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JULY 2012 Severe Weather /Convection Discussion


NEG NAO

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Strange, I've lived on Long Island for the last 41 years and have seen hundreds of thunderstorms during that span....well, maybe it was just my imagination.

Not being a Texas homer, but I grew up in Massapequa, and while I saw plenty of thunderstorms, only 2 in my memory approach a "typical" severe thunderstorm after we moved to the Dallas-Fort Worth area.

I'm pretty sure the marine cooled air weakens a lot of storms that were severe back further West. You need a decent WSW wind to keep the Atlantic from killing low level instability. OTOH, the apparent tornadic cell just outside Boston involved a severe storm crossing a shallow sea breeze boundary, judging from discussions on that sub-forum yesterday.

Going to Catholic school and hating it, I always felt I was in a screw zone when snow would change to rain City and islands, although February 1978 and an entire week missed is a memory I cherish to this day...

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Depending on the exact track and intensity of this Pac NW shortwave which ejects eastward, we could see significant and/or widespread severe weather across the Northern 1/3 of the country even from the Great Lakes into the Northeast Days 7-9. The SPC has already highlighted some areas in the Days 7-8 outlook for significant severe.

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I probably picked up less than .5 inches yesterday. Had a quick downpour, some lightning and thunder. Hoping that maybe tommorow morning delivers but we'll see i guess

Upton says just rain tonight and Friday.

MODELS CONTINUE TO BE IN GENERAL AGREEMENT WITH SHORTWAVE ENERGY

CURRENTLY IN THE LOWER GREAT LAKES REGION TRACKING TOWARDS THE

AREA TONIGHT. THE DISAGREEMENT LIES WITH HOW FAR NORTH THE PRECIP

SHIELD GETS WITH AN INCREASING ELY FLOW...MOISTURE ADVECTION AND

UPSLOPE EFFECTS BATTLING HIGH PRES TO THE N. NAM MASS FIELDS

APPEARED TO BE THE MOST IN LINE AND SIDED MOSTLY WITH ITS SOLN

WITH HIGHEST RAINFALL AMOUNTS ACROSS SW PORTIONS OF THE AREA.

PWATS AROUND 1.5 INCHES THIS AFTN...WILL INCREASE BACK TO AROUND 2

INCHES BY FRI MORNING. SFC BASED INSTABILITY WILL REMAIN S OF THE

AREA AND DO NOT SEE ANY INDICATIONS OF ELEVATED INSTABILITY

PRESENT TONIGHT OR FRI SO NO THUNDER HAS BEEN INCLUDED. PERIODS OF

MODERATE RAINFALL IS POSSIBLE. SEE HYDRO SECTION FOR MORE INFORMATION.

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Reading the paper looks like isotherms area got hit hard again.....great year for him

Yeah Red Bank had some hail, and winds were pretty strong through Holmdel as well. In my immediate area we had a ton of thunder/lightning but not much else. Only 0.06" of rain yesterday. The cell passed just to my north.

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12z GFS would indicate severe potential across portions of the northeast around a week out, with a fairly robust shortwave tracking eastward across roughly the Canadian border. Synoptically, it actually looks rather impressive, although to take a single run at this point would be asinine.

Edit: Euro shows the same thing and CMC is similar as well.

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Upton aternoon update :

SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/

A PRE-FRONTAL TROUGH SHOULD DEVELOP DURING THE DAY ON MON IN

RESPONSE TO STRONG HEATING AND THE APPROACH OF A MID LEVEL

DISTURBANCE...WHOSE TIMING SHOULD BE A NAM/GFS COMPROMISE.

EXPECT CONVECTIVE TEMPS TO BE REACHED POSSIBLY AS EARLY AS

MIDDAY...WITH DEVELOPMENT OF ISOLD CONVECTION A EARLY AS MIDDAY

ANYWHERE FROM NORTH/WEST...THEN MORE ORGANIZED CONVECTION AFTER

ABOUT 18Z VIA DIFFERENTIAL OROGRAPHIC HEATING IN THE HILLS WELL TO

NORTH/WEST...SPREADING TOWARD THE COAST VIA MEAN ESE 0-6 KM FLOW

OF ABOUT 20 KT. WITH MLCAPE 1500 J/KG AND 0-3 KM SHEAR VECTORS UP

TO 35 KT GENERATED VIA 25-KT SW LOW LEVEL FLOW VEERING NW WITH

HEIGHT...EXPECT A FEW STORMS TO BE SEVERE FROM NYC METRO

NORTH/WEST...WITH STRONG WINDS AND HAIL. HEAVY RAIN AND FREQUENT

LIGHTING SHOULD ALSO BE HAZARDS...BUT IT IS UNCLEAR HOW MUCH OF A

FLASH FLOOD THREAT EXISTS...WITH THE NAM NOT QUITE AS WET AS THE

GFS...SOMEWHAT DRIER IN THE MID LEVELS...AND WITH FASTER CORFIDI

VECTORS.

HIGH TEMPS ON MON SHOULD BE 85-90...HOTTEST IN NYC AND URBAN NE

NJ. ENHANCED MIXING INVOF NYC SHOULD HELP LOWER AFTERNOON

DEWPOINTS OUTSIDE OF ANY CONVECTION TO THE MID 60S...KEEPING MAX

HEAT INDICES IN THE LOWER 90S...SO WILL NOT ISSUE HEAT ADVY FOR

NYC.

CONVECTIVE THREAT SHOULD SHIFT MORE TO CT/LONG ISLAND MON NIGHT...BUT

WITH ANOTHER APPROACHING SHORTWAVE PER 12Z GFS/ECMWF AND POSSIBLE

RECHARGING OF INSTABILITY IN THE WAKE OF THE INITIAL STORMS...KEPT

CHANCE POP GOING ACROSS THE ENTIRE CWA FOR MON EVENING...THEN

TAPERING TO SLIGHT CHANCE AFTER MIDNIGHT.

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Pretty decent lightning with the storm over rockland.

Yup, skunked this morning, first lost tee time of the year. Funny thing, there was plenty of lightning in the air and the detection system wasn't going off so a few morons got on the tee box for the first hole, hit their shots, then CRACK, right over the club house, the alarm goes off, and they come running back. Morons.

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Yup, skunked this morning, first lost tee time of the year. Funny thing, there was plenty of lightning in the air and the detection system wasn't going off so we got on the tee box for the first hole, hit our shots, then CRACK, right over the club house, the alarm goes off, and we come running back. Morons.

FIXED

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