trueCast® | Hi-Res Radar
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autoCast® | Computer Generated Forecasting

Washington, District of Columbia

Long-Range Outlook

Warm weather continues for much of the Eastern US

Precipitation Type Forecasting

In most winter weather events, we see several different precipitation types ranging from snow, sleet, freezing rain, and plain rain. The temperature profile through the middle and lower levels of our atmosphere determine what precipitation type will (read more)

El Nino and La Nina

Sea Surface Temperature Anomalies (SSTA) in the equatorial Pacific alternate between warm and cool periods. The cooling of the equatorial Pacific waters is known as La Nina. The warming of the equatorial pacific waters is known as El Nino. The SST (read more)

Arctic Oscillation and Polar Vortex

The polar vortex is a pool of cold air over the Arctic. This polar vortex develops from the difference in temperatures between the cold arctic air and the warmer air across the southern latitudes. When the polar vortex is strong it remains in place o (read more)

North Atlantic Oscillation

The North Atlantic Oscillation (NAO) is the difference in sea-level pressure between the Icelandic Low and the Azores High. Fluctuations in the pressure differences alter the pattern across the North Atlantic, which has impacts that affect us in the (read more)