers said:

Too bad it's humid subtropical and not Mediterranean.

Wonder what kind of crops we'll be able to grow here in 20 years.

The development that my mom lives at in Bedminster have already been planting crape myrtle over the last couple of years. They seem to be thriving well.

Link to comment
Share on other sites

Good Tuesday afternoon everyone,

I saw the 1 SVR for the ne NJ coast.  Won't surprise at a nice line of vigorous convection drifting into the NYC forum coverage area after midnight and dying out vicinity NYC-LI at dawn Wednesday per the midday HRRR  Thereafter,  new convection late Wednesday along the front with uncertainty on amounts-placement late Wed-Sat.

The very wet GFS op of near 8" here by Monday seems to be far too wet as compared to the 12z/11 UK, GGEM, EC op runs. The GEFS/EPS ensembles are generally ~1" NYC.  So, showers and storms are coming, a little bit today, late tonight and more late Wed-Fri or Sat.  How much??  For now no topic. 

I see the heat wave may not make it, even for EWR?? 348P/11

Link to comment
Share on other sites

The EPS has a break in the 90° heat for a while after tomorrow. Plenty of onshore flow coming up with high pressure to the north and lows to the south. The actual rainfall will probably be determined in the short term by where the weak fronts set up.

 

97EBA3FF-2C35-48BB-91D8-240C7554C147.thumb.png.90b1edc1b6d9bb9ab287d7c3212643fd.png
43BF2479-1BFF-42F8-B217-C480495118C4.thumb.png.188aef7ccbb3a324b9280f70caf13656.png

Link to comment
Share on other sites

1 hour ago, bluewave said:

 Plenty of onshore flow coming up with high pressure to the north and lows to the south.

Do you think by day 10 we may start to see a couple days of NW flow,  versus the continuous Easterly/NE and SE flow depicted by the models? 

   

Link to comment
Share on other sites

The temperature rose mainly into the upper 80s across the region today. Tomorrow should be a similar day.

The current predominantly warmer than normal pattern will likely persist through much of September, paving the way for a solidly warmer than normal summer and a warm start to fall throughout the region. Occasional short-lived cool shots remain possible.  

The ENSO Region 1+2 anomaly was -1.2°C and the Region 3.4 anomaly was -0.6°C for the week centered around August 5. For the past six weeks, the ENSO Region 1+2 anomaly has averaged -1.15°C and the ENSO Region 3.4 anomaly has averaged -0.37°C. Neutral-cool conditions will likely into the start of autumn. During the autumn, La Niña conditions will likely develop.

The SOI was +8.44.

Today, the preliminary Arctic Oscillation (AO) figure was -0.627.

On August 10, the MJO was in Phase 5 at an amplitude of 0.796 (RMM). The August 9-adjusted amplitude was 1.259.

Some of the guidance suggests that the MJO could be in Phase 8 in late August. The convergence of the MJO's passage through phase 8 and revived tropical cyclone activity could suggest the possibility of an East Coast threat during the August 20-September 10 period. Phases 8-1-2 have coincided with a cluster of East Coast landfalls. Belle (1976) and Gloria (1985) made landfall when the MJO was in Phase 8 at a low amplitude. Sandy (2012) and Fay (2020) made landfall when the MJO was in Phase 2.

The MJO's recent passage through Phase 4 at an amplitude of 1.500 or above has been uncommon during the first half of August. During the 1981-2019 period only 1983 and 2019 saw the MJO move through Phase 4 with an amplitude of 1.500 or above during the first half of August. August 1983 had the longest such stretch. Both cases saw the second half of August average generally warmer than normal in the Middle Atlantic region. Both cases also featured a warmer than normal September.

Last year, the MJO went through a very strong passage through Phase 1 during the closing days of May. About four weeks later, a warmer than normal pattern locked in and predominated through early autumn. This year, the MJO was in Phase 1 for 3 consecutive days with an amplitude of 1.500 or above during the June 1-3 period.

Last year, the SOI fell to -42.04 on June 22 when the MJO was in Phase 6. This year, the SOI plunged below -46.68 on June 5, its lowest level in more than three years. The dramatic plunge in the SOI could be the proverbial spark that kicks off a sequence of events leading to the development of a sustained warmer than normal period. The cases that saw both the MJO and SOI thresholds satisfied generally saw 10-20 days where the temperature reached or exceeded 90° in New York City during the July 1-August 31 period.

Since 1990, there have been 11 La Niña events, 6 of which followed an El Niño winter. 10/11 (91%) case saw warmer than normal September. All 6 following an El Niño winter were warmer than normal. September mean temperatures for New York City for those cases were: 11 cases: 69.9°; Subset of 6 cases: 70.8°; Entire 1990-2019 period: 69.0°. The September mean temperature for all La Niña and neutral-cool cases following an El Niño winter (1950-2019: n=13) was 69.9°. Overall, the evolution of ENSO, along with the observed ongoing monthly warming (1.6°/decade in NYC and 1.5°/decade in the Northeast Region during September 1990-2019), favors a warmer than normal September.

