06/09/2021, 10:58 am EDT

Daily Feature: May 2021 U.S. Climate Rankings

U.S. rankings for temperature and precipitation were almost exactly in the middle of the 127-year climatology. However, as is often the case, normal (nationally) can be the average of extremes.
06/08/2021, 9:04 am EDT

Early June U.S. Rainfall Deficits Increasing Rapidly!

Rainfall required to neutralize dry Palmer Drought Severity Index (PDSI) has increased dramatically during early June in the East U.S. Already steep departures across the West U.S. have also worsened. The California and Washington/Oregon (along the Cascades) rainfall deficits are off-the-chart >15 in.
06/02/2021, 8:09 pm EDT

FINAL 2021 North Atlantic Tropical Cyclone Season Forecast

The Climate Impact Company North Atlantic tropical cyclone season forecast of seasonal activity for 2021 is updated. The seasonal forecast activity is lowered slightly although the number of intense hurricanes increases from 2 to 3. The ACE index lowers sharply to 106 (from 127).
06/02/2021, 10:47 am EDT

MJO shifts to the tropical North Atlantic next week. Supports tropical cyclone development.

During neutral ENSO, the Madden Julian oscillation (MJO) is normally active. During northern hemisphere summer, influence of the convection phase of the MJO causes an increase in wet monsoon moisture and tropical cyclone risk in neighboring longitudes. The ECMWF 14-day MJO forecast indicates anomalous convection in the tropical West Pacific (now) shifts eastward and across the tropical North Atlantic in 8-14 days.