Sea-surface temperatures across the central and eastern Equatorial Pacific Ocean continue to be colder than average and have not changed much during the past month. This indicates that the weak La Nina phase is persisting at the present time.
Most long-range climate models are still advertising that this La Nina will weaken to more of a neutral phase over the next few months. How quickly this transition takes place will have to be monitored.
As for the April temperature outlook, slightly below normal temperatures are forecast across portions of the Northeast, Mid-Atlantic, and central Appalachians. This is partly due to the NAO (North Atlantic Oscillation), which is predicted to go negative during the month of March and may remain that way into parts of April. This trend favors periods of colder temperatures across these regions of the country in April. Parts of the Pacific Northwest may also see slightly below normal temperatures.
A surplus of late season heating degree days of between 20 and 40 is projected throughout these regions. In contrast, slightly above normal conditions are expected across portions of the Desert Southwest, southern Plains, and south-central Florida. On a whole, temperatures throughout much of the north-central Plains, Midwest, and Southwest will average closer to normal during the month of April