Since 1950, there have been five cases where a La Niña developed during June-July-August or afterward following an El Niño winter. 4/5 (80%) of those cases saw a predominant EPO+/AO+ winter pattern. The most recent such case was 2016-17. 9/10 (90%) of the La Niña winters that followed an El Niño winter featured a predominantly positive EPO.   

Based on sensitivity analysis applied to the latest guidance, there is an implied 66% probability that New York City will have a warmer than normal August. August will likely finish with a mean temperature near 77.0°.

Link to comment
Share on other sites

On 8/10/2020 at 9:55 PM, uncle W said:

some 1800's snowstorms...

1857 

http://chroniclingam...-20/ed-1/seq-5/

1857...

http://chroniclingamerica.loc.gov/lccn/sn83030213/1857-01-20/ed-1/seq-5/

1867...

http://chroniclingamerica.loc.gov/lccn/sn83030214/1867-01-21/ed-1/seq-5/

1872 

http://chroniclingam...-27/ed-1/seq-1/

http://chroniclingam...-27/ed-1/seq-5/

http://chroniclingam...-27/ed-1/seq-1/

http://bklyn.newspapers.com/image/50352788

http://bklyn.newspapers.com/image/50352790

http://bklyn.newspapers.com/image/50352791

1869...snowstorm...

http://chroniclingamerica.loc.gov/lccn/sn83030272/1869-01-02/ed-1/seq-1/

http://chroniclingamerica.loc.gov/lccn/sn83030214/1869-01-02/ed-1/seq-8/

http://chroniclingamerica.loc.gov/lccn/sn83030313/1869-01-02/ed-1/seq-4/

1877...snowstorm...

http://chroniclingam...-03/ed-1/seq-1/

http://chroniclingam...-02/ed-1/seq-8/

http://bklyn.newspapers.com/image/60725875

http://chroniclingamerica.loc.gov/lccn/sn83030313/1877-01-03/ed-1/seq-6/

1859...16" of snow...

http://chroniclingamerica.loc.gov/lccn/sn83030313/1859-01-05/ed-1/seq-8/

1836 big snow...

http://chroniclingamerica.loc.gov/lccn/sn83030311/1836-01-11/ed-1/seq-2/

1879 foot of snow 

http://chroniclingam...-17/ed-1/seq-1/

http://chroniclingamerica.loc.gov/lccn/sn83030272/1879-01-17/ed-1/seq-3/

1867...

http://chroniclingamerica.loc.gov/lccn/sn83030214/1867-01-18/ed-1/seq-4/

1855 snowstorm...

http://chroniclingamerica.loc.gov/lccn/sn83030313/1855-02-10/ed-1/seq-1/

1897 

http://chroniclingam...-13/ed-1/seq-1/

1899......

http://fultonhistory...cale - 0816.pdf

http://chroniclingamerica.loc.gov/lccn/sn83030214/1899-02-13/ed-1/seq-1/

http://chroniclingamerica.loc.gov/lccn/sn83030214/1899-02-13/ed-1/seq-7/

1899...

http://chroniclingamerica.loc.gov/lccn/sn83030214/1899-02-14/ed-1/seq-1/

http://chroniclingamerica.loc.gov/lccn/sn83030214/1899-02-14/ed-1/seq-2/

http://chroniclingamerica.loc.gov/lccn/sn83030214/1899-02-14/ed-1/seq-3/

http://fultonhistory...cale - 0817.pdf

http://fultonhistory...cale - 0817.pdf

1867...

http://chroniclingamerica.loc.gov/lccn/sn83030214/1867-02-22/ed-1/seq-5/

http://chroniclingamerica.loc.gov/lccn/sn83030313/1867-02-22/ed-1/seq-4/

1894 storm 

http://chroniclingam...-27/ed-1/seq-1/

1894 

http://chroniclingam...-26/ed-1/seq-1/

1888

http://bklyn.newspap.../image/50437841

http://chroniclingam...-13/ed-1/seq-1/

http://chroniclingam...-13/ed-1/seq-1/

http://chroniclingam...-13/ed-1/seq-2/

http://chroniclingam...-13/ed-1/seq-3/

http://fultonhistory...cale - 0455.pdf

1896 

http://chroniclingam...-17/ed-1/seq-1/

http://bklyn.newspap.../image/50337497

1892 

http://chroniclingam...-19/ed-1/seq-5/

http://bklyn.newspap.../image/50461371

Thanks Uncle, this is a wealth of info!

On a note about a different kind of storm, the Perseids are really good tonight!  Around 11 PM I saw a few really bright ones that seemed to pass just over my house!  One really notable one that changed color from golden to red and after it streaked across really low I heard a sound, almost like the sound of a pebble hitting something?  Would that be a bolide?  How are the sky conditions over there?  I'm still in the Poconos for a couple more days.

 

Link to comment
Share on other sites

The next 8 days are averaging 80degs., or about 4degs. AN.

Month to date is +2.9[78.9].       Should be about +3.3[79.4] by the 20th.

78*(95%RH) here at 6am., scattered overcast.     80*(93%RH) by 9am, scuzzy looking.       82*(RH87%) by Noon. Oil

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...