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Climate Prediction Center


February - April 2010


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Latest Seasonal Assessment - Heavy precipitation continued to slowly ease the drought in central and southern sections of the Far West during the last half of January 2010. Record totals fell on many locations across Arizona and southern California, with some Arizona sites receiving a typical years worth of precipitation over the course of a few days. Drought should continue to ease in this region, with more limited relief expected farther north through southern Oregon. To the north and east, drought in Washington and along the Idaho/Montana border is expected to persist and expand to cover much of eastern Washington, northern Idaho, and adjacent Montana. Meanwhile, limited relief is expected for drought areas along and near the Idaho/Wyoming border. Limited relief is also forecast for the drought affecting part of the western Great Lakes region, primarily later in the period, but more robust relief appears on tap for the lingering drought areas in southern Texas. Across western Ohio and adjacent parts of Indiana and southeastern Michigan, subnormal precipitation totals have been observed for the past several weeks, and with this pattern expected to continue through the forecast period, drought development is anticipated in these areas. Finally, drought has expanded to cover all of Hawaii Island, and by the end of April, drought is expected to cover the entire state.

Discussion for the Seasonal Drought Outlook

Tools used in the Drought Outlook included the official CPC precipitation outlook for February 2010 and the long lead forecast for February - April 2010, the four-month Palmer drought termination and amelioration probabilities, various medium- and short-range forecasts and models such as the 6-10 day and 8-14 day forecasts, the soil moisture tools based on the GFS model and the Constructed Analogue on Soil (CAS) moisture, the Climate Forecast System (CFS) seasonal precipitation forecasts, El Niño precipitation and temperature composites for February - April 2010, climatology, and initial conditions.

Moderate to severe drought continues in northwest Wisconsin. Medium-range forecasts call for enhanced chances of below-normal precipitation thru mid-February, with longer-range forecasts non-committal. Based on the typical snowmelt and increased precipitation that occurs as spring progresses, some limited improvement appears on tap for the region by the end of April. However, since relief is expected only later in the period, uncertainty is high.
Forecast confidence for Wisconsin is low.

Continued relief for the residual long-term drought areas in parts of southern Texas appears likely through the late winter and early spring. Short- and medium-range forecasts call for above-normal precipitation, and the latest monthly and seasonal forecasts continue to indicate relatively high probabilities for wetter than median conditions during February - April. This is consistent with typical conditions for the region during El Niño.
Forecast confidence for Texas is high.

Wetter than normal conditions are forecast on all time scales relevant to this forecast across all but the northernmost tier of the steadily-easing drought still covering parts of California, Nevada, Arizona, and adjacent areas. A series of storms brought heavy to record-setting precipitation to the southern part of the area in late January 2010, and while only moderate precipitation is anticipated in early February, outlooks for the 6-10 day, 8-14 day, 1-month, and 3-month periods all indicate enhanced chances for above-normal precipitation. Only in the northern tier of the drought region, primarily across southern Oregon, is relief expected to be less robust.
Forecast confidence for the Southwest, Great Basin, California, and southern Oregon is high.

Drought conditions should continue across central Washington and along the Idaho/Montana border, and are forecast to expand through the area between these two regions in eastern Washington and much of the Idaho Panhandle. Some expansion is also expected near the current drought area in Montana and central Idaho as well. Forecasts on all time scales indicate at least slightly enhanced chances for below-normal precipitation through these areas, which is consistent with typically-observed conditions during El Niño events.
Forecast confidence for Washington, northern Idaho, and western Montana is high.

Drought along and near the Idaho/Wyoming border expanded northwestward along the Idaho/Montana border (discussed above), and reaches southward into a small part of northern Utah. Near- to below-normal precipitation is favored in these regions through mid-February 2010 while longer-term precipitation amounts are uncertain. Some improvement is forecast based on some indications for at least near-normal precipitation for the period, but mid-February through April 2010 precipitation will be critical in determining whether or not mountain snowpack ends up deficient before snowmelt recharge begins in earnest, and the uncertain forecast for this period leads to a low confidence drought forecast.
Forecast confidence for southeastern Idaho, western Wyoming, far southwestern Montana and northern Utah is low.

Over much of western Ohio, southeastern Michigan, and adjacent northeastern Indiana, short-term precipitation deficits have been observed, below-normal precipitation is favored through mid-February, and the February - April seasonal forecast calls for enhanced chances of below-normal precipitation. These longer-term forecasts are consistent with conditions typically observed during El Niño events in the region. Because of antecedent normal to wet moisture conditions, any drought development would likely take place later in the forecast period, a fact which inherently adds uncertainty.
Forecast confidence for Ohio is moderate.

As is consistent with an ongoing El Niño, Hawai'i is expected to receive below-median precipitation during this period. These dry conditions will likely exacerbate ongoing areas of severe to extreme drought over Hawai'i and also provide support for drought development over the remainder of the island chain. In early February 2010, drought expanded eastward to cover all of the Big Island.
Forecast confidence for Hawai'i is high.

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Climate Prediction Center
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Page Author: Climate Prediction Center Internet Team
Page last modified: February 4, 2010
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