Expected

* WHAT...Sub-freezing temperatures as low as 20 expected. * WHERE...Arco/Mud Lake Desert and Upper Snake River Plain. * WHEN...From midnight tonight to 9 AM MDT Tuesday. * 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 Lake Wind Advisory for American Falls Reservoir, north winds 10 to 20 mph with gusts up to 30 mph. For the Freeze Warning, sub-freezing temperatures as low as 20 expected. * WHERE...Lower Snake River Plain. * WHEN...For the Lake Wind Advisory, until 9 PM MDT this evening. For the Freeze Warning, from midnight tonight to 9 AM MDT Tuesday. * IMPACTS...Strong winds and rough waves on area lakes will create hazardous conditions for small craft. Frost and freeze conditions

* WHAT...Heat index values up to 98. * WHERE...In New Jersey, Mercer, Camden, Gloucester, and Northwestern Burlington Counties. In Pennsylvania, Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia Counties. * WHEN...Until 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Record setting high temperatures are quite possible through Wednesday, with maximum heat indices nearing 100 degrees during peak heating each afternoon. Given the intensity of

* WHAT...Heat index values up to 98 expected. * WHERE...Western Monmouth, Middlesex, Ocean, and Southeastern Burlington Counties. * WHEN...Until 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Record setting high temperatures are quite possible through Wednesday, with maximum heat indices nearing 100 degrees during peak heating each afternoon. Given the intensity of this early season stretch of heat and humidity, we are not

* WHAT...Heat index values up to 97 expected. * WHERE...In New Jersey, Morris, Somerset, Warren, and Hunterdon Counties. In Pennsylvania, Berks, Lehigh, Northampton, Upper Bucks, Western Chester, and Western Montgomery Counties. * WHEN...Until 8 PM EDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Record setting high temperatures are quite possible through Tuesday, with maximum heat indices of 95 to near

* WHAT...Heat index values up to 98. * WHERE...In Delaware, New Castle County. In Pennsylvania, Eastern Chester County. * WHEN...Until 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Record setting high temperatures are quite possible through Wednesday, with maximum heat indices nearing 100 degrees during peak heating each afternoon. Given the intensity of this early season stretch of heat and humidity, we are not

* WHAT...Heat index values up to 95 expected. * WHERE...Western and Central Hillsborough, Eastern Hillsborough, and Interior Rockingham Counties. * WHEN...From 11 AM to 8 PM EDT Tuesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...It will remain warm Tuesday night as overnight lows only dip into the lower 70s. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning

At 221 PM EDT, Doppler radar was tracking a strong thunderstorm near Kokomo, moving northeast at 45 mph. HAZARD...Winds in excess of 40 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Kokomo, Greentown, Sharpsville, and Indian Heights. If outdoors, consider seeking shelter inside a building. A Severe Thunderstorm Watch remains in effect until 600 PM EDT for central Indiana.

* WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Portions of northwestern and southwestern South Dakota and northeast Wyoming. * WHEN...From midnight tonight to 9 AM MDT Tuesday. * 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.

* Timing...Until 10 PM CDT tonight. * Wind...Southwest at 25 to 35 mph with gusts up to 55 mph. * Humidity...As low as 4 percent. * Fuels...Critically dry to extremely dry. * Impacts...Any fires that develop can spread rapidly. Outdoor burning is discouraged. A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.