Available by midmorning if thunderstorms are forecast from May through mid September. Watches are typically in effect for four to eight hours. Warnings are usually valid for 30 minutes to an hour with information updated every 15 to 20 minutes. Flash Flood Watches Information on the potential for flash flooding. Watches are typically in effect for six to twelve hours.
Warnings are usually valid for one to six hours with information updated every one to two hours.
Urban or Small Stream Flood Advisories Issued for minor flooding on city streets and underpasses or along creeks. Civil Emergency Message Evacuation notices in the event of wildfires, chemical spills, explosions, or radioactive releases as requested by local emergency managers. Air Pollution Alerts Issued for dust or smoke that elevates pollution levels in Rapid City. Record Reports Issued when new high and low temperatures and precipitation records are set. Public Information Statement Provides information on new products and services from the National Weather Service, seasonal safety information, and unusual or interesting weather conditions.