Check IWIN's readme to make sure you are getting the latest information. Current California Special Weather Statements . Watches , warnings and advisories are non-routine products issued by the National Weather Service. They are issued to alert you of meteorological events that could pose a threat to life and property. It is intended to provide enough lead time so those who need to set their plans in motion can do so.
Watches evolve into warnings, advisories or they are canceled.
Warnings are issued when a hazardous weather or hydrologic event is occurring, is imminent or has a very high probability of occurrence. It is used for conditions posing a threat for life or property. Monthly Storm Data Summaries Storm Data is viewed with the Free Adobe Acrobat Reader. Unlike winter weather or non-precipitation type weather, severe weather is usually localized. In the map above, the letters represent the sub-divisions of each county.