RexWeather — The tornado enthusiast's weather app

The ultimate weather app for tornado enthusiasts.

RexWeather brings current conditions, live severe weather alerts, SPC outlooks, Tornado Potential scoring, and over 75 years of historical tornado information into one fast, privacy-first app.

iPhone & iPad Tornado Potential SPC Outlooks Native Material UI No tracking

Current weather meets tornado climatology.

Check the sky right now, see official risk context from NWS and SPC, then explore tornado tracks from 1950 to the present with EF/F colors, path details, DAT damage polygons, and nearby history around any active location.

Read the User Guide What's New in 1.4

75+ yearsNOAA tornado records from 1950 to present

1-10Tornado Potential score for the next few hours

3 daysSPC Day 1, Day 2, and Day 3 outlook maps

What's New in Version 1.4

This release turns RexWeather into a deeper severe-weather companion, blending official outlooks, live alerts, model ingredients, and historical tornado context.

Tornado Potential Score

A new home-screen card estimates tornado-favorable conditions over the next 6 hours on a 1-10 scale.

Uses live NWS alerts, SPC tornado probabilities, WeatherKit observations, and GFS model ingredients from Open-Meteo.
Factors in CAPE, Lifted Index, wind shear, CIN, dew point, storm signal, geography, and seasonality.
Shows a detail sheet with booster, neutral, and blocker ingredients so you can see why the score landed where it did.

Interactive SPC Outlooks

RexWeather now includes full NOAA Storm Prediction Center outlook maps, not just a static summary.

Day 1, Day 2, and Day 3 maps with categorical, tornado, wind, hail, and probabilistic layers where available.
Official SPC colors, risk detection for your active location, timing metadata, and forecaster discussion text.
Maps render with city labels visible through polygons for better geographic context.

Live Alerts and Better Location Support

Home-screen severe weather context now follows the location you choose, whether that is GPS or a saved city.

NWS alert cards surface active warnings, watches, advisories, and PDS tornado warning treatment for US locations.
Canadian locations skip US-only NWS/SPC services gracefully while still using Open-Meteo ingredients for Tornado Potential.
Nearby Tornado History searches around the active city, not just the device GPS position.

Richer Tornado History

The historical side now goes beyond tracks, adding more accurate current-year and damage-path context.

NOAA SPC historical records pair with NOAA NCEI current-year tornado data and offline caching.
NOAA Damage Assessment Toolkit polygons show surveyed damage footprints when available.
Pre-2007 tornadoes use original Fujita Scale wind ranges, while modern events use Enhanced Fujita ranges.

Features

Built for people who want both today's weather and the long arc of tornado history in one place.

Current Weather

WeatherKit conditions, feels-like temperature, humidity, wind, night-aware icons, animated backgrounds, and pull-to-refresh.

Tornado Potential

A 1-10 score combines alerts, SPC tornado probability, atmospheric ingredients, model data, and regional context.

SPC Outlook Maps

Day 1, Day 2, and Day 3 convective outlooks with categorical, tornado, wind, hail, and probabilistic layers.

Live NWS Alerts

Location-specific warning and watch cards with priority coloring, PDS tornado warning treatment, and full alert text.

Historical Tornado Data

NOAA SPC records from 1950-present, NOAA NCEI current-year data, F/EF scale handling, path width, casualties, and damage details.

Privacy and Offline Cache

No analytics or tracking. Weather, tornado, SPC, NCEI, and DAT data use smart caches so the app stays useful when service is spotty.

Enhanced Fujita (EF) Colors

EF	Wind	Color	Description
EF0	65–85 mph	🟢 Light Green	Light damage
EF1	86–110 mph	🔵 Blue	Moderate damage
EF2	111–135 mph	🟡 Yellow	Considerable damage
EF3	136–165 mph	🟠 Orange	Severe damage
EF4	166–200 mph	🔴 Red	Devastating damage
EF5	>200 mph	🟣 Purple	Incredible destruction