Active Alerts: 1

Travel Update: Coronavirus (COVID-19): For everyone's safety, masks are now required at STL. Get the latest information.

Weather Measured: STL Photo of the Week

Posted on January 10, 2020 in Photos

An All-Weather Precipitation Accumulation Gauge measures snow and rain at St. Louis Lambert International Airport for the National Weather Service.

St. Louis Lambert International Airport (STL) is a common location reference for our official weather forecasts. If there’s rain or snow, or highs or lows, there’s often a link to the Airport. So where does that information come from? It comes from a series of sensors on the airfield operated by the National Weather Service (NWS), officially known as the Automated Surface Observing Systems (ASOS) program. STL’s is located on the western edge of the airfield, just north of Runway 12-R. ASOS is a joint effort of the NWS and the Federal Aviation Administration, collecting weather data every minute, every day of the year-- which is shared for aviation operations, weather forecasters, and climatology researchers. The All-Weather Precipitation Accumulation Gauge looks like stainless steel UFO with central bucket. But it’s key to measuing snow and rain. Other sensors track temperature, wind, pressure, visibility, sky conditions, or potential visual obstructions like fog or haze. ASOS units can be found at most airports and other sites across the country.