Sandbox

Try it against your own site.

Paste the coordinates of a site you actually run. We will tell you which permit rule applies there, what rainfall puts you on the clock, and when the deadline lands in your local time. No account, no card.

Your coordinates

Anywhere in the contiguous US.

Optional. We use the rainfall actually observed at your coordinates; enter a figure to ask what a different storm would do instead.

Only if your permit or local program is stricter than the state default.

Your result appears here — the rainfall two independent NOAA products are reporting at your coordinates right now, the permit threshold that applies, and the deadline a storm would create.

RainAlert is a monitoring and recordkeeping aid, not a compliance guarantee. Where your permit requires an on-site rain gauge, that gauge is the system of record. The rainfall shown here is read from the same two NOAA grids the monitored sites use, at the same grid cell your site would use — we alert on the higher of the two and never average them. A point with no radar coverage reads as —, never as 0.00.