Long Island Weather Logo
Long Island Weather
Suffolk & Nassau Command
--:--:--
Station #212066 • °F / MPH Live
LINY Weather Academy & Training Program 6-Module Citizen Forecaster Curriculum (18 Exam Questions)

Long Island Weather 101 & Forecaster Certification

Use this page either as a Long Island meteorology field manual or as a complete self-paced training course. Study each module's full lesson material, test real data in the interactive METAR & Snowfall labs, and pass all 6 module exams (3 questions each) to earn your LINY Citizen Forecaster Certificate.

Course Progress 0 / 6 Certified
Pass all 6 module exams to unlock
Jump to: Mod 01 Mod 02 Mod 03 Mod 04 Mod 05 Mod 06 Interactive Labs Glossary (20) Station #212066
MODULE 01 15 min read • 3 Lessons + Exam

Long Island Microclimate Physics & Glacial Geography

Why Terryville, the Central Pine Barrens, and Montauk can differ by 15°F–20°F on the exact same night.

0 / 3 Exam Passed

1.1 Glacial Moraines & Terrain Elevation

Long Island was sculpted roughly 20,000 years ago by the Laurentide Ice Sheet, leaving two parallel east-west ridges: the Harbor Hill Moraine (along the North Shore bluffs) and the Ronkonkoma Moraine (running through the central spine from Farmingdale to Montauk). South of the Ronkonkoma Moraine lies a flat glacial outwash plain of coarse sand and gravel sloping gently toward the Great South Bay. Even 150–300 feet of elevation along the moraine spine—combined with distance from the water—creates measurable differences in daytime highs, snowfall accumulation, and wind exposure.

1.2 Pine Barrens Radiational Cooling & Frost Hollows

On clear, calm nights after a dry Canadian high-pressure system settles overhead, the ground loses heat to space via infrared radiation. Urban Nassau County (concrete/asphalt) and coastal towns (surrounded by 50°F–70°F water) hold onto warmth. By contrast, the Central Pine Barrens (Manorville, Westhampton, Shirley, Calverton) sit atop dry, coarse quartz sand with low thermal mass and sparse moisture. Cold, dense air pools in low-lying river valleys and bogs—creating "frost hollows" that routinely drop 10°F–20°F colder than Islip (KISP) or Port Jefferson by dawn.

1.3 Sea-Breeze Fronts & Sound-vs-Atlantic Collision

From April through August, Long Island land heats up much faster than the surrounding Atlantic Ocean and Long Island Sound. Warm air rises inland, drawing cooler marine air onshore from the south (Atlantic) and the north (Sound). Because Long Island is only 12–23 miles wide, those two opposing sea breezes frequently collide right along the Long Island Expressway (I-495) spine between Hicksville, Ronkonkoma, and Coram. That convergence boundary lifts warm, humid air and can trigger pop-up afternoon downpours or isolated thunderstorms even when no large front is nearby.

Real-World Example: On a calm, clear October night with light north winds (<3 mph), Montauk Point (water-moderated) might bottom out at 49°F, Port Jefferson Harbor at 45°F, Terryville on the moraine at 40°F, and Westhampton (KFOK) in the Pine Barrens at 29°F with heavy frost—all within a 50-mile drive.
MODULE 02 18 min read • 3 Lessons + Exam

Decoding Doppler Radar (KOKX) & Aviation METARs

How to read NWS Upton radar reflectivity, velocity couplets, bright banding, and airport METAR reports.

0 / 3 Exam Passed

2.1 NEXRAD WSR-88D Radar Physics & Beam Overshoot

Long Island’s primary Doppler radar is KOKX, located at NWS Upton in Brookhaven. The radar dish rotates 360° and fires microwave pulses at multiple elevation tilts, starting at 0.5° above the horizon. Because the Earth curves away beneath a straight radar beam, the 0.5° beam climbs higher with distance—around 1,500 ft over Islip, 3,500 ft over JFK, and over 5,500 ft near Montauk. That means shallow coastal drizzle or lake/sound-effect snow bands far from Upton can pass completely underneath the radar beam.

