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May 2011 NYC metro area obs./discussion


Snowlover11

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I noted this in my afd last night for the website, but the problem is not the instability, it's the lack of kinematic support. The 0-6km and effective shear is lacking completely, most near term models have it below 20 kts now. There's very little to support organized convection this afternoon--we're going to need the shortwave itself to be more robust to maintain severe updrafts. The instability and thermodynamic support is fine--but it won't be an organized severe weather event without the required kinematics.

It looks like effective bulk shear is decent right now though, is this forecast to weaken somewhat?

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The westerly wind component is such a beast this time of year--almost as much as the marine flow. Look at the 80 F temps all the way to the jersey beaches

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The text soundings off 3 hour NAM brings all of us up to almost 85 degrees. We cant see in between hours, so it's posible that its a little higher.

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Looks like Earthlight is spot on about the shear, however things still look favorable for some severe weather this afternoon per this latest from Mt. Holly's 11AM update...

.NEAR TERM /UNTIL 6 PM THIS EVENING/...

-- Changed Discussion --THE FIRST MID LEVEL IMPULSE WAS APPROACHING LATE THIS MORNING, AND

IT WAS CAUSING SHOWER ACTIVITY FROM THE SOUTHERN POCONOS TO

CENTRAL DELAWARE AND THE MARYLAND EASTERN SHORE. THE SOUTHERN

ACTIVITY WAS WEAKENING AND THE NORTHERN ACTIVITY WAS MAINTAINING

ITSELF. AS NOTED BY THE PREVIOUS FORECASTER, THIS IMPULSE SHOULD

CLEAR THE AREA EARLY THIS AFTERNOON. THERE LIKELY WILL BE A BREAK

IN THE ACTION INTO THE MID AFTERNOON HOURS, AFTER WHICH TIME THE

SECOND IMPULSE APPROACHES. AN ASSOCIATED UPPER LEVEL JET IS

PROGGED TO BE IN A FAVORABLE PLACE BY THE 12Z NAM. A MODIFIED IAD

SOUNDING SHOWS PLENTY OF INSTABILITY (REACHABLE FROM THE SURFACE,

MODERATE AT MID LEVELS AND RESIDING TO SOME DEGREE IN THE HAIL

GROWTH REGION) AND A DECENT AMOUNT OF MOISTURE AVAILABLE THIS

AFTERNOON. WE DID USE VERY WARM MAX TEMPERATURES WHEN MODIFYING

THE SOUNDING TO MATCH OUR FORECAST FOR OUR SOUTHERN ZONES, BUT

MARGINALLY COOLER TEMPERATURES NORTH DO NOT DROP INSTABILITY TO

NEGLIGIBLE VALUES. SHEAR IS MORE OF THE SPEED THAN DIRECTIONAL

TYPE. STRONG WIND GUSTS AND HAIL IN THE WORST THUNDERSTORMS REMAIN

POSSIBLE, AND SPC KEEPS OUR AREA IN A SLIGHT RISK. THE BASIC TENOR

OF THE MID TO LATE AFTERNOON FORECAST IS MAINTAINED. THE

TEMPERATURE FORECAST ALSO LOOKS GOOD, ALTHOUGH THE MORNING SHOWERS

WILL DAMPEN THE TEMPERATURE RISE TEMPORARILY.-- End Changed Discussion --

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If earthlight or Isotherms made a thread about my shirt,pants, and underwear being soaking wet bet 11am on Tuesday they would have been right

Hot as hell here Tim and now mostly sunny 80/66.

Visible shows clouds breaking up everywhere.

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