May outlook: Temperatures to jump all around, with storminess in the mix, too
*Driving forces
Like April, the spring pattern over North America should continue to offer considerable variability for the eastern United States. Over the next two weeks, we foresee alternating warmer and cooler and drier and wetter periods.
Check out the latest 15-day model forecasts for temperature and precipitation differences from normal from the American (National Oceanic and Atmospheric Administration), European (European Center for Medium-Range Weather Forecasts) and Canadian (Canadian Meteorological Center) weather agencies:
These sources generally agree on a near- to slightly warmer-than-normal start to May, but little sustained warm or cool weather is anticipated.
The precipitation forecast is more complicated, though, as the models agree on a pronounced fetch of moisture from the Gulf of Mexico into the eastern United States, but notice how the European model positions the boundary west of Washington. Such a pattern has been present over the past week, with the heaviest rain from approaching storm systems tracking to our west and north, as shown below.'>>>
https://www.washingtonpost.com/weather/2021/05/02/washington-dc-may-weather-outlook/?