Jump to content
  • Member Statistics

    17,589
    Total Members
    7,904
    Most Online
    LopezElliana
    Newest Member
    LopezElliana
    Joined

All-purpose Thunderstorm Discussion Thread


weatherwiz

Recommended Posts

  • Replies 1.4k
  • Created
  • Last Reply

We shall see what tomorrow brings.  While the degree of instability is certainly not the question I think the best mid and upper level forcing is going to be held back too far to the west (which always seems to be an issue) and lapse rates will probably be marginal (~6 C/KM)...although the GFS is much more impressive than the NAM but it always seems like that is the case and I don't know why.  

Anyways, while a pre-frontal should come by during the day and be a focal point for convective development, I think updrafts will struggle to maintain themselves once they reach a certain height so while we'll see several strong storms, they will have hard time reaching severe limits and sustaining themselves if they reach that point.  With such high PWATS and a juicy atmosphere, cape will also be a bit water logged too which will actually result in cape not being as strong as indicates.  

All in all...we may see scattered activity during the day but they could struggle to do a whole lot.  Main threat obviously is torrential downpours and vivid lightning, however, strong winds, perhaps some hail, and I suppose the possibility for an isolated tornado does exist as well, especially if winds remain backed in the valley...the flow is strong enough to certainly not discount this possibility.    

 

Link to comment
Share on other sites

11 minutes ago, Damage In Tolland said:

Seems like another meh severe day as forcing sucks

I'm actually not concerned about that. Seems like the bigger issue is that we're going to mix out dews today - all of the models show this to some extent - which should limit CAPE. We'll definitely see some storms but I think getting something other than marginally severe is unlikely.

Link to comment
Share on other sites

11 minutes ago, CT Rain said:

I'm actually not concerned about that. Seems like the bigger issue is that we're going to mix out dews today - all of the models show this to some extent - which should limit CAPE. We'll definitely see some storms but I think getting something other than marginally severe is unlikely.

I saw that. Definitely don't like seeing that. Very evident looking at 30mb Td on the NAM. 

Link to comment
Share on other sites

Severe Watch Likely for NNE...

image.gif

MESOSCALE DISCUSSION 1316
   NWS STORM PREDICTION CENTER NORMAN OK
   0932 AM CDT MON JUL 18 2016

   AREAS AFFECTED...NY ADIRONDACKS / VT / NH / SWRN AND SRN MAINE

   CONCERNING...SEVERE POTENTIAL...SEVERE THUNDERSTORM WATCH LIKELY 

   VALID 181432Z - 181630Z

   PROBABILITY OF WATCH ISSUANCE...80 PERCENT

   SUMMARY...AN ISOLATED RISK FOR LOCALLY SEVERE THUNDERSTORMS CAPABLE
   PRIMARILY OF A DAMAGING-WIND/HAIL THREAT...WILL LIKELY BEGIN NEAR
   MIDDAY AND DEVELOP DURING THE AFTERNOON.

   DISCUSSION...MORNING WATER-VAPOR IMAGERY SHOWS A SPEED MAX MOVING
   OVER THE LAKE HURON VICINITY AND WITHIN THE BASE OF A TROUGH LOCATED
   OVER ONTARIO.  ASCENT ASSOCIATED WITH THIS FEATURE WILL OVERSPREAD
   NRN NY AND NWRN NEW ENGLAND FROM W TO E DURING THE NEXT SEVERAL
   HOURS.  14Z SURFACE OBSERVATIONS SHOW TEMPS HAVE WARMED INTO THE
   LOWER 80S NEAR ALB AND INTO THE UPPER 70S-LOWER 80S OVER THE
   CHAMPLAIN VALLEY.  ALTHOUGH CIRRUS CLOUD COVER WILL RESULT IN
   FILTERED SUNSHINE...THE BOUNDARY LAYER WILL CONTINUE TO
   HEAT/DESTABILIZE.  KCXX SHOWS SLY 0-1 KM FLOW VEERING TO WLY AND
   INCREASING WITH HEIGHT TO 50-KT IN THE 3-5 KM ARL LAYER.  

