Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 254 AM EST Tue Dec 23 2025 Valid 12Z Tue Dec 23 2025 - 12Z Thu Dec 25 2025 ...There is a High Risk of excessive rainfall over parts of Southern California on Wednesday... ...Moderate to heavy snow over the Northeast... ...Rain/freezing rain possible over the Pennsylvania and Great Lakes... A system over the Great Lakes to the Central Plains and then northwestward to the Northern Rockies will move off the Northeast Coast by Tuesday night. Moisture streaming northward out of the Gulf will aid in developing rain over parts of the Ohio/Tennessee Valleys and the Mid-Atlantic through Tuesday afternoon. The rain will then concentrate over the Tennessee Valley, Tuesday evening through Wednesday morning. In addition, moderate to heavy snow will develop over the Northeast Tuesday through Wednesday morning. Furthermore, along the rain/snow line in Pennsylvania and parts of the Central Appalachians, areas of rain/freezing rain will develop over the region on Tuesday evening. By Wednesday evening, a wave of low pressure will develop over parts of the Upper/Middle Mississippi Valley and move eastward into the Ohio Valley/Central Appalachians by Thursday morning. The system will produce rain over parts of the Ohio Valley, moving into parts of the Mid-Atlantic by Christmas morning. Along the northern edge of the precipitation shield, pockets of rain/freezing rain will develop over parts of the Great Lakes a