There are two days left in the second month of meteorological summer. The above-normal temperature trend will continue.
But the normal temperatures are already declining. The 30-year average high temperature for July 30 in the Twin Cities is 83 degrees. For July 7 to July 22 the average maximum temperature at the International Airport in the Twin Cities is 84 degrees. By no means are we in rapid descent.
Saturday night and Sunday morning's rain tallied about a third of an inch to two-thirds of an inch in east central Minnesota. But once again, the far southwest corner of the state missed out on the moisture. So far this month of July, Sioux Falls, S.D. has recorded a mere quarter inch of rain and less than an inch (0.98) of rain since June 1.
Perhaps the farmlands can look forward to some badly needed rain this week, but not before things heat up again today into Wednesday. The forecast from NOAA/NCEP paints a potential of more than an inch of rain in far southwest Minnesota and northeast South Dakota Wednesday night through Friday.
High temperatures this afternoon will approach 90 degrees in southern Minnesota and western Minnesota. Yesterday's temperatures were a bit topsy-turvy. Roseau in far northwest Minnesota recorded a high of 91 with only 73 degrees in Preston, due to a rather persistent cloud layer. The Twin Cities reached 80 degrees. June 25th was the last day the thermometer failed to climb to 80 (77 degrees) or better at MSP.
By the time we reach the weekend temperatures will be closer to normal. Highs in the 70s to lower 80s will still feel quite nice. NOAA's temperature outlook for August continues the trend of above normal temperatures in a large region of the continental U.S.
On Friday there was a nice example of differential heating displayed on the visible satellite image. This NOAA visible satellite picture from mid afternoon nicely depicts the heated land surface inducing cumulus cloud formation. You can clearly note the more stable air over the larger bodies of water that essentially remain cloud free.
Wondering about the dew points? Expect them to remain mainly in the 60s today and Tuesday and then climbing into the 70s for a very warm and humid Wednesday.
Posted at 4:44 PM on July 30, 2012
by Bill Endersen
You might not have noticed it, but a weak cold front slipped southeastward across Minnesota today.
Even though the weather remained quite toasty, the front's passage was marked by a wind shift from southwesterly to northwesterly. A few hours later the dew point began to edge downward, so that was welcome.
The really brutal heat and drought have been building to the south for more than a month. Since June 27, Kansas City has had 17 100-degree days, and just 0.6 inches of rain.
In the midst of the worst heat, Tulsa, Okla., has reached 100 degrees in 13 of the last 14 days -- the low day was a near-miss 99 degrees. Tulsans roasted under highs of 108 both Saturday and Sunday. Today has been worse -- their morning low was 88. That running start allowed the high to hit at least 109. Every day this month has been at least 95 degrees and there will be no relief for the at least the next week.
At least one of the forecasting models points to the likelihood of rain sagging farther south into some rain-starved portions of the Central Plains and Midwest next week.
Closer to home, a few isolated showers or thunderstorms are possible in the Arrowhead this evening. The main activity has shifted east across Wisconsin where the cold front is triggering thunderstorms. A severe thunderstorm watch is in effect for northeastern Wisconsin, including Green Bay and Door County, and much of Michigan's Upper Peninsula.
Around Minnesota, Tuesday will be a sunny and slightly cooler day beneath high pressure. High temperatures will be mainly in the 80s.
Chances of showers and thunderstorms will return on Wednesday and then again Friday and Saturday.
Early-rising newspaper deliverers can enjoy a lovely waxing, gibbous moon that will set in the western sky before sunrise Tuesday.
We usually do our cloud-watching from ground level. The photo below shows the topsides of towering cumulus clouds over southern Ontario last week. It was taken through the window of a passenger jet during the evening when the sun was getting low in the sky to the right. A few other unstable clouds in the area had grown into thunderstorms but these guys probably came up short.
Bill Endersen(1 Comments)