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Hyperlocal Wet-Bulb Temp, Rain/Snow Freezing Level & Alert Lab (2026)

Calculate Stull (2011) thermodynamic Wet-Bulb Temperature (`Tw`), Magnus-Tetens Dew Point, Rain-to-Snow phase probability, snow-to-liquid ratio (SLR), and freezing level elevation from surface temperature, humidity, and pressure.

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Hyperlocal Wet-Bulb Temp, Rain/Snow Freezing Level & Alert Lab — Interactive Console
Runs locally in your browser • Instant output
Wet-Bulb Temp (Tw)
28.98 °C
84.2 °F (Stull Formula)
Dew Point
27.26 °C
81.1 °F Saturation
Snow Probability
0%
Rain Dominant
Freezing Level (0°C)
5,481 m
ISA 6.5°C/km Lapse
Heat Stress & iOS Severe Weather Trigger
High Risk (Mandatory Hydration & Shade Rest Cycles)
Heat Advisory Notification
Ready
Embed / Cite This Tool (Markdown & HTML)
GitHub / Reddit Markdown Badge[![Hyperlocal Wet-Bulb Temp, Rain/Snow Freezing Level & Alert Lab](https://img.shields.io/badge/ZerosUniverse-Free_Tool-ff6a00)](https://www.zerosuniverse.com/tools/wet-bulb-snow-probability-weather-alert-lab/)
Blog / Documentation HTML Citation<a href="https://www.zerosuniverse.com/tools/wet-bulb-snow-probability-weather-alert-lab/">Hyperlocal Wet-Bulb Temp, Rain/Snow Freezing Level & Alert Lab — ZerosUniverse</a>

2026 Quick-Reference Cheat Sheet & Benchmark Table: Hyperlocal Wet-Bulb Temp, Rain/Snow Freezing Level & Alert Lab

Quick Answer & 2026 Technical Summary (wet bulb temperature snow probability calculator)Updated 2026 Standard

When snowflakes fall from cold clouds into a dry, above-freezing surface air layer (for example, `+2.5°C` at `35%` relative humidity), moisture sublimates and evaporates off the surface of the snowflake. That evaporation absorbs latent heat from the flake itself, keeping the snowflake's internal temperature at the **Wet-Bulb Temperature** (`-1.4°C` in that scenario)—well below freezing! Use this interactive wet bulb temperature snow probability calculator above to test wet bulb snowmaking temperature calculator, rain vs snow freezing level calculator, and stull 2011 wet bulb formula online locally in your browser with zero server uploads.

Target Keyword Spec: wet bulb temperature snow probability calculator | Modules: Stull (2011) Wet-Bulb (`Tw`) & Evaporative Cooling Engine • Rain / Sleet / Wet Snow / Dry Powder Phase Classifier • Freezing Level (`0°C` Isotherm) & Lapse Rate Altitude Profiler
Primary Focus: wet bulb temperature snow probability calculator
Core Capability: wet bulb snowmaking temperature calculator
Privacy Mode: 100% Client-Side (Zero Upload)
Technical Parameter / ModuleStandard / Keyword SpecArchitecture & Validation RuleOperational Use Case (2026)
Stull (2011) Wet-Bulb (`Tw`) & Evaporative Cooling Enginewet bulb snowmaking temperature calculatorCompute exact Wet-Bulb Temperature from Dry-Bulb Air Temp (`T`) and Relativ...Predicting Whether a Marginal 34°F–38°F Storm Will Fall as Rain or Snow
Rain / Sleet / Wet Snow / Dry Powder Phase Classifierrain vs snow freezing level calculatorEvaluate sub-zero wet-bulb cooling (`Tw <= 0.5°C`), Snow-to-Liquid Ratio (S...Ski Resort Snowmaking & Backcountry Freezing-Level Planning
Freezing Level (`0°C` Isotherm) & Lapse Rate Altitude Profilerstull 2011 wet bulb formula onlineCalculate the exact elevation (in meters and feet) where rain transitions t...Setting Up Smart iPhone Shortcuts & Home Automation Weather Triggers
Computation Engine PrecisionIEEE 754 Double-Precision Float64Real-Time Zero-Latency RecalculationInstant interactive output without page reloads
Data Persistence & ExportZero-Upload Local Browser Memory1-Click Copy / JSON / CSV / Audio ExportFinancial & personal inputs never leave device
2026 Regulatory & Spec BaselineUpdated 2026–27 Formulas & ThresholdsVerified Against Official Spec TablesEliminates stale pre-2025 rate assumptions
In-Depth ZerosUniverse Tutorial

How to Set Up Rain and Snow Alerts on Your iPhone in 2026

Read our complete step-by-step editorial guide, architecture breakdown, and defensive best practices on ZerosUniverse.

Read Full Guide

How to Use Hyperlocal Wet-Bulb Temp, Rain/Snow Freezing Level & Alert Lab

01

Enter Dry-Bulb Air Temperature, Relative Humidity & Elevation

Adjust the Dry-Bulb Temperature (`°C` or `°F`), Relative Humidity (`5%–100%`), Wind Speed, and Station Altitude sliders—or load a Winter/Summer preset.

