WeatherNation Blog

Unusual December Tornadoes, Next Pacific System

Southeast Tornadoes

National Weather Service Survey Team in Marion CO, MS

A frontal boundary slid across the southeast yesterday afternoon and generated enough instability for a few tornadoes to develop in Louisiana, Mississippi, and Florida.  Most of these were fairly weak but reports of damage have been coming in.  No deaths have been reported and there are only a few minor injuries.  So you might be thinking…tornadoes? This is December! How is this happening? Well its unusual, but it definitely does happen.

The map above from NOAA indicates that from 1991 to 2010 there have been, on average, 24 tornadoes in the month of December. Most of those occur in Texas and the southeast.  Of course, that number pales in comparison to what we usually see during the height of severe weather season, but it is still possible.  Florida has on average 2 tornadoes each December.  Nationwide, the average number of tornadoes continues to decrease in the month of January with an average of only 17.  From there, it continues to grow into February as it jumps back into the 30s.  A more significant increase comes in the month of March with an average into the 70s.

Severe Threat Today

Florida continues to remain under the risk for severe weather today.  The slight risk area includes Melbourne, Miami, Fort Lauderdale, and extends down to Key West. The main threat will be for damaging wind.

The Next Pacific Storm

From Port Townsend, WA

As a calmer weather pattern takes shape over much of the eastern US after a major weekend storm, our attention is now turning back to the pacific northwest.

The map above shows radar imagery from this morning as the first wave of showers began to move in.  Seattle really doesn’t need much more rain, but this soggy weather continues through tomorrow.  Around 43″ of rain has fallen in Seattle since January 1st, so that puts the city about 9″ more than average.

This sytem will slide down the coast and impact nearly the entire coast of California through the end of the week.  Expect rain in the lower elevations and snow in the mountains.

Your Midweek Forecast

Temperatures remain low surrounding the Great Lakes with highs only in the 20s and 30s.  One last day of sunshine is expected in the Bay Area before showers and clouds move in from the north.

Milder air moves into the central plains.  The hot spot is still in South Florida with highs in the 80s.

Happy Tuesday!

Gretchen Mishek

Biggest Snow in 2 Years for Twin Cities (so why is Upper Midwest still in a drought?)

Pro Snow?
So much for our snow drought. Yet 83 percent of Minnesota is still in severe drought, or worse. Sunday’s 8-14″ storm, the equivalent of turning on a snowy faucet, can’t hurt, but early spring rains will determine if we can salvage a promising growing season in 2013. All or nothing.
After last winter’s (pathetic) 22 inches I was exuberant about the weekend snow-blitz. Some took me to task over a “pro-snow” bias, pointing out the risk of traffic accidents & injuries and seniors falling on icy sidewalks. I get it. And I’m certainly not insensitive to the very serious problems that a big dumping of snow can trigger. Winter is a blessing and a curse. But we live in Minnesota. Snow is part of our DNA. It’s a little like growing up in San Diego and complaining about the ocean.
Yes, everyone has an opinion about the weather.
Santa is pleased: no long-lasting thaws are brewing for the next two weeks. In fact this is as cold as it’s going to get for the next 10-15 days; highs mostly 20s and low 30s. We may hit 40F the weekend before Christmas, but most of the snow in your yard will still be there on Dec. 25.
Details below: today the sun starts setting later, due to the changing speed of Earth as it reaches its closest point to the sun. By Dec. 31 the sun sets 10 minutes later than now!
How Much Fell? Yes, it was a lot more than most of us were thinking back on Friday. By midday Saturday models were (finally) shifting the heaviest axis of snow from Montevideo and Willmar into the Twin CIties metro. Not much lead time with this one. The local National Weather Service has a good map showing snow totals here.

* a whopping 13.6″ of snow fell at Twin Cities Headquarters in Chanhassen, Minnesota! 10.5″ fell at MSP Airport.
* for much of central and southern Minnesota it was a “December’s worth” of snow, falling in 24 hours or so.
* 4th largest December snow storm in modern-day Twin Cities weather records.
* keep in mind a total of 22.3″ of snow fell last winter. The most from a single storm? 4.2″ on December 3, 2011.

