2010年9月圣克劳德天气摘要

St. Cloud remained in a stormy weather pattern for most of September, 迎来了25年来雨量最多的9月. 圣保罗的降雨. 云区域机场共7个.16 inches, nearly two and a half times the normal September rainfall of 2.93 inches. 这被列为 九月是英国第三个最潮湿的九月. Cloud records 也是自1985年以来最潮湿的一年. 圣. Cloud was 13.52英寸，足够 4th place . The highest total is again August and September of 1926 with 17.94 inches.

这一年，圣. 云收到了27个.85英寸的降雨，超过了 年平均 of 27.27 inches. 这也更多 而不是整个年份 2003年和2006-2008年的每一年.

8月暴雨天气持续. 云层在较冷的一面

The heavy rains were caused by a continuation of the stormy pattern seen in August. Central Minnesota remained along the battleground between relatively cool and dry Canadian air and the intensely hot and humid air that plagued much of the South Central and Southeastern US for the bulk of the summer months. The change to the September pattern from August is that the average front position was pushed further to the south than in August, so St. 云的天气不那么恶劣, but more frequently got into the area of heavy rainfall that had frequently set up further south during most of the summer months.

Record Minnesota September Rainfall, But Less to North of St. Cloud

Nearly all of Minnesota had well above normal rainfall during September, producing the 全州平均降雨量最高 since recent records began in 1891, according to the 明尼苏达州 Climatology Office. 年平均降雨量6.46英寸比1900多出四分之一英寸. 州平均水平提高了一段 10-13 inch rainfalls statewide in southern Minnesota 就在明尼苏达河以南. There was a huge change across central Minnesota with over 7 inches in much of Sherburne County, but only 4-5 inches in northeastern Stearns and much of Morrison County. Even these lower totals were more than the monthly average, however. 这场九月的大雨之后 very wet summer in spotty areas across the state . Places like Pine City and Detroit Lakes received over 20 inches of rain during the summer, 接近年降雨量的四分之三.

Would You Believe Still Drought in the Arrowhead?

另一方面, the least September rain (3-4 inches) fell from the Brainerd Lakes into the Arrowhead. That area, especially Lake and Cook Counties, continue to suffer from a 中度至重度干旱; according to the statistics from the National Drought Mitigation Center. The Boundary Waters in the northern parts of these counties have been 4-6 inches short of rain during this growing season. 今年夏初，整个 Lake Superior Basin was under the most severe drought conditions in the US , thanks to over 2 years of below normal rainfall, but the heavy August and September rains have greatly eased the shortage along the South Shore of Lake Superior .

September 22-23 Produces Flash Flooding and River Flooding

The biggest contributor to the heavy September rainfall totals was the 9月22日至23日有暴雨 . Nearly 4 inches fell across the southern third of the state with a swath of 降雨量8-12英寸 从布法罗山脊到曼卡托南部. 降雨量达11.06 inches near Winnebago (Faribault County) and 10.安博伊(蓝色地球县)68英寸. The St. 云机场 missed the first wave of rainfall from these storms, so the storm total was 1.57英寸带1英寸.9月23日的52英寸，只有0.少了08英寸 日雨量纪录 .

The heavy rains produced flash flooding in several southern Minnesota towns from Pipestone to Zumbro Falls. Record high levels of water were recorded in several Minnesota streams and rivers, 这在融雪季节之外是很罕见的. Flooding also occurred as the rainwaters moved into the Minnesota and Lower Mississippi Rivers.

幸运的是潮湿的情况, the last week of September and the first week of October have produced a much drier weather pattern, allowing the rivers to fall from their peak after the late September flooding.

9月2日最大地区降雨

香港又下大雨 September 2 brought hail up to golf ball sized in Foley and a 62 MPH wind gust in Sartell in the early morning hours. 这产生了St。. 云是本月最大的降雨，1.下了96英寸的雨 打破日降雨量记录 had it occurred on either the first or the third. It was not the biggest rainstorm of the year, since 2.72英寸落在地上 August 12-13 .

降雨记录被打破

St. 云确实结了一个结。 日雨量纪录 with 1.56 inches of rain on September 6 and set a rainfall record with 1.9月15日的降雨量为58英寸. 9月份总共有4天 至少一英寸的降雨, which ties 1914 and 1926 as the only Septembers with the most days with at least an inch of rain.

Clouds and Frequent Rain Meant Cool September Highs

前线更靠南的位置使圣. Cloud in the cooler air more often, so the average September temperature was 56.8°F, 0.比正常温度低6°F. The coolness was especially felt in the average high temperature of 66.6°F, 4.0°F cooler than normal, and the coolest average high St. 自1993年以来，Cloud就一直拥有. The constant cloudiness and humidity led to the cool average high. Only 9 of the 30 September days had a high of at least 70 degrees. Duluth also recorded relatively few 70-degree highs in September.

The high humidity kept the first frost out of September at the St. 云机场. The temperature reached 30 degrees on October 3, so the first frost was well past 初霜的平均日期 (Sept. 22) and fairly close to the latest 10% of frosts (Oct. 6). However, some places in central Minnesota approached freezing on Sept. 并于9月22日打破了冰点. 26. Here are the 全州平均初霜日期 来自国家气候办公室.

     2010年9月统计数字