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Tropical Storm Debby: Mid-Atlantic Impacts


WxWatcher007
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36 minutes ago, nw baltimore wx said:

I’ll put this here since it’s Debby related, but two photos from my current vantage point atop Killington. First is looking north, and the second south.

image.jpeg.c0a37da283290060be5047a3aa802490.jpeg
 

image.jpeg.05f34659e17dc875ed90d43c37969ff0.jpeg
 

edit: and just as I post this, it starts raining.

Awesome. Guess it’s time to grab a drink now with the rain? :lol:

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Raining again at MRB.  Now at 5.35” in the past 48 hours there.  6.42” for August.

With the main show arriving tonight, it will be interesting to see how high up the list of wettest Augusts the total can reach less than 1/3 of the way through the month.

1955- 9.71”

1942- 8.86”

1954- 7.75”

2018- 7.32”

1978- 7.15”

1928- 7.05”

 

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11 minutes ago, stormy said:

The outer rainfall perimeter from Debby has been 5 - 10 miles southeast of my location for 3 hours!

Yup been watching that, didn't run into any rain till going up Afton on 250 going to work... Of course raining solidly in Cville...

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41 minutes ago, nw baltimore wx said:

So good to see you post! Hope all is well!

Thank you! Been good, busy. Hoping for more rain. 

39 minutes ago, dailylurker said:

Welcome back!

1.24" storm total so far. 

Thank you! Your crop looks great btw 

10 minutes ago, North Balti Zen said:

Woo! Nice to see you mappy. Some more rain on top of that up our ear will be most welcome. Things are trying to re-green…

Hi friend! Yes, nice to see more green than brown. Was a hot dry softball season until the last week or so. I missed the big heat wave in July though haha 

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26 minutes ago, Jrlg1181 said:

Yup been watching that, didn't run into any rain till going up Afton on 250 going to work... Of course raining solidly in Cville...

I think I have brainstormed the problem with a little help from the SPC. There has been a slight ridge wedging down the Valley from the northeast and discouraging rainfall moving in from the southeast.

It is breaking down and should allow significant periods of rain to move in during the next several hrs.

I have my fingers and toes crossed!!    First real shower gave me .06 during the past 20 minutes.

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A couple of the NC folks in the main thread- I don't get what their posting perspective is. Were they expecting to get more from a minimal TS than: 130,000 outages across the state at peak, numerous fallen trees, damaging tornados, flooded roads (e.g. below from a recent LSR), and major flood stage crests in multiple rivers across the state in a couple of days? 

Edited to add: Thanks @TSG for explaining that one of them is just always down on the NWS/NHC. 

0130 PM     Flash Flood      3 NE Rolesville         35.96N 78.43W
08/08/2024                   Wake               NC   Trained Spotter

            Many streams and creeks continue to flood
            and several roads remain flooded in northern
            Wake county. Water was across NC 98 between
            NC 96 and Moores Pond Road.

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Afternoon AFD from LWX - note it is long and very detailed 

 

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
402 PM EDT Thu Aug 8 2024

.SYNOPSIS...
The remnants of Debby will move through the area tonight into
Friday, before passing off toward our northeast on Friday night.
Thereafter, high pressure will build over the area into early
next week.

&&

.NEAR TERM /THROUGH FRIDAY/...
The latest NHC advisory shows Tropical Storm Debby centered
along the North Carolina/South Carolina border. Well off to our
northwest, a broad upper trough is centered over the Western
Great Lakes and Upper Midwest. Debby`s circulation is starting
to feel the influence of that trough well off to our northwest,
and is being drawn northward in response. As this interaction
with the upstream trough occurs, Debby will also start to turn
extratropical in nature. As we move forward in time, the
remnants of Debby will track northward through the Shenandoah
Valley tonight, before moving northward across Pennsylvania
tomorrow. The system should eventually reach upstate New York by
tomorrow evening. As the system tracks northward through our
area it will produce a number of weather hazards, which are
discussed more in-depth below...

