Moderate

* WHAT...Sub-freezing temperatures from 28 to 32 degrees expected. * WHERE...Portions of central, north central, and northeast South Dakota. * WHEN...From 1 AM to 8 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Take steps now to protect tender plants from the cold.

* WHAT...Dangerous rip currents. * WHERE...Gulf-facing beaches, including the Matagorda Peninsula, Brazoria County beaches, Galveston Island and the Bolivar Peninsula. * WHEN...Through Wednesday evening. * IMPACTS...Rip currents can sweep even the best swimmers away from shore into deeper water. Swim near a lifeguard and away from rocks, jetties, and piers. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If

* WHAT...Heat index values up to 96. * WHERE...Portions of northern Connecticut, central, eastern, northeastern, southeastern, and western Massachusetts, and northern Rhode Island. * WHEN...Until 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose

* WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Portions of central, north central, northwest, and west central Minnesota and northeast and southeast North Dakota. * WHEN...From 1 AM to 9 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. Take steps now to protect tender plants from the cold.

At 105 PM CDT, a strong thunderstorm near Pattonville, or near Paris, moving east at 45 mph. HAZARD...Observed wind gusts of 50 to 55 mph. SOURCE...AWOS observation. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Paris, Blossom, Roxton, Lake Crook, Powderly, Sumner, Lake Gibbons, Pattonville, Arthur City, Camp Maxey, Pat Mayse Lake, Forest Hill, Deport, Novice, Toco, Sun Valley, Glory, Minter, Direct, and Midcity.

At 109 PM CDT, Doppler radar was tracking a strong thunderstorm 11 miles southwest of Huckabay, or 16 miles northwest of Dublin, moving northeast at 20 mph. HAZARD...Wind gusts up to 50 mph and nickel size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. This storm will remain over mainly rural areas of northwestern Erath, northeastern Eastland and north central Comanche Counties, including

* WHAT...Dangerous rip currents expected. * WHERE...In Alabama, Mobile Coastal and Baldwin Coastal Counties. In Florida, Escambia Coastal, Santa Rosa Coastal and Okaloosa Coastal Counties. * WHEN...Through this evening. * IMPACTS...Rip currents can sweep even the best swimmers away from shore into deeper water. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the

At 113 PM CDT, Doppler radar was tracking a strong thunderstorm near Ray Roberts Park Isle Du Bois, or near Sanger, moving east at 10 mph. HAZARD...Wind gusts up to 50 mph and nickel size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. This strong thunderstorm will be near... Denton, Aubrey, Ray Roberts Park Isle Du Bois, and Ray Roberts Park Johnson Branch around 120 PM CDT. Krugerville around 130 PM CDT.

At 217 PM EDT, Doppler radar was tracking strong thunderstorms along a line extending from Milford to Hamburg to near Chelsea. Movement was northeast at 45 mph. HAZARD...Winds in excess of 40 mph and half inch hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor damage to outdoor objects is possible. Strong thunderstorms will be near... Novi, Brighton, Milford, Dexter, Hamburg, South Lyon, and Whitmore Lake around 220 PM EDT.

* WHAT...Sub-freezing temperatures as low as 29 degrees expected. * WHERE...Arco/Mud Lake Desert. * WHEN...From 3 AM to 9 AM MDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. Take steps now to protect tender plants from the cold.