ChaseCast | Radar for storm chasers

Huge lightning bolts striking over the lights of the Tucson Valley at night

Designed for storm chasers, by storm chasers.

The radar, satellite and storm data you already rely on, together on one fast, easy map. No more switching between apps mid-chase.

Request beta access What's in it

Beta now open: Android first, iPhone to follow

ChaseCast showing super-resolution reflectivity with labeled echo-top peaks

Tucson Valley, AZ · Photo: Setul Patel

Who we are

Built by people who chase

ChaseCast is owned and built by two storm chasers and photographers, shaped by decades of chasing on the Great Plains and in the desert Southwest. Every screen is built around what you actually need on the road, not what looks good on a desk.

John Sirlin

Storm chaser and weather photographer

“A single source of data that us chasers have been dreaming of!”

John has chased storms for more than 30 years. He learned on the northern Plains in the early 1990s, before mobile radar and real-time data, and has chased every Arizona monsoon since 1998. His storm photography has appeared on The Weather Channel, CNN, ABC, NBC and CBS, and twice as The Washington Post's Photo of the Week. He leads storm photography tours through Incredible Weather Adventures.

Setul Patel

Storm chaser, photographer and entrepreneur

“Lightning doesn't wait while you switch apps.”

Setul chases supercells across Kansas, Colorado and the Great Plains and lightning in the Arizona monsoon, and shoots them as a landscape and storm photographer. Off the road he's a problem-solving entrepreneur: an emergency physician by training, he founded the investment firm Girish Capital and the healthcare startup FormulaMed, and was named EY Entrepreneur of the Year for the Gulf Coast in 2015. ChaseCast is the tool he wanted on his own chases.

Every feed you chase with, in one place

Chasing usually means juggling a radar app, a satellite viewer, a warnings feed and a forecast site, often on one bar of signal. ChaseCast takes the critical data feeds you already know and trust and puts them on one map that's quick to read and easy to use with one thumb: local and national radar, satellite cloud imagery, and the tools that show where storms are headed.

Super-resolution Level II radar

Reflectivity straight from NEXRAD Level II, half-degree by 250-meter gates, drawn on your phone's GPU. If Level II is down it falls back to Level III and tells you which you're seeing.
Storm-relative velocity

Radar velocity with the storm's own motion taken out, so rotation stands out instead of hiding in the overall flow.
Echo tops and VIL

Enhanced echo tops with labeled peaks for the tallest cells, and digital VIL so the heaviest cores stand out.
National radar and satellite

A nationwide radar composite with its scan time always shown, plus GOES-East infrared, visible and water vapor imagery for watching towers go up.
Where storms are headed

Radar-tracked storm cells with their past trail and forecast path in 15-minute steps, plus a CAPE overlay showing the instability storms have to work with.
Live NWS warnings

Active warning polygons on the map, and every alert in a list you can read in seconds. Plus a GPS log of the route you chased.
Built for spotty cell service

Radar for the sites nearest you downloads quietly in the background, and recent scans are saved on your phone, so a dead zone never leaves you blank. Saved scans are always marked as saved.
Made for the field

Dark only, with high contrast that holds up in direct sun. Big targets, one or two taps to anything. Old data is flagged as old, and missing data never shows as zero.