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2018 Mid-Atlantic General Severe Discussion


Kmlwx

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59 minutes ago, 87storms said:

not the greatest setup today, but hrrr does have some activity early afternoon and then late afternoon.  who gets what and when, who knows.  the more sun fuel the better, so maybe we can get a few hours of it.

13z HRRR tries to bring a small line through DC around 20z (4pm) and then that is it

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Afternoon disco from LWX:

.LONG TERM /MONDAY THROUGH THURSDAY/...
A upper level 500mb ridge will continue to be in place over the
eastern parts of the midwest and the eastern United States. Skies
will remain most clear with a west to southwesterly flow. Dewpoints
temperatures will rise up into the 70s. The high dewpoints will
combine with high temperatures in the mid to upper 90s and lead to
heat index values in the upper 90s to low 100s.

Tuesday into Wednesday, the upper level 500mb ridge will begin to
break down. A cold front will approach the region from the
north, and move through the region late Tuesday into Wednesday.
Tuesday will continue with temperatures in the low to mid 90s
with some areas possibly reaching the upper 90s again. Heat
index values will likely be in the upper 90s and into the lower
100s again. As the frontal boundary approaches the region
Tuesday, the risk for convective showers and thunderstorms will
increase. The combination of high dew points and temperatures
will lead to high CAPE values. The combination of high
dewpoints/temps and the frontal boundary will lead to the risk
for thunderstorms and possibly severe weather. The frontal
boundary will move through the region sometime late Tuesday into
Wednesday. The boundary is forecast to stall over our region or
just to the south of our region. This boundary will likely act
as focus for the formation of showers and thunderstorms through
Thursday. Temperatures are expected to be cooler on Wednesday in
the low to mid 80s.

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we're clearly in the boring storms period of weather.  not a fan of relying on leftover debris from systems coming from nw.  that's very clipper-like and we are absolutely horrendous at clippers.  might need something more organized from the ohio valley or a frontal passage...or a mcs is always acceptable.

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2 hours ago, AfewUniversesBelowNormal said:

GFS ensembles are trending more northern-US ridge, constant above average. Maybe a derecho setup down the line. It's kind of trending away from El Nino. 

Maybe you mean MCS set up?  I dont think there is such a thing as a derecho set up

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LWX going a bit gung ho for Saturday in their morning AFD:

.SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/...
Rounds of showers and scattered thunderstorms are expected to
re-invigorate and spread northeastward across virtually the
entire Mid-Atlantic Friday afternoon into Friday night, before
departing to the northeast Saturday morning along and ahead of
the slowly advancing warm front. See the hydrology section for
details on the heavy rain/flooding threat.

Hedging on the side of climatology, the warm front will likely
get stuck near the Potomac River Saturday, enhancing low-level
directional shear. Speed shear increasing in the 0-6 km layer to
around 50 knots with around 40 kts at 850 mb. This couple with
abundant low-level moisture should lead to an environment
favorable for scattered strong to severe storms and perhaps a
couple supercells where best instability is pooled over
southeastern parts of the CWA. Gusty winds or an isolated
tornado would be possible in this scenario. SPC has southern
Maryland to the Fredericksburg Virginia area in a Marginal Risk,
with uncertainties in more robust instability given poor lapse
rates aloft.

The warm front should lift further north by Saturday evening,
with waning isentropic lift and diurnally decreasing instability
leading to a decrease in convection overnight.

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SPC likes what it sees today.

image.png.5fc0e1a07f11080c4f38bf90705fca45.png

...Central Appalachians to Middle Atlantic States...
   A moist warm sector will develop northward in wake of a warm front
   that will advance through Virginia into Pennsylvania with gradual
   surface-based destabilization as early-day clouds/showers clear,
   although MLCAPE should remain below 1500 J/kg in most areas. Winds
   aloft will increase with the approach of the shortwave trough
   supporting increasing vertical shear, which will be conducive for a
   few supercells. Forecast wind profiles show veering and augmented
   low-level shear in proximity to the warm front from northern
   Virginia into southern Pennsylvania. Current indications are that
   storms should develop over the central Appalachians and generally
   spread eastward through the afternoon and early evening, although
   downslope flow may tend to limit storm coverage with southward
   extent through Virginia. A couple of tornadoes appear possible with
   storms interacting with the warm front, while isolated damaging wind
   should otherwise be the main threat.
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9 minutes ago, Ellinwood said:

Cloudy skies all day will tend to do that. Mountains might catch a surprise.

Seems for some reason QFP NE of DC has been well below modeled for the last three events. Despite high precip water up to 2 inches during several days during the past two weeks I have not had any significant rain. Storms have either split, weakened or never developed , just like today. Thought the upper Bay may have had an effect but I doubt it.  Ground water moisture diminishing now. Wondering whether we return to the wetter weather by mid July due to the Atlantic SST profile. Euro says cooler and wetter down the road. Not holding my breathe.   

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