Saturday: Partly cloudy. H: 79° Wind: SE 7-9
Saturday Night: Clear. L: 61°
Sunday:Sunny. H: 80° L: 50° Wind: S 5-10
Monday: Late PM light rain. H: 68° L: 50° Wind: SW 4
Tuesday: Partly sunny. H: 65° L: 52° Wind: E 7
Wednesday: Cloudy, rain begins by mid-afternoon. H: 71° L: 58° Wind: SE 10
Chemistry of Colors: The science behind all the gorgeous fall colors: http://bit.ly/1wkPXaD
Rain Wanted: One would think that any rain would be bad for off-road cycling, think again. The Red Bull Rampage race is soon and trail builders actually prefer damp dirt. Get the scoop (pun intended) from the video below:
Butterfly Radar: Something odd showed up on the St. Louis radar recently. Blobs of reflectivity took on an odd shape, unlike any rain or snow. What was captured by radar that day was actually a migration of Monarch butterflies! This is a phenomenon that is often observed by meteorologists. Sometimes the radar picks up on bats, insects and wind turbines.
Wednesday: Cloudy, rain showers. H: 74 Wind: SE 10
Wednesday Night: Clearing. L: 56
Thursday: Dry. H: 77 L: 58 Wind: SE 4
Friday: Sunny. H: 80 L: 59 Wind: SE 7
Saturday: Warmest day of the week. H: 81 L: 60 Wind:SW 10
Sunday: Partly cloudy. H: 77 L: 57 Wind: SW 4
The astronomical start to fall occurs this Monday, the Autumnal Equinox!
Rain Friday night & again on Saturday evening will likely to leave many trails damp over the weekend. Dry northwesterly flow takes over Sunday with optimal evaporation and drier trails into early next week.
Saturday: Early morning rain. Gradual PM clearing. H: 74 W 10
Saturday Night: Early evening shower. L: 63
Sunday: Partly cloudy. Cooler. H: 68 L: 52 Wind: NW 10
Monday: Sunny. H: 73 L: 54 Wind: WSW 4
Tuesday: Dry. H: 75 L: 57 Wind: S 2-4
Wednesday: Showers and thunderstorms. H: 72 L: 59 Wind: SE 10
Hello Ozone: The ozone hole is slowly recovering, if not growing back. Latest study: http://bit.ly/1u3iLDF
Lunchbox in Space: What's a lunchbox doing high above the Earth? Students from the Earth to Sky Calculus wanted to measure radiation as a CME whizzed passed.
"On Sept. 12th, a CME hit Earth's magnetic field, igniting the most intense geomagnetic storm of the year. The students of Earth to Sky Calculus quickly launched a helium balloon to the stratosphere to see what effect the storm was having on Earth's upper atmosphere. They expected to measure more radiation than usual. Instead, they measured less."
The lower measurement occurred when the CME swept past Earth, it swept aside many of the cosmic rays that normally surround Earth. Read more at: spaceweather.com
A dry period remains through Thursday. Next best chance of rain is late Friday with a quick-moving cold front. The fast nature of this boundary will limit rainfall amounts to under 1 inch. Expect cooler weather by the end of the weekend.
Tuesday: Sunny. H: 67 Wind: WSW 4
Tuesday Night: Clear. L: 50
Wednesday: Dry. H: 71 L: 53 Wind: SSW 4
Thursday: Sunny. H: 71 L: 58 Wind: SE 4
Friday: Turning cloudy, rain late. H: 79 L: 65 Wind: SE 10
Saturday: Morning showers, remaining mostly cloudy. H: 76 L: 54 Wind: SW 10
Sunday: Becoming mostly cloudy. H: 73 L: 50 Wind: WNW 4
Fall Trends: Areas west of the Mississippi have had an unmistakable warming trend during the fall season. The Upper Midwest has seen a 0.88 degree increase in warmth per decade.
Precipitation trends have also changed. Fall is leaning towards slightly drier than average conditions across the Midwest. As Climate Central points out, "this warming could lead to a range of impacts nationwide, such as pushing back the fall harvest, delaying the frost/freeze season (which plays into the life cycles of species and ecosystems), extending the wildfire season, and affecting fall foliage displays."
Cirrocumulus Virga: I snapped this picture (below) driving back from Lebanon Hills last Saturday....wispy clouds descending from a tiny parent cloud. The feathery look to the clouds might actually be ice crystals falling from the cloud but evaporating before reaching the ground. These clouds are often referred to as "mares' tails" as they resemble the tails of horses.
Measuring Carbon Footprint:
"Scientists have developed a new approach to estimate carbon dioxide emissions from burning fossil fuels -- one that provides crucial information to policymakers. Called the 'Fossil Fuel Data Assimilation System,' this system was used to quantify 15 years of carbon dioxide emissions, every hour, for the entire planet -- down to the city scale. Until now, scientists have estimated greenhouse gas emissions at coarser scales or used less reliable techniques." Read more about this study here.
Air that has been sitting over the arctic for months will now make it's seasonal descent into Minnesota. Lows in the 30s Friday night will be a sign that our long, muggy summer nights are now behind us. Time to dig out the merino wool from the back of the closet!
Wednesday: Heavy rain early. 1-2 inch rainfall per hour could increase runoff on the trails. H: 55° Wind: NW 10-15
Wednesday Night: Brisk NW wind, high evaporation rates. L: 41°
Thursday: An October-looking sky. H: 56° L: 40° Wind: NW 5-10
Friday: Turning clear. Cold night. H: 56° L: 39° Wind: NW 4
Saturday: Sunny. H: 61° L: 44° Wind: SW 4
Sunday: Clear. H: 62° L: 46° Wind: S 5-10
Early fall is known for bomber low pressure storms (as shown above) that develop over the plains. Storms like this can easily drop the air temp a good 30-40 degrees within 24 hours. The first frost is likely in some Minnesota communities come Saturday morning.
Stellar weekend for riding singletrack in central Minnesota! Next bit of rain comes Monday night. Otherwise expect a dry relatively dry week ahead.
Saturday: Sunny. H: 74 Wind: W 4
Saturday Night: Clear, cool. L: 56
Sunday: Sunny. H: 75 L: 55 Wind: SW 7
Monday: Partly cloudy, isolated thunder late. H: 75 L: 61 Wind: S 10-15
Tuesday: Warmest day of the week. H: 78 L: 60 Wind: W 4
Wednesday: Cloudy, rain increasing. H: 63 L: 49 Wind: NE 10
Models have been consistent in showing a significant cool-down next weekend. A big blob of air (polar in origin) dives south into Minnesota by the 13-14 of September. The air about 1 mile up in the atmosphere will be hovering close to -5 degrees Celsius (23°F). This cold air aloft is translated to temps nearing freezing at the surface. Time to dig out the merino wool!
High humidity is back, but only for a short time. After some severe storms late Wednesday, a much cooler/drier atmosphere settles in that should make for a pleasant riding weekend.
Wednesday: PM/evening strong storm. H: 83 Wind: S 10-15
Wednesday Night: Thunderstorms. L: 73
Thursday: Morning rain, then clearing. H: 82 L: 52 Wind: WNW 10-15
Friday: Sunny. H: 69 L: 49 Wind: WSW 7
Saturday: Sunny. H: 73 L: 54 Wind: W 2
Sunday: Dry. H: 75 L: 58 Wind: SW 7
Meteorological summer (June, July, August) is officially over. Fall is right around the corner with the astonomical start to the Autumn season just 3 weeks away. Models keep hinting at a real fall feel (lows in the 30s) come mid September. Get ready...
NWS Twin Cities Weather Story