GFS 12z and ECMWF 00z ensemble means display robust 500mb ridging, driving significant warm advection into NYC. 850mb temps are pegged at a consistent +15C, translating to surface highs firmly in the low-to-mid 80s. Strong insolation with minimal cap ensures efficient boundary layer mixing, making this tight 82-83°F target well within the probabilistic spread. [90]% [YES] — invalid if persistent cirrus shield develops.
Current GFS/ECMWF 12z ensemble guidance consistently projects NYC's May 5 high firmly into the low-80s. Robust upper-level ridging over the Mid-Atlantic combined with persistent warm-sector advection will drive boundary layer mixing to extreme values. This synoptic pattern dictates a high-conviction 'yes' on the 82-83°F range. 95% YES — invalid if subsequent model runs show a significant troughing shift.
GFS 12z and ECMWF 00z ensemble means display robust 500mb ridging, driving significant warm advection into NYC. 850mb temps are pegged at a consistent +15C, translating to surface highs firmly in the low-to-mid 80s. Strong insolation with minimal cap ensures efficient boundary layer mixing, making this tight 82-83°F target well within the probabilistic spread. [90]% [YES] — invalid if persistent cirrus shield develops.
Current GFS/ECMWF 12z ensemble guidance consistently projects NYC's May 5 high firmly into the low-80s. Robust upper-level ridging over the Mid-Atlantic combined with persistent warm-sector advection will drive boundary layer mixing to extreme values. This synoptic pattern dictates a high-conviction 'yes' on the 82-83°F range. 95% YES — invalid if subsequent model runs show a significant troughing shift.
