Weatherwatch june 2004

摘要

The boundary between cool and warm air that helped trigger May downpours in the Midwest shifted south in June. As a result, cooler, drier air gradually overspread the Midwest, while the South became the new focus for heavy rainfall, especially during the second half of June. Rain eased or eliminated the effects of winter and spring dryness in the Southeast, but .caused sporadic flooding from southern and eastern Texas to the Delta. Rainfall also increased in coverage and intensity across the southern half of the Plains. Farther north, however, long-term drought remained deeply entrenched from western Nebraska into southeastern Montana, despite occasional showers. Similarly, scattered showers across the central Rockies and Intermountain West brought superficial improvement but provided little relief from a multi-year drought. Drought-reduced water supplies also remained a concern elsewhere in the West, although a lack of extreme heat helped to limit demands on irrigation reserves.