Major Hurricane Ian made landfall in southwestern Florida on September 28 and then reemerged offshore of the Atlantic coast, with another landfall near Georgetown, South Carolina two days later. Excessive rainfall (more than 10 inches) caused widespread inland flooding throughout the central Florida Peninsula and heavy rainfall overspread the Carolinas, Mid-Atlantic, and central Appalachians.
After a mid-level low pressure system tracked inland from the northeastern Pacific and became stationary over the interior West, heavy precipitation (1 to 3 inches) occurred across northern Idaho along with the north-central Rockies. Therefore, improvements were made across much of the East and north-central Rockies.
Conversely, a dry week resulted in an expansion of abnormal dryness (D0) and moderate drought (D1) along with intensifying drought conditions across much of the Great Plains, Mississippi Valley, and Midwest. D1 was added to parts of the Pacific Northwest. A mix of improvements and degradations were made to Hawaii, while Alaska and Puerto Rico remain drought-free.
As Hurricane Ian made landfall in southwestern Florida and again along coastal South Carolina, widespread, heavy rainfall supported a broad 1 to 2-category improvement from the Atlantic coast of Florida north to the Carolinas and Virginia.
A 2-category improvement was made to northeastern North Carolina and southeastern Virginia where rainfall amounts exceeded 4 inches which nearly eliminated 60 to 90-day precipitation deficits. A drier-than-normal September and beginning of October along with declining soil moisture (NASA SPoRT) support the addition of moderate drought (D1) to parts of southern Alabama, the Florida Panhandle, and extreme southwestern Georgia. The lack of adequate precipitation since August may reduce the peanut yield.
Due to increasing 30-day deficits and a response in soil moisture indicators, abnormal dryness was expanded throughout Alabama and parts of Georgia and the Florida Panhandle.
Due to a very dry pattern during the past month along with periods of above-normal temperatures, a 1-category degradation was necessary for parts of the Ozarks, lower Mississippi Valley, western Gulf Coast, and southern Great Plains. 30-day precipitation deficits exceed 4 inches in eastern Oklahoma and northwestern Arkansas.
Much of these areas along with interior portions of southeastern Texas have received less than 0.10 inch of rainfall during the past 30 days. 30-day SPI/SPEI along with NLDAS and NASA SPoRT soil moisture were the primary indicators used in depicting these degradations along with recommendations from regional partners. Low to dry ponds, poor pastures, and cattle selloffs continue to be major impacts for Arkansas and Oklahoma.
Although moderate drought (D1) was added to southwestern Louisiana, a broader D1 coverage was not designated this week due to a strong wet signal at 60 days and lack of support from soil moisture indicators. A couple of small D1 areas were added to Tennessee (near Nashville and northeast of Chattanooga), based on SPI/SPEIs and declining soil moisture.
Increasing short-term precipitation deficits, periods of above-normal temperatures, and rapidly declining soil moisture indicators support widespread 1-category degradations throughout a majority of Missouri and parts of Iowa. 30 to 60-day precipitation deficits resulted in an expansion of abnormal dryness (D0) across southwestern Wisconsin and moderate drought (D1) across northern Wisconsin. Unable to display feed at this time.
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Based on 30 to 60-day SPIs and support from soil moisture indicators, a slight expansion of D0 and D1 was warranted for southern and eastern parts of Lower Michigan. Meanwhile, across the Ohio River Valley and eastern Corn Belt, increasing 30-day precipitation deficits led to a larger spatial coverage of D0. D1 was expanded in western Kentucky with the addition of severe drought (D2) in the lower Ohio River Valley, consistent with impact reports such as increasing wildfire activity and the requirement of dredging operations along the Ohio River between Paducah and Cairo.
Large precipitation deficits dating back 120 days support a large expansion of D0-D2 coverage throughout Minnesota. Lake Minnetonka in Hennepin County is down to its lowest level since the 2012 drought.
Short and long-term NDMC blends, SPIs, soil moisture, and crop conditions support a 1-category degradation for southern South Dakota, southwestern Nebraska, and parts of Kansas. Pond levels are low in Kansas and limited soil moisture is available for winter wheat planting. Abundant recent precipitation (locally more than 2 inches) prompted improvements along the western slopes of the Colorado Rockies.
Improvements were also made to northeastern Colorado due to relatively significant precipitation (more than 0.5 inch) this past week. Following heavy precipitation during early August, little to no rainfall for a six week period resulted in an increase in D1 across southeastern Colorado. Beneficial precipitation during the past 30 to 60 days along with improving soil moisture conditions prompted improvements across parts of Wyoming.
Late summer heat and increasing 90-day precipitation deficits of more than 6 inches resulted in the addition of short-term moderate drought (D1) to parts of northwest Oregon and western Washington. This new D1 area is supported by 30 to 120-day SPI values, near record low 28-day streamflows for this time of year, and declining soil moisture.
Conversely, heavy precipitation (1 to 4 inches) supported a broad 1-category improvement across parts of west-central Montana and the impact was changed from SL to L only. 12 to 24-month SPI values continue to support D1+ throughout western Montana.
Based in part on above-normal temperatures during August and September, 1-category degradations were made to parts of southern Idaho. Farther to the north, beneficial precipitation during the past week resulted in a 1-cateogry improvement to northern Idaho.
Although Arizona and much of New Mexico were status quo this week, this region will be reevaluated next week as many areas received more than 0.5 inch of rainfall from September 27 to October 3 and it was a wet Monsoon for the Southwest.
As the remnant low pressure system of Hurricane Ian tracked northward, heavy rainfall overspread southern Maryland, Delaware, and southern New Jersey where 7-day totals ranged from 2 to 6 inches. A broad 1-category improvement was made with this heavy rainfall swath. Despite the heavy amounts across central to southern New Jersey, a 2-category improvement was not made this week given the longer term impacts such as low ground water levels dating back to last winter.
Improvements in the New York City area were due to recent heavy rainfall, and additional improvements may be warranted for this area next week. Eastern New York and southern New England had improvements as well, based on 60 to 90-day SPI and streamflows. Abnormal dryness (D0) was reduced in western New York based on SPI at various time scales, streamflows, and NASA SPoRT soil moisture. The D0 area area across central and eastern Pennsylvania was trimmed slightly with precipitation amounts this past week of near 1”.
From October 6 to 10, mid-level low pressure, the tail end of a front, and enhanced moisture from the East Pacific are expected to bring widespread rainfall (1 to 3 inches) to eastern Arizona, New Mexico, and the northern Texas Panhandle. Elsewhere, across the contiguous United States, little to no precipitation is forecast.
Behind a cold front, below-normal temperatures are forecast to shift southeastward across the central and eastern U.S. The first frost or light freeze of the season may affect the Corn Belt. Above-normal temperatures are likely to persist throughout the northwestern U.S.
The Climate Prediction Center’s 6-10 day outlook (valid October 11-15, 2022) expects a variable temperature pattern during this 5-day period. Below-normal temperatures are most likely across the Rockies and Southwest, while above normal temperatures are favored for the Pacific Northwest and lower to middle Mississippi Valley.
Probabilities for above-normal precipitation are elevated across the southwestern and south-central U.S. with a likely continuation of a drier-than-normal pattern for the Pacific Northwest.