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Showing posts from June, 2012

Preliminary Climate Summary for June, 2012

Preliminary Climate Summary for June, 2012 Mean monthly temperatures for June were 2 to 5 degrees F warmer than normal, the 9th consecutive month with warmer than normal conditions going back to last September (2011). In fact the first half of this year has been warmer than any year since 1987. Extremes for the month ranged from 98 degrees F at New Ulm (June 27) to 30 degrees F at Embarrass (June 1st). Some observers reported 7 days with high temperatures of 90 degrees F or higher, and the National Weather Service had to issue Heat Advisories (Heat Index up to 105 degrees F) for a some areas. On a few days and nights dewpoints climbed into the 70s F, making for uncomfortable sleeping. Minnesota did not report the lowest temperature in the nation on any days during the month of June.

Rainfall for June was generally above normal for most observers (the 3rd consecutive month for some), except for those in northwestern and southwestern counties, most of which reported …

Another Traumatic June Flash Flood

Another Traumatic June Flash Flood Following the devastating flash flooding in Goodhue, Rice, and Dakota Counties last Thursday and Friday (June 14-15) and the hail and wind storms of June 17 and 19 earlier this week (hail up to 1.5 inches in diameter and wind gusts up to 83 mph), another larger and more traumatic flash flood encompassed much of northeastern Minnesota over June 19-21 (Tue-Thu) this week. A slow moving thunderstorm complex brought 3 to 10 inches of rainfall over portions of Cook, Lake, St Louis, Carlton, Itasca, Cass, Crow Wing, and Aitkin Counties. A report filed by a National Weather Service employee in NE Duluth mentioned a measurement of 10.10 inches of rainfall in the northeastern part of Duluth. Officially the National Weather Service in Duluth reported new record daily rainfalls back to back, 4.14 inches on the 19th, followed by 3.11 inches on the 20th, for a total of 7.25 inches. The climate record from Duluth shows very few stormy periods that …

Strong winds on Sunday, June 10th

Strong winds on Sunday, June 10th Both weekend days (June 9-10) brought temperatures in the 90s F to many areas, including 93 F at Milan and Crookston, and 94 F at Wheaton and Madison. Then, late afternoon and evening on Sunday, June 10th saw strong thunderstorms cross the state of Minnesota. A tornado was reported near Belle Plaine in Scott County (preliminary estimates are an EF-0 with winds of 65-85 mph) where some farm buildings were damaged, and there were at least 30 other reports of very strong winds, including 63 mph at Kabetogama Lake up north. Olivia reported winds to 59 mph and MSP airport recorded a wind of 52 mph, just around the time all of the tree damage was reported in the Highland Park neighborhood of St Paul. Many other communities reported winds over 40 mph. The cold front associated with the thunderstorms brought a rapid change in temperature, as the MSP airport reading fell from 87 degrees F to just 69 degrees F between 9:00 pm and 10:00 pm.


Profound warm temperature signal over the past year

Profound warm temperature signal over the past year There have been many reports of the extraordinary warm temperatures which have marked the past twelve months, actually the past 14 months across our region. This trend has been noted by scientists at all measurement scales: Twin Cities; statewide (MN); national (USA); hemispheric (northern); and global. Paul Huttner (MPR), Paul Douglas (Star Tribune), Pete Boulay and Greg Spoden (MN-State Climatology Office), Tom Hultquist and Ross Carlyon (National Weather Service), Professor Robert Weisman (St Cloud State University), and NOAA's National Climatic Data Center have all provided perspectives on this strong warming trend. I thought I might as well share some thoughts as well.

Over the past twelve months (June 2011 to May 2012) in Minnesota, monthly temperature values have been colder than normal only once, during June of 2011. All months since then, with the lone exception of September, 2011 (when temperatures we…

Preliminary Climate Summary for May 2012

Preliminary Climate Summary for May 2012 In the simplest of terms May was warm and wet. Mean temperatures for the month were 2 to 5 degrees warmer than normal, with several days in the 90s F. The extremes for the month were 97 degrees F at Madison on the 18th, and just 24 degrees F at Brimson and Embarrass on the 16th. Minnesota reported the coldest temperature in the nation just twice during the month.

Rainfall during May was abundant and above normal in all areas of the state except the northwest. Many individual climate observers saw their wettest ever May. Some of these included:

Pipestone with 11.06 inches
Windom with 10.83 inches
Lamberton with 9.87 inches
Hawley 6.72 inches
Floodwood 9.14 inches
New Ulm with 12.39 inches
Milaca with 10.46 inches
Sandstone 10.84 inches
Forest Lake with 11.29 inches
Chanhassen with 11.21 inches
Chaska with 10.69 inches

For many observers over half the days of May brought measurable rainfall (16-18 days), and there were many heavy…