Current conditions are observed and recorded by officials at reporting stations across the U.S. These stations are identified by a three-letter code. These codes appear on the local forecast maps, and those are what your click on to get conditions and forecasts.
Current conditions are recorded by officials at the stations, however, forecasts are usually prepared at regional offices by professional NWS meteorologists. The forecasts shown on weatherTAP are the "zone forecasts" for the zones that the stations reside in. A zone is usually a county or some other political boundary, although in some areas zones are delineated based on geographic features (i.e. California). Conditions are observed and recorded by officials at reporting stations across the U.S., as described above.
The conditions are generally reported at the top of every hour. weatherTAP makes them available on the site as soon as they come in, usually less than five minutes after the hour. If radical changes occur in the current conditions for a station before the next scheduled report, then new conditions will sometimes be reported. weatherTAP always displays the latest reported conditions transmitted to us by the NWS. Forecasts are usually issued two-to-four per day, depending on the conditions. If a weather event occurs which leads to a radical change in a forecast, then a new one will be issued. To be sure, weatherTAP always displays the latest issued forecast.