Temperature Matters. O.K. We picked up a healthy 8-14″ of snow, but temperature was also a big factor after the storm. Keep in mind that temperatures colder than 10-15 F. make it very difficult for chemicals/sand to melt snow. A snow storm at 10 F. is far more dangerous (on the highways) than a storm at 25-30 F, when it’s still possible to melt snow and ice and have (mostly) wet highway surfaces. It’s not just the amount of snow, but the air temperature that determines how nasty the roads will be. Photo: NOAA.

Did Sunday’s Snow Help Our Drought Situation? I posed this question to Minnesota’s State Climatologist, Greg Spoden. Here is his response: “The snow storm will have some impact on drought conditions. Three-quarters of an inch, to one and one-quarter inches of precipitation, falling along a 125-mile-wide swath of Minnesota’s drought-stricken landscape is, of course, very welcome. In many locales, the weekend precipitation totals were roughly the equivalent of December’s normal monthly precipitation total. For quite a few places, 24-hour precipitation totals were the largest for a single day since July.Bad news:

- Falling upon a mostly frozen landscape, only a portion of the weekly precipitation will enter the soil profile. Soil moisture content in many Minnesota counties was 4-6″ short of the end-of-season historical average. This is a lot of ground to make up. Winter precipitation alone can’t rescue us. We remain very dependent on abundant early-spring rainfall.
- The storm provided only a glancing blow to northwest Minnesota and the southern tier of Minnesota counties, two areas of MInnesota in the Extreme Drought category.Good news:

- If we can retain this snow cover through the heart of winter, the insulating effect of the snow will keep frost depths shallow. A shallow frost leaves the ground quicer in the late-winter, thus leaving the soils more receptive to infiltration (from rain) in the early spring.
- I see that the CPC long-range outlooks (6 to 10 day, 8 to 14 day) tilt towards above-normal precipitation. Will our high-albedo landscape set up a baroclinic zone and thus impact the storm tracks? I’ll defer to you synopticians.Greg Spoden, State Climatologist
Minnesota Department of Natural Resources – Division of Ecological and Water Resources

* Climate Prediction Center 8-14 day precipitation outlook above courtesy of Ham Weather. Thanks Greg.

Sun Setting Later? I did a double-take when I got this e-mail from consulting meteorologist Dean DeHarpporte in Eden Prairie, but I suspect he’s onto something here: “We just got our first taste of real winter, and the beginning of astronomical winter (which is meaningful only for those who live their telescopes) is less than 2 weeks away. Yet, we are very close to the first harbinger of spring! What? Yes, on Tuesday, Dec. 11, the sun will start setting later every day until the end of June. The reason for this happy happening is complicated, having to do with the changing speed of the Earth as it gets closest to the sun. Who cares why? Let’s take heart from the news that our dark evenings will soon begin to brighten – and by the end of the month the sun will be setting a full ten minutes later than it is now.”Thanks Dean! I needed that. See for yourself at this web site (plug in Minneapolis and you can get a custom calendar with astronomical information for any month). Sunset today is 4:32 pm. By the end of December sunset is 4:41.

U.S. Snow Cover. As of Monday 31.9% of the Lower 48 States had snow on the ground, up from 20.6% on November 10. There’s some truth to the old adage that “snow breeds more snow”. The reason? Snow cools the air above, keeping temperatures at least 10-15 F. cooler than they would be otherwise, which often tips (future) storms over from a sloppy mix to snow. The process can feed on itself. It remains to be seen if we’ll see a treadmill of significant snow storms (don’t see it yet), but the way our weather has been lately – count on anything. Map above: NOAA.
Warming Trend. Monday was as cold as it’s probably going to get, looking out into the third week of December. Today will still be “chilly”, highs struggling to top 20, but you’ll be amazed how good 32 F. feels on Wednesday. The ECMWF (European) guidance above shows a couple inches of sloppy snow on Saturday – temperatures aloft may be warm enough for a rain/snow mix.
Another Southern Storm? The ECMWF guidance, valid 18z Saturday, shows a storm over Iowa throwing a shield of moisture into Minnesota and Wisconsin. Temperatures aloft may be marginally warm enough for snow to mix with sleet, even rain over southeastern Minnesota – too early to tell. But no, right now I do not see a repeat of last Sunday. Map: WSI.
Slight Warm Bias. NOAA CPC’s experimental NAEFS long-range climate product shows a warm bias across much of the USA and eastern Canada from December 18-24. Will we lose some of our (precious) snow cover? Count on it. But with a little luck we may still salvage a white Christmas. That’s more of a hope than a forecast, by the way.

