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June 2013 Observations and Discussions


SACRUS

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I think we'll have enough destabilization today to support organized convection later. SPC was worried about the lack of destabilization with their early morning outlook..but the sun looks to shine for at least a few more hours.

The somewhat meager lapse rates might put a lid on what otherwise would have been a bigger threat -- and the timing isn't great for our area with the track of the surface low.

That said I think there could be a swath of wind reports from convection stretching from the Mid Atlantic and SE PA into our area. The storms may become elevated by the time they reach points east of NYC tonight.

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Mt. Holly 

 

 

 

POPS WILL BE FURTHER ADJUSTED DOWN FOR THIS AFTN EXCEPT DEL VALLEY
WEST AND I 80 NORTH WHERE TSTMS WILL DEVELOP SOMETIME LATE TODAY
OR THIS EVENING. THERE IS STILL A SMALL CHC OF CONVECTION IN S NJ/DE
AROUND 18Z NEAR ANY CONVERGENCE ZONE BUT THE REAL DEAL ACTION WILL
BE LATE IN THE DAY IN E PA/E/MD.

THE NEG TILT SHORT WAVE WITH ASSTD SFC LOW DEEPENING INTO PA ARRIVES
LATE THIS AFTN AND EVENING...RUNNING INTO 1200J ML CAPE EXTENDED
N-S FROM THE HUD VALLEY THRU NJ-DELMARVA AND 30KT OF 0-6KM SHEAR
NE PA AND NNJ. THE INTENSIFICATION OF THE SFC LOW INTO PA LATE
TODAY IS FOR ME A STRONG SIGNAL FOR SIGNIFICANT SVR...AS FLUXES
INCREASE AND INTENSITY OF THE SFC LOW IS ANOMALOUS (-2SD) HERE FOR
THIS TIME OF YEAR.


SVR AND FF POTENTIAL IF CONVECTION OCCURS BETWEEN 4 PM AND 2 AM
FRIDAY OVER NE PA AND NNJ. FFG IS SO HIGH IN NE PA THAT NO FFA THERE.
THERE IS ISOLATED TORNADO POTENTIAL...ESPECIALLY IMO..NEAR AND N
OF RTE 80 WHERE BETTER 0-3KM SHEAR IS EXPECTED.
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I think we'll have enough destabilization today to support organized convection later. SPC was worried about the lack of destabilization with their early morning outlook..but the sun looks to shine for at least a few more hours.

The somewhat meager lapse rates might put a lid on what otherwise would have been a bigger threat -- and the timing isn't great for our area with the track of the surface low.

That said I think there could be a swath of wind reports from convection stretching from the Mid Atlantic and SE PA into our area. The storms may become elevated by the time they reach points east of NYC tonight.

Yea models from last night did not show this much sun.

- 84 here in Queens with a 73 dew point (looks like sea breeze just came in)

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Visible satellite imagery shows an additional area of clearing ahead of what seems to be the focal point for initial convective development near the Chesapeake at the moment. As this shifts northeast I think we will begin to see convection develop across Southeast PA/Southwest NJ and traverse through the state.

 

http://www.meteo.psu.edu/~fxg1/SAT_PA/anim8vis.html

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Visible satellite imagery shows an additional area of clearing ahead of what seems to be the focal point for initial convective development near the Chesapeake at the moment. As this shifts northeast I think we will begin to see convection develop across Southeast PA/Southwest NJ and traverse through the state.

http://www.meteo.psu.edu/~fxg1/SAT_PA/anim8vis.html

We've had a lot more sun than the models were suggesting today. Convection should start to fire within the next hour or two. I haven't checked the instability parameters but I'm assuming they are on the rise.

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DEEP LAYER SHEAR ACROSS MUCH OF THE REGION IS EXPECTED TO REMAIN

WEAK THROUGH THE PERIOD. HOWEVER...FORCING ASSOCIATED WITH THE MAIN

IMPULSE TURNING EAST OF THE NORTH CENTRAL APPALACHIANS...COUPLED

WITH AN ASSOCIATED BELT OF MODEST LOWER/MID-LEVEL FLOW...COULD

ENHANCE CONVECTIVE DEVELOPMENT LATE THIS AFTERNOON ACROSS PARTS OF

EASTERN VIRGINIA/MARYLAND AND THE DELMARVA PENINSULA INTO NORTHERN

MID ATLANTIC COASTAL AREAS. A LINE OR CLUSTER OF STORMS APPEARS

POSSIBLE...WITH THE RISK FOR POTENTIALLY DAMAGING WIND GUSTS.

