Dr. Jeff Masters' WunderBlog

Forecast for the winter of 2005-2006:: Part I, the woolly bears
Posted by: Dr. Jeff Masters, 13:52 GMT le 08 novembre 2005 +0
And now for something completely different: the woolly bear caterpillar forecast for the coming winter. After months of focusing on the death and destruction wrought by the fury of nature's hurricanes, and now tornadoes, it's time to take a break. The tropics remain quiet again today, allowing us to indulge. The political discussions can wait until another day.

According to legend, the severity of the upcoming winter can be judged by examining the pattern of brown and black stripes on woolly bear caterpillars--the larvae of Isabella tiger moths. If the brown stripe between the two black stripes is thick, the winter will be a mild one. A narrow brown stripe portends a long, cold winter.

The Hagerstown, Maryland Town and Country Almanack has been publishing weather forecasts and weather lore for 209 years. The Almanack sponsors an annual woolly bear caterpillar event, where local school children in Hagerstown collect woolly bears. A panel of judges examines the collected specimens and issues a woolly bear forecast for the upcoming winter. Gerald W. Spessard, the Town and Country Almanack's business manager and one of this year's two judges, observed that the middle brown stripes on the 20 caterpillars collected this year were thicker than usual. "There's not a whole lot of black at either end, so we both agree this should be a fairly mild winter," Spessard said, according to an AP press release.

Naturally, this forecast only applies to the Hagerstown, Maryland area, so other locales will need to do their own woolly bear work to gauge the local winter forecast. The Hagerstown critters have had mixed success the past three years with their forecasts--they've been correct about half the time. This is only slightly worse than the official NOAA long range forecasts.

Several scientific studies have been done on woolly bear caterpillar forecasts, including one by the American Museum of Natural History. None of these studies have shown any correlation between woolly bear markings and the severity of the upcoming winter. According to Ned Rozell, science writer at the University of Alaska's Geophysical Institute, Biologist Dr. Charles Curran began studying woolly bear markings and the severity of winters in 1948. For the first three years, the caterpillars had wide brown bands, correctly forecasting three consecutive mild winters. The caterpillars failed the next year, and Dr. Curran gave up the study in 1955 after finding two groups of caterpillars living near each other that had vastly different predictions for the upcoming winter.

So, you're probably better off using the official NOAA long-range forecast for the upcoming winter--although not by much. I'll discuss the official NOAA forecast for the upcoming winter tomorrow, and talk about how well they've done in past years.

Jeff Masters
wooly bear catepiller (Olbetsy)
These are all over in the fall
wooly bear catepiller
Categories: Winter Weather
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51. StellarCyclone 19:44 GMT le 08 novembre 2005    
I love wandering's weather rock.

Like others I also think oil would be a bad idea in terms of ecology and other issues to deal with hurricanes.

And I think mouseybabe's spiral is a good way to describe the current weather situation with cycles and global warming.
52. rwdobson 19:49 GMT le 08 novembre 2005    
Hmm, thought I had already posted this but it's not showing up...but GOOD NEWS. color pinter is on the fritz so now I "have" to leave the office and go to kinko's. woo hoo!
Member Since: 12 juin 2002 Posts: 0 Comments: 1574
53. weatherdude65 20:03 GMT le 08 novembre 2005    
stormy, the outdoor part was free :-) lol

