Historic warmth in March slashed this year's U.S. maple syrup output as much as 40 percent as sugar maple trees, which need freezing temperatures at night to sustain sap production, dried up early or largely produced bad-tasting syrup.

The mild winter led to at least one unexpected consequence: many more costly collisions between cars and wildlife on American roads.

There's no question it's dry in New Mexico. Many argue that's an understatement, including Gov. Susana Martinez.

Crews battled to contain wind-whipped Arizona wildfires on Wednesday that have raced across 27 square miles of parched ponderosa forest, brush and grassland, consuming several buildings and threatening a small town.

Three-day forecast for the entire US, updated each morning and afternoon. (Weather.com)

Meteorologists say unseasonable weather pushed last month to the fifth warmest April on record worldwide.

The first tropical storm of the year formed in the Pacific Ocean southwest of Mexico on Monday and was named Aletta, the Miami-based National Hurricane Center said.

As the climate changes over the next century, the ranges of nearly 90 percent of mammal species will shrink — in many cases because animals won't be able to get to areas where the climate is going to become suitable for them, says new research.

On an arid plain where sudden gusts of wind can rip roofs off buildings and knock over tractor trailers, Mexico is building a new engine for its energy future.

...CRITICAL FIRE WEATHER CONDITIONS RETURNING FRIDAY... .AN UPPER LEVEL TROUGH WILL BE CROSSING THE GREAT BASIN FRIDAY WITH AN INTENSIFYING LEE TROUGH DEVELOPING OVER THE TEXAS PANHANDLE INTO FAR WEST TEXAS. THIS WILL TIGHTEN THE SURFACE GRADIENT OVER THE REGION WITH WEST TO SOUTHWEST WINDS OF 20 TO 30 MPH LIKELY. THESE WINDS COMBINED WITH RELATIVE HUMIDITIES

...RED FLAG WARNING IN EFFECT FRIDAY AFTERNOON AND EARLY EVENING ACROSS THE GUADALUPE MOUNTAINS AND THE SOUTHEAST NEW MEXICO PLAINS FOR 20 FOOT WINDS OF 20 MPH OR GREATER...MINIMUM RH/S OF 5 TO 10 PERCENT AND HIGH FIRE DANGER... .VERY WARM TEMPERATURES...BREEZY CONDITIONS...AND VERY LOW RELATIVE HUMIDITY WILL LEAD TO CRITICAL FIRE WEATHER CONDITIONS FRIDAY AFTERNOON

...AIR POLLUTION WATCH LEVEL ORANGE... AIR POLLUTION WATCH - LEVEL ORANGE - FOR DALLAS-FORT WORTH. THE TEXAS COMMISSION ON ENVIRONMENTAL QUALITY (TCEQ) HAS ISSUED A LEVEL ORANGE AIR POLLUTION WATCH FOR THE DALLAS-FORT WORTH AREA FOR FRIDAY, MAY 18, 2012. ATMOSPHERIC CONDITIONS ARE EXPECTED TO BE FAVORABLE FOR PRODUCING

...THE FLOOD WARNING CONTINUES FOR THE FOLLOWING RIVERS IN TEXAS... RIO GRANDE AT DEL RIO AFFECTING VAL VERDE COUNTY THE FLOOD WARNING CONTINUES FOR THE RIO GRANDE AT DEL RIO. * AT 07AM THURSDAY THE STAGE WAS 2.4 FEET 0.7 METERS * FLOOD STAGE IS 4.0 FEET 1.2 METERS

...THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON HAS ISSUED A FLOOD WARNING FOR THE FOLLOWING RIVERS... NAVIDAD RIVER NEAR SUBLIME AFFECTING LAVACA COUNTY AFFECTING THE FOLLOWING COUNTIES IN TEXAS...LAVACA FOR THE NAVIDAD RIVER, AT SUBLIME, MODERATE FLOODING IS OCCURING AND IS EXPECTED TO CONTINUE.