Vortex2 tornado study finally gets some twisters to study

By: Dr. Jeff Masters , 1:56 PM GMT on June 08, 2009

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A proven way to reduce the incidence of dangerous weather phenomena is to schedule a multi-million dollar field experiment to study the phenomena. Up until this past weekend, that has certainly been true of this year's $10 million Vortex2 tornado study. The 7-week study (which also runs next year) has deployed an armada of over 100 storm chasing vehicles across the Great Plains this Spring, but has largely been frustrated by an exceptionally quiet tornado season. Tornado activity in May was less than half of what was observed last year in May, thanks to a ridge of high pressure that has dominated the weather. The residents of Tornado Alley ran out of luck over the weekend, though, as a strong low pressure system and associated cold front brought severe weather and multiple tornadoes to the region. Sixteen tornado reports were received by NOAA's Storm Prediction Center yesterday, and three on Friday. The team of University of Michigan students that has been writing our featured Vortex2 blog caught some excellent pictures of tornadoes on both Friday and Sunday. Yesterday was probably the last best chance for the Vortex2 project to document a strong tornado, since the project ends this Saturday and no significant tornado outbreaks appear likely for the remainder of this week.

Aurora, Colorado tornado yesterday
A tornado with a 3/4 mile wide debris cloud swept through Aurora, Colorado yesterday, staying on the ground for 8 - 11 miles and damaging a shopping mall, but causing no deaths or injuries. The tornado passed close to one of the high-resolution Terminal Doppler Weather Radars (TDWRs) that we now feature on our web site (see the radar FAQ for more details on these great new additions to our radar offerings). Posted below are the reflectivity and Doppler velocity images from the tornado, showing the amazing fine-scale details these high-resolution radars offer.



Figure 1. Radar reflectivity (top) and Doppler velocity (bottom) from the Denver, Colorado Terminal Doppler Weather Radar (TDWR), which caught the classic signature of a supercell thunderstorm tornado over Aurora, Colorado. A tornado dropped down from the low-level mesocyclone inside the parent supercell thunderstorm at the time of these images. Yellow colors located right next to greens/blues indicate that winds are moving towards and away from the radar in close proximity, the signature of strong rotation at low levels. Also visible on the plot are the winds spreading out from a downdraft on the rear side of the tornado. Black arrows denote the direction of wind flow. The dryline was bent back into a E-W orientation near Denver, creating an area of moisture convergence, which triggered thunderstorm formation.

Western Caribbean disturbance unlikely to develop this week
As area of disturbed weather over the Western Caribbean has brought rains of 2 - 3 inches over portions of Nicaragua and Honduras over the past few days. Wind shear is a high 20 - 30 knots over the disturbance, and no computer models are indicating that the disturbance will develop this week.

Jeff Masters, with help from wunderground's tornado expert, Dr. Rob Carver

Dying out after an official 24 minutes on the ground
Tornado (Fungus)
Tornado
Twisted (rrose1)
This was taken approximately 30 minutes after a brief tornado passed through South Hutchinson, KS tonight. The building is a bus manufacturing facility.
Twisted

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Quoting MobileMob:
Nice!! Just looked at the Sydney cam and it's looks like it's a beautiful day there.

Beautifully cold and windy
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Nice!! Just looked at the Sydney cam and it's looks like it's a beautiful day there.
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Quoting KEHCharleston:
How many of y'all have tried to cook an egg on the sidewalk?
Umm... and how many of you ate the eggs?


I cooked 1 on the bonnet of a car... and ate it. also made pancakes/flapjacks.
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Quoting StSimonsIslandGAGuy:
Weather456 what's the coolest and warmest temperature you've ever seen where you are in St. Kitts?


34C in April or May 2005

and 17C for several occasions during the winter of 2007-2008, which was one the coldest for islands.
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Quoting StSimonsIslandGAGuy:
5% of the way through the hurricane season and all's well!


