Severe

* WHAT...Dangerously hot conditions. Afternoon temperatures 109 to 121 expected. Major to Extreme Heat Risk. * WHERE...Portions of southwest Arizona and southeast and southern California. * WHEN...From 10 AM MST /10 AM PDT/ Thursday to 8 PM MST /8 PM PDT/ Sunday. * IMPACTS...Increase in heat related illnesses, including heat cramps, heat exhaustion, and heat stroke. Heat stroke can lead to death. An Extreme Heat Warning means that a period of very hot temperatures,

* WHAT...Dangerously hot conditions. Afternoon temperatures 108 to 113 degrees. Major Heat Risk. * WHERE...The Phoenix metropolitan area. * WHEN...Until 11 AM MST Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * ADDITIONAL DETAILS...In Maricopa County, Call 2-1-1 to find a free cooling center, transportation, water and more.

* WHAT...Dangerously hot conditions. Afternoon temperatures 110 to 116 degrees. Major Heat Risk. * WHERE...In Arizona, Parker Valley and Yuma. In California, Imperial Valley, and Palo Verde Valley. * WHEN...Until 11 AM MST /11 AM PDT/ Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.

Strong thunderstorms will track across the area with a humid air mass supporting torrential downpours. These will be capable of producing flash flooding. * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of central, northeast, and northern Maryland, including the following areas, in central Maryland, Anne Arundel and Central and Southeast Howard. In northeast Maryland, Cecil. In northern Maryland, Northern Baltimore, Northwest Harford, Southeast Harford and Southern Baltimore.

FFWCTP The National Weather Service in State College has issued a * Flash Flood Warning for... Northeastern McKean County in north central Pennsylvania... * Until 500 AM EDT. * At 154 AM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 2 inches of rain have fallen. The expected rainfall rate is 1 to 2 inches in 1 hour. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly.

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of central New York, including the following counties, Broome, Chenango and Otsego and northeast Pennsylvania, including the following counties, Susquehanna and Wyoming. * WHEN...From 11 AM EDT this morning through Wednesday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of central New York, including the following areas, Delaware and Sullivan and northeast Pennsylvania, including the following areas, Lackawanna, Luzerne, Northern Wayne, Pike and Southern Wayne. * WHEN...From 11 AM EDT this morning through Wednesday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations.

SVRCLE The National Weather Service in Cleveland has issued a * Severe Thunderstorm Warning for... Ottawa County in northwestern Ohio... Northwestern Sandusky County in northwestern Ohio... Northeastern Wood County in northwestern Ohio... Northeastern Lucas County in northwestern Ohio... * Until 245 AM EDT. * At 159 AM EDT, a severe thunderstorm was located near Genoa, or 11 miles southeast of Toledo, moving southeast at 40 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Minor damage to vehicles is possible.

FFWTWC The National Weather Service in Tucson has issued a * Flash Flood Warning for... Southwestern Cochise County in southeastern Arizona... * Until 130 AM MST. * At 1031 PM MST, Doppler radar indicated thunderstorms producing between 1 and 3 inches of heavy rain across southwest Cochise county. A trained weather spotter in Hereford reported 3 inches had fallen in the last hour. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding.