Sunday, March 27, 2011

Back to the 50s (potential for Thursday night slush)

* March temperatures almost 2 degrees F. cooler than average in the Twin Cities.

* Gradual warming trend likely this week, a string of 40s, the mercury topping 50 as by late week.

* Next chance of a rain/snow mix: late Thursday into Friday morning, potential for a coating to 1" of slush (which should melt within a few hours of falling).

Saturday: probably the nicer, drier day of the weekend with some sunshine, highs in the low 50s.
* More rain possible Sunday.

* Mississippi River forecast to crest Wednesday in St. Paul, a little over 2 feet above major flood state.

Flooding Underway In St. Paul. This is St. Paul's Upper Landing - click here to see an assortment of webcams in St. Paul, courtesy of the city of St. Paul. Harriet Island is now (partially) underwater, along with Warner Road. An initial crest is likely on the Mississippi River within 48-72 hours.

Latest Flood Forecast. Click here to see NOAA's latest prediction for St. Paul - looks like a crest a little over a foot higher than current (rising) levels by Wednesday.

Warming Up? It's Coming.  After muddling through temperatures 10-15 degrees below average in recent days we're due for a thaw, and it's on the way. In fact temperatures consistently stay above 32 F. by Thursday, with a few 50-degree highs possible by the end of the week and weekend. There's still an (outside) shot at 60 over southern Minnesota (where most of the snow has already melted) next weekend.

Thursday Night Slush? Models are predicting nearly a third of an inch (liquid) late Thursday into early Friday, temperatures aloft potentially cold enough for a rain/snow mix. As much as an inch of slush is possible - anything that falls will probably melt on contact. If we do pick up an inch of slush we'll have the dubious distinction of living through the 4th snowiest winter in modern-day records.

Dry Into Thursday Morning. All the models keep us dry most of the week, with a growing chance of (rain) showers late Thursday into Friday (possibly mixed with wet snow) as a warm front sweeps across the Upper Midwest. A more significant storm is possible by Sunday, steadier, heavier rain possible late in the weekend as moisture surges north from the Gulf of Mexico. It's still too early to know how much rain may fall - or whether a surge of colder air will change rain over to a period of wet snow Sunday into Monday.

A Cold Sunday Rain? Disclaimer and meteorological caveat: it's early to be talking about Sunday weather. But yes, I'm living for the weekend, like just about everyone else - so why not take a peek into the not-too-distant future? Saturday looks dry with highs topping 50. There may be enough cold (dry) air in place for a rain/snow mix over parts of central Minnesota - probably (mostly) rain in the Twin Cities. With highs in the upper 30s to low 40s I don't expect any significant accumulation right now. Stay tuned...

What's The Radiation Risk From Flying? I have a few friends and business colleagues who are suddenly paranoid about flying into Tokyo - can't say I blame them. The Smithsonian's Air & Space Magazine has an article that deals with the risk: "Flying involves inherently dangerous elements—complex mechanical equipment, harsh environments, crowded airspace. Air & Space reader Jon Day asks about an additional risk for frequent fliers: radiation exposure. Because Earth's atmosphere shields us from cosmic radiation—the denser the atmosphere, the greater the protection—flying in the upper, thinner portion of the atmosphere increases your radiation exposure. The amount doubles with every 6,000 feet of altitude. Day asks: "For typical altitudes in international flying, how much flying is too much?" Two organizations—the U.S. National Council on Radiation Protection and Measurements and its global equivalent, the International Commission on Radiological Protection—have established the radiation tolerance limits for air crews, the general public, and fetuses. A single, long international flight will expose you to a week's worth of natural background radiation. That's far from a health concern, even for pregnant women. But aviation workers can easily exceed the groups' recommended limits. For example, a pregnant flight attendant working a London-to-Chicago route for just 100 hours (about 12 trips) would exceed the safe exposure for her fetus. For air crews, the limit is 20 millisieverts (mSV) a year. (For scale, a person at ground level gets about 2.4 mSv of natural background radiation a year.)"

Understanding The Dangers Of Radiation. In light of what's happening in Japan I thought it might be timely to find an article (in this case an "infographic") that explains the effects of radiation on the human body. Here is an excerpt from "Recent fluctuating reports that dangerous levels of radiation have been detected in Japanese food and water have many people concerned. The Fukushima explosion is the worst nuclear disaster in Japan since World War II.  This situation comes on the heels of—not one, but two—natural disasters, and the in the midst of this crisis, questions undoubtedly arise about the safety of radiation exposure."

