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"Officially, spring arrives at 11:49 p.m. Friday, but temperatures soared to unseasonably high levels Wednesday with a nearly record 89 degrees at Sky Harbor International Airport, 14 degrees above normal. The heat wave is expected to intensify through the weekend, with highs nearing 95 by Sunday, the National Weather Service said.
Warm weather statewide has triggered an early snowmelt in the mountains. The Salt River is nearing its peak runoff levels almost a month ahead of schedule and could begin to subside in a week. The Verde River is past its peak for the season. "We are at the end of winter," said Larry Martinez, water-supply specialist for the Natural Resources Conservation Service, a federal agency. "Unless something huge happens, we probably have our water supply for the year."
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• The Salt and Verde rivers, key sources of drinking water for the Valley, will produce only about 42 percent of normal runoff by June, Salt River Project officials said Wednesday. SRP's six reservoirs are in better shape than they were last year at this time but are still less than half full.
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The start of spring doesn't mean an end to rain or even mountain snows. Phoenix normally receives about 0.90 of an inch of rain in March and about 0.26 of an inch in April. But the high-pressure system responsible for this week's heat wave suggests to some climate experts the end of the rainy season."
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