Musings: Upcoming Winter Could Be A Repeat Of Last Year's Winter

Recently, ImpactWeather, a Houston based weather forecasting and consulting firm, held a webinar in which they discussed their view of the weather trends that will impact temperatures and precipitation in the United States during both the next 30 days and the winter period of December through February. The bottom line is that the developing La Niña in the South Pacific Ocean is controlling the weather patterns. So far the pattern has allowed an active hurricane season to develop but has contributed to only a few of the storms entering the Gulf of Mexico and making landfall on the U.S. coast.

ImpactWeather showed a chart that contained the various global sea surface temperature (SST) anomalies that are influencing global weather patterns. ENSO (El Niño/La Niña Southern Oscillation) is probably the most prominent SST anomaly, but the Pacific Decadal Oscillation (PDO) Pattern, the Atlantic Multi-decadal Oscillation (AMO) Pattern and the Indian Ocean Dipole (IOD) Pattern are also strong weather influencing factors. As shown in the accompanying chart (Exhibit 3), ENSO and PDO are in their cold phase while the AMO and IOD are in their warm phase.

Exhibit 4. La Niña Dominates Winter Weather
 
Source: ImpactWeather

The impact of the PDO and La Niña phases is best shown by the forecasts showing the deviation in temperatures that can be expected in the future as a result of these patterns. As shown in Exhibit 5, the 2011-2012 winter forecast shows that temperatures should average between 1°C and 1.4°C below normal. The forecast for November called for a 1.4°C lower temperature range, which would seem to be consistent with the cooling that has been experienced since late October. The chart shows a multitude of temperature forecasts generated by computer models, virtually all of them showing negative deviations. If one compares the forecasted temperatures for this winter with the temperatures experienced last winter (the far left side of the chart), they look similar, but the forecasted temperature anomalies don't show the move back to zero as experienced last summer. That would suggest that in the United States we may not experience the extreme heat witnessed last summer. That doesn't mean that the drought conditions will end, but lower temperatures would be a welcome relief......Read the entire Musings From The Oil Patch Article.


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