High pressure is building in, keeping rain chances very low, and ramping up the temperatures. Our next batch of storms will not arrive until late next week.

Tonight & Tomorrow: Any stray shower that has formed today will quickly dissipate in the overnight hours. Expect mostly clear skies and lows in the mid to upper 60s. Just like this morning, some areas of fog will be possible. On Sunday, the dome of high pressure (called an upper-level ridge) will stay in place, and even get stronger. This will lead to even warmer temperatures. Highs will be near 90 degrees, possibly tying or breaking the record high for the day. As for rain, don't expect much. Just like today, a few stray showers and storms could pop up, mainly near the coast. 

Up Next: The heat and dry conditions will continue into early next week. A few more high temperature records will be threatened. Changes look likely later in the week. By Thursday, guidance shows an upper-level system (a trough) sweeping across the Mississippi Valley. Its a bit early for specifics, but just expect an increase in clouds and rain chances late week.

River Flooding: The National Weather Service has issued a RIVER FLOOD WARNING for the Mississippi River at Red River Landing, Baton Rouge, Donaldsonville, and Reserve, as well as the Atchafalaya River at Morgan City until further notice.

• At Red River Landing, flood stage is at 48 feet. Moderate flooding is already occurring. A crest of 59.8 feet is expected around April 30. At this level, the east bank levee will be topped, and the prison farmland between the two levees will be inundated. Angola Landing will be under water, closing the ferry there. All river islands along the reach from Red River Landing to Baton Rouge will remain inundated with recreational camps and river bottom farmland under water. This gauge will fall below flood stage around May 14.

• At Baton Rouge, flood stage is 35 feet. Major flood stage has been reached, with a crest at 42.5 feet expected on May 1. Around these levels, the grounds of the older part of Louisiana State University's campus become soggy. This includes the area around the Veterinary Medicine building, the Veterinary Medicine Annex, and Alex Box Stadium. Levees protect the city of Baton Rouge and the main LSU campus at this level. Caution is urged when walking near riverbanks. This gauge will fall below flood stage around May 12.

• At Donaldsonville, the flood stage is at 27 feet. Moderate flooding will begin shortly. Moderate flooding with a crest of 31.2 feet is expected around May 1. Around these levels, navigation becomes difficult for smaller river craft. Safety precautions for river traffic are urged. After cresting, the river will fall below flood stage around May 11.

• At Reserve, flood stage is at 22 feet. Minor flooding is already occurring. A crest of 23.8 feet is expected around May 1. Around these levels, slow-bell procedures will be enacted for river transportation. After cresting, the river will fall below flood stage around May 9.

• At Morgan City, flood stage of 6 feet will be reached by Saturday. Moderate flooding with a crest of 7 feet is forecast on May 3. At 7 feet, buildings at the foot of Ann Street on the riverside of the flood wall will flood as water overtops the Rio Oil Company dock. Buildings on the riverside of the Berwick floodwall will flood. River traffic restrictions will be strictly enforced. In addition, backwater flooding could potentially impact portions of areas around Lake Palourde and Stephensville.

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-- Balin

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