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Tuesday/Wednesday Storm


CT Rain

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Fantastic update explaining all the damage potential. This is what we used to get from Drag . Whoever wrote this great job and hopefully other mets at BOX will follow suit

1030 AM UPDATE...

...SEVERE WEATHER THREAT...

EVALUATING SATELLITE TRENDS AM CONCERNED BREAKS IN THE CLOUDS S OF

NEW ENGLAND WILL ALLOW FOR SFC BASED INSTABILITY VALUES OF AROUND

500 J/KG WITHIN A CONDITIONALLY UNSTABLE AND HIGHLY SHEARED

ENVIRONMENT. MONITORING SPC MESOANALYSIS AND MESORUC/HRRR CLOSELY

FOR FCST EVOLUTION. FOR LOCALES AROUND THE CT VLY AND WRN NEW

ENGLAND...IT IS PLAUSIBLE TO SEE LOW-TOPPED CONVECTION /SQUALLS

AND DISCREET CELLULAR IN NATURE/ TO DEVELOP WITH ENOUGH INSTABILITY

AND SHEAR TO RESULT IN SUSTAINED ROTATING UPDRAFTS...SO ALONG WITH

THE DAMAGING WIND THREAT THERE IS THE POSSIBILITY FOR ISOLATED

TORNADOES /WELL-DEFINED RIGHT TURNING HODOGRAPH PROFILES WITH

STRONG HELICITY VALUES AT BOTH 0-1 TO 0-3 KM/. AGAIN...THIS THREAT

ARISES ESPECIALLY IF THE SUN IS ALLOWED TO PEEK AND INSTABILITY IS

ALLOWED TO BUILD. ALREADY THERE IS SOME HINT AT CONVECTION

DEVELOPING OVER THE LOWER HUDSON RVR VLY. OVERALL...THE DAMAGING

WIND THREAT PREVAILS...AND FOR THAT PLEASE SEE THE WINDS SECTION

BELOW.

A FINAL NOTE...SOME PRELIMINARY THINKING...IN AGREEMENT WITH THE

PREV FCST DISCUSSION FOR THE EVNG PD WITH THE POTENTIAL FOR A

NEAR-FRONTAL SQUALL LINE WITH A LOW INSTABILITY/HIGH SHEAR

ENVIRONMENT. THE ANTICIPATED CONVECTIVE LINE WILL HAVE THE GREATER

PROPENSITY OF PRODUCING A SHORT-FUSED DAMAGING WIND EVENT. WILL

OUTLINE THE THREATS IN

...WINDS...

ALREADY OBS ACROSS THE BERKSHIRES ARE REPORTING GUSTS AROUND 35

MPH WITH HEAVIER RAINS. VERTICAL WIND PROFILERS WEST OF NEW ENGLAND

ARE REPORTING H925 WINDS AROUND 40 KTS /50 MPH/. THE AXIS OF

STRONGEST WINDS BEGINS TO PUSH INTO WRN NEW ENGLAND IN THE NEXT HR

OR TWO INTO THE MIDDAY TIMEFRAME WITH SPEEDS AROUND 50 KTS /60

MPH/ ANTICIPATED. SHOULD THE SUN BREAK OUT...THERE IS A GREATER

POSSIBILITY FOR LOW-LVL MIXING OF FASTER MOMENTUM ALOFT TO THE

SFC. NEVERTHELESS...A CONDITIONALLY UNSTABLE ENVIRONMENT...AND

ALSO NOTING THE AFOREMENTIONED POCKETS OF HEAVIER RAIN DRAGGING

FASTER MOMENTUM TO THE SFC...THE WIND ADVISORY PREVAILS WITH THE

EXPECTATION FOR STRONG TO DAMAGING GUSTY WINDS AS THE JET

INCREASES ALOFT AT 2-3 KFT. IT IS POSSIBLE THAT HIGH WINDS COULD

REACH THE SFC WITH GUSTS UP TO 60 MPH WITH THE ENCROACHING FASTER

JET AND MOMENTUM MIX-DOWN BY AFOREMENTIONED PROCESSES...BUT FEEL

SUCH GUSTS WILL BE ISOLATED WITH MUCH OF THE GUSTS REMAINING

WITHIN WIND ADVISORY CRITERIA. HIGHER TERRAIN LOCALES ABOVE 1 KFT

WILL HAVE THE GREATER POSSIBILITY FOR HIGH WINDS. THE JET WILL

ENHANCE INTO THE EVNG PD PARENT WITH THE APPROACH OF THE SFC COLD

FRNT.

.

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Really need 40 knot gusts to start talking about damage and I haven't seen that yet on local METARs. We'll see what develops though through the afternoon as mixing depth improves a bit and LLJ increases.

Yeah the jet doesn't really get cranking until a bit later. It strengthens and tightens considerably after 00z but we'll likely be relying on precip drag moreso by that point

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Yeah the jet doesn't really get cranking until a bit later. It strengthens and tightens considerably after 00z but we'll likely be relying on precip drag moreso by that point

Yeah that's why I sort of liked western areas and NYC metro for strongest winds. Mixing should be a bit better by 00z.

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I really like the Delmarva right now with those temps in the low 80s..Anyone else a little surprised the mod risk was not included to the se NJ coast where some of the more notable surface instability resides? I suppose the better forcing and the peak 850 mb jet is forecast just to the west, but the nam has the best 925mb jet winds of 50-60kts peaking over coastal NJ 18z-00z.. over the better instability.

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