When you put it that way, it doesn't sound so promising.
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1432. gator23
Quoting KEHCharleston:
How many of y'all have tried to cook an egg on the sidewalk?
Umm... and how many of you ate the eggs?



sounds tasty
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How many of y'all have tried to cook an egg on the sidewalk?
Umm... and how many of you ate the eggs?

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El Nino event 'may affect WA in coming months'
Tuesday June 9, 2009 - 11:26 EST

Scientists are monitoring weather patterns to determine whether an El Nino event will impact Western Australia later this year.

The Pacific Ocean weather pattern could see a continuation of below-average rainfall in parts of the Wheatbelt and Great Southern regions.

Farmers near Katanning and Gnowangerup have already been hit by dry conditions, recording their lowest May rainfall levels on record.

David Stephens from the Department of Agriculture and Food says there is a strong possibility an El Nino pattern will develop in the coming months.

"We've got slightly reduced sea surface gradient, we've got stronger high pressures in our region, we've got weaker long-wave troughs," he said.

"With the possibility of an El Nino, everything really is in the balance.

"We really have to watch in the next few weeks how the indicators will develop.

"At the moment there's been a little bit of warming in the eastern Pacific, and a bit of a rise in pressure in the Australian region.

"So we're really at a point where it may develop in the next month or two, or it may rebound and go back to a more neutral, normal pattern."

© ABC 2009
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Quoting Weather456:


I highlighted it in post 1414

Full size image



Thanks 456!
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Quoting HaboobsRsweet:
Yes, it is hotter than crud here in Southern Mississippi. I went running today at 3PM and lost every drop of water in my body within two minutes. We could use a cool off. It has been a fast transition to summer. If this keeps up for the next two weeks, then the Gulf will be a boiling pot of water for some good storms. Long range forecast shows a lot of clear skies and hot days for the next two weeks.


Bout the same here in SE TX. Humidity is climbing through the day. Up to 66% now. Wind dying out of the S at 8. The Icky Sticky's are here to stay. I'm out to watch Deadliest Catch and Out of the wild. Thanks for answering my quetions y'all. And for the laughs. Got my fingers crossed for ya Antonio. ;) Lol. BBL.
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Quoting sporteguy03:

456,
I can barely read that but I think it says moderate for Caribbean development? lol


I highlighted it in post 1414

Full size image

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Quoting Weather456:


456,
I can barely read that but I think it says moderate for Caribbean development? lol
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Nice blog tonight ---

Angelic is never a word that can be used regarding Orca - its all a coverup, just lift the halo a little, watch what falls out!

Habo - are you out of your mind running at 3 pm when "its hotter than crud?"

Pat - I hope you pick up the remains and send them back.

There are days here in the summer where the asphalt actually gets syrupy. Ick. But, you have to admit we don't have to use snow shovels....

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Quoting MobileMob:
Good Evening all, humidity is horrible in Mobile as always. Now it's
85F
Feels Like: 90F
Wind Chill: 85
Heat Index: 89
Dew Point: 70 Wind: 6mph
Humidity: 61%
Pressure: 29.94in Gusts: 0mph

Come to Sydney Australia now at 09:50 EST
Temperature: 11.5C (52.7F)
Relative humidity: 35%
Feels like: 9.1C (48.4F)
Wind: W 22km/h (16.6mph)
Wind gusts: 35km/h(21.7mph)

Snow on Melbourne's outskirts.

Snow on the western side of the Blue Mountains NSW

Falls Creek Victoria

Thredbo NSW

Thredbo Supertrail.


More Snow cam's here Link
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Yes, it is hotter than crud here in Southern Mississippi. I went running today at 3PM and lost every drop of water in my body within two minutes. We could use a cool off. It has been a fast transition to summer. If this keeps up for the next two weeks, then the Gulf will be a boiling pot of water for some good storms. Long range forecast shows a lot of clear skies and hot days for the next two weeks.
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Global Hazards

3. Increase chance of tropical cyclogenesis in the Western Caribbean due to low level convergence, regions of low shear and warm ssts. Confidence: Moderate


IMO, Confidence is uncertain
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Quoting Orcasystems:


Gasp!!! that may be first time those words have been used in relation to me.. quick.. someone save them.. Vortex will never believe it.