Spoiled By The All-In-One Gadget. The New York Times has an article about our smart phones - why we probably shouldn't take them for granted. Some serious bang for the buck in these little devices: "AT&T’s announcement last Sunday that it plans to acquire T-Mobile was quickly analyzed to be bad news for consumers. If the merger is approved, rates are likely to go up, not just for T-Mobile customers, but for everyone, as there will then be only three companies carving up the majority of the national mobile market. Some consumer advocates and politicians will decry this as Big Mobile enriching itself on the backs of the American consumer. And while that may be true, we will nevertheless continue paying, because the mobile operators well know, and we know too, that for many of us, our smartphones have become invaluable. It is little wonder why: The smartphone contains massive computing power in a hand-held package. It is connected to a global data network that moves words, sounds and images from one end of the earth to another at the speed of light. It is changing the worlds of communication, commerce, politics, entertainment and countless others."

Double "Moonbow". We're all familiar with rainbows - white sunlight refracted (bent) by billions of tiny, prism-like ice crystals into the colors of the rainbow. The same thing is possible with moonlight, although exceptionally rare. This remarkable example (courtesy of was captured by Ethan Tweedie in Hawaii on March 24: "I have been trying to get an image of the illusive Moonbow for a long time. This evening on the way back from the Volcano there it was!! It was cold, windy and raining but I toughed it out. After getting some images the CF card failed and all the pictures were gone. Undaunted I dug into my camera bag and pulled another card! I had just enough time to get two pictures off before it disapeared!!! Here is what I got!!!"

May You Sing Like No One Is Listening. This is one of the funnier video clips I've ever seen (wish I could get my 15 year old spaniel, Max, to attempt this) - thanks to Gloria Gollnitz for posting this (you may need a Facebook account to actually see this). Definitely forward-able.

Stunted Spring. 34 on March 27? That's 12 degrees cooler than average. The mercury only recovered to 27 at Alexandria, after waking up to a nippy 6 (above). 3" of snow on the ground - that should be down to zero by Thursday or Friday.

Paul's Conservation Minnesota Outlook for the Twin Cities and all of Minnesota:

MONDAY: Plenty of sun, still cool. Winds: E 5-10. High: 35

MONDAY NIGHT: Partly cloudy, not quite as chilly. Low: 26

TUESDAY: Clouds increase, turning milder. High: 45

WEDNESDAY: Intervals of sun, snow going fast. Low: 32. High: 49

THURSDAY: Clouds increase, a rain/snow mix is possible by Thursday night, potential for a little slush. Low: 33. High: 51

FRIDAY: Wet, slushy start. Definite hints of spring later, few showers possible. Low: 35. High: 50

SATURDAY: Sunnier, nicer (drier) day. Low: 35. High: 56

SUNDAY: Chance of rain, have a "Plan B" - indoors. Low: 39. High: 52

Greensburg, Kansas F-5. This is a Doppler radar image taken May 4, 2007, showing the 1-2 mile wide tornado that leveled the town of Greensburg. Usually the tornado circulation is too small to actually show up on radar - not this time. Look carefully: the donut-shaped swirl in the lower left of the cell is the actual tornado.

High Tech Marvels

The forecast will never be perfect - but new weather technology, coupled with streamlined warning services, have lowered your risk of winding up as a weather statistic.

In the 1920s an average of 240 people out of every million died from extreme weather events every year: drought, flood, wind, extreme heat or cold. According to the International Disaster Database, that number dropped to just 3 per million last decade. Doppler radar, which allows us to zero in on the spinning thunderstorms most likely to spawn tornadoes - has lowered the tornado lead-time (from when it's spotted to when it arrives) from 6 minutes in the 70's to 12-14 minutes today. Weather satellites track hurricanes from space, leaving plenty of time to evacuate inland. In spite of an apparent uptick in extreme weather (especially floods), safeguards are in place that weren't there for your parents.

A southward shift in the jet stream keeps us dry through Thursday; models hinting at rain Sunday, ending as wet snow next Monday?

40s will feel good, 50s by the end of this week; definite hints of spring by Saturday. A stubborn blocking pattern cools us off next week into mid April.
Dear La Nina: please go away.

Science And Faith Intersect Over Climate Change. The Providence Journal writes about the moral issues surrounding climate change - the impact on health, food and water supplies has been hardest on those with the least, especially across Africa and Asia: "The changes that farmers, fishermen and gardeners are observing can’t be explained by natural warming trends, the report said. “The billions of tons of carbon dioxide, methane and other greenhouse gases we are pumping into the atmosphere explain these trends very well. What’s more, since these gases stay in the atmosphere and trap heat for decades, we are locked into serious disruptions in our way of life.” The impact of climate change is already evident in the Arctic, and the worst impacts are likely to be in Africa, Roberts said. In 2007, he joined Bradley Parks in writing a book titled “A Climate of Injustice: Global Inequality, North-South Politics and Climate Policy.” They studied 4,000 “climate-related disasters” such as hurricanes, floods, droughts and heat waves. They found that in some countries, especially in sub-Saharan Africa, people were 200 times as likely as Americans to die from climate-related disasters, and 300 times more likely to be left homeless."

No comments:

Post a Comment