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Dewpoints were high yesterday but no storms. So you have to see what is triggering it today because DPs aren't the cause.
NWS Boston.. Storms happening because of the front/shortwave and surface heat causing instability. Look at capes and mid level lapse rates too.
Quote:
NATIONAL WEATHER SERVICE TAUNTON MA
430 PM EDT WED MAY 27 2015
.NEAR TERM /UNTIL 10 PM THIS EVENING/...
***A FEW STRONG TO PERHAPS EVEN A MARGINALLY SEVERE THUNDERSTORM OR
TWO POSSIBLE ACROSS WESTERN MA/NORTHERN CT BETWEEN 6 AND 10 PM
THIS EVENING***
A CLUSTER OF SHOWERS AND THUNDERSTORMS HAVE DEVELOPED ACROSS EASTERN
NY IN RESPONSE TO AN APPROACHING SHORTWAVE AND ITS ASSOCIATED
INSTABILITY. SPC MESO-ANALYSIS SHOWING CAPES ON THE ORDER OF 1500
TO 2000 J/KG HAVE DEVELOPED ACROSS WESTERN MA/NORTHWEST CT.
HOWEVER...AS IS USUALLY CASE THERE ARE SOME LIMITING FACTORS IN OUR
REGION. MID LEVEL LAPSE RATES ARE MARGINAL AND OUR WESTERN ZONES ARE
ON THE FRINGE OF THE BETTER INSTABILITY/FORCING. THE ACTIVITY WILL
ALSO BE ENTERING OUR REGION AFTER PEAK HEATING.
SO ALL IN ALL...IT LOOKS LIKE SCATTERED SHOWERS/THUNDERSTORMS WILL
MOVE INTO WESTERN MA/NORTHWEST CT SOMEWHERE BETWEEN 6 AND 10 PM THIS
EVENING. PRIMARY THREAT WILL BE LOCALLY HEAVY RAINFALL AND
DANGEROUS CLOUD TO GROUND LIGHTNING. HOWEVER...A FEW STRONG TO
PERHAPS A MARGINALLY SEVERE THUNDERSTORM OR TWO ARE POSSIBLE GIVEN
DECENT INSTABILITY AND 30 TO 35 KNOTS OF SHEAR. THE BIGGEST THREAT
WOULD BE VERY LOCALIZED STRONG TO DAMAGING WIND GUSTS WITH HAIL A
SECONDARY CONCERN.
ACTIVITY SHOULD QUICKLY WEAKEN TO MAINLY SCATTERED SHOWERS AS IT
ATTEMPTS TO ENTER CENTRAL MA LATER IN THE EVENING WITH WANING
INSTABILITY AND LESS DYNAMICS/FORCING.
Sun setting, less surface heat, less instability and less forcing from the front.
But that's what I was talking about when we were in the discussion of dry vs. humid heat. Humid heat is good for convection, dry heat isn't. That's why I prefer it. I'd rather 90 F with a 72 F DP than 90 F with a 55 F DP for that reason.
I don't think of that as dry, because within a few days a front may move in and bring rain. Convective rainfall from high humidity is unreliable, considering I can get long humid stretches with no rain. I'm thinking the difference in perspective is because all your rainfall is convective. This month had plenty of rain and thunderstorms, rather cool July but the dew point were about average, meaning higher relative humidity. Which makes considering the amount of rain:
Well, I never said DPs where the "only" reason for storms. I was just stating that my reason for liking humid heat over dry heat is a higher chance of storms.
I think Nei is right though, that it's probably all a matter of perspective.
Getting closer. Nastiness coming to NWCT and Heads up and Western MA
I see something trying to developing over Ossining which would hit SWCT
90° in Linden again
Skies got grayer now. Goodbye sun
Another warning issued south of Poughkeepsie. Come on Marine Layer, break this line up here.
NATIONAL WEATHER SERVICE NEW YORK NY
529 PM EDT WED MAY 27 2015
THE NATIONAL WEATHER SERVICE IN UPTON NY HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN ORANGE COUNTY IN SOUTHEASTERN NEW YORK...
* UNTIL 600 PM EDT
* AT 529 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 GOSHEN...AND MOVING
NORTHEAST AT 30 MPH.
* THIS SEVERE THUNDERSTORM WILL BE NEAR...
WALDEN AND BEAVERDAM LAKE-SALISBURY MILLS AROUND 540 PM EDT.
NEW WINDSOR AND GARDNERTOWN AROUND 550 PM EDT.
NEWBURGH AROUND 555 PM EDT.
THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
WESTERN HAMPSHIRE COUNTY IN WESTERN MASSACHUSETTS...
WESTERN HAMPDEN COUNTY IN WESTERN MASSACHUSETTS...
FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...
* UNTIL 630 PM EDT
* AT 527 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH AND HAIL AS LARGE AS QUARTERS. THESE STORMS WERE LOCATED ALONG
A LINE EXTENDING FROM SOUTHWEST VERMONT INTO EASTERN NEW YORK...
AND WERE MOVING EAST AT 35 MPH.
* SOME LOCATIONS IMPACTED INCLUDE...
WESTFIELD...NORTHAMPTON...GREENFIELD...DEERFIELD.. .EASTHAMPTON...
MONROE...MONTAGUE...SOUTHAMPTON...SUNDERLAND...HAT FIELD...
NORTHFIELD...WILLIAMSBURG...HUNTINGTON...BERNARDST ON...BUCKLAND...
CONWAY...SHELBURNE...ERVING...RUSSELL AND ASHFIELD.
THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
WESTERN HAMPSHIRE COUNTY IN WESTERN MASSACHUSETTS...
WESTERN HAMPDEN COUNTY IN WESTERN MASSACHUSETTS...
FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...
* UNTIL 630 PM EDT
* AT 527 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH AND HAIL AS LARGE AS QUARTERS. THESE STORMS WERE LOCATED ALONG
A LINE EXTENDING FROM SOUTHWEST VERMONT INTO EASTERN NEW YORK...
AND WERE MOVING EAST AT 35 MPH.
* SOME LOCATIONS IMPACTED INCLUDE...
WESTFIELD...NORTHAMPTON...GREENFIELD...DEERFIELD.. .EASTHAMPTON...
MONROE...MONTAGUE...SOUTHAMPTON...SUNDERLAND...HAT FIELD...
NORTHFIELD...WILLIAMSBURG...HUNTINGTON...BERNARDST ON...BUCKLAND...
CONWAY...SHELBURNE...ERVING...RUSSELL AND ASHFIELD.
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