Sunday, May 24, 2009

Amazingly nice for a holiday!


No rainfall is predicted through most of Memorial Day for the Twin Cities area, with jives with the other computer models I'm looking at. It should be a beautiful day on your favorite lake, or just loitering in the yard, not too much to complain about. I still can't believe this lucky spell of fine weather is coming on a holiday. We've seen some absolutely atrocious Memorial Days, weatherwise, but this will NOT be one of them.

Moisture streams north tomorrow, but it still looks like any showers and T-storms will remain over far western and northern Minnesota; parts of the Red River Valley could wind up getting soaked with over 1" of rain, but it's beginning to look like dry weather will prevail over much of central and southern Minnesota until sometime Tuesday, when a slow-moving cool front will finally pick up steam and cross the state. That's right: 3 dry days in a row, on a holiday weekend. Unprecedented, bordering on atmospherically impossible, right? That's what I thought. I don't want to get cocky or overconfident; it's still a little early for celebration, but I'm cautiously optimistic that you can (confidently) make outdoor plans for Memorial Day, with little fear of having to abandon your fishing boat, barbecue or afternoon on the beach. West of Detroit Lakes and Bemidji it's a different story: you may have a close encounter of the wet (noisy) kind, but any storms will probably bypass the Brainerd Lakes area to the north and west.

Weather Headlines

* Today: bright sun, light winds, low humidity. Winds blow predominately from the east at 8-13 mph.

* Parts of far northern Minnesota waking up to a light frost this morning. Under the center of high pressure, with crystal-clear skies and virtually no wind: conditions ripe for unusually chilly weather.

* Memorial Day: not quite as sunny, a bit more humid. Winds blow from the southeast, a bit stronger, averaging between 10-20 mph.

* There is a 1 in 5 chance of T-storms drifting into the Twin Cities by afternoon or evening, but MOST of the storms should remain over far northern and western Minnesota.

* Much better chance of showers and T-storms Tuesday as cool front finally arrives.

* 80 possible by next Saturday. It's still early, but models hinting at a better chance of a little rain next Sunday.

(This is the WRF/NAM 48 hour forecast, valid around the dinner hour tomorrow. Models are pretty consistent in keeping most of the moisture, the showers and T-storms, north and west of the Twin Cities. There's a much better chance of late-day rain in Moorhead, Thief River Falls, even Bemidji than in the immediate metro area, although it's a little close for comfort. The Brainerd Lakes area will be on the edge of the expected rainfall, a little too close to call. Either way, outdoor plans scheduled during the morning and midday hours should be dry, the best chance of rain over western and northern counties of Minnesota coming after 3-4 pm).


O.K. What are you trying to do to me Paul? What on earth is this chart/map/meteorological oddity? This is a "meteogram" for the Twin Cities, showing predicted weather for our local area for the day Sunday. Click on the graphic so you can see it full screen, with far more detail. You'll see that the (GFS) computer model is predicting a high of 72 around 4 pm, winds swing around to the east after breakfast, with peak sustained winds around 9 mph. Total sky cover (equivalent to cloudcover) increases around the dinner hour, as the tops of T-storms over the Dakotas are swept eastward over Minnesota. That said, most of today should be sunny and nearly perfect for whatever you have planned.



Part of the challenge of forecasting the weather is communicating what I think the sky will look like - accurately - to you, the reader, the consumer of weather. We try to choose our words carefully, but there's often confusion. What does "partly cloudy" really mean, anyway? So I'm going to try something a little different today, using photos to help describe what I HOPE the sky will look like today and Memorial Day. The Internet is all about experimentation, right? So here goes...

(Remember, the risk of sunburn has nothing to do with temperature, and everything to do with the date and sun angle. The sun is about as high in the sky, and powerful, as it ever gets. Without sunscreen you can become the proud recipient of a painful sunburn within 30 minutes. All it takes is a few blistering sunburns to increase your risk of contracting melanoma, a sometimes fatal form of skin cancer. Treat the sun with the respect it deserves).



(Sunday's sky should feature more cirrus clouds, composed of ice crystals suspended about 25,000 feet above the ground. You may notice more jet contrails, which often spread out into a high, cellophane-thin layer of clouds capable of dimming the sun or moon).

Sunday Weather: still nice with ample sun. A chilly start gives way to sunshine and temperatures a few degrees milder than yesterday, afternoon readings in the low to mid 70s (central and south) to the mid 60s (far north). Winds will be light, and Doppler should be free of any showers - it looks like a pretty nice spring day across the great state of Minnesota....few complaints.

Winds: East 6-13, visibility over 20 miles, steady, then falling barometer.

(On Memorial Day this may be the view outside your cabin if you're up in the Detroit Lakes or even the Bemidji area. The risk of T-storms will be greatest over far western and northern counties of Minnesota, but even there it probably won't be an all-day rain. Have a Plan B, indoors, just in case the sky opens up. If it's any consolation the risk of severe weather looks minimal. But any T-storm, by definition, is potentially deadly. Lightning is lazy: it wants the easiest path from the cloud base to the ground. If you're stuck on a boat, or lounging on the beach, YOU may be the tallest object in the area. Being a human lightning rod is no fun - the first clap of thunder, the first flash of lightning on the horizon, make a bee-line for the relative safety of your cabin).

Memorial Day Weather: clouds slowly increase with a growing chance of showers and storms, especially west of Windom, Fergus Falls, and Thief River Falls by afternoon. The heaviest rain, 2-5 hours worth, should be over far western and northern Minnesota, where some .5"+ rainfall amounts are quite possible. You'll notice higher humidity levels (it may border on sticky), more haze, but a fair amount of sun from St. Cloud south and east toward the Twin Cities, Rochester and Mankato. The farther north/west you go, the better the odds of some rain, especially PM hours.

Winds: Southeast 10-20, gustier. Visibility: under 10 miles in haze, high clouds, falling barometer. Lightning risk should be greatest over far northern/western lakes - be ready to get off the lake in a hurry the first time you see lightning or hear a rumble of thunder.

Long-range guidance is hinting at a few hours of rain next Sunday (May 31) with Saturday possibly being the sunnier day of the weekend. That's way off on the horizon, barely legible on the maps, to be sure. I'm more concerned (freaked out, really) about the short-term forecast. Have fun out there, enjoy one of the nicest Memorial Day Weekends we've enjoyed in recent years. On Monday I hope you'll join me in taking a few minutes to say a silent prayer to the men and women we honor; those who have sacrificed everything so we can enjoy a weekend getaway with our families, in freedom. As I get older I take less and less for granted, not the least of which is the cost of protecting our nation, our way of life. As crazy as that life can be some days I still wouldn't trade it for anything. What's that old saying? "Democracy isn't perfect, but it sure beats all the other alternatives...."

Happy Memorial Day!

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