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Spring severe weather chatter


Ian

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First thread had too many thunderstorms.

 

I'll keep the first post a running list of bigger events:

 

February 24 2016 - Mid-Atlantic and Carolinas

http://www.americanwx.com/bb/index.php/topic/47932-feb-24-2016-severe-weather-outbreak/

 

May 2 2016 - Supercellpalooza in the DC area

http://www.americanwx.com/bb/index.php/topic/47947-spring-severe-weather-chatter/?p=4102810

 

June 5 - Enhanced risk DC split

http://www.americanwx.com/bb/index.php/topic/48379-june-4-5-2016-rain-and-storms-obs-and-discussion/

 

June 16-17 - Was that a derecho west of town?

http://www.americanwx.com/bb/index.php/topic/48424-june-16th-17th-floodmageddon/

 

 

 

And some eye candy. The god of fast-moving terrible storms to do anything but lose power during, encased in 100 degree heat.

 

jDoevgi.jpg

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Do we have anyone dedicated enough to keep track of the number of severe warnings we get and how many of those verify? I'm curious....

Could pull them from IEM.. the warnings at least. Verify not sure on automated options, might be a pain. Though I think many/most svr probably verify here.. it takes like 40 mph winds to bring down trees. :P

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  • 1 month later...

Some sun poking out now.... 12z NAM soundings (21z at KIAD/EZF/BWI/DCA in particular) decent for maybe a few severe storms this afternoon into the evening

 

LWX late morning disco:

 

DEWPOINTS IN THE 60S AHEAD OF THE FRONT ALONG WITH THE WARM
AIRMASS WILL LEAD TO SOME INSTABILITY THIS AFTERNOON INTO THIS
EVENING ALONG AND AHEAD OF THE FRONT. 12Z MODIFIED KIAD RAOB SHOWS
AROUND 1KJ/KG OF MLCAPE THIS AFTERNOON. CAPE IS SKINNY AND DRY AIR
ALOFT MAY ENTRAIN INTO UPDRAFTS KEEPING MOST STORMS BELOW SEVERE
LEVELS. HOWEVER...THE SHEAR PROFILES ARE STRONG AND WITH DRY AIR
ALOFT IF ANY REFLECTIVITY CORES DO DEVELOP...THEN LOCALLY DAMAGING
WIND GUSTS AND LARGE HAIL ARE POSSIBLE. THE BEST CHANCE FOR A
STRONGER THUNDERSTORM WILL BE NEAR AND EAST OF THE BLUE RIDGE
MOUNTAINS. DO THINK THAT COVERAGE OF CONVECTION WILL BE
LIMITED...ISOLATED TO SCATTERED DUE TO WEAK FORCING ALONG THE
FRONT AND THE STRONG DRY SLOT MOVING OVERHEAD AT THE SAME TIME.
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SEVERE WEATHER STATEMENT  

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  

418 PM EDT FRI APR 1 2016  

 

VAC003-125-540-012030-  

/O.CON.KLWX.SV.W.0012.000000T0000Z-160401T2030Z/  

CITY OF CHARLOTTESVILLE VA-ALBEMARLE VA-NELSON VA-  

418 PM EDT FRI APR 1 2016  

 

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT  

FOR SOUTHERN ALBEMARLE AND EAST CENTRAL NELSON COUNTIES AND THE  

SOUTHERN CITY OF CHARLOTTESVILLE...  

 

AT 417 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE  

OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60  

MPH. THIS STORM WAS LOCATED NEAR SCHUYLER...OR 15 MILES SOUTHWEST OF  

CHARLOTTESVILLE...MOVING EAST AT 30 MPH.  

 

LOCATIONS IMPACTED INCLUDE...  

CHARLOTTESVILLE...SCHUYLER...SCOTTSVILLE...ESMONT...KEENE...KESWICK...  

FABER...WOODRIDGE...GLENDOWER...MONTICELLO...COVESVILLE...NORTH GARDEN...  

DAMON...OVERTON...SHADWELL...BOYD TAVERN AND ALBERENE.  

 

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BULLETIN - IMMEDIATE BROADCAST REQUESTED  

SEVERE THUNDERSTORM WARNING  

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  

449 PM EDT FRI APR 1 2016  

 

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A  

 

* SEVERE THUNDERSTORM WARNING FOR...  

WEST CENTRAL BALTIMORE COUNTY IN NORTHERN MARYLAND...  

CENTRAL CARROLL COUNTY IN NORTH CENTRAL MARYLAND...  

NORTHWESTERN HOWARD COUNTY IN CENTRAL MARYLAND...  

SOUTHEASTERN WASHINGTON COUNTY IN NORTH CENTRAL MARYLAND...  

NORTHWESTERN MONTGOMERY COUNTY IN CENTRAL MARYLAND...  

SOUTHERN FREDERICK COUNTY IN NORTH CENTRAL MARYLAND...  

NORTHEASTERN LOUDOUN COUNTY IN NORTHERN VIRGINIA...  

 

* UNTIL 515 PM EDT  

 

* AT 449 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM  

CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS  

OF 60 MPH. THIS STORM WAS LOCATED NEAR POINT OF ROCKS...OR 7 MILES  

SOUTHWEST OF HARRY GROVE STADIUM...AND MOVING NORTHEAST AT 55 MPH.  

