Weather Summary: A cool front brought showers and thunderstorms to the central and northern Plains and Upper Midwest early during this U.S. Drought Monitor (USDM) week, but it weakened as it scraped against high pressure over the eastern U.S., dropping minimal precipitation in the Ohio Valley. Another front brought limited rain later in the period. Tropical Storm Debby inundated Florida with flooding rains beginning Saturday, June 23. Areas of rain peppered the Northeast and Mid-Atlantic States as the fronts limped eastward. An upper-level trough brought waves of rain to parts of the Pacific Northwest and extreme northern Rockies, and small areas of very light convection developed in the Southwest as the summer monsoon tried to get started. Otherwise, upper-level high pressure dominated with hot, dry, and windy weather blanketing much of the West and central Plains. The hot and dry air mass spread eastward as the week progressed. It was a drier-than-normal week for Puerto Rico but the precipitation pattern was mixed for Alaska and Hawaii.
The Northeast and Mid-Atlantic: Areas of showers and thunderstorms moved across the Northeast this week with rains locally over 2 inches along the coast and in Maine. Above-normal rain fell over the D0 (abnormally dry) areas of Massachusetts and Connecticut, but it was not enough to ease long-term deficits. The week was drier than normal further inland. With above-normal temperatures and limited rainfall, topsoil moisture continued to decline in most states. According to June 24 reports from the U.S. Department of Agriculture (USDA), 55% of the topsoil in Maryland was short or very short (dry or very dry). Spots of D0 were added to southeast New York and northern Vermont-northeast New York where deficits from 7 days to 6 months were greatest. D0 and D1 (moderate drought) expanded into the Washington, D.C. area and adjacent northern Virginia where rainfall has been spotty, deficits abound, and yard impacts were being reported. D0 expanded in central and south central Virginia.
The Southeast and Deep South: Tropical Storm Debby dropped 5 inches or more of rain over most of the Florida drought areas, with widespread 10+ inch storm totals. Up to 23 inches of rain was reported by a CoCoRaHS observer in Wakulla County. The tropical inundation all but eliminated drought from Florida. Only a small patch of D0 (with an L impact designation) remained along the southwest coast where Debby’s rainfall totals of only an inch or two did little to eliminate deficits which have accumulated over several months. D0 also remained over parts of the Florida panhandle. Extreme southern and southeast Georgia received rain from the northern edge of Debby, with pullback of the southern edge of the D0-D4 (exceptional drought) areas.