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November Discobs 2020


George BM
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9 hours ago, MN Transplant said:

You know my neighborhood a bit.  The elevation change from the water tower down to the WO&D is 100'.  On the clear/calm nights without cold air advection there is cold air drainage and I just can't get that low.  Could be worth at least 3 degrees over about a block.  That's why to always be wary of point measurements in heterogeneous terrain.

Pretty cool lidar elevation map from Fairfax Co.  https://lidar-fairfaxcountygis.opendata.arcgis.com/app/5d4d2187b01f4d62ba53787eea94496b

 

738670509_lidarelevation.thumb.jpg.e64babdc2c04af9d9a65a3f0564f951b.jpg

 

Great map - thanks for sharing.  Can really see the FFCO Waste Transfer Station stand out as the red blob near I66 and FFCO Pkwy.  That also happens to be the highest point in FFCO, with a close second being in Tyson's Corner at 123 and Intl Dr. 

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3 hours ago, psuhoffman said:

You can see the highest point from here on the next ridge over.  You could walk there it’s probably a little over a mile. About 75 feet higher than me. 

Is that up the Park Ave. Hill?   I has a paper route growing up which I had to ride my ten speed up that hill.  Fun times. 

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17 hours ago, toolsheds said:

Is that up the Park Ave. Hill?   I has a paper route growing up which I had to ride my ten speed up that hill.  Fun times. 

That’s the second highest peak. High point is just west of route 30 just south of the PA border north of Manchester. My house is on the summit of the 3rd highest peak in the area. 

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50 minutes ago, mdhokie said:

We do it so well! A couple of my neighbors blew their leaves into huge piles over the weekend. All their work has been reversed.:twister:

I dont get why people do this and expect the leaves to all stay there.  Street pickup needs to happen like the day of or day after.  

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13 minutes ago, H2O said:

I dont get why people do this and expect the leaves to all stay there.  Street pickup needs to happen like the day of or day after.  

Just remembering, H2O,  from my little guy days in the early fifties, folks with property, even in the city,  still swept leaves into piles for burning. A tradition, thankfully long gone, however the aroma of burning leaves as an announcement for Fall, still lingers. As always....

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1 hour ago, WinterWxLuvr said:

I don’t understand why people don’t just mow leaves. Easy solution

Fully agree - Gator blades quickly mince leaves into bits.  Stopped picking up leaves years ago.  Minced leaves are great for the trees and grass too. The only thing I use my tow behind Cyclone Rake for is to pickup the pesky pine needles, which kill the grass.   

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Anybody else watching the Sunday/Monday time period of next week?  Looks mighty interesting re severe chances and rain-wise... and maybe winds too... even LWX in their afternoon AFD have been highlighting it

A strong storm system will develop over the lower MS River valley
Sunday and deepen as it moves northeast into the western Great Lks
region. Ample Gulf moisture and strong wind fields will accompany
the associated frontal zone and may bring a variety of hazards from
possible severe wx, flooding, and strong post-frontal winds. There
is about a 12-hr difference in the timing of the frontal passage
through the local area between the ECMWF and GFS with the GFS being
faster. Both models depict a strong cyclone and associated cold
front with the Euro being stronger.

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LWX still hitting early next week hard in the AFD this morning:

The biggest concern for the long-term period is what may happen
Sunday into Monday. The upper-level pattern becomes very
complicated during this timeframe, with both the Polar and
Subtropical jet streams becoming quite active. This will feature
a piece of upper- level energy diving out of the Northern
Plains towards the eastern half of the country. Meanwhile,
another piece of energy, cut off from a previous trough that has
already moved off to the east, will be moving within the
southern branch of the jet stream through the Deep South. It is
expected that these two pieces of energy will interact with one
another in some form on Sunday/Monday, leading to the
development of a potentially potent surface low pressure system
over the southeast, which will then potentially move towards the
Mid- Atlantic. Right now, specific potentially hazardous
impacts look possible, but there are just too many details to
iron out to get into specifics at this juncture. In fact,
guidance is even pretty inconsistent on timing of the potential
system as well. So just know that this is on the horizon near
the end of the forecast period, and details on track and timing
will come better into focus in the coming days.

Whatever happens with this system this weekend into early next
week, ensemble guidance seems to be pretty confident in a shot
of much cooler air pushing in behind it into mid-week.

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