Updated May Outlook from the Climate Prediction Center
The Climate Prediction Center (CPC) updated its May forecast on Sunday. Several changes were made from the original outlook, only issued 10 days previously on April 20th. In the temperature forecast, colder than normal conditions were introduced across the Ohio Valley and Great Lakes into the Mid Atlantic. The earlier outlook had neutral to warmer than average weather, which has now been confined to the Deep South and Southwest.
— NWSCPC (@NWSCPC) April 30, 2017
The precipitation forecast has some changes as well. An area of above normal precipitation has been expanded in the West and from the Deep South into the Northeast. Drier than normal conditions have been added along the Oregon and Northern California Coasts. Another below normal precipitation region has been shifted to the Central Plains from the Great Lakes.
Our final outlook for the month of May forecasts wetter than usual conditions for the Rockies and Appalachians. http://www.cpc.ncep.noaa.gov/products/predictions/long_range/lead14/
The CPC notes that neutral water temperatures are still being found in the Pacific Ocean. Therefore, no influences are expected in May from an El Nino or La Nina. Forecasters relied heavily on current overall meteorological trends, along with weather model predictions. The month is expected to start much cooler than normal over most of the East, leading to the diminished above average temperature forecast.
— NWSCPC (@NWSCPC) April 27, 2017
The precipitation outlook was revised based on an active weather pattern to start the month from in the Rockies and from the Gulf Coast into the Northeast. The active pattern is expected to continue in the mountains in the later half of the month as well.
— NWSCPC (@NWSCPC) April 28, 2017
For WeatherNation: Meteorologist Mace Michaels