2013年8月 Saint 云 天气 Summary

Summer 温度 in Fits and Starts, But Another Late Summer Dry Spell

Saint 云 天气 Summary for 2013年8月 and 2013年夏天

发布: 2013年9月2日星期一上午11:03

8月6日最干燥，7月- 8月的组合

While summer weather nearly had a one month sabbatical in July and August, the dry trend that began in July intensified in August. 只有0.圣乔治大教堂的降雨量为85英寸. 云 Regional Airport, nearly three inches below the average total of 3.79英寸. 这使得2013年8月成为 第六个最干燥的八月 在圣. 云记录. 事实上，只有2个.自7月1日以来降雨量为28英寸， 七月至八月是圣. 云记录 也是32年来最干旱的一次. This continues a trend of dry spells that have hit St. 云 from some time in the summer and continued into some part of the fall. Five of the past six years have had a dry spell during which St. 云 rainfall was at least four inches below average. 到目前为止 2013 dry spell has the second largest deficit in those 6 years and has built up the shortfall in the shortest time.

干燥的环境已经改变了 春季湿润转为中度干旱 条件，如所见 美国干旱监测. 到8月29日, more than 55% of Minnesota ranked in moderate drought 与 66% of subsoil moisture reported as being short in the 最新的明尼苏达州作物周报. Since the last week of June, much of central Minnesota has seen rainfall 比平均水平低5-7英寸, according to the Drought Report from the Minnesota State Climatology Office.

The one saving grace of this dry period has been below average incidents of severe weather. The most widespread severe weather outbreak in August was a hail storm that basically paralleled I-94 on its south side 从奥顿维尔到双子城. 有一个 弱龙卷风着陆 near Hill City in Aitkin County on August 29, but there have only been 目前明尼苏达州有9起龙卷风报告.

After A Month Off, Summer Resumed in Late August

August also finally broke the vacation from summer weather that began in mid-July. 平均St. 八月的云温为69度.7°F, 1.比平均温度高9华氏度. That warmth marked a huge turnaround in the last two weeks of August.

Heat Wave Produces Six Daily Temperature 记录s, But Not Extraordinary Heat

到8月15日. 云的平均温度是64度.0°F, 5.比平均温度低1°F. That statistic, had it held through the month, would have ranked as the 最酷的8月9日 在圣. 云记录. 8月19日，圣. 云 completed a string of 28 straight cooler than average days. The high of 88°F was the first day 与 a high of at least 85 degrees since July 22. Conditions rapidly turned around at that point. The last 16 days of August averaged 74.9华氏度，也就是 有记录以来最热的第四个八月. During August 19-29, there were 7 days 与 a a 最高气温至少90度. Only 6 days had 90-degree days before then. 在这11天里, the high was never cooler than 85 degrees and there were only two days 与 a low cooler than 60 degrees. This included a four-day heat wave 8月24日-27, during which 6 .每日记录暖温S被打破了. There were also three nights during which the low temperature stayed at 70 degrees or warmer. Those warm nights produce the worst heat stress for people who don't have the opportunity to cool off during a heat wave. The hottest temperature was the 95°F, which broke 8月26日创纪录的高温. 然而，这仅仅是 tied May 14 for the hottest temperature of the summer. The heat wave was far short of the record August heat wave (7 straight days on August 18-24, 1976) and did not equal the most recent heat wave of 5 days during June 30-July 4, 2012. 持续产生的热量 one of the hottest average high temperatures 在州博览会的历史上.

Overall, the temperature trend for the summer showed a 酷暑休息一个月 从七月中旬到八月中旬. This produced a summer (June 1-August 31) average temperature of 68.5°F, 0.比平均水平高6华氏度.

The hot temperatures forced evaporation rates higher, so the effect of the dry conditions were worse during the heat the second half of the month. This frequently produced high fire danger rankings in northern and central Minnesota.

The major weather pattern shift was causing by a drastic shift of the steering winds. 在这个月的上半月, there were a series of storm systems moving southeastward from the Canadian Rockies into the Northern Plains and most of the East Coast. While the bulk of the rainfall missed Minnesota, 不像春天发生的事, this did allow cooler air masses to move from central Canada into the Northern Plains. During the second half of August, the steering winds stayed near the US-Canadian border. 在热浪中, the strong high pressure area that had given the heat and dry conditions to the Southern Rockies and Texas for much of the summer moved towards Nebraska, 保持所有, but the Canadian border area in the searing heat.

Relief At September Start, But Warmer Than Average to Return

The bulk of the Labor Day weekend has seen major relief from the heat as highs have been knocked down into the 70's and overnight lows have dropped into the 50's and 40's. 然而, most forecasts have the main belt of steering winds being shoved north of the Canadian border again to the west of the Great Lakes. That pattern would bring temperatures back into the 80's by mid-week. 此时此刻, 90年代看起来是不可能的, but this pattern could bring more frequent thunderstorms at least into the general area, so it is possible that we might see better chances of important rainfall by late in the week.

    2013年8月统计数据

Summer (June 1-August 31) 2013 Statistics