How It Works — RainLog

RainLog monitors NOAA precipitation data for your active construction sites. When reported rainfall exceeds your permit-defined threshold, your team is alerted and an event log is generated.

No hardware. No manual weather checking. One narrow job, handled reliably.

1. Site setup and station mapping

You add sites by address. RainLog maps each one to a nearby NOAA station based on proximity.

You see exactly which station is assigned and how far it is. In metro areas, stations are typically within a few miles. In rural areas, distances may be greater.

Station ID, name, and distance are displayed so you can evaluate the match. If the default station isn't right for your project, you can request a different one.

2. Rainfall data sourcing

RainLog uses precipitation data from NOAA's National Weather Service observation stations, the same data publicly available at weather.gov.

Data is checked at regular intervals. When new observations are reported, RainLog evaluates them against your configured threshold.

Important: NOAA data reflects reported observations, not forecasts. Reporting intervals vary by station. RainLog does not generate its own weather data. Every reading is traceable to a specific station and timestamp.

3. Event detection

A qualifying event is detected when precipitation accumulation exceeds your permit-defined threshold at the NOAA station mapped to your site.

The default threshold is 0.50 inches in a 24-hour period, consistent with the federal NPDES Construction General Permit. If your state permit specifies a different threshold, you can configure it per site.

When the threshold is crossed, RainLog records the event with the exact station, accumulation, and timestamp.

4. Alerts

When a qualifying event is detected, designated contacts receive an email alert with:

Site name and address
Station ID and distance from site
Rainfall accumulation
Threshold
Event timestamp
Inspection deadline

Your team knows the site, the data, and the deadline.

5. Documentation

Each event generates a log with:

Station ID, name, and coordinates
Distance from site
24-hour accumulation
Threshold
Event timestamp
Alert timestamp
Inspection deadline

Logs can be downloaded as PDFs or emailed. Every data point is traceable to the specific NOAA station and timestamp, and can be verified at weather.gov.

6. Example output

Below are examples of what RainLog produces. These are sample outputs, not live data.

Sample email alert

Subject: RainLog Alert: Westside BeltLine Ph. 3 — 0.62 in recorded
0.62 in at KATL. 24-hr inspection due by Mar 16 02:18 AM.

Sample event log entry

Field	Value
Site	Westside BeltLine Phase 3
Station	KATL · Hartsfield-Jackson Intl
Distance	4.2 mi from site
Rainfall	0.62 in (24hr accumulation)
Threshold	0.50 in
Event time	Mar 15, 2026 02:18 AM EDT
Alert sent	Mar 15, 2026 02:22 AM EDT
Inspect by	Mar 16, 2026 02:18 AM EDT

PDFs include the same fields, formatted for print and audit filing.

Not a compliance guarantee. RainLog provides supporting documentation based on publicly available NOAA data. It does not replace regulatory judgment, on-site gauges where required, or your team's responsibility to interpret permit requirements. Always confirm your obligations with your state environmental agency.

RainLog monitors NOAA rainfall at your sites, alerts your team when a qualifying event is detected, and generates documentation.

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