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2017 Severe Thread


mappy

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32 minutes ago, WxWatcher007 said:

We'll never get past CODE YODA with you as part of my system lol.

Friday is still a ways off ;) I could still bite at some point. For now I won't. I'd rather be meh now and ramp up. Don't want to be like the SPC tossing us into a mod on day 2 ;) immediately cursed

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3 minutes ago, WxWatcher007 said:

I wouldn't do that. The system is (mostly) serious. I think it has proven to be pretty accurate in terms of expectation setting.

In all fairness though - I've become a much more bearish person on most severe events. Blame like a decade of Ian influence from the days of EasternUSWX. Bearish tends to work more often than not around these parts. I still get giddy at nice parameter maps - but I'm getting less weenie with time I think. 

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2 minutes ago, Kmlwx said:

In all fairness though - I've become a much more bearish person on most severe events. Blame like a decade of Ian influence from the days of EasternUSWX. Bearish tends to work more often than not around these parts. I still get giddy at nice parameter maps - but I'm getting less weenie with time I think. 

Perhaps your attitude may change come June 13th. (Inside Joke)

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2 hours ago, George BM said:

Just For Entertainment:

Hardcore NAMing lol.

Quick, hug the NAM! 

NAMMA_con_stp_048.png

Is that yellow area where the nam says the squall line will be at  18z fri? I ask because wvec future trak has it going thru here much earlier  friday.

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Just now, ldub23 said:

Is that yellow area where the nam says the squall line will be at  18z fri? I ask because wvec future trak has it going thru here much earlier  friday.

No the line will be to the east. This just shows us the parameters should a storm be in that given area. While the most widespread rain and T-storms will be out of here by then, there may be some additional storms that develop to the southwest that may move into the DMV region during the afternoon/evening. 

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6z NAM nest simulated radar looks interesting for Friday late afternoon in northern VA, but that model tends to destabilize too quickly behind morning convective systems.   Instability will be the key tomorrow.      We usually fail at getting clearing behind morning systems, so the pessimism is justified, but it does occasionally work out here.

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21 minutes ago, high risk said:

6z NAM nest simulated radar looks interesting for Friday late afternoon in northern VA, but that model tends to destabilize too quickly behind morning convective systems.   Instability will be the key tomorrow.      We usually fail at getting clearing behind morning systems, so the pessimism is justified, but it does occasionally work out here.

12z NAM soundings really hitting the 15z to 21z time period

12z NAM at 18z THUR has KIAD 2000+ SBCAPE... 21z just below 2000 SBCAPE

This includes KEZF and KBWI and KDCA... and 0-6km shear is excellent of 40-50 knots

0-3km MLCAPE is in the 200-250 range, which is a little concerning to me

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GFS really nails the I 81 corridor with a precip bomb tomorrow morning.  I'd be worried about flooding, this setup is similar to 9/29/15, luckily the ocean is not as warm which means less PWAT.  Yeah, there might be that one EF0 that snaps a few branches near La Plata though.

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52 minutes ago, losetoa6 said:

Pwats aren't real high but they suggest moderately high moisture content...peaking tomorrow morning or so. I bet locally someone gets smoked with 3"+ qpf

Gfs -( 1.5 - 1.8") pwats

3knam- ( 1.5 - 1.8")

Tomorrow morning Hrrr Sim radar...

hrrr_ref_frzn_neus_18.png

Its already showing 3.5" totals in parts of Virginia. 

From this mornings LWX AFD:

Rain is expected to develop on the central VA blue ridge
through midday before becoming widespread tonight as strong srly
low- level jet develops and pushes a plume of 1.5-1.75 inch
precipitable water into the area ahead of strong frontal system.
A serly low- level component will enhance rainfall totals
against the Blue Ridge mtns where amounts will likely exceed 2
inches with the rest of the area seeing between 1-1.5 inches
through Fri afternoon. The 00Z EPS shows up to 80% prob of
exceeding 2 inches from Nelson up to Madison county while the
deterministic ECMWF, Canadian, and GFS show 4.3, 2.8, and 2.7
inches respectively in that same area. Bulk of the rainfall in
that area will fall in a roughly 6-hr period causing some
concern for flash flooding. Thunderstorms will also be possible
which could also enhance rainfall rates. See hydro discussion
below for more info.
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LWX Afternoon AFD has some, interesting wording ;) :

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
319 PM EDT Thu May 4 2017

.SYNOPSIS...
Strong Low pressure over the Tennessee Valley this afternoon will
track slowly north to western Pennsylvania Friday, then linger over
upstate New York through Sunday. Weak high pressure will build
into the area late Sunday, and remain through the middle of
next week.

&&

.NEAR TERM /THROUGH FRIDAY/...
As of 3pm, deep low pressure is centered over the Mid-South with
a warm front extending NE to Lake Erie with surface high
pressure centered off southern NE. Deep layer shear essentially
increasing over the central Mid-Atlantic through the next 24
hours as the upper level low shifts east across Tennessee.

SE surface flow over the area is slowly saturating the area with
dewpoints in the low 40s for northern portions of the CWA and
mid to upper 40s south. Rain onset on the central VA Blue Ridge
should be about now given the 4kft ceiling at KCHO. Went for
stratiform precip mode into late tonight in the SE flow.

Enhanced rain expected to begin this evening over central VA and
move up the Blue Ridge to MD. The 12Z GFS features an inverted
trough right up the Blue Ridge which is where rain will be
focused. By 8am, expect 2-4 inches on the central VA Blue Ridge
with localized 5 inches possible. The Flood Watch is out from
Rappahannock Co south to Nelson Co including the central Shen
Vly as of now. Flood threat is late tonight with midnight to
noon Friday covering the whole threat time. Roughly 1 to 2
inches elsewhere including the Balt/Wash metros.

Dry slot overspreads the area from SW to NE through the day
Friday. A good conceptual model is low topped mini-supercells on
the eastern side of the dry slot with rain farther east and dry
to the west. Plenty of deep layer shear.

Max temps in the strong south flow Friday mid to upper 70s.
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7 minutes ago, Eskimo Joe said:

Tomorrow is a big sleeper flood/severe day, especially if we manage some clearing.  Not 'in', but this could be the surprise event of the spring for us.

I hope you are right. Tomorrow morning's commute could be a nightmare. If I didn't have a coworker whose last day is tomorrow I'd call off in an instant. 

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Yeah, my concern for flooding along the BR has increased tremendously. Granted, we haven't see the rains locally like they have in SW Virginia, but, if hi-res models are correct, 3-4"+ in a few hours will cause flash floods. Could be a long night for me/early morning for the chief tomorrow. 

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