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September Discobs 2021


George BM
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  • George BM changed the title to September Discobs 2021
16 hours ago, VirgilCain said:

Question - Looking at Sterling through radarscope - Are those migrating birds?

radar.jpg

Hard to tell from a still image.  "Clear air" echoes can be a variety of things, with bugs probably being the top culprit.  The radar wavelength that the NWS radar are at (S-band, 10cm) are also sensitive to Bragg scattering from atmospheric eddies.  At times, the radar beam can also be reflected back to the surface (anomalous propagation).

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21 hours ago, MN Transplant said:

Hard to tell from a still image.  "Clear air" echoes can be a variety of things, with bugs probably being the top culprit.  The radar wavelength that the NWS radar are at (S-band, 10cm) are also sensitive to Bragg scattering from atmospheric eddies.  At times, the radar beam can also be reflected back to the surface (anomalous propagation).

Thanks for the explanation! I've read that radar sites along the flyways often catch the movement at night during the spring and autumn migrations, but I wasn't sure if that's what I was looking at. 

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2 hours ago, yoda said:

Ugh... looks like warm and humid temps for the next 7-10 days... 85-90 and DPs in the 60s are just ugly in mid September

Exactly, looks aweful ! 

September should be another August. Climo is getting warmer and warmer right before our eyes. 

 

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Anyone else just hear what sounded like a large rumble of thunder?  No t-storms in our general area.  Checked out the Real Time Lightning map and there was a lone strike up near Gaithersburg, yet there's nothing on radar at all around here.  Very strange.  And no, I'm not hallucinating.  Am up working on a report for work without any IPA induced altered state.  

 

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MLLRs are just a WEE bit on the steep side this morning.

steepMLLRs.gif.02d32ffe8ce8b44b23a847d70376576f.gif

Now if it were two months earlier with a stronger sun-angle resulting in steeper LLLRs w/ sufficient lower-level moisture and there was a thunderstorm complex dropping southeast into the region, especially during a favorable time of day, then.....

 

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2 hours ago, George BM said:

MLLRs are just a WEE bit on the steep side this morning.

steepMLLRs.gif.02d32ffe8ce8b44b23a847d70376576f.gif

Now if it were two months earlier with a stronger sun-angle resulting in steeper LLLRs w/ sufficient lower-level moisture and there was a thunderstorm complex dropping southeast into the region, especially during a favorable time of day, then.....

 

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
945 AM EDT Mon Sep 13 2021

.SYNOPSIS...
High pressure will remain anchored offshore through much of the
week. A backdoor cold front will approach from Pennsylvania tonight,
then retreat northward as a warm front Tuesday. Low pressure may
develop near the Carolina coast Thursday into Friday as a weakening
cold front approaches from the Great Lakes.

&&

.NEAR TERM /THROUGH TONIGHT/...
Moderately to heavy dense smoke aloft will obscure skies today
per latest HRRR vertically integrated smoke output. This will
continue to impact sfc temperatures today and have undercut
guidance for high temperatures today. Used the 10th percentile
from the NBM. A strong elevated mixed layer with 700 mb temps
near 13C was seen on the 13/12Z and 13/00Z IAD upper air
launches, as well as on the 0555Z NUCAPS pass just offshore.
Nearly 9 C/km in the elevated mixed layer is not a very common
observation over the eastern U.S. However, the warmer low-levels
will inhibit surface-based convection with 107 degrees
temperatures necessary to achieve this.
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