Lol. Y'all are a hoot!
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Quoting nrtiwlnvragn:


caribweather.net has links to most countries


Thanks..I remember going to: http://weather.caribseek.com/ when Arthur was made landfall in Belize last year
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Quoting homelesswanderer:


Uh Oh! Hurry Antonio knock wood three times!! Our angelic friend is right. Lol. We've become very superstitious round here in the last few years. Thats why my husband told me not to change my WU name. Lest mother nature thinks I'm getting cocky. Lol.


Gasp!!! that may be first time those words have been used in relation to me.. quick.. someone save them.. Vortex will never believe it.
Member Since: October 1, 2007 Posts: 81 Comments: 26516

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LOL! No I don't want a Cane I had been in two of them George & Hortense and is not funny been two moths without electric power & potable water and see your country flood. Thanks God that we have FEMA back in up us in those situations.
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Quoting Orcasystems:


Ohhhh now that was a silly thing to say... you know your just asking for one now.....


Uh Oh! Hurry Antonio knock wood three times!! Our angelic friend is right. Lol. We've become very superstitious round here in the last few years. Thats why my husband told me not to change my WU name. Lest mother nature thinks I'm getting cocky. Lol.
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Quoting Weather456:


I know when there are watches and warnings for the USA/PR but other than tropical cyclone watches and warning, I won't know about the islands. Is there a possible way to get watches and warnings for the Caribbean. I think there are official sites for each island country. no?


caribweather.net has links to most countries
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Quoting Joanie38:


Hi Savannah..thank you for that info!! I am understanding more now thanks to you all!! Nice to meet you as well Savannah!!! :)


Nice to have you on board!
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I gotta go for now...gonna help hubby cook..:) i'll check back on the blog in a little while...nice meeting you all...:)
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1405. Patrap
AGW aint just for Models..


Wait till 2025 rolls around.





Member Since: July 3, 2005 Posts: 428 Comments: 129770
Maximum Temperature
40.2 C at 16:31 on 03 June


Minimum Humidity
12 % at 16:41 on 03 June

We live close to the ocean (everyone does.. its an Island), but you would have to call it a dry heat.
Member Since: October 1, 2007 Posts: 81 Comments: 26516
Good Evening all, humidity is horrible in Mobile as always. Now it's
85°F
Feels Like: 90°F
Wind Chill: 85°
Heat Index: 89°
Dew Point: 70° Wind: 6mph
Humidity: 61%
Pressure: 29.94in Gusts: 0mph
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Quoting Orcasystems:



Sure... everyone on here says come visit Florida.. come visit Georgia... go to NOLA... are you guys NUTS. Even you don't like the heat.


Lol.
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Quoting Weather456:


I know when there are watches and warnings for the USA/PR but other than tropical cyclone watches and warning, I won't know about the islands. Is there a possible way to get watches and warnings for the Caribbean. I think there are official sites for each island country. no?

Yeah. There is a separate site for each country. Ours is http://www.metservice.gov.jm/
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Quoting SavannahStorm:
The main difference between dry and humid heat:

100 degrees at 15% humidity feels like 96 degrees.

90 degrees at 80% humidity feels like 113 degrees.


Dry heat allows your sweat to evaporate quickly, lowering your body temperature. Humidity traps the sweat onto your skin, along with your body heat.


Hi Savannah..thank you for that info!! I am understanding more now thanks to you all!! Nice to meet you as well Savannah!!! :)
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Quoting Weather456:
weatherwatcher12,

You guys under a flash flood watch?