2.2 Reflectivity (dBZ), Base Velocity & Bright Banding

Base Reflectivity (dBZ) measures how much radar energy bounces back from raindrops, snowflakes, or hail. In winter, watch out for "Bright Banding": when falling snowflakes hit a 32°F+ warm layer aloft and become coated in liquid water, they reflect radar energy like giant raindrops—producing a false 45+ dBZ ring on radar even when precipitation at the ground is light. To verify severe wind or rotation, switch to Base Velocity: green pixels show air moving toward Upton, red pixels show air moving away, and a tight green-next-to-red couplet signals dangerous rotation.

2.3 Reading Raw Aviation METARs (KISP, KJFK, KFOK)

Airports across Long Island broadcast standardized hourly weather observations called METARs. Every group follows a strict order: Station ID (e.g., KISP for MacArthur Airport), Day + UTC/Zulu Time (e.g., 131856Z = 13th day at 18:56 UTC), Wind Direction/Speed in knots (e.g., 04018G28KT = from 040° NE at 18 kt gusting 28 kt), Visibility in statute miles (10SM or 1/2SM), Present Weather (+SN = heavy snow, -RA = light rain, BR = mist, FG = fog), Cloud Layers in hundreds of feet (FEW025 = few at 2,500 ft; BKN/OVC = official ceiling), Temperature/Dew Point in °C (M02/M03 = -2°C / -3°C), and Altimeter pressure in inches of mercury (A2992 = 29.92 inHg).

Field Tip: When KISP reports "+SN FZFG VV005", visibility has dropped with heavy snow (+SN) and freezing fog (FZFG), and the sky is completely obscured with a vertical visibility (VV) of just 500 feet—classic whiteout blizzard conditions.
MODULE 03 20 min read • 3 Lessons + Exam

Nor’easters, Miller-A/B & The 40°N/70°W Benchmark

Master Long Island winter storm forecasting: storm tracks, 850mb warm noses, bombogenesis, and snow-to-liquid ratios.

0 / 3 Exam Passed

3.1 Anatomy of a Nor’easter & Bombogenesis

Because air circulates counter-clockwise around a low-pressure center in the Northern Hemisphere, a storm tracking off the Mid-Atlantic and Southern New England coast pulls strong, persistent winds from the northeast across Long Island—hence "Nor’easter." The East Coast is a prime breeding ground because frigid continental air from Canada collides with the 70°F+ Gulf Stream just offshore. When a coastal low’s central barometric pressure drops by at least 24 millibars in 24 hours, meteorologists classify it as "Bombogenesis" (a bomb cyclone), producing hurricane-force coastal gusts and 2–3 inch/hour snowfall rates.

3.2 Miller-A vs. Miller-B Tracks & The 40°N/70°W Benchmark

Forecasters group East Coast snowstorms into two classic families. A Miller-A storm forms in the Gulf of Mexico or off Georgia and tracks straight up the coastline—often delivering Long Island’s cleanest, heaviest all-snow blizzards. A Miller-B storm starts west of the Appalachians (Ohio Valley) and must "redevelop" or transfer its energy to a secondary low off Delmarva; because the primary inland low pumps mild ocean air north first, Miller-B storms frequently bring a messy rain/sleet/snow battleground to Nassau and Suffolk. For any track, the 40°N, 70°W coordinate (about 70 miles south of Nantucket/Montauk) is the gold-standard benchmark: passing near or just southeast of 40°N/70°W keeps Long Island in the cold northwest quadrant for maximum snow.