 

* LOCATIONS IMPACTED INCLUDE...  

FREDERICK...WESTMINSTER...DAMASCUS...HARRY GROVE STADIUM...ELDERSBURG...  

BALLENGER CREEK...MOUNT AIRY...BRUNSWICK...WALKERSVILLE...SYKESVILLE...  

BRADDOCK HEIGHTS...OAKLAND...NEW MARKET...CLOVER HILL...POINT OF ROCKS...  

LINGANORE-BARTONSVILLE...DISCOVERY-SPRING GARDEN...GREEN VALLEY...  

GAMBER AND ADAMSTOWN.  

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  • 4 weeks later...

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
301 PM EDT MON APR 25 2016

.SYNOPSIS...

&&

.NEAR TERM /THROUGH TONIGHT/...
HIGH PRESSURE IS OFF THE EAST COAST WHILE LOW PRESSURE MOVES
THROUGH THE UPPER MID-WEST THIS AFTERNOON. LIGHT SRLY FLOW AND
MOSTLY SUNNY SKIES WILL ALLOW TEMPS TO MAX OUT IN THE U70S/L80S
THIS AFTERNOON. A CU FIELD HAS FORMED ACROSS THE HIGHER TERRAIN. A
FEW SHOWERS MAY FORM THIS AFTERNOON HOWEVER DRY AIR AND LOW DEWPTS
WILL LIKELY KEEP THE COVERAGE ISOLATED.

HIGH PRESSURE MOVES FURTHER OFF THE COAST TONIGHT AS LOW PRESSURE
MOVES ACROSS THE GREAT LAKES. AN ASSOCIATED FRONTAL BOUNDARY WILL
SLOWLY APPROACH THE MID-ATLANTIC REGION FROM THE NORTH. MOST SHOWERS
ARE EXPECTED NORTH OF THE MD/PA BORDER OVERNIGHT HOWEVER DEPENDING
ON THE STRENGTH OF THE SHOWERS AND THUNDERSTORMS THAT FORM TODAY
ACROSS THE GREAT LAKES...THE MID-ATLANTIC MAY SEE MORE ACTIVITY MOVE
INTO NRN MD. KEPT CHANCES LOW AT THIS TIME BUT WILL BE CLOSELY
MONITORED.


&&

.SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
AN ACTIVE PERIOD BEGINS TUESDAY AS THE FRONT MOVES SOUTHWARD ACROSS
PA. THE MID-ATLANTIC WILL BE IN THE WARM SECTOR WITH BREEZY SW FLOW
DURING THE DAY. TEMPS WILL CLIMB INTO THE 80S AND 70S IN THE MTNS BY
AFTERNOON. SW FLOW WILL ALSO DRIVE DEWPTS UP ON TUESDAY SO IT WILL
FEEL WARMER. AN UPPER LEVEL WIND MAX WILL DRIVE SOUTHWARD BY
TUESDAY AFTERNOON AND 0-6KM BULK SHEAR WILL INCREASE TO 30-40KTS.
THIS COUPLED WITH SBCAPE OF 1-2K K/JG WILL RESULT IN CONVECTIVE
DEVELOPMENT. THE BEST FORCING SEEMS TO BE ACROSS PA WITH SOME
ACTIVITY DROPPING INTO MD SO THE BEST CHANCE FOR STRONG TO SEVERE
STORMS TUESDAY WILL LIKELY BE IN THE NRN HALF OF THE LWX CWA. DMG
WINDS ARE THE MAIN THREAT IN STRONG THUNDERSTORM ACTIVITY.

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Slt expanded through DC, NOVA.

 

SPC - 

 

...MID ATLC...
WIDELY SCATTERED TSTMS SHOULD DEVELOP MIDDAY INTO AFTN ALONG/AHEAD OF SFC COLD FRONT...IN PLUME OF DCVA IMMEDIATELY PRECEDING MID/UPPER PERTURBATION. ACTIVITY SHOULD MOVE ESEWD...OFFERING SPORADIC SVR HAIL AND DAMAGING GUSTS. CLEARING BEHIND CLOUD/PRECIP REMNANTS OF OVERNIGHT/OH CONVECTION SHOULD PERMIT POCKETS OF FAVORABLE LOW-LEVEL INSOLATION/DESTABILIZATION...LEADING TO WELL-MIXED SUBCLOUD LAYER BENEATH 500-1000 J/KG MLCAPE. NEAR-SFC FLOW WILL BE VEERED WITH STG
WLY COMPONENT...AND DEEP-LAYER PROFILES ESSENTIALLY UNIDIRECTIONAL...LIMITING CONVERGENCE. HOWEVER...LACK OF SUBSTANTIAL CINH SHOULD SUPPORT TSTM DEVELOPMENT/MAINTENANCE FOR
SEVERAL HOURS AMIDST FAVORABLE SPEED SHEAR. POTENTIAL SHOULD DIMINISH RAPIDLY AFTER DARK AS COLD FROPA OCCURS OVER LARGER SHARE OF AREA AND REMAINING SFC WARM SECTOR COOLS DIABATICALLY.

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