As millions of Americans hunker down for the winter storm, 19 states and Washington, D.C., have declared states of emergency.

NORTHWEST ARKANSAS/RIVER VALLEY, Ark. (KNWA/KFTA) — The Storm Prediction Center collaborated with the Cooperative Institute for Severe and High-Impact Weather Research and Operations (CIWRO) and has released a new Severe Hazards Data Viewer,

Predicting the weather is a tricky thing, but figuring out the forecast can be just as difficult, especially when it comes to chance of rain.