As a result, abnormal dryness increased in coverage and moderate drought was introduced in a few areas along Virginia’s border with Maryland and West Virginia. In northern Virginia, short-term precipitation deficits mounted along with decreasing streamflow and soil moisture values. Severe drought held on in some areas between Tampa and the Big Bend, where soil moisture deficits and longer-term precipitation deficits remained more severe. The above-normal precipitation amounts alleviated short-term precipitation deficits in the western Florida Peninsula and raised streamflows, leading to widespread improvement to drought conditions. Heavy rains fell in the central and southern parts of the Florida Peninsula this week, with amounts reaching or exceeding 4 inches in some areas. A few areas that saw higher precipitation amounts this week, including the fringes of the abnormally dry areas in New England, saw localized improvements out of dry conditions. Philadelphia reported its driest May on record, with only 0.24 inches of rainfall. As a result, drought and abnormal dryness expanded across much of the western half of the region, especially from western New Jersey through Pennsylvania and New York, as well as northern Virginia and eastern West Virginia. More generally over the last few weeks, especially across the western half of the Northeast, streamflows and soil moisture are very low, amid unusually hot temperatures and high evaporative demand for this time of year. Coastal areas tended to be cooler than normal this week, with isolated spots coming in 4 to 6 degrees below normal. Temperatures were mostly above normal across the western half of the region, with localized readings ranging from 4 to 6 degrees warmer than normal. Pennsylvania, New York, Maryland, New Jersey, Delaware and southern New England saw primarily dry weather this week. Degradations were made in a few parts of western Montana and northwest Washington, where precipitation deficits mounted amid declining soil moisture and streamflow. In the West, some minor improvements occurred in parts of Nevada, Utah and Idaho, where high streamflows and large precipitation amounts from the winter into May led to a reassessment of conditions. Widespread degradations occurred in the Midwest and western portions of the Northeast, amid very dry and warm recent weather. Heavy rains in the central and southern Florida Peninsula also led to improvements to ongoing drought and abnormal dryness in the southwest Florida Peninsula. The same idea applies to the precipitation normal values, except enhanced odds forĪbove- (below-) normal precipitation values are green (brown).Heavy rains fell this week across some of the western parts of the Central and Southern Great Plains, especially in the Texas Panhandle and western Oklahoma and Kansas, leading to widespread improvements to ongoing drought in the western Great Plains. If the selected point is within an area of enhanced odds forīelow-normal temperatures, the shading around the normal maximum/minimum temperature will appear blue. If the selected point is withinĪn area of enhanced odds for above-normal temperatures, the shading around the normal maximum/minimum temperature will appear red. The color used to highlight the normal values (precipitation or maximum/minimum temperature) are used to delineate the category of the forecast at the point clicked. What does the highlighting around the normal precipitation or normal maximum/minimum temperature imply? What color scheme is used? The color scheme follows that of the static images for the 6-10 day forecasts and 8-14 day forecasts. Intervening values are linearly interpolated, combined with data from the COOP, and averaged over the 5-day period to createĪverage maximum/minimum temperature normals. For temperatures, monthly average maximum/minimum temperatures are assigned to theġ5th of the current month and subsequent month. These values are then summed over the 5-day period to create total precipitation normals. PRISM data are inherently available as monthly values.įor precipitation, daily average values are calculated (Monthly Total/Number of Days in Month) and combined with data from the Cooperative Observer Network (COOP). PRISM (Parameter-elevation Regressions on Independent Slopes Model) normals are used in this display. Many thanks to the staff there for developing the prototype and assisting in the transition to CPC.įAQ What climatologies are used in this display? This webpage was developed in conjunction with the Weather Forecast Office in Pendleton, Oregon (WFO PDT).
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