Moderate

At 121 AM CDT, Doppler radar was tracking a cluster of strong thunderstorms near South Fork Estates, or 7 miles west of Hebbronville, moving southeast at 30 mph. HAZARD...Wind gusts up to 50 mph and half inch hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Hebbronville, Las Lomitas, Gruy Stadium, Randado, Thompsonville, Jim

* WHAT...Heat index values up to 99 expected. * WHERE...Eastern Bergen, Eastern Essex, Eastern Passaic, Eastern Union, Hudson, Western Bergen, Western Essex, Western Passaic, and Western Union Counties. * WHEN...From 11 AM this morning to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses. A Heat Advisory is issued when the combination of heat and humidity is expected to make it feel like it is 95 to 99 degrees for two or more consecutive days, or 100 to 104 degrees for any length of time.

* WHAT...Heat index values up to 99 expected. * WHERE...Bronx, Kings (Brooklyn), New York (Manhattan), Northern Queens, Richmond (Staten Island), and Southern Queens Counties. * WHEN...From 11 AM this morning to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses. New York City residents should call 3 1 1 to identify cooling center locations and obtain 'Beat the Heat' safety tips. A Heat Advisory is issued when the combination of heat and humidity

* WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Portions of central, north central, and northeast South Dakota. * WHEN...From 11 PM this evening 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...For the Frost Advisory, temperatures as low as 36 will result in frost formation. For the Freeze Warning, sub-freezing temperatures as low as 30 expected. * WHERE...Hughes, Sully, Campbell, Edmunds, McPherson, Potter, and Walworth Counties. * WHEN...For the Frost Advisory, from 4 AM to 9 AM CDT this morning. For the Freeze Warning, from 11 PM this evening to 8 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor

* WHAT...Dangerous rip currents. * WHERE...East facing reefs of the Marianas. * WHEN...Through Thursday afternoon. * IMPACTS...Rip currents can sweep even the best swimmers away from shore into deeper water. * ADDITIONAL DETAILS...A high risk of rip currents along east-facing reefs is now in effect through Thursday afternoon as latest model guidance shows little change in the sea state. Buoy data continues to support swells capable of producing surf up to 9 feet.

* WHAT...Sub-freezing temperatures as low as 30 expected. * WHERE...Western and much of north central North Dakota. * WHEN...Until 9 AM CDT /8 AM MDT/ this morning. * IMPACTS...Sensitive outdoor plants may be killed if left uncovered. Take steps now to protect tender plants from the cold.

* WHAT...Heat index values up to 96 expected. * WHERE...Much of Southern New England, except for the eastern slopes of the Berkshires, the Rhode Island and Massachusetts South Coast, Cape Cod and the Islands. * WHEN...From 11 AM this morning to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures, a moderate degree of humidity with little relief Tuesday night 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.

At 1225 AM CDT, Doppler radar was tracking strong thunderstorms along a line extending from 9 miles east of Watersmeet to near Kentuck Lake Campground to near Crandon to 8 miles southwest of White Lake. Movement was east at 45 mph. HAZARD...Wind gusts up to 40 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Strong thunderstorms will be near... Crandon, White Lake, Headwaters Wilderness, North Otter Creek

At 1225 AM CDT, Doppler radar was tracking a cluster of strong thunderstorms 9 miles southeast of El Cenizo, or 17 miles north of San Ygnacio, moving southeast at 40 mph. HAZARD...Wind gusts up to 50 mph and half inch hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Bustamante. This includes US Highway 83 between mile markers 738 and 746.