TUPELO, Miss.--A cold air mass that is affecting the north part of the U.S. is touching the northern parts of Mississippi, bringing with it temps that are about ten degrees colder than the southern two thirds.

The jet stream is bringing 40 degree highs to Tupelo and Greenville and areas north today, with lows expected near 30.

Central Mississippi to the coast will be from ten to 15 degrees warmer today and the forecast has temperatures rising as the week goes on, eventually peaking Thursday. Then, it's a nose dive, with rain in the forecast for Thursday and Friday and highs in the upper 30s north to low 40s central and south by Saturday.

Flood warnings continue for some area rivers due to recent rains and melting snow. The National Weather Service website has the following warnings posted for today:

BIG BLACK RIVER AT WEST AFFECTING ATTALA AND HOLMES COUNTIES
BIG BLACK RIVER NEAR BENTONIA AFFECTING MADISON AND YAZOO COUNTIES
BIG BLACK RIVER NEAR BOVINA AFFECTING HINDS AND WARREN COUNTIES

PEARL RIVER ABOVE PHILADELPHIA AFFECTING NESHOBA COUNTY
PEARL RIVER AT EDINBURG AFFECTING LEAKE COUNTY
PEARL RIVER NEAR CARTHAGE AFFECTING LEAKE COUNTY
YOCKANOOKANY RIVER NEAR OFAHOMA AFFECTING LEAKE COUNTY
PEARL RIVER AT JACKSON AFFECTING HINDS AND RANKIN COUNTIES