Hayley here - Do you want to see severe weather in your calendar?
* it's like an add-on for your digital calendar NOT a paper calendar
You are looking at an outlook that is part of the medium range forecast (the outlook for days 4-8). The most important thing to note is that lack of a risk does not mean zero risk. Generally speaking, confidence has to be pretty high for the Storm Prediction Center to have an outlook area this far into the future.
When no specific risk areas are shown, you might see one of these phrases:
If you bookmark this page, it will continue to update with each new outlook that is issued.
| Day 4 | Monday, September 21 | predictability too low |
| Day 5 | Tuesday, September 22 | potential too low |
| Day 6 | Wednesday, September 23 | potential too low |
| Day 7 | Thursday, September 24 | potential too low |
| Day 8 | Friday, September 25 | potential too low |
ZCZC SPCSWOD48 ALL ACUS48 KWNS 180820 SPC AC 180820
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0320 AM CDT Fri Sep 18 2026
Valid 211200Z - 261200Z
DISCUSSION
Initially zonal mid-level flow, with embedded low-amplitude impulses traversing the central CONUS early next week, will give way to gradual amplification of an upper ridge over the central U.S. The best chance for any severe thunderstorms will be on Day 4/Monday across the TN Valley, where a surface cold front, preceded by rich low-level moisture, will be slow to clear the region. Thereafter, drier low-level conditions will prevail across much of the central and eastern CONUS, with surface high pressure poised to settle over much of the U.S. between the MS River and the Appalachians, limiting the severe threat.
..Squitieri.. 09/18/2026
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Drag the marker on the map and we'll show you the severe weather potential for a given location.
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SWO started as a spinoff project of wickedwx, but has since replaced the site.