Long Island Winter Storm Command Center
Tactical winter weather intelligence for Suffolk and Nassau Counties. High-resolution snow-to-liquid ratios, 40°N / 70°W Nantucket benchmark nor'easter tracking, elevation moraine rain/snow lines, and PSEG power grid outage risk models.
Weather Prediction Center Winter Storm Severity Index evaluates rate, blowing snow, and ice glaze impact.
The geographic tipping point south of Nantucket where storm passage dictates rain vs. crippling blizzard.
1 inch liquid = 10 inches snow. Maritime Atlantic air keeps Long Island snow wet, heavy, and cement-like.
Zero heavy snow loading on oak/pine tree canopy. No high-wind branch failure or transmission tripping.
The 40°N / 70°W "Nantucket Benchmark" Track Modeler
Explore how a 25-mile shift in storm center track completely transforms Long Island winter precipitation.
The low center passes directly over 40.0° N, 70.0° W. The northwest quadrant of the nor'easter locks over Long Island, delivering 3-5"/hr mesoscale snowbands, sustained 40-50 mph winds, and zero-visibility whiteouts.
East Coast Winter Radar & P-Type
Probabilistic Snowfall Guidance
NWS Upton automatically publishes live probabilistic snowfall graphics (Expected 50th %, High-End 90th %, and Low-End 10th %) whenever a Winter Storm Watch or Warning is initiated for Long Island. Currently, quiet seasonal conditions prevail.
Official NWS Upton Most Likely (50th percentile) snowfall accumulation across Long Island.
Elevation Rain/Snow Battleground Matrix
Highest elevation on Long Island locks in sub-freezing air earlier, maximizing snow accumulation during coastal transition events.
Sharpest accumulation gradients on the island. Transition line frequently stalls along Exits 49–64 of the LIE.
Porous sandy soil and dense pitch pine canopy drop surface temps 5–10°F below surrounding towns on clear calm nights.
Onshore winds off 42-46°F ocean water frequently suppress snowfall into rain or slush within 2 miles of the Atlantic.
Snow Weight & PSEG Outage Risk Calculator
Most residential roofs are rated for 30 lbs/sq ft. Ice damming and secondary rain over snow can double this load.
Heavy wet snow sticks to unpruned deciduous branches, bowing them into primary 13.2 kV distribution lines.
Roadway, Transit & Bridge Winter Status
Long Island School Closings & Snow Day Predictor
Automated monitoring across Suffolk and Nassau County school districts with delay probability analytics.
Pavement temperatures well above freezing with zero travel hazards across Suffolk and Nassau counties.