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2014 Mid-Atlantic Severe Discussion Thread


Kmlwx

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Our first watch of the day

 

 


SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 157NWS STORM PREDICTION CENTER NORMAN OK1155 AM EDT THU MAY 15 2014SEVERE THUNDERSTORM WATCH 157 IS IN EFFECT UNTIL 800 PM EDTFOR THE FOLLOWING LOCATIONS    VIRGINIA COUNTIES INCLUDED AREALBEMARLE            AMELIA              AMHERSTAPPOMATTOX           AUGUSTA             BRUNSWICKBUCKINGHAM           CAMPBELL            CAROLINECHARLOTTE            CHESTERFIELD        CLARKECULPEPER             CUMBERLAND          DINWIDDIEFAIRFAX              FAUQUIER            FLUVANNAFREDERICK            GOOCHLAND           GREENEGREENSVILLE          HALIFAX             HANOVERHENRICO              LOUDOUN             LOUISALUNENBURG            MADISON             MECKLENBURGNELSON               NOTTOWAY            ORANGEPAGE                 PITTSYLVANIA        POWHATANPRINCE EDWARD        PRINCE WILLIAM      RAPPAHANNOCKROCKINGHAM           SHENANDOAH          SPOTSYLVANIASTAFFORD             WARREN
MARYLAND COUNTIES INCLUDED AREFREDERICK            MONTGOMERY          WASHINGTON
WEST VIRGINIA COUNTIES INCLUDED AREBERKELEY             HAMPSHIRE           HARDYJEFFERSON            MORGAN
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   DISCUSSION...A LINE OF ONGOING THUNDERSTORMS WILL INTENSIFY THIS   AFTERNOON WHILE SHIFTING EASTWARD THROUGH THE PIEDMONT. OTHER STORMS   MAY FORM AHEAD OF THE SQUALL LINE ACROSS THE PIEDMONT AND COASTAL   PLAINS AS THE ENVIRONMENT BECOMES MODERATELY UNSTABLE. WIND SHEAR   PROFILES WILL BE SUPPORTIVE OF EMBEDDED BOWING STRUCTURES AND   SUPERCELLS CAPABLE OF DAMAGING WIND GUSTS AND PERHAPS A TORNADO OR   TWO.

 

http://www.spc.noaa.gov/products/watch/ww0157.html

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I'd be satisfied with a dozen good strikes and loud thunder. These kind of setups are never too exciting for most. The strong storms are typically really fast movers and only affect a really small area. 

 

I'm looking forward to the first hot / unstable day with discrete but prolific cells or a nasty line marching each at 40mph. 

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Several consecutive runs of the HRRR show the line struggling to make it east of a north-south line bisecting DC, except for maybe in northern MD.     The reason seems to be that it develops an area of substantial convective inhibition from DC to the east.    I thought earlier that it was due to low-level cooling, but it's tough to tell with the 10 degree contour interval on the HRRR web page.    It doesn't seem like a setup in which the line should fall apart as it hits the Potomac, but that model signal is tough to completely ignore.

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It looks decent... we had some nice sun before clouded up again... temps around 80 and DP's 65 and a good time of the day (maybe slightly earlier than we ideally want)

It's still a ways off. Probably will be pretty close to ideal time of day by the time it gets here.

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Several consecutive runs of the HRRR show the line struggling to make it east of a north-south line bisecting DC, except for maybe in northern MD.     The reason seems to be that it develops an area of substantial convective inhibition from DC to the east.    I thought earlier that it was due to low-level cooling, but it's tough to tell with the 10 degree contour interval on the HRRR web page.    It doesn't seem like a setup in which the line should fall apart as it hits the Potomac, but that model signal is tough to completely ignore.

Does the RAP agree?

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I'd be satisfied with a dozen good strikes and loud thunder. These kind of setups are never too exciting for most. The strong storms are typically really fast movers and only affect a really small area. 

 

I'm looking forward to the first hot / unstable day with discrete but prolific cells or a nasty line marching each at 40mph. 

So you've gone over to the dark side, huh?

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Does the RAP agree?

 

        not really, although it's tough to evaluate a mesoscale feature at 13 km.    It doesn't have the line per se, but it does have precip making it east of DC.    It shows, however, that some precip should be falling east of DC by now, and that isn't the case.    The RAP is on board with increasing CIN around dinner time.

 

  edit:   I guess there are some cells forming east of DC, although they're well northeast of town

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Token warning.  Haven't even gusted to 10mph at home.  Nice rain rates though.

BULLETIN - EAS ACTIVATION REQUESTEDSEVERE THUNDERSTORM WARNINGNATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC450 PM EDT THU MAY 15 2014THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A* SEVERE THUNDERSTORM WARNING FOR...  CITY OF FAIRFAX IN NORTHERN VIRGINIA...  SOUTHEASTERN CITY OF MANASSAS PARK IN NORTHERN VIRGINIA...  SOUTHEASTERN PRINCE WILLIAM COUNTY IN NORTHERN VIRGINIA...  CENTRAL FAIRFAX COUNTY IN NORTHERN VIRGINIA...* UNTIL 530 PM EDT* AT 447 PM EDT...A SEVERE THUNDERSTORM WAS DETECTED NEAR  MONTCLAIR...OR NEAR DALE CITY...AND WAS MOVING NORTH AT 35 MPH.  THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60  MPH.* LOCATIONS IMPACTED INCLUDE...  LAKE RIDGE...  LORTON...  BURKE...  FAIRFAX...  MANTUA...  MERRIFIELD...  CHANTILLY...  OAKTON...  VIENNA...  TYSONS CORNER...PRECAUTIONARY/PREPAREDNESS ACTIONS...THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...MOVE INDOORS TO ASTURDY BUILDING AND STAY AWAY FROM WINDOWS. WHEN IT IS SAFE TO DOSO...REPORT SEVERE WEATHER TO LOCAL LAW ENFORCEMENT OR TO THENATIONAL WEATHER SERVICE.
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