OTHER SCATTERED STRONG/SEVERE STORM DEVELOPMENT STILL APPEARS

POSSIBLE IN THE PRESENCE OF MODERATE INSTABILITY...NORTHWARD INTO

UPSTATE NEW YORK...AND SOUTHWARD...TO THE SOUTH AND EAST OF THE

SOUTHERN APPALACHIANS. IT IS POSSIBLE THAT THE CONVECTIVELY

ENHANCED PERTURBATION COULD CONTRIBUTE TO ANOTHER CLUSTER OVER

STORMS TODAY ACROSS PARTS OF ALABAMA AND GEORGIA...WHICH COULD

PERHAPS DEVELOP SOUTHWARD INTO NORTHERN FLORIDA.

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60% chance for a watch soon:

 

mcd1266.gif

MESOSCALE DISCUSSION 1266   NWS STORM PREDICTION CENTER NORMAN OK   1204 PM CDT THU JUN 27 2013   AREAS AFFECTED...UPPER MID-ATLANTIC...NORTHEAST   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE    VALID 271704Z - 271900Z   PROBABILITY OF WATCH ISSUANCE...60 PERCENT   SUMMARY...TSTM COVERAGE AND INTENSITY WILL INCREASE IN ASSOCIATION   WITH AN MCV SHIFTING NEWD FROM NRN VA. STRENGTHENING DEEP-LAYER   SHEAR ALONG WITH CONTINUED DOWNSTREAM DESTABILIZATION SHOULD BE   SUFFICIENT FOR AT LEAST ISOLATED SEVERE TSTMS WITH A PRIMARY RISK OF   DAMAGING WINDS AND SOME HAIL.   DISCUSSION...16Z SURFACE ANALYSIS PLACED A 1006 MB CYCLONE NEAR THE   MD PANHANDLE WITH AN MCV EVIDENT IN VISIBLE SATELLITE IMAGERY ACROSS   NRN VA AHEAD OF THE BROADER MID-LEVEL TROUGH CROSSING THE CNTRL   APPALACHIANS. SURFACE TEMPERATURES HAVE HEATED WELL INTO THE 80S   DOWNSTREAM OF THE THICKER CLOUD DECKS ASSOCIATED WITH THE MCV AND   ALONG THE APPALACHIANS. A NARROW BELT OF MODERATELY STRONG MID-LEVEL   SWLYS /AROUND 30-35 KT/ WAS SAMPLED IN CCX/BGM VWP DATA AND THIS   ENHANCEMENT SHOULD SHIFT EWD THROUGH THE AFTERNOON.   MEANWHILE...STRONGER LOW-LEVEL FLOW SAMPLED IN AKQ VWP DATA SHOULD   DEVELOP NEWD ALONG THE COASTAL PLAIN. SETUP MAY YIELD SEVERAL   CLUSTERS WITH DAMAGING WINDS AND MARGINALLY SEVERE HAIL AS THE MAIN   HAZARDS...WITH PERHAPS A BRIEF TORNADO OR TWO POSSIBLE WITH   TRANSIENT SUPERCELL STRUCTURES NEAR THE ATLANTIC COAST.   ..GRAMS/KERR.. 06/27/2013   ATTN...WFO...OKX...ALY...PHI...BGM...AKQ...CTP...LWX...

http://www.spc.noaa.gov/products/md/md1266.html

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It's not even moving in our direction

Yeah....ok

 

Every model run today gets the core of heavy rain as far east as northern NJ.

 

Anyway we'll know in the next few hours who is right

 

Even the higher resolution models are having a very difficult time nailing down the exact locations that will see the moisture trains over the next several days.

 

Fairly amplifed trough building in

 

tran.gif?1372355501850

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Yeah....ok

 

Every model run today gets the core of heavy rain as far east as northern NJ.

 

Anyway we'll know in the next few hours who is right

 

Even the higher resolution models are having a very difficult time nailing down the exact locations that will see the moisture trains over the next several days.

