Schedule the pour. Clear the crane. Know which sites are really in the storm.
An NWS warning treats your twelve jobsites as one, and the TV forecast can't tell you whether Thursday's pour holds. SiteWarn™ puts live meteorologists on every active site 24/7/365 — lightning warnings for crews in the open, wind warnings at your crane and lift limits, rain and flash-flood timing for pours and excavations, and a 7–10 day site forecast for the schedule.
Trusted for 14 years at more than 400 sites in all 50 states, with a 100% client renewal rate.
Customized for a single site — or for a command or operations center monitoring hundreds, even thousands, of sites from one screen.
Why contractors choose SiteWarn
A fully customized program: you set the thresholds, we watch the weather.
Lightning warnings the NWS won't give you
The National Weather Service issues no public warning for cloud-to-ground lightning — the biggest hazard for crews on decks, in trenches, on scaffolds and in the crane. We alert your superintendents in time to bring crews down and in, and give an all-clear so you're not losing more time than the storm takes.
Wind at your crane and lift limits
Tower cranes, mobile cranes, man-lifts and tilt-up panels each have a wind limit. You set them; we warn per site with onset and end timing — for thunderstorm gusts an hour or more ahead, and for large-scale wind events days ahead so you can plan lifts around them.
Rain and flood timing for pours and excavations
A 7–10 day forecast written for each jobsite tells you when the window for a pour or a dig is real. Short-fuse heavy-rain and flash-flood warnings cover open excavations, trenches and low sites in the hours before.
Every active site, not the entire region
We monitor each jobsite individually and warn only the sites in a storm's path. When an NWS warning includes a site but the storm won't reach it, a null-warning notification keeps that crew working. Sites come on and off the program as they open and close out.
What a typical contractor program looks like
Every program is built with your safety director. Here is a common starting point; each active jobsite carries its own thresholds and superintendent contact, and sites are added and removed as projects move.
- 7–10 day site forecast: issued daily for each active site with rain timing and amounts, wind, temperature and lightning risk by day and by work period, for pour, excavation and crane scheduling.
- Lightning: alert on cloud-to-ground strikes within 10 miles, warning within 8 miles (crews off decks, scaffolds and out of the crane), all-clear 30 minutes after the last strike inside the radius.
- High wind: warnings at your equipment limits — for example, 20 mph for tilt-up panel lifts, 30 mph for tower-crane operations, 35 mph for man-lifts — with onset and end timing by site.
- Heavy rain and flash flooding: warnings for open excavations, trenches and low sites with expected onset and rainfall amounts; pour-day rain timing updated through the morning.
- Hail, tornado and severe thunderstorm: site-specific warnings with expected arrival time for crew sheltering and equipment protection; null-warning notification when the NWS polygon includes a site but the storm does not.
- Delivery: portal and push alerts to the safety director and superintendents, live phone call to the superintendent for anything crew-critical, text and email to foremen and crane operators — and an API feed into your project management or safety platform.
- Heat (WBGT): advisories and warnings on Wet Bulb Globe Temperature at your work-rest thresholds — the scale OSHA-aligned heat programs use — per jobsite; heat index available.
- Wildfire: advisory when fire-weather conditions are expected to threaten the site or its access routes; warning when an active fire's location and expected spread put the site at risk, with timing and an all-clear.
- Hazard Matrix for the safety office: your jobsites grouped into districts or divisions you define, with each group's status for every hazard on one grid, so the safety director reads every crew's exposure at once.
Take the one-page overview with you
Everything on this page on a single sheet — lightning for crews, crane and lift wind limits, pour-day rain timing, and how to start a Free Live Trial. Made to forward to your safety director or project executives.
"I am very impressed with how SiteWarn has allowed us to keep employees safe and avoid un-needed weather related shutdowns at the same time. The service has paid for itself time and again."
SABIC Plant Safety and Security, Ottawa, IL
"Proactive storm warnings from WeatherGuidance prevented equipment damage and enabled an efficient post-event restoration with minimal risk exposure. We truly appreciate your valuable service!"
Operations team, utility-scale solar plant operator, Texas
Questions contractor safety directors ask
Can you cover jobsites that open and close during the year?
Yes. Sites are added and removed from the program as projects start and close out, with per-site thresholds and superintendent contacts. Contractors are billed for active sites on a group rate.
How far ahead can you tell us whether a pour is on?
Each active site gets a 7–10 day forecast daily, with rain timing and amounts by work period, and a short-fuse update the morning of. A meteorologist is available by phone for the go/no-go call.
Do you warn on wind for crane operations?
Yes. You set the limit for each crane, lift or panel operation; we warn per site with onset and end timing — an hour or more ahead for thunderstorm gusts, days ahead for large-scale wind events.
Do you warn for lightning?
Yes. The National Weather Service issues no warnings for cloud-to-ground lightning. SiteWarn alerts you to strikes within a custom radius of your site with enough lead time to move people and protect equipment, and tells you when it is safe to resume.
What does the Free Live Trial involve?
We set up your real jobsites, thresholds and delivery methods and monitor them exactly as we would for a paying client — no credit card and no obligation. Most sites are live the same day; overnight requests are set up the next morning.
See it live on your active sites
Not a demo. We set up your real jobsites with your real crane, lift and pour thresholds and monitor them exactly as we would for a paying client.
- 7–10 day site forecasts and live lightning, wind, rain and flood warnings for your actual jobsites
- Portal, app and radar with every site mapped, for safety and superintendents — API available for integration
- Your thresholds, lead time and delivery methods
- No credit card, no contract, no obligation
Prefer to talk first? Call (512) 504-3151 or email sitewarn@weatherguidance.com during business hours, and we'll get right back to you.
SiteWarn also serves electric utilities, utility-scale solar, railroads and more than a dozen other industries. See what the portal and app look like.