It is a very beautiful day today, took a drive down river road.
54. Pensacola21 20:04 GMT le 08 novembre 2005    
RW - I know the "have" to leave feeling (bank, etc.)... It's great when that happens! :-)
Member Since: 16 septembre 2005 Posts: 30 Comments: 3912
55. weatherdude65 20:05 GMT le 08 novembre 2005    
shhhhhhh, be vewy, vewy quiet, I'm hunting caterpillars LOL
56. Pensacola21 20:05 GMT le 08 novembre 2005    
LOL..
Member Since: 16 septembre 2005 Posts: 30 Comments: 3912
57. Pensacola21 20:07 GMT le 08 novembre 2005    
I am SO bored.... I get a rush of papers flying at me and then after that NOTHING....
Member Since: 16 septembre 2005 Posts: 30 Comments: 3912
58. weatherdude65 20:08 GMT le 08 novembre 2005    
21, you can have all of my papers if you'd like
59. stormydee 20:27 GMT le 08 novembre 2005    
ya 21, but be quiet as we give them to you so 65 can get that cat-a-pill-r :-)
Member Since: 25 août 2005 Posts: 39 Comments: 517
60. weatherdude65 20:28 GMT le 08 novembre 2005    
shhhhhhh....I have him cornered now lol
61. stormydee 20:30 GMT le 08 novembre 2005    
when I was a little girl, I use to catch caterpillars all the time...Id put them in a glass jar with everything I thought they would need....they'd make a cocoon...and...that was it! I never saw it hatch, but this horrible smell would come from the jar...I guess I was missing some important ingredient they needed while cocooning....
So recently, I reflected on that as I helped my mother free a butterfly from her back porch...you can't touch them so I was trying so hard to scoop him through a screen opening with a broom handle, no less....didn't want the bristles to touch it either...luckily, I freed him and saved the day!
Member Since: 25 août 2005 Posts: 39 Comments: 517
62. weatherdude65 20:35 GMT le 08 novembre 2005    
Last year as we were getting ready to head to Tampa away from Jeanne, my daughter comes home from school with the class cocoon. We thought, great, now watch this thing die while we are in Tampa. We were getting ready to head home after the hurricane and looked at the cocoon and it was black. We thought we had killed it. We stopped at McDonalds for breakfast and when we came out there was a beautiful butterfly in the container. We then had to keep that alive until my daughter could take it back to school.
63. stormydee 20:42 GMT le 08 novembre 2005    
well 65, you have better luck than I do with them...so catch him carefully and take pics when he is a butterfly :-)
Member Since: 25 août 2005 Posts: 39 Comments: 517
64. stormydee 20:45 GMT le 08 novembre 2005    
well, wrapping up to go home.
Have a great night everyone!
:-)
Member Since: 25 août 2005 Posts: 39 Comments: 517
65. weatherdude65 20:56 GMT le 08 novembre 2005    
goodnite stormy! Have a wonderful evening :-)
66. Pensacola21 20:57 GMT le 08 novembre 2005    
Bye Stormy...

That's neat Weatherdude... I bet your daughter loved it!
Member Since: 16 septembre 2005 Posts: 30 Comments: 3912
67. weatherdude65 20:58 GMT le 08 novembre 2005    
21, she thought that it was great. To have it change on her watch, she was very excited.
68. Pensacola21 20:59 GMT le 08 novembre 2005    
Awww I bet... How old is she?
Member Since: 16 septembre 2005 Posts: 30 Comments: 3912
69. DarthCainus 21:00 GMT le 08 novembre 2005    
Vermillion OH had an annual Woolly Bear Festival. Dick Goddard was always promoting it. I remember from my time IL that the folks there called them woolly worms. It was always fun to find them as a kid and "predict" the winter. Of course, we hoped for as little brown as possible in hopes of a lot of snow days. No such fun for my kids down here in FL. Ok, they do get hurricane days, but snow is more fun to play in on those days off...
70. FloridaBorn 21:00 GMT le 08 novembre 2005    
I love it! All the fancy, expensive, scientific equipment in the world isn't much better at forecasting winter than a lowly caterpillar
Member Since: 8 juin 2002 Posts: 3 Comments: 11
71. Pensacola21 21:01 GMT le 08 novembre 2005    
LOL, Darth.. You got that right!!
Member Since: 16 septembre 2005 Posts: 30 Comments: 3912
72. weatherdude65 21:01 GMT le 08 novembre 2005    
she's 8....she has a brother who is 13
73. weatherdude65 21:02 GMT le 08 novembre 2005    
Darth, when I lived in Maine, the only time we got snow days was when it was so bad that the busses could not drive for the visibility
74. Pensacola21 21:02 GMT le 08 novembre 2005    
I guess I better get back to work...

Bye Weatherdude and everyone else... See ya tomorrow =)
Member Since: 16 septembre 2005 Posts: 30 Comments: 3912
75. weatherdude65 21:03 GMT le 08 novembre 2005    
catch you later 21, have a good night
76. Pensacola21 21:05 GMT le 08 novembre 2005    
Awww, she's still a baby!! My mom had four of us, me: 21, my lil sis:10 and my lil brothers are 12 & 19... BIG age differences...