 

Fairly amplifed trough building in

 

 

 

 

Yeah but as earthlight said our stuff is probably going to develop over SE PA/SW NJ and move in our direction. The stuff in central PA does not look like its going to reach most of us based on its current trajectory.

 

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Did not expect this!

 

WOUS64 KWNS 271754
     WOU7
    
     BULLETIN - IMMEDIATE BROADCAST REQUESTED
     TORNADO WATCH OUTLINE UPDATE FOR WT 377
     NWS STORM PREDICTION CENTER NORMAN OK
     200 PM EDT THU JUN 27 2013
    
     TORNADO WATCH 377 IS IN EFFECT UNTIL 1000 PM EDT FOR THE
      FOLLOWING LOCATIONS
    
     DCC001-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     DC
     .    DISTRICT OF COLUMBIA COUNTIES INCLUDED ARE
    
     DISTRICT OF COLUMBIA
    
    
     DEC001-003-005-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     DE
     .    DELAWARE COUNTIES INCLUDED ARE
    
     KENT                 NEW CASTLE          SUSSEX             
    
    
     MDC003-005-009-011-013-015-017-021-025-027-029-031-033-035-037-
     041-043-510-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     MD
     .    MARYLAND COUNTIES INCLUDED ARE
    
     ANNE ARUNDEL         BALTIMORE           CALVERT            
     CAROLINE             CARROLL             CECIL              
     CHARLES              FREDERICK           HARFORD            
     HOWARD               KENT                MONTGOMERY         
     PRINCE GEORGES       QUEEN ANNE'S        ST. MARYS          
     TALBOT               WASHINGTON         
    
    
     MARYLAND INDEPENDENT CITIES INCLUDED ARE
    
     BALTIMORE CITY      
    
    
     NJC001-005-007-009-011-015-019-021-023-025-027-029-033-035-037-
     041-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     NJ
     .    NEW JERSEY COUNTIES INCLUDED ARE
    
     ATLANTIC             BURLINGTON          CAMDEN             
     CAPE MAY             CUMBERLAND          GLOUCESTER         
     HUNTERDON            MERCER              MIDDLESEX          
     MONMOUTH             MORRIS              OCEAN              
     SALEM                SOMERSET            SUSSEX             
     WARREN              
    
    
     PAC001-011-017-025-029-037-041-043-045-055-057-061-067-071-075-
     077-087-089-091-093-095-097-099-101-107-109-119-133-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     PA
     .    PENNSYLVANIA COUNTIES INCLUDED ARE
    
     ADAMS                BERKS               BUCKS              
     CARBON               CHESTER             COLUMBIA           
     CUMBERLAND           DAUPHIN             DELAWARE           
     FRANKLIN             FULTON              HUNTINGDON         
     JUNIATA              LANCASTER           LEBANON            
     LEHIGH               MIFFLIN             MONROE             
     MONTGOMERY           MONTOUR             NORTHAMPTON        
     NORTHUMBERLAND       PERRY               PHILADELPHIA       
     SCHUYLKILL           SNYDER              UNION              
     YORK                
    
    
     VAC013-059-107-600-280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     VA
     .    VIRGINIA COUNTIES INCLUDED ARE
    
     ARLINGTON            FAIRFAX             LOUDOUN            
    
    
     VIRGINIA INDEPENDENT CITIES INCLUDED ARE
    
     FAIRFAX             
    
    
     ANZ430-431-530-531-532-533-534-535-536-537-538-539-540-541-542-
     280200-
     /O.NEW.KWNS.TO.A.0377.130627T1800Z-130628T0200Z/
    
     CW
    
     .    ADJACENT COASTAL WATERS INCLUDED ARE
    
     DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE
    
     DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE
    
     CHESAPEAKE BAY NORTH OF POOLES ISLAND MD
    
     CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD
    
     CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD
    
     CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD
    
     CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA
    
     TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD
    
     TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD
    
     TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA
    
     PATAPSCO RIVER INCLUDING BALTIMORE HARBOR
    
     CHESTER RIVER TO QUEENSTOWN MD
    
     EASTERN BAY
    
     CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER
    
     PATUXENT RIVER TO BROOMES ISLAND MD
    
     ATTN...WFO...LWX...PHI...CTP...
     
    
 

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