Heavy Rainfall/Flooding: Current radar imagery shows numerous
showers/downpours ongoing in advance of Debby`s main circulation
across northern Virginia, Maryland, and the West Virginia
Panhandle. These heavier showers are occurring within a
warm/moist advection regime ahead of Debby, and are producing
very heavy rainfall for brief periods of time. Due to the rather
disorganized nature and brief duration of these showers,
flooding isn`t anticipated. However, they may lead to brief
reduced visibility, or some ponding on roadways.

The main precipitation shield associated with Debby is just
starting to work into central Virginia, with the heaviest
rainfall situated across southern Virginia. The heaviest of
these rains will work northward into central Virginia over the
next several hours, and continue across central Virginia through
at least the first half of the night. The steadiest rains may
move to the north of central Virginia during the second half of
the night, but more intermittent heavier bursts of convective
rainfall may still be possible through the second half of the
night. The steadier precipitation shield will spread northward
through the Shenandoah Valley and Potomac Highlands through the
night. Very heavy rainfall will likely lead to widespread
flooding issues tonight from central Virginia northward through
the Shenandoah Valley. A rare High Risk for excessive rainfall
from WPC has been issued across these areas. The West Virginia
Panhandle and western Maryland will also get into the steady,
heavy rainfall tonight, with much of it falling during the
second half of the night. These locations will likely
experiences issues with Flash Flooding during the second half of
the night. Overall, a widespread 3-5 inches of rainfall is
expected for these locations, with isolated totals up to 7
inches. Locally higher totals approaching 10 inches may be
possible along the east facing slopes of the Blue Ridge, where
upslope easterly flow may will lead to orographic enhancement of
the rain. For those reasons, the above locations are in a Flood
Watch for flash flooding from 8 PM tonight through 8 PM
tomorrow.

Further east, rainfall will be more intermittent and showery
along the I-95 corridor tonight as the core of the system
passes to the west. As a result, issues with flooding aren`t
anticipated overnight. Tomorrow, as the system tracks northward
into Pennsylvania, a feeder rainfall band is expected to
develop to the south of the circulation and slowly track
eastward across locations to the east of the Blue Ridge. Very
heavy rainfall may be possible within this band, and could lead
to localized instances of flash flooding where training occurs.
Confidence in widespread flooding associated with this activity
tomorrow morning through mid-afternoon tomorrow remains too low
for a Flood Watch, but one may potentially be considered at a
later time. For locations further east (outside of the Flood
Watch), a broad 1-3 inches of rainfall is expected, with more
localized totals up to 5 inches. Rainfall should finally move
out of the area late tomorrow afternoon.

Tornadoes: There is growing concern that tornadoes may impact
portions of the area, especially later this evening into the
overnight hours. The zone with an environment most favorable
for tornadoes is currently located to our south over southern
Virginia and North Carolina. Over time, this environment
characterized by ample shear in the low levels, limited
instability, and large curved hodographs will lift northward
into our area, with tornado potential in central Virginia likely
beginning somewhere within the 6-8 PM time window. As the
system tracks northward through the night, the area favorable
for tornadoes will spread northward through the Shenandoah
Valley and into the West Virginia Panhandle. SPC has highlighted
these locations in a Slight Risk for severe thunderstorms,
driven by tornadoes. With the potential for most of this
activity to occur after dark, we encourage people to have a way
to receive tornado warnings at night, and to be ready to take
shelter in the middle of the night, if needed.

The threat for tornadoes may shift eastward tomorrow to
locations east of the Blue Ridge within the aforementioned
feeder band that will develop to the south of the circulation
as it tracks into Pennsylvania. Any tornado potential tomorrow
would likely be maximized during the morning to early afternoon
hours. SPC has upgraded the Baltimore area to a Slight Risk for
severe thunderstorms tomorrow, with the threat being driven by
both tornadoes and damaging straight line winds. Overall, 0-1 km
SRH is lower compared to overnight, so that may lead to a
slightly lower tornado potential than overnight, but chances for
straight line winds will be increased as limited heating and
destabilization occurs ahead of the convective line.

Background winds: Outside of any thunderstorms, winds may gust
to around 30-40 mph at times, especially during the daylight
hours to the east of the Blue Ridge. This may be enough to bring
down a few trees with saturated soil conditions, but is below
the Wind Advisory threshold of 40 knots/46 mph.

 

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