From snow to 90 in 5 days in Washington, D.C.: it's possible Jet stream (left) takes big northward excursion into eastern Canada, allowing warm air to bubble up East Coast Monday (right) (StormVistaWxModels.com) A major warm-up is coming to Washington, D.C., and within the matter of a few days. Get ready to power down the heat and crank up the air conditioning. Temperatures Sunday through Tuesday are forecast to be well into the 80s, with 90 degrees not out of the question, especially Monday. Consider just yesterday temperatures struggled to pass 50 and snow and sleet mixed with rain showers passed through the region. Frost advisories cover our north and west suburbs tonight. But the big dip in the jet stream behind the short-lived cold shot is moving out. In its place, a huge bump or ridge of the jet stream is moving in. That will open up the warm air tap, elevating temperatures to some 15-20 degrees above average Sunday through Tuesday. It's weather whiplash. Forecast weather map for Monday shows high pressure off the East Coast, directing warm southwesterly winds through the mid-Atlantic ahead of a cold front in the Midwest. (National Weather Service) The European model forecasts highs of 86, 92, and 86 Sunday, Monday and Tuesday next week at Reagan National Airport. The GFS model is slightly cooler, with forecast highs of 84, 83, and 79. These forecast highs, while unseasonably warm (more characteristic of June), would not be record-breaking. The record highs Sunday through Tuesday at Reagan National are 89, 92, and 95. The combination of the warmth, dry soil conditions, gusty breezes from the southwest, and low humidity, may reignite conditions conducive to the spread of fire. "The area from southern New England and New York state to Virginia and North Carolina seem to be at greatest risk for the wildfire weather," said Accuweather. The U.S. Drought Monitor published today stated the D.C. region is abnormally dry. Rainfall this year is 4.4" below average. Cooler weather and the possibility of some much needed rain showers arrive Tuesday night into Wednesday.