Positive NAO. The North Atlantic Oscillation, a blocking pattern over North America, is forecast to become positive again during the third week of December, implying a warming trend for much of the USA – the coldest Canadian air bottled up north of the border, at least temporarily. Graph: NOAA.

Unbelievably Poor Choices. “Hey Paul. I saw a young lady driving on 494 in Bloomington Sunday morning. No headlights on, rear window covered in snow AND TEXTING!!! Could you remind people to turn ON their headlights and clear their own personal blizzard from the vehicle BEFORE entering  and driving. It is state law that your vehicle lights must be “on” while there is any kind of precipitation falling. It is because you will become more visible to other motorists. Drive smarter and safer this winter.”
Thank you,
Kent Smith in Eden Prairie

Amen brother. Thanks for sharing this Kent.

Odds Of A White Christmas. Here’s an informative post from NOAA and NCDC, highlighting those lucky towns in the USA where snow on December 25 is pretty much a forgone conclusion: ” Will we have a white Christmas? It’s an age-old question that occurs to almost everyone this time of year. This report, created by the National Climatic Data Center (NCDC), contains maps and tables showing the percent probabilities for a snow depth of at least 1 inch on Christmas morning, as well as the probabilities for a depth of at least 5 inches and 10 inches. The “First Order” Summary of Day Dataset for the period of 1961-1990 was used to compute these statistics. Only stations with at least 25 years of data were used and the ’61-’90 period was chosen to coincide with the standard period for computing climatological normals. Discussion Following is a brief summary of our findings:

Greatest probability for at least 1-inch snow depth (continental U.S.):

100% -
Marquette MI
Sault Ste Marie MI
Hibbing MN
International Falls MN
Stampede Pass WA
Greatest probability for at least 5-inch snow depth (continental U.S.): 100% – Stampede Pass WA.”
December 25. Probability of…          1″          5″      10″
ALEXANDRIA89%41%11%
DULUTH97%63%43%WISCONSIN
HIBBING100%66%41%
INTERNATIONAL FALLS100%73%53%EAU CLAIRE87%33%17%
MINNEAPOLIS73%30%13%GREEN BAY77%40%3%
REDWOOD FALLS62%27%8%LA CROSSE66%28%10%
ST CLOUD73%37%10%MADISON67%20%7%
MILWAUKEE60%10%3%

“Hurricane Sandy Was Not An Extreme Black Swan Hurricane”. Sandy was bad enough, but by no means a worst-case scenario. Here’s an interesting perspective, courtesy of Weather Underground’s chief guru, Dr. Jeff Masters: ”I was in San Francisco last week for the annual Fall Meeting of the American Geophysical Union (AGU), the world’s largest gathering of Earth Scientists. Over twenty thousand scientists from all over the world, including many of the world’s top climate scientists and hurricane scientists, were in town to exchange ideas to advance the cause of Earth Science. One of the more intriguing talks was given by Ning Lin, a professor at Princeton University. She and Dr. Kerry Emanuel of MIT are studying “Black Swans”–tropical cyclones that are a surprise to the observer, and cannot be anticipated based on the 162-year historical record. Very rare extreme hurricanes that one might expect to occur naturally once every 10,000 years are possible, and “climate change has increased the probability of such storms,” Emanuel said at a press conference last week. In terms of storm surge, Sandy was not a black swan, since the 1821 hurricane that hit New York City had a higher storm surge. Historical records recount that the water rose thirteen feet in one hour at The Battery on Manhattan during the 1821 hurricane. The water level did not rise as high as during Sandy, though, since the 1821 hurricane hit at low tide…”

