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Showing posts from September, 2012

Preliminary September climate summary

Preliminary September climate summary Mean monthly temperature values for most southern Minnesota observers ranged from 1 to 2 degrees F warmer than normal, while several northern Minnesota communities reported monthly means that were 1 to 2 degrees F cooler than normal. The extremes for the month were 98 degrees F at Brownton (McLeod County) on the 12th and just 16 degrees F at Warroad on the 21st. Many observers reported overnight lows in the teens and 20s F and some reported new record lows (for example 19 F at Warroad on the 18th and 16 F there on the 21st were both new daily record lows). Killing frosts were widespread in nearly all areas during the month, but crops were fully mature and suffered little damage. Minnesota reported the coldest temperature in the 48 contiguous states on six days during the month.

The real story for September was the dryness due to absence of rainfall. Many observers reported measurable rainfall amounts on only 2-3 days, resulting …

Cold temperatures, dry air

Cold temperatures, dry air Both Tuesday and Wednesday brought cold temperatures to many northern Minnesota communities. High pressure, clear skies, and a dry air mass were conducive to significant overnight drops in temperature. Some communities set new low temperature records, including

For Tuesday, September 18th:
32 degrees F at Grand Forks, ND
28 degrees F at Wright
27 degrees F at Floodwood
26 degrees F at Kabetogama
24 degrees F at Orr
22 degrees F at Hibbing
21 degrees F at Babbitt
20 degrees F at International Falls and Embarrass
19 degrees F at Warroad (this was the lowest reading in the nation on September 18th)

For Wednesday, September 19th:
27 degrees F at Silver Bay and Grand Marais
25 degrees F at Kabetogama
23 degrees F at Orr
21 degrees F at Warroad
20 degrees F at Embarrass (this was the lowest in the nation on September 19th)

The air was so dry that dewpoints were in the low 20s F, far more typical of late November than mid-September. After relative humidit…

Last gasp for summer September 11th?

Last gasp for summer September 11th? Strong south winds ushered in some very hot air across much of the state on Tuesday, September 11th. Many observers reported afternoon temperatures reaching into the 90s F, and in some locations new record high temperatures were set, including:

99 degrees F at Madison, 97 degrees F at Marshall, Owatonna, and Mankato, 96 degrees F at St Cloud, Lamberton, and Sioux Falls (SD), 95 degrees F at Luverne, and 94 degrees F at Waseca (tied record from 1948). MSP Airport reported 95 degrees F, just 1 degree F shy of the record for September 11th, and the first time a temperature that high has been recorded so late in September since 1939. A cold front caused temperatures to drop by 30-40 degrees F on Wednesday (Sept 12). At Madison in Lac Qui Parle County, the temperature fell from 99 degrees F at 3:30 pm on the 11th to 59 degrees F at 3:30 am on the morning of the 12th. On the St Paul Campus temperatures fell by 36 degrees F in less tha…

Dryness continuing into September

Dryness continuing into September Not only was the 12-day run of the State Fair dry (only .08 inches), but the drought picture worsened across the state according to the latest US Drought Monitor. Some southwestern and south-central counties (9 in total) were placed in the Extreme Drought category this week, while many others continued to be in the Severe Drought category (another 23 counties). Little widespread rainfall has occurred across the state since the week of August 22nd. Normal amounts of September rainfall range from 2.50 to 3.50 inches, but the first week of September brought little relief to most places. Only Orr (1.12"), Rushford (1.15"), Lake City (1.16"), Preston (1.34"), and Lanesboro (1.40") reported over an inch during the first week, while Caledonia received 2.57 inches. Much of this fell with the thunderstorms that crossed the state on September 4th bringing high winds and hail to many areas.

Minnesota Agricultural Stati…