(11:45AM - 4/9/21) A storm system will move through the region today through Sunday, bringing an isolated severe t'storm threat to Southern Illinois this afternoon through Saturday morning, and windy conditions to portions of the state Saturday morning through Sunday morning.
A storm system will move through the Midwest and Great Lakes today through Sunday, bringing an isolated severe t'storm threat to Southern Illinois this afternoon through Saturday morning, and windy conditions to portions of the state Saturday morning through Sunday morning. Model guidance with time the past several days has come in with a farther northwest and stronger solution for this storm system, which will to the isolated severe t'storm risk across Southern Illinois and the windy conditions across portions of the state.
A marginal environment is expected to develop across Southern Illinois, ahead of an approaching developing storm system. A few isolated showers and t'storms are expected to develop along a stationary boundary across Southern Illinois, and will move across portions of Southern Illinois this afternoon. With the marginal environment in place, an isolated strong to severe t'storm will be possible...However, the main focus is a bit later, as the developing storm system moves through. Scattered showers and t'storms will develop across portions of Missouri, Arkansas and Eastern Oklahoma this afternoon, in the vicinity of a warm front and cold front. This activity will then push northeastward, eventually moving across Southern Illinois from this evening through Saturday morning. Given the aforementioned marginal environment that is expected to be in place, a level 1 (isolated) severe t'storm risk will be possible across Southern Illinois, from Friday evening through Saturday morning. Hail, damaging winds and an isolated tornado will all be threats with any severe t'storm.
In addition to the severe t'storm threat, windy conditions are expected across portions of the state, Saturday morning through Sunday morning. Wind gusts of 25-45MPH will be likely across a good portion of the state during this period, aided by a steadily developing and strengthening storm system, prior to it occluding and weakening.
Below is the severe t'storm and wind forecasts for this event.