Scattered strong to severe thunderstorms will persist over the central to southern High Plains this weekend with a severe weather and flash flooding threat. A late season storm will bring low elevation rain and high elevation snow to portions of California, Nevada and Oregon through the weekend. Winter Weather Advisories are in place for the Sierra for snow totals of 3-6", locally higher. Read More >
Biggest takeaway:
Whatever plan you base off a tornado warning, that NWS tornado warning needs to be received instantly, & your plan triggered and accomplished rapidly (within a few minutes) to be of value.
Warning/Trigger for Plan:
NWS Tornado Warning
Advance Notice/Time to Activate & Accomplish Your Planned Response:
Plan on 5-10 minutes of advance warning.
Allow options that there may be little/no advance warning, and it may be as much as 30 mins.
Frequency:
Average is 0-2/year for any one location in this region.
How Accurate Warnings?
If a tornado occurs, it is highly likely that it was preceded by at least a few minutes by a NWS Tornado Warning. That said, with the current state of the science, more than half of NWS Tornado Warnings are false alarms. Furthermore, even when a tornado does occur within a warning area, it is less likely to hit your specific location.