Anyway see ya'll later!!
Member Since: 16 septembre 2005 Posts: 30 Comments: 3912
77. oriondarkwood 21:56 GMT le 08 novembre 2005    
I been away for a few days, darn reality sucking all my time. Hopefully I can post some more weather photos in a couple of days. And maybe it will finally get cold up in my neck of the woods. Sunday was 72 up here, its usually 20 degrees colder by this time of year.

Today was average (felt warmer), tommorrow suppose to be 60 before the bottom drops out tommorrow night. Thrusday suppose to be NASTY, high winds, slushy (ie sleet,snow,rain) dropping temps..
Member Since: 5 juillet 2004 Posts: 51 Comments: 41
78. hurricanewayne 23:08 GMT le 08 novembre 2005    
I THINK
79. taco2me61 01:13 GMT le 09 novembre 2005    
HI all just reading LOL
Member Since: 7 juillet 2005 Posts: 6 Comments: 2788
80. palmettobug53 01:25 GMT le 09 novembre 2005    
Man, I gotta get me one of those Weather Rocks! I'll be the envy of all my friends, with my accurate forecasting!
LOL
Member Since: 7 octobre 2005 Posts: 207 Comments: 21675
81. code1 01:59 GMT le 09 novembre 2005    
Thanks for the blast from the past pic Dr. M!! When I lived in KY, wooly worms (as they are called there) were pretty accurate winter forecasters, for the most part. They even have a huge long term "Wooly Worm Festival" in Beattyville, Lee Co.
Member Since: 18 septembre 2005 Posts: 66 Comments: 13872
82. Destiny 02:01 GMT le 09 novembre 2005    
Those little Wooly Worms would be wearing Parkas in my neck of the woods. Its about ten below with 45 mph wind gust with blowing snow. BRRRRRRRRRRRRRR

Glad to see some of you filtering back in here.
Member Since: 1 septembre 2002 Posts: 10 Comments: 1
83. snowboy 03:36 GMT le 09 novembre 2005    
severe thunderstorms rumbling through Ohio, Michigan, and Indiana tonight..
Member Since: 21 septembre 2005 Posts: 10 Comments: 2546
84. iyou 03:46 GMT le 09 novembre 2005    
hi snowboy - I'm in T.O., will we be getting anything from that system?
Member Since: 25 juillet 2005 Posts: 0 Comments: 5219
85. iyou 04:10 GMT le 09 novembre 2005    
It's okay - I've heard on the radio - wind/rain...the usual.
Member Since: 25 juillet 2005 Posts: 0 Comments: 5219
86. Catskills 13:19 GMT le 09 novembre 2005    
Eureka - at last - a definitive study on the woolly bear! They're just like us. The Alaska study proves it. The 'bears' who correctly predicted the three mild winters in a row got complacent and were caught out. The other 'bears' lived in the same community, but had radically different opinions about whether the weather was mild or cold. :D
Member Since: 20 juin 2003 Posts: 0 Comments: 0
87. oriondarkwood 15:08 GMT le 09 novembre 2005    
I just posted some more photos if anyone wants to take a look
Member Since: 5 juillet 2004 Posts: 51 Comments: 41
88. WeatherWeasel 16:21 GMT le 09 novembre 2005    
Have not seen a wooly since I left Maryland years ago...but I'm a hairy guy, so I just base my prediction on the hair on my legs...it's going to be a cold winter here in south Florida, I might actually have to wear a sweatshirt for a few days this winter, brrrrrr...
There are 3 types of people down here:
Snowbirds - only here for winter
Re-located - moved here to stay from up north
Natives - born and raised in south Florida

Snowbirds never need a coat or jacket.
Re-located, might need a jacket, depending on how long they have been here.
Natives - wear a coat if the temp drops below 70. Hat and gloves if it drops below 60.
Member Since: 18 octobre 2005 Posts: 1 Comments: 50
89. sherrb 02:00 GMT le 10 novembre 2005    
In Oklahoma the persimmon seed test indicates we will have a warm, wet winter here

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About JeffMasters
Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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