3.3 The 850mb Warm Nose & Snow-to-Liquid Ratio (SLR)

Snowfall at the ground depends on the entire vertical column of air, especially the 850 mb level (~5,000 ft altitude). If 850 mb temperatures stay below 0°C (32°F) while the surface is freezing, precipitation falls as pure snow. If a warm nose (>0°C) intrudes at 850 mb, snow melts into rain aloft: if the surface layer is deep and cold enough, it refreezes into sleet (ice pellets); if the cold surface layer is shallow, it hits the ground as freezing rain (glaze ice). Meanwhile, Snow-to-Liquid Ratio (SLR) determines snow weight: 1.00 inch of liquid water yields 6–8 inches of heavy, wet coastal slush near 33°F (snapping tree limbs and power lines), versus 12–15+ inches of dry, fluffy powder when temperatures sit in the low 20s.

Track Sensitivity Rule: On Long Island, a storm track shift of just 35 miles northwest (inside the 40°N/70°W benchmark toward Montauk) can pull 38°F Atlantic air over the South Shore and cut a 12-inch snow forecast down to 3 inches of slush and rain.
MODULE 04 15 min read • 3 Lessons + Exam

Marine Fetch, Tides, Currents & Inlet Wave Physics

Why Long Island Sound builds steep 3-second chop while South Shore inlets stack up dangerous breaking bars.

0 / 3 Exam Passed

4.1 Fetch-Limited Waves: Long Island Sound vs. Open Atlantic

Wave height depends on three factors: wind speed, wind duration, and "fetch"—the uninterrupted distance of open water over which the wind blows. Long Island Sound is only 15–20 miles wide north-to-south, so a 25-knot north or south wind is "fetch-limited," producing short-period (3–4 second), steep, uncomfortable chop. However, if an east-northeast gale blows straight down the Sound’s full 110-mile east-west axis from Block Island toward Execution Rocks, waves have plenty of room to grow into 6–9 ft breaking seas. On the South Shore, the open Atlantic offers hundreds of miles of fetch, generating long-period (10–14 second) groundswell even when local winds are calm.

4.2 Ebb Tide vs. Onshore Swell at South Shore Inlets

Long Island’s South Shore inlets—Fire Island, Jones, Moriches, and Shinnecock—funnel billions of gallons of tidal water through narrow channels every 6 hours. When an outgoing (ebb) tidal current rushes seaward at 3–5 knots directly against an incoming Atlantic ocean swell, the opposing current slows the wave’s forward speed. Because wave energy is conserved, the wavelength compresses and the wave height stacks vertically—turning an ordinary 4-foot ocean swell into a steep, pitching 7–9 foot breaking bar across the inlet mouth.

4.3 Astronomical King Tides & Coastal Storm Surge

Normal tides follow the moon: New and Full Moons align the sun, moon, and Earth to create higher "Spring Tides," and when the moon is at perigee (closest to Earth), Long Island experiences "King Tides" adding 1–2 feet above normal high tide. Storm Surge is extra water pushed ashore by wind stress and low barometric pressure. On Long Island, a persistent East or East-Northeast wind traps water inside Western Long Island Sound (Kings Point/Port Washington) and pushes water through South Shore inlets into Great South Bay—causing moderate street flooding in Lindenhurst, Freeport, and Patchogue even from a modest storm if it peaks at high tide.

Boater Rule of Thumb: Before transiting Fire Island or Shinnecock Inlet in a small craft, always check BOTH the NOAA buoy swell period/height and the tide stage. A 4-ft @ 9s swell on an incoming flood tide is usually manageable; the exact same swell on max ebb can close the inlet.
MODULE 05 15 min read • 3 Lessons + Exam

Severe Storms, Lightning Safety & Atmospheric Optics

Understanding CAPE instability, bow echoes, the 30-30 lightning rule, and "Fire Sky" sunset physics.

0 / 3 Exam Passed

5.1 Convective Ingredients & Long Island’s Marine Stabilizer

Severe thunderstorms require four ingredients (SLIM): Shear (wind changing speed/direction with height), Lift (a cold front or sea-breeze boundary), Instability (CAPE measured in Joules/kg), and Moisture (dew points >= 60°F–65°F). In summer, storms crossing New Jersey and the Hudson Valley often encounter Long Island’s cooler marine boundary layer—which can weaken surface-based tornadoes—but strong cold-front squall lines ("bow echoes") can still punch through with 55–70 mph straight-line wind gusts and heavy tree damage across Nassau and Suffolk.