02

Inspect Wet-Bulb Temperature (`Tw`) & Dew Point (`Td`)

Observe how low relative humidity pulls the Wet-Bulb Temperature several degrees below the Dry-Bulb air thermometer reading via latent heat of vaporization.

03

Check Rain-vs-Snow Probability & Snow-to-Liquid Ratio (SLR)

Review the calculated precipitation phase (Dry Powder, Heavy Wet Snow, Rain/Snow Mix, or Cold Rain) and Freezing Level (`0°C` isotherm) altitude.

04

Review iPhone Weather Alert & iOS Shortcut Automation Rules

Copy the recommended alert thresholds for Black Ice, Freezing Rain, Snow Accumulation, or Extreme Wet-Bulb Heat Stress.

Key Capabilities & Technical Architecture

Stull (2011) Wet-Bulb (`Tw`) & Evaporative Cooling Engine

Compute exact Wet-Bulb Temperature from Dry-Bulb Air Temp (`T`) and Relative Humidity (`RH%`) to explain why snow falls even when surface air is `+3°C` (`37°F`).

Rain / Sleet / Wet Snow / Dry Powder Phase Classifier

Evaluate sub-zero wet-bulb cooling (`Tw <= 0.5°C`), Snow-to-Liquid Ratio (SLR `10:1` vs `15:1` Champagne Powder), and artificial snowmaking viability (`Tw <= -2.0°C`).

Freezing Level (`0°C` Isotherm) & Lapse Rate Altitude Profiler

Calculate the exact elevation (in meters and feet) where rain transitions to snow based on environmental lapse rates (`6.5°C/km`) and station elevation.

Heat Stress WBGT & iPhone / HomeKit Weather Alert Thresholds

Switch seamlessly between winter precipitation phase physics and summer human survivability wet-bulb thresholds (`Tw > 31°C` / `35°C`) with iOS Shortcuts alert rules.

Practical Use Cases

Predicting Whether a Marginal 34°F–38°F Storm Will Fall as Rain or Snow

Enter local temperature and humidity ahead of a winter front to see if evaporative cooling (wet-bulb below `0.5°C` / `33°F`) will turn rain into accumulating snow.

Ski Resort Snowmaking & Backcountry Freezing-Level Planning

Check if the wet-bulb temperature meets the `-2.0°C` (`28.4°F`) threshold for snow guns and find the exact mountain elevation of the `0°C` snow line.

Setting Up Smart iPhone Shortcuts & Home Automation Weather Triggers

Generate precise dew point, wind chill, and wet-bulb threshold rules to complement iOS Weather Next-Hour Precipitation notifications.

Frequently Asked Questions (FAQs)

How can it snow when the outdoor air temperature is above freezing (e.g., 36°F / +2.2°C)?+

When snowflakes fall from cold clouds into a dry, above-freezing surface air layer (for example, `+2.5°C` at `35%` relative humidity), moisture sublimates and evaporates off the surface of the snowflake. That evaporation absorbs latent heat from the flake itself, keeping the snowflake's internal temperature at the **Wet-Bulb Temperature** (`-1.4°C` in that scenario)—well below freezing!

What is the Stull (2011) arctangent formula for Wet-Bulb Temperature?+

Meteorologist Roland Stull published an empirical closed-form equation in the *Journal of Applied Meteorology and Climatology* (2011) that computes Wet-Bulb Temperature (`Tw`) directly from air temperature (`T` in °C) and relative humidity (`RH%`) using four `atan()` terms with an accuracy within `±0.3°C` across standard atmospheric pressures.

What Wet-Bulb Temperature is required for ski resort snowmaking?+

Commercial fan and lance snow guns require a Wet-Bulb Temperature of `-2.0°C` (`28.4°F`) or colder (`-1.5°C` with nucleating additives). At `28°F` Dry-Bulb and `90%` humidity, the wet-bulb is `-2.7°C` (marginal), whereas at `34°F` Dry-Bulb and `25%` humidity, the wet-bulb is `-3.1°C` (excellent snowmaking despite above-freezing air).

Why is a 35°C (95°F) Wet-Bulb Temperature considered the human physiological limit?+

The human body cools itself primarily through the evaporation of sweat from skin maintained near `35°C` (`95°F`) while core temperature stays at `37°C` (`98.6°F`). When the ambient Wet-Bulb Temperature reaches `35°C` (or `~31°C` in empirical Penn State human trials), sweat can no longer evaporate into the air, leading to uncompensable hyperthermia even in shade with unlimited water.

How does Snow-to-Liquid Ratio (SLR) change with temperature?+

The classic `10:1` rule (10 inches of snow per 1 inch of liquid water equivalent) only holds near `-1°C` to `-3°C` (`27°F–30°F`). In cold dendritic growth zones (`-12°C` to `-18°C`), SLR climbs to `15:1` or `20:1` ('Champagne Powder'), whereas near `0°C` (`32°F`) wet cement snow drops to `5:1` or `7:1`.