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Note:
The thunderstorm probabilities take into account both the expected areal coverage and probability for thunder to occur.
Therefore, a 40% probability means that given similar environmental conditions, thunder would be observed at any one location (in either a county or city) within the 40% thunder probability area four times out of ten, or 40% of the time.
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Note:
Effective September 26, 2012, the SPC Thunderstorm Outlook becomes operational.
Here is the Service Change Notice 12-29.
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| Retrieve Previous SPC Thunderstorm Outlooks |
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weather.gov 
@NWSSPC