   GIVEN THE ABOVE-SUPPORTING FACTORS FOR STORM
   DEVELOPMENT/ORGANIZATION...EXPECTING A GRADUAL INCREASE IN STORM
   COVERAGE/INTENSIFICATION DURING THE 14-17Z PERIOD.  THE WIND/HAIL
   RISK WILL LIKELY BEGIN WITH THE STRONGER CELLULAR STORMS /INCLUDING
   THE POSSIBILITY FOR WEAK SUPERCELLS/.  THE STRONG/SEVERE STORM
   THREAT WILL PROBABLY MOVE QUICKLY DOWNSTREAM ACROSS VT/NH AND INTO
   MAINE DURING THE EARLY TO MID AFTERNOON HOURS...OWING IN PART TO THE
   STRENGTH OF THE MEAN FLOW.
Link to comment
Share on other sites

20 minutes ago, powderfreak said:

Severe Watch Likely for NNE...

image.gif


MESOSCALE DISCUSSION 1316
   NWS STORM PREDICTION CENTER NORMAN OK
   0932 AM CDT MON JUL 18 2016

   AREAS AFFECTED...NY ADIRONDACKS / VT / NH / SWRN AND SRN MAINE

   CONCERNING...SEVERE POTENTIAL...SEVERE THUNDERSTORM WATCH LIKELY 

   VALID 181432Z - 181630Z

   PROBABILITY OF WATCH ISSUANCE...80 PERCENT

   SUMMARY...AN ISOLATED RISK FOR LOCALLY SEVERE THUNDERSTORMS CAPABLE
   PRIMARILY OF A DAMAGING-WIND/HAIL THREAT...WILL LIKELY BEGIN NEAR
   MIDDAY AND DEVELOP DURING THE AFTERNOON.

   DISCUSSION...MORNING WATER-VAPOR IMAGERY SHOWS A SPEED MAX MOVING
   OVER THE LAKE HURON VICINITY AND WITHIN THE BASE OF A TROUGH LOCATED
   OVER ONTARIO.  ASCENT ASSOCIATED WITH THIS FEATURE WILL OVERSPREAD
   NRN NY AND NWRN NEW ENGLAND FROM W TO E DURING THE NEXT SEVERAL
   HOURS.  14Z SURFACE OBSERVATIONS SHOW TEMPS HAVE WARMED INTO THE
   LOWER 80S NEAR ALB AND INTO THE UPPER 70S-LOWER 80S OVER THE
   CHAMPLAIN VALLEY.  ALTHOUGH CIRRUS CLOUD COVER WILL RESULT IN
   FILTERED SUNSHINE...THE BOUNDARY LAYER WILL CONTINUE TO
   HEAT/DESTABILIZE.  KCXX SHOWS SLY 0-1 KM FLOW VEERING TO WLY AND
   INCREASING WITH HEIGHT TO 50-KT IN THE 3-5 KM ARL LAYER.  

   GIVEN THE ABOVE-SUPPORTING FACTORS FOR STORM
   DEVELOPMENT/ORGANIZATION...EXPECTING A GRADUAL INCREASE IN STORM
   COVERAGE/INTENSIFICATION DURING THE 14-17Z PERIOD.  THE WIND/HAIL
   RISK WILL LIKELY BEGIN WITH THE STRONGER CELLULAR STORMS /INCLUDING
   THE POSSIBILITY FOR WEAK SUPERCELLS/.  THE STRONG/SEVERE STORM
   THREAT WILL PROBABLY MOVE QUICKLY DOWNSTREAM ACROSS VT/NH AND INTO
   MAINE DURING THE EARLY TO MID AFTERNOON HOURS...OWING IN PART TO THE
   STRENGTH OF THE MEAN FLOW.

Buckle up, We will see how it plays out

Link to comment
Share on other sites

A watch has been issued

WW0394 Radar

SEL4

   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 394
   NWS STORM PREDICTION CENTER NORMAN OK
   1115 AM EDT MON JUL 18 2016

   THE NWS STORM PREDICTION CENTER HAS ISSUED A

   * SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
     MAINE
     NEW HAMPSHIRE
     NORTHERN NEW YORK
     VERMONT
     LAKE ONTARIO

   * EFFECTIVE THIS MONDAY MORNING AND EVENING FROM 1115 AM UNTIL
     800 PM EDT.

   * PRIMARY THREATS INCLUDE...
     SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY
     SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
       INCHES IN DIAMETER POSSIBLE

   SUMMARY...FAST-MOVING THUNDERSTORMS ARE EXPECTED TO FORM ACROSS THE
   WATCH AREA THIS AFTERNOON...POSING A THREAT FOR LOCALLY DAMAGING
   WIND GUSTS AND HAIL.

   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 165
   STATUTE MILES EAST AND WEST OF A LINE FROM 105 MILES WEST
   NORTHWEST OF HOULTON MAINE TO 50 MILES WEST OF LEBANON NEW
   HAMPSHIRE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
   AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
   THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
   AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
   DO PRODUCE TORNADOES.

   &&

   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
   MOTION VECTOR 27035.


   ...HART

 

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...