Rebuilding The National Weather Service. Personally, I think we have a terrific national weather service – but it pays to be paranoid. In the spirit of full disclosure I wanted to include this blog post from Cliff Mass. I’m not saying I agree with it, but it’s food for thought. Here’s an excerpt: “As noted in various publications, trillions of dollars of U.S. economic activity are sensitive to weather (Dutton 2002), with nearly a half-trillion dollars of variability in our economy due to weather (Lazo et al., 2011).  Furthermore, the U.S. experiences a wide range of severe weather conditions (tornadoes, hurricanes, severe convection, windstorms, snowstorms) that not only results in economic impacts, but the loss of hundreds to thousands of lives a year from intense weather. The U.S. should have the best weather prediction capability in the world.  We have the world’s most extensive weather research community and many key weather prediction breakthroughs have occurred here, including the first numerical weather prediction.  We also spend more money on weather prediction than anyone else and our private sector meteorological community is large and vigorous. But the sad truth is that we are lagging behind the world leaders, and are even farther behind our inherent capabilities.  The loss to the nation, both in lives and economic value, is immense and unnecessary.   It is time to face up to the problems and fix them….”

Image credit above: “Comparison between the U.S. (GFS, black), European Center (red lines), and other modeling systems over the northern hemisphere.  The closer to one the better.  The ECMWF model (red) beats the U.S. model (black) for nearly all days.  The difference is even larger in the southern hemisphere.”

Evidence Noah’s Biblical Flood Happened, Says Robert Ballard. Here’s a clip from a fascinating article at ABC News: ”…The questions is, was there a mother of all floods,” Ballard said. According to a controversial theory proposed by two Columbia University scientists, there really was one in the Black Sea region. They believe that the now-salty Black Sea was once an isolated freshwater lake surrounded by farmland, until it was flooded by an enormous wall of water from the rising Mediterranean Sea. The force of the water was two hundred times that of Niagara Falls, sweeping away everything in its path. Fascinated by the idea, Ballard and his team decided to investigate. “We went in there to look for the flood,” he said. “Not just a slow moving, advancing rise of sea level, but a really big flood that then stayed… The land that went under stayed under.….”

Photo credit above: “This ark, located an hour south of Amsterdam, is a replica of Noah’s Biblical boat. Underwater archaeologist Robert Ballard is in Turkey, looking for evidence that the Great Flood happened.” (ABC News)

“Snowbull” Sled Takes Skiing Lying Down. I like the lying down part. If I could put skis on my sofa I’d give that a try too. If you’re looking for a unique new snow-gadget check out this article from gizmag.com; here’s an excerpt: “Traditionally the domain of small children celebrating a snow day, sledding is slowly working its way up to a serious snow sport akin to skiing. About a month ago, we covered the US$3,000 Snolo Stealth-X carbon fiber sled, and now we have another high-tech sled built for serious downhillers. The Snowbull is an Austrian-designed sled that uses high-tech components for a sharp, fast ride….”

Top 10 Ways To Avoid Being Tracked Online. I get a lot of useful nuggets of information listening to “Marketplace“; here’s an excerpt of a story you might want to graze before plugging your Visa number into some nameless, faceless online account:

1. Read the agreements for all mobile phone apps before you download them.  Some of them are scary!  They will track your location using your GPS and some (like Facebook) will download ALL OF THE CONTACTS IN YOUR PHONE. Can’t remember who you’ve handed your data to?  MyPermissions can help.  

2. Read the Terms of Service Agreements for sites you give your information to. Especially sites you give your financial information to. You maybe thinking:”I’ve been on page 5 of Freedom for 8 months, HOW am I going to find the time to read online agreements?”  ToS;DR can help.…”

“One Poodle Deep.” How deep was the snow? About a 1-poodle storm. Who writes this stuff?

What’s 111 Degrees Among Friends? Talk about extremes. Check this out, courtesy of NOAA and Chad Merrill at Earth Networks:

High Temperature for Monday, December 10, 2012
87 at Fort Pierce, FL
87 at Punta Gorda, FL
Low Temperature for Monday, December 10, 2012
-24 at Alamosa, CO
The Very Definition Of “Duh”. I have no further information on this one…
Climate Stories…

