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Upstate NY/North Country + adjacent ON, QC, VT: Meteorological fall is here


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-- Changed Discussion --WV IMAGERY TELLS THE STORY THIS MORNING AS IT CONTINUES TO SHOW A STACKED SURFACE/UPPER LEVEL LOW SPINNING OVER SOUTHERN ONTARIO WITH AN ABUNDANCE OF MOISTURE WRAPPED AROUND THE CENTER MAKING ITS WAY INTO THE NIAGARA FRONTIER AT THIS TIME. ANOTHER PLUME OF MOISTURE AHEAD OF THE LOW IS SEEN MOVING UP THE EASTERN SEABOARD AND INTO NEW YORK FROM THE FINGER LAKES EAST. A WELL-PRONOUNCED...BUT SHRINKING DRY SLOT CAN BE SEEN IN BETWEEN THESE TWO AREAS OF MOISTURE ACROSS FAR WESTERN NEW YORK. EVEN ACROSS THIS REGION OF DRIER AIR VISIBLE SATELLITE REVEALS PLENTY OF DIURNAL STRATO-CU DEVELOPMENT TAKING PLACE AT THIS TIME. THE MOST IMPRESSIVE FEATURE THIS MORNING HOWEVER IS A LINE OF HEAVIER SHOWERS MAKING ITS WAY ACROSS CENTRAL LAKE ERIE WITH A CLEARLY DEFINED LAKE ENHANCEMENT SIGNATURE...NOT SURPRISING GIVEN THE WELL-ALIGNED SOUTH-SOUTHWESTERLY FLOW ALOFT AND +10C TEMPS ALOFT AS COMPARED TO THE ANOMALOUSLY WARM LAKE TEMPS OF +24C. THIS FEATURE IS ALSO BEING AIDED BY A VORTMAX ALOFT AS SEEN ON WV IMAGERY.

FOR THE REST OF TODAY...EXPECT ISOLATED TO SCATTERED SHOWERS TO DEVELOP ACROSS THE NIAGARA FRONTIER AND FAR WESTERN NEW YORK AS THE VORTMAX PUSHES EAST INTO THE REGION. WHILE THE HEAVIEST ACTIVITY WILL LIKELY HOLD OFF UNTIL THIS EVENING WHEN THE FLOW REALLY VEERS TO THE SOUTHWEST AND THE LAKE ENHANCEMENT KICKS INTO GEAR...IT IS STILL POSSIBLE FOR LOCATIONS ACROSS THE AREA TO PICK UP A FEW HUNDREDTHS OF AN INCH. FARTHER EAST...LOOK FOR INCREASING INSTABILITY WITH SFC-BASED CAPES APPROACHING 1000 J/KG THIS AFTERNOON ALLOWING FOR SCATTERED SHOWERS ALONG WITH A FEW THUNDERSTORMS TO FIRE OFF ACROSS THE NORTH COUNTRY. IN BETWEEN THESE TWO REGIONS...THE AFOREMENTIONED DRY SLOT SHOULD KEEP ACTIVITY LIMITED TO AN ISOLATED SHOWER OR TWO ACROSS THE GENESEE VALLEY AND FINGER LAKES...WITH PARTLY SUNNY SKIES. TEMPERATURES TODAY WILL RANGE FROM THE UPPER 60S TO LOWER 70S ACROSS FAR WESTERN NEW YORK WHERE THE COOLER TEMPERATURES ALOFT...CLOSER TO THE UPPER LOW CENTER. THE WARMER READINGS THAT MAY CRACK INTO THE LOWER 80S WILL BE FOUND FROM THE FINGER LAKES EAST WHERE MORE SUNSHINE AND SLIGHTLY WARMER TEMPERATURES ALOFT MAY ALLOW TEMPERATURES TO CRACK THE 80 DEGREE MARK

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The spc has most of the state east of SYR in a moderate risk for tomorrow. Instability will be limited given dew points in the mid 60s and not very steep mid level lapse rates, but good dynamics in the right entrance region of the 300 mb jet may offset the lower CAPE. The nam is more negatively tilted and slower with the trough at 500 mb than the gfs, probably because of a stronger jet upstream. The setup of the gfs would be much less favorable for significant severe weather with an earlier passage of the front, less instability and weaker low level directional shear.

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SSE winds at 925 mb would favor the valley regions and western hills of the capital district for tornado producing supercells. The 15z SREF seems quite bullish about the supercell threat ahead of the main mcs with 0-3 km helicity >200 probabilities near 90% in the mid hudson valley and cape > 500 j/kg probabilities also around 90%.

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The spc has most of the state east of SYR in a moderate risk for tomorrow. Instability will be limited given dew points in the mid 60s and not very steep mid level lapse rates, but good dynamics in the right entrance region of the 300 mb jet may offset the lower CAPE. The nam is more negatively tilted and slower with the trough at 500 mb than the gfs, probably because of a stronger jet upstream. The setup of the gfs would be much less favorable for significant severe weather with an earlier passage of the front, less instability and weaker low level directional shear.

EC is like the NAM too and it looks like the UK may be leaning that way as well especially as it rates to negative tilting of the trough aloft. GFS is woefully low on the LP too. The forecast track along the SLRV with deepening is classice for severe weather and/or strong synoptic winds (esp fall thru spring).

SSE winds at 925 mb would favor the valley regions and western hills of the capital district for tornado producing supercells. The 15z SREF seems quite bullish about the supercell threat ahead of the main mcs with 0-3 km helicity >200 probabilities near 90% in the mid hudson valley and cape > 500 j/kg probabilities also around 90%.

Actually the SSE wind in the Lowest levels favors spinups in the Hudson Valley and could also favor development X the Catskill Creek Basin with cells moving out of it (and off the EAST slopes of the Catskills) and heading up towards SVT the Taconics and the Berkshires. It is the rapid veering of winds in the lowest 0.5-1Km that will cause the potential tornadic supercells but these will actually be in the HV and then move towards the higher terrain to the east of it.

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