5.2 Lightning Physics & The 30-30 Safety Protocol

Light travels almost instantaneously, while thunder travels roughly 1 mile every 5 seconds. Counting the seconds between a flash and thunder and dividing by 5 gives the storm’s distance in miles ("Flash-to-Bang"). Because lightning can strike 10+ miles ahead of the rain shaft ("bolts from the blue"), NWS recommends the 30-30 Rule: if the flash-to-bang time is 30 seconds or less (lightning within 6 miles), move indoors immediately to an enclosed building or hard-topped metal vehicle, and wait 30 minutes after the final thunderclap before returning to beaches, docks, or fields.

5.3 Atmospheric Optics: "Fire Sky" Sunsets, Halos & Virga

At sunset, sunlight passes through a much thicker slice of atmosphere, scattering away short blue wavelengths and leaving long red, orange, and magenta wavelengths. The most dramatic Long Island "Fire Sky" sunsets occur when a clear western horizon lets low-angle red light illuminate high-altitude cirrus or altocumulus clouds (15,000–25,000 ft) overhead. Similarly, a glowing 22° ring (halo) around the sun or moon is caused by sunlight refracting through hexagonal ice crystals in high cirrostratus clouds—often signaling an approaching warm front and rain within 12–24 hours.

Summer Marine Cap Example: On a 90°F day in NYC/Newark with 2,500 J/kg CAPE, storms may erupt across NJ—yet as they cross the 72°F Atlantic breeze onto Long Beach or Fire Island, the cool marine layer stabilizes the lowest 1,000 ft and weakens the storms before they reach Suffolk.
MODULE 06 15 min read • 3 Lessons + Exam

Personal Weather Station Engineering & NWS Alert Protocols

Inside Tempest Station #212066’s solid-state sensors, WMO siting standards, and NWS Watch vs. Warning protocols.

0 / 3 Exam Passed

6.1 Solid-State Telemetry (Tempest Station #212066)

Traditional mechanical weather stations rely on spinning anemometer cups (which freeze in ice storms) and tipping-bucket rain gauges (which clog with leaves and under-count torrential downpours). LINY Weather’s primary station (Tempest #212066 in Terryville/Port Jefferson Station) uses solid-state sensors with zero moving parts: four ultrasonic transducers measure wind speed and direction every 3 seconds by timing sound waves across a gap, while a piezoelectric haptic plate detects the acoustic impact of individual raindrops. A built-in RF sensor tracks electromagnetic pulses from lightning strikes up to 25 miles away.

6.2 WMO Siting Physics & Sea-Level Pressure Reduction

Even an expensive sensor gives bad data if sited poorly. World Meteorological Organization (WMO) standards place thermometers 5 feet (1.5 m) above natural grass or turf inside a ventilated white radiation shield, far from dark asphalt driveways or heat-radiating south walls. Anemometers are ideally mounted 33 feet (10 m) above ground in open exposure; suburban trees create wind shadow that can cut recorded gusts by 20%–40%. Finally, stations convert raw "station pressure" (which drops with elevation) to "Sea-Level Pressure" (SLP) so you can compare barometers fairly from Montauk to Manhattan.

6.3 NWS Upton (OKX) Watch, Advisory & Warning Protocols

Official alerts for Nassau and Suffolk Counties are issued by NWS New York, NY (Upton, OKX). Understanding the hierarchy prevents both complacency and unnecessary panic: a Hazardous Weather Outlook (HWO) flags potential 2–7 days out; a WATCH means atmospheric ingredients are favorable within 12–48 hours (prepare supplies and plans); an ADVISORY means nuisance or moderate hazards are expected (use caution, e.g., Winter Weather Advisory or Wind Advisory); and a WARNING means life- or property-threatening weather is imminent or already occurring (take immediate protective action).