Climate Models Project Increase In U.S. Wildfire RiskNASA has the details; here’s a clip: “Scientists using NASA satellite data and climate models have projected drier conditions likely will cause increased fire activity across the United States in coming decades. Other findings about U.S. wildfires, including their amount of carbon emissions and how the length and strength of fire seasons are expected to change under future climate conditions, were also presented Tuesday at the annual meeting of the American Geophysical Union in San Francisco…”Photo credit above: “The Whitewater-Baldy Complex wildfire in Gila National Forest, New Mexico, as it burned on June 6th, 2012. Scientists calculate that high fire years like 2012 are likely occur two to four times per decade by mid-century, instead of once per decade under current climate conditions.” Credit: Kari Greer/USFS Gila National Forest

So You Think Man-Made Global Warming Is A Hoax, Eh? Here’s a clip from a blog post at The Rockford Register Star: “The graphic above is intended for the edification of those commenters here at Applesauce who think there is lots of skepticism among climate scientists about anthropogenic global warming. Take, for example, the guy who referred just the other day to “the mountains of evidence on the opposite side of the argument.” My response was this: “The truth is that more than 95 percent of scientists working in the disciplines contributing to studies of our climate accept that climate change is almost certainly being caused by human activities. “Moreover, there are no national or major scientific institutions anywhere in the world that dispute the theory of anthropogenic climate change. Not one.”Graphic credit above: “From the Web of Science peer-reviewed scientific articles with keyword phrases “global warming” or “global climate change” published between 1991 and 2012.” Research by JL Powell. Full article at DeSmogBlog (http://s.tt/1tBXZ)


Global Warming Said To Cost Ski Resorts $1 BillionTheday.com has the story; here’s an excerpt: ”Declines in snowfall because of global warming are shortening the winter ski season in the United States and harming the economy, according to a report from two environmental groups. In poor snow seasons such as last winter, visits drop to ski areas in states such as Colorado and New York, costing ski resorts $1 billion in revenue over the past decade, the Natural Resources Defense Council and Protect Our Winters said in the report released Thursday. The winter sports industry contributes more than $12 billion a year to the U.S. economy, the study said. “Climate change spells trouble for all businesses dependent on winter weather, from snowmobiling, snowboarding, and ice fishing to snowshoeing and skiing,” the groups said in the report…”Photo credit above: Robert F. Bukaty AP Photo. “Four Santas ride a chairlift last Sunday at the Sunday River Ski Resort in Newry, Maine. More than 250 skiers and snowboarders participated in the annual Santa Sunday event to raise money to benefit the Bethel Rotary Club’s Christmas for Children program. A number of ski areas are open now in New England, but environmental groups warn that more ski areas throughout the Northeast and the rest of the country will have to make their own snow and face shortened seasons because of rising global temperatures.”

Yikes! Government Details 6 Most Terrifying Arctic Trends. The story (and graphics) from Mother Jones; here’s an excerpt: ”The National Oceanic and Atmospheric Administration (NOAA) published its seventh-annual Arctic Report Card this week, and though they didn’t hand out a grade as they have in the past, it might as well be marked “G” for grim. Here are six of the biggest problems up north…”

Natural Gas’ Role In Combating Climate Change. Here’s an excerpt of a post from David Frum at The Daily Beast: “The chart above shows the Department of Energy’s estimates of CO2 emissions per capita from 1973 to 2040. Total energy-related carbon emissions are expected to fall to a 20-year low this year, and on a per-capita basis will be the lowest since at least 1973 when the Department of Energy’s data begins. From the current level of 17 tons per capita, we can expect CO2 emissions per capita to fall to 14 tons per capita in 2040, a 25.2% decrease…”

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Welcome to the WeatherNation blog. Every day I sift through hundreds of stories, maps, graphics and meteorological web sites, trying to capture some of the most interesting weather nuggets, the stories behind the forecast. I’ll link to stories and share some of the web sites I use. I’m still passionate about the weather, have been ever since Tropical Storm Agnes flooded my home in Lancaster, PA in 1972. I’ve started 5 weather-related companies. “EarthWatch” created the world’s first 3-D weather graphics for TV stations – Steven Spielberg used our software in “Jurassic Park” and “Twister”. My last company, “Digital Cyclone”, personalized weather for cell phones. “My-Cast” was launched in 2001 and is still going strong on iPhone, Android and Blackberry. I sold DCI to Garmin in 2007 so I could focus on my latest venture: WeatherNation. I also write a daily weather column for The Star Tribune startribune.com/weather And if you’re on Twitter, you’ll find me @pdouglasweather

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