I know when there are watches and warnings for the USA/PR but other than tropical cyclone watches and warning, I won't know about the islands. Is there a possible way to get watches and warnings for the Caribbean. I think there are official sites for each island country. no?
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Quoting antonio28:


WoW 104 in Canada! Thats hudge, And we here in PR get upsept with a 90, I guees that we are lucky to live in the tropics. Beside the Huricanes weather is just perfect down here! We can deal with one cane every 10 years (avarege). LoL


Ohhhh now that was a silly thing to say... you know your just asking for one now.....
Member Since: October 1, 2007 Posts: 81 Comments: 26516
1394. msphar
I'm in Northern Nevada right now, its 71F with a pleasant little breeze (4 MPH) and some cloud, 22% humidity. Very comfortable outside.
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Quoting SavannahStorm:
The main difference between dry and humid heat:

100 degrees at 15% humidity feels like 96 degrees.

90 degrees at 80% humidity feels like 113 degrees.


Dry heat allows your sweat to evaporate quickly, lowering your body temperature. Humidity traps the sweat onto your skin, along with your body heat.



Sure... everyone on here says come visit Florida.. come visit Georgia... go to NOLA... are you guys NUTS. Even you don't like the heat.
Member Since: October 1, 2007 Posts: 81 Comments: 26516
Quoting Orcasystems:
I live in Victoria BC Canada... where it is NOT suppose to get to hot.. this is straight off the weather station from a few weeks ago.

Maximum Temperature
+40.2 °C at 16:31 on 03 June

For those who do not know how to convert C to F ... thats 104 F... thats just wrong in so many ways for this climate.




WoW 104 in Canada! Thats hudge, And we here in PR get upsept with a 90, I guees that we are lucky to live in the tropics. Beside the Huricanes weather is just perfect down here! We can deal with one cane every 10 years (avarege). LoL
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Quoting CatastrophicDL:

Joanie, we've been having a break in the temps in the west for a while. We've been about 15 degrees cooler than normal. Right now the forecast has LV warming up the day you come, but you never know, it may stay cool a few more days for you.


HI Catastrophic..:) Are you near LV? I am excited.. never been out that way..lol...It's nice to meet you..:)
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The main difference between dry and humid heat:

100 degrees at 15% humidity feels like 96 degrees.

90 degrees at 80% humidity feels like 113 degrees.


Dry heat allows your sweat to evaporate quickly, lowering your body temperature. Humidity traps the sweat onto your skin, along with your body heat.
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Quoting Weather456:
weatherwatcher12,

You guys under a flash flood watch?

yep
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1388. ackee
Quoting weatherwatcher12:
kingston forecast:

Tuesday Night
Thunderstorm. Low: 77 °F . Wind SE 13 mph . Chance of precipitation 100% (water equivalent of 1.86 in). Heat Index: 87 °F .

Wednesday
Thunderstorm. High: 89 °F . Wind SE 40 mph . Chance of precipitation 100% (water equivalent of 1.95 in). Heat Index: 93 °F .

Wednesday Night
Thunderstorm. Low: 78 °F . Wind SE 17 mph . Chance of precipitation 100% (water equivalent of 4.81 in). Heat Index: 89 °F .

Thursday
Thunderstorm. High: 86 °F . Wind SE 35 mph . Chance of precipitation 100% (water equivalent of 3.08 in). Heat Index: 93 °F .

Thursday Night
Thunderstorm. Overcast. Low: 78 °F . Wind SSE 13 mph . Chance of precipitation 60% (water equivalent of 0.31 in). Heat Index: 89 °F .

Friday
Thunderstorm. High: 87 °F . Wind SE 53 mph . Chance of precipitation 80% (water equivalent of 0.64 in). Heat Index: 96 °F .

Friday Night
Thunderstorm. Low: 78 °F . Wind SE 15 mph . Chance of precipitation 70% (water equivalent of 0.43 in). Heat Index: 89 °F .

Saturday
Thunderstorm. High: 86 °F . Wind SSE 31 mph . Chance of precipitation 80% (water equivalent of 0.89 in). Heat Index: 100
I just dont think we get that much rain in jamaica lets see
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weatherwatcher12,

You guys under a flash flood watch?
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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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