|HydroClim Minnesota - July 2001
A monthly electronic newsletter summarizing Minnesota climate conditions and the resulting impact on water resources.
Distributed on the Wednesday following the first Monday of each month.
State Climatology Office - DNR Waters
WHAT HAS HAPPENED
- June precipitation totals varied widely across
Minnesota. Some portions of south central and east central Minnesota
reported above average June precipitation, whereas the northern one third
of Minnesota finished the month one half inch to one inch below normal.
Elsewhere, June precipitation was near the historical mean. Much of June's
rain came from a sequence of powerful storms that buffeted many Minnesota
communities over the period June 11-14. Cumulative precipitation totals
for this period topped four inches in many areas. Tornadoes, severe
thunderstorm winds, and hail accompanied the storms and caused significant
damage. Following this unsettled period, the weather turned dry and
precipitation totals were generally light for the final two weeks of the
WHERE WE STAND NOW
- as of July 2, growing season precipitation totals
(beginning April 1) were more than 125 percent of normal across most of
the state. Growing season precipitation totals exceeded 150 percent of
normal in many Minnesota communities. Precipitation totals were near or
above all-time records for April through June in sections of central, east
central, and northeastern Minnesota. Scattered pockets of record breaking
April through June precipitation totals could also be found in southern
Minnesota. By contrast, April through June precipitation totals for
portions of northwestern Minnesota were near to below historical averages.
- the July precipitation outlook from the Climate
Prediction Center shows no significant tendencies away from climatological
probabilities. July precipitation normals range from three inches in the
far northwest to just over four inches in south central and southeastern
Minnesota. The July temperature outlook also shows no significant
tendencies away from climatological probabilities. Normal July high
temperatures are in the low to mid 80's. Normal July lows are around 60
FROM THE AUTHOR
- during the final week of June, much of the state
experienced five consecutive days of maximum temperatures of 90 degrees or
higher. There was somewhat of a media frenzy about the "heat
wave". It is the responsibility of this Office to help our customers
position weather conditions within the context of history. We gently
reminded callers that maximum temperatures of 90 degrees or greater are
common in southern and western Minnesota. In fact, the Twin Cities
metropolitan area averages 15 days per year where the temperature reaches
the 90 degree mark. However, many of the summers of the past decade were
lacking hot spells of weather. Our climate memories being somewhat short,
assimilated this behavior as the "norm". The moral of the story
... when researching, managing or monitoring natural systems where climate
is a factor, don't trust your memory to define climatic benchmarks. Please
allow us to help you to determine what is typical vs. atypical, probable
vs. improbable; and to place the climate conditions in question in proper
historical and spatial perspective.
- from the University of Minnesota - Southern Research and Outreach Center, Waseca
Rainfall in April-June totaled 16.99 inches or 6.26 inches above normal. This compares to 15.6, 15.8, 11.9 inches, respectively, in 2000, 1999, and 1998. Consequently, soil erosion has been horrendous again this year. Large gullies and deltas of settled, eroded soil can be found throughout the area. Conservation practices including grassed waterways, buffer strips, less tillage, and fewer acres of soybeans on the more erodible soils, will need to be implemented if we are to continue to have some of the most productive soils in the world. Continuing at the present pace will mean that future generations will only be able to read in books about the soil productivity the present generation has enjoyed. Our rich, black, deep and uniform soils will only be a memory of the past, if this rampant erosion is not controlled.
UPCOMING DATES OF NOTE
- July 12, Climate Prediction Center releases 30/90 day temperature and
WEB SITES FEATURED IN THIS EDITION
http://climate.umn.edu - Minnesota Climatology Working Group
- University of Minnesota - Southern Research and Outreach Center, Waseca
Contributions of information and suggestions are welcome!