69 F. average high on September 23.
61 F. high on September 23, 2012.
Sprinkle possible this afternoon - next chance of significant rain: Saturday.
October 4: average date of first 32 F. low in the Twin Cities.
80 F. possible on Friday in the metro area.
Yesterday an article at The PBS Newshour caught my eye, an interview with a professor of plant physiology who has done research into the impact of warmer fall temperatures in recent decades. His theory? Warmer late-season weather tampers with plant photosynthesis, resulting in fewer "anthocyanins", the colors that remain when the green from chlorophyll fades. One of many ways plants & animals are adjusting to a slow-motion climate transformation.
The Minnesota DNR reports 25-50 percent of leaves have ripened over northern Minnesota; peak color in the metro still about 3 weeks away.
This still looks like a good week to stash the lawn chairs into cold storage, maybe take out the water toys and prepare for the inevitable winter to come. No sign of any frost potential in the Twin Cities until the second week of October, at the earliest.
Highs reach the 70s this week, a shot at 80F Friday before a cooler front sparks thunder, maybe even a welcome spell of steadier rain Saturday. Sunday will be the drier, brighter day of the weekend.
Every day of shirtsleeves from now on is a gift. 75-80F is impressive, considering the sun angle today is identical to March 19.
* BWCA file photo above courtesy of Steve Burns.
2013 Hurricane Season Quiet, But Not Over, Experts Warn. Here's a clip from a good article and explainer from NOLA.com in New Orleans: "...The thunderstorms that make up a tropical cyclone are formed when moist air is rising, so the sinking air is believed to be suppressing development. Compounding the suppression factor are strong upper level winds that are shearing off the tops of whatever thunderstorms do form, he said. "This year's Tropical Storms Chantal, Dorian, Erin and Gabrielle each dissipated when they ran into this environment," Feltgen said. "Several tropical waves coming across the tropical Atlantic in recent weeks (in what's referred to as the Cape Verde season because storms tend to form near the Cape Verde islands off the coast of Africa), ran into these environmental issues and failed to develop any further..."
Graphic credit: NOLA.com, The Times-Picayune.
* The Top 10 Most Dangerous Sports? Here's a short list from thetoptens.com.
TODAY: More clouds than sun, dry. Winds: S 10. High: 71
TUESDAY NIGHT: Patchy clouds, dry. Low: 50
WEDNESDAY: More sun, very pleasant. High: 75
THURSDAY: Blue sky, warm PM breeze. Wake-up: 56. High: 79
FRIDAY: Summer breeze with a touch of humidity. Late-day T-storm. Wake-up: 60. High: 81
SATURDAY: Periods of rain, cooler. Wake-up: 61. High: 72
SUNDAY: Partly sunny and drier, comfortable with "average" temperatures for late September. Wake-up: 52. High: 68
MONDAY: Plenty of sun, drama-free. Wake-up: 49. High: 67
Video credit above: Vimeo/Jamie Scott.
Study: Climate Change To Increase U.S. Thunderstorms. In truth, confidence levels about a warmer, wetter atmosphere spawning more severe thunderstorms is not as high as other phenomena (like extreme rainfall amounts). There is still considerable uncertainty. Here's an excerpt from a story at USA Today: "...Deadly and destructive thunderstorms -- and the violent tornadoes they produce -- are forecast to see a "robust" increase across parts of the USA in upcoming decades due to climate change, says a new study published Monday in the Proceedings of the National Academy of Sciences. Springtime severe thunderstorms could increase by as much as 40% over the eastern USA by the end of the century, says lead author Noah Diffenbaugh of Stanford University. The study is one of the first that's found such a link between climate change and severe storms. Most previous research has been inconclusive..."
Image credit above: "