Calibration Check: If your backyard thermometer reads 94°F while nearby Tempest #212066 and KISP read 86°F on a sunny afternoon, the backyard sensor is likely mounted too close to a dark roof, fence, or driveway without adequate airflow.
Interactive Lab 01

Long Island METAR Syntax Decoder

Select a real-world Long Island airport scenario or paste any raw METAR string to translate it.

Interactive Lab 02

Snow-to-Liquid Ratio (SLR) & P-Type Simulator

Adjust storm liquid QPF, surface temp, and 850mb (~5,000 ft) temp to see how Long Island snow totals and density shift.

Quick-Reference Field Guide

Long Island Meteorology Glossary (20 Terms)

Bombogenesis Winter

Rapid intensification of a mid-latitude cyclone where central pressure drops at least 24 millibars in 24 hours.

Dew Point Forecasting

The temperature air must cool to reach 100% saturation. Above 65°F feels muggy; above 70°F feels oppressive on Long Island.

Virga Radar

Precipitation streaks visible on radar that evaporate in dry air aloft before ever reaching the ground.

Barometric Tendency Forecasting

Rate and direction of pressure change over 3 hours. A rapid fall (>3 mb/3h) signals an approaching frontal or coastal storm.

Wind Shear Severe

Change in wind speed or direction with altitude—key fuel for organized squall lines and supercell rotation.

Storm Surge vs. Tide Marine

Storm surge is water pushed ashore by wind/low pressure above normal astronomical tide; storm tide is surge + tide combined.

Bright Banding Radar

A false ring of high reflectivity (45+ dBZ) caused by melting snowflakes coated in liquid water aloft.

40°N / 70°W Benchmark Winter

Classic ocean coordinate south of Nantucket/Montauk used to gauge whether a nor’easter keeps Long Island all snow.

Miller-A / Miller-B Winter

Coastal storm classifications: Miller-A tracks straight up the coast; Miller-B transfers energy from the Ohio Valley to the coast.

850mb Warm Nose Winter

A layer of above-freezing air around 5,000 ft altitude that melts falling snow into sleet or freezing rain.

Fetch Marine

The uninterrupted distance of open water over which wind blows to generate waves.

Ebb Current Marine

Outgoing tidal flow moving seaward through inlets; creates steep standing waves when opposing incoming ocean swell.

King Tide Marine

Exceptionally high astronomical tide occurring when a New or Full Moon coincides with lunar perigee.

CAPE Severe

Convective Available Potential Energy (J/kg)—measures atmospheric instability fueling thunderstorm updrafts.

Bow Echo Severe

An arched line of thunderstorms on radar associated with damaging straight-line wind gusts.

Sea-Breeze Front Forecasting

Leading edge of cool marine air pushing inland, often colliding along the LIE spine to spark afternoon storms.

Frost Hollow Forecasting

Low-lying sandy basin (especially in the Pine Barrens) where cold, dense air pools on calm, clear nights.

METAR Radar

Standardized hourly aviation weather observation issued by airports such as KISP, KJFK, KFRG, and KFOK.

Correlation Coefficient Radar

Dual-pol radar product (0–1.0) showing whether targets are uniform (pure rain/snow) or mixed (sleet/melting snow/debris).

Piezoelectric Haptic Instruments

Solid-state rain sensor technology used in Tempest #212066 that measures individual raindrop impact vibrations.

On-Site Instrumentation Lab

The Engineering Behind Tempest Station #212066

View Raw Tempest Telemetry
Sonic Anemometer (3s)

4 ultrasonic transducers measure wind speed & direction every 3 seconds with zero moving cups or bearings to freeze.

Haptic Rain Sensor

Piezoelectric impact plate detects individual raindrop vibrations, eliminating tipping-bucket clogging and lag.

EM Lightning Detector

Tracks electromagnetic radio-frequency pulses to estimate cloud-to-ground strike distance up to 25 miles away.

Solar & UV Radiometer

4 solar panels power internal LTO batteries while measuring W/m² solar irradiance and EPA UV Index.