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 | Tuesday, April 21 | potential too low |
| Day 5 | Wednesday, April 22 | predictability too low |
| Day 6 | Thursday, April 23 | 15% |
| Day 7 | Friday, April 24 | predictability too low |
| Day 8 | Saturday, April 25 | predictability too low |
ZCZC SPCSWOD48 ALL ACUS48 KWNS 180740 SPC AC 180740
Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0240 AM CDT Sat Apr 18 2026
Valid 211200Z - 261200Z
DISCUSSION
Initially dry conditions will keep the severe weather threat low on D4/Tuesday. As a mid-level trough traverses the Rockies on Monday, lee troughing will strengthen on D5/Wednesday. This will bring substantial moisture return across the Plains. Given the early stage moisture return, more than an isolated severe weather threat appears unlikely on D5.
A more substantial severe weather threat is anticipated on Day 6/Thursday. The evolution of the mid-level trough still remains unclear, but an overall pattern featuring broad troughing across the southern/central Plains, moderate to strong instability, and a sharp dryline, could support at least isolated supercells Thursday afternoon/evening. Have added a 15% area from western/central Oklahoma into southern/eastern Kansas where the severe weather threat seems likely regardless of how exactly the mid-level pattern evolves.
The uncertainties discussed for Day 6 become greater on Day 7 and beyond. Persistent troughing across the Plains and considerable instability suggest that severe weather is likely on Friday (and likely into the weekend). However, the progression of the mid-level trough and the associated surface features need to become more clear before a 15% area can be defined for these days.
..Bentley.. 04/18/2026
CLICK TO GET WUUS48 PTSD48 PRODUCT
Drag the marker on the map and we'll show you the severe weather potential for a given location.
Hi, I'm Hayley. Did you know that I run this site out of my own pocket? So if you'd like to help out and you're already planning on buying something off of Amazon, why not use our Amazon Severe Weather Outlook link before you buy and we'll get a tiny portion of your purchase.
SWO started as a spinoff project of wickedwx, but has since replaced the site.