Daily SST Anomaly	Weekly SST Anomaly	Monthly SST Anomaly	Seasonal SST Anomaly

Observed Regions OLR Anomalies

850 mb Wind Anomalies 200 mb Wind Anomalies

Latest ENSO Forecasts

CPC CFSv2 Nino 3.4

Arctic Oscillation (AO)

Composite Precipitation and Temperature Impacts

Observed/Forecast AO

Polar Vortex Cross Section

The Arctic Oscillation (AO) is compares 1000 mb height anomalies pole of 20N to those across the middle latitudes. A positive AO suggests a stronger polar vortex with lower pressures near the pole, allowing the middle latitude jet stream to blow strongly and consistently from west to east, keeping colder air locked in the polar region. A negative AO suggests higher pressures in the polar region, weaker zonal winds and the potential for acrtic air to move south into the middle latitudes. (1998 David WJ Thompson and John Michael Wallace)

North American Oscillation (NAO)

Obs. NH 500mb Anomalies	Observed/Forecast NAO	ERSl PSD Forecast	Forecast 700mb Anomalies
Affects on Weather

Pacific North American Oscillation (PNA)

Obs. NH 200mb Anomalies	Observed/Forecast PNA	ERSL PSD Forecast	Forecast 200mb Anomalies
Positive: Ridge (Warm) West and Trough (Cool) East. Negative: Trough (Cool) West and Ridge (Warm) East. Source

Madden-Julian Oscillation

MJO Temperature Impact Composites	MJO Precipitation Impact Composites
Phase 1 during Hurricane season can indicate active period.

Obs. Forecast Phase	OLR Anomalies	850 mb Anomalies	700 mb Anomalies

850 mb Time Lon Winds	200 mb Time Lon Winds	OLR Time Lon

Stratospheric Warming

Zonal Temperature Time Series	Current 1-hPa Analysis	Current 2-hPa Analysis	Current 5-hPa Analysis
Warming usually leads to a cold snap and stronger troughs. Time Series Analyses and Forecasts