Tuesday, April 27, 2010
3 Days and counting...
It's been about 11 months, but it's time to fire up the blog again for the second season of VORTEX2 which begins on Saturday. I'm still in State College, getting ready to fly out to Oklahoma City on Friday morning.
It's amazing that a year has gone by already. The highlights since the last project include a nice trip to Maine last August, starting grad school, road trips to away PSU football and basketball games, a trip to Atlanta for the American Meteorological Society conference, and a great spring break trip to Las Vegas. I've been busy with school work too. I've been averaging about 3 classes each semester and just finished up my M.S. research.
Unfortunately, the next 3 days will be the busiest of the semester. Leaving a week before the semester ends means that I'm busy making up final exams early, while still trying to finish up projects and homework (not to mention packing!). The good news is that all work will be done by tomorrow night so there will be some time to relax with friends that I won't see for the next 6 weeks (or longer).
This year's installment of V2 promises to be just as exciting as the last one. Though it's been another very quiet year so far in terms of tornadoes, the pattern has begun to shift with recent outbreaks in Mississippi and the Texas Panhandle. It looks as if a trough will dig into the Western US later this week and hang out for the next week or two which is a good sign for severe weather in the Great Plains. Last year we only saw one tornado-- though I certainly don't wish destruction for anyone, if tornadoes are going to happen, hopefully we can be there to collect data on them-- hopefully this year will be more active.
Things should be pretty similar to last year. I'll still be driving the same mobile mesonet probe with the same navigator, Spider-spud, and plenty of hail dents. If I remember correctly, we even left a few cracks in the windshield that need a good hailstorm so we have an excuse for a new windshield. A few new people are going along this year -- one of my roommates and fellow grad student Andrew, and PSU alum Julie. Unfortunately Kevin, Ben and Phil wont be out with us this year; we'll definitely miss them.
So that's all for now. Like last year I'll try to post as often as possible (probably 2 or 3 times a week) or whenever anything cool happens! Thanks for reading, and the next post will be from the field!
Thursday, June 11, 2009
We're not in Kansas anymore
rotating wall cloud right before we drove under it.
After spending the night in Witchita, we again chased storms in southwestern Kansas on wednesday. The day was mainly cloudly and rainy, but eventually we hit a patch of sunny skies that we needed to heat up the ground and give us the explosive energy for thunderstorms. Some weak supercells developed in a line near Hugoton, KS that we chased on. Some of the features of note included a shelf cloud and some impressive mammatus clouds. Dark came, so we quit on those storms, but a brief tornado was reported and confirmed by photos after we ended on the storm. The 2 hour ride back to Dodge City was full of rain and wind, but eventually we made it back to our western themed hotel to have dinner around midnight in the hotel restaurant which they were nice enough to keep open for us.
shelf cloud
mammatus clouds
Today was a mess. All in all, it will probably go down as one of the most indecisive days of the experiment by the PI's which led to some low morale among everyone. This morning, things looked really great near Amarillo in the TX panhandle, so we all woke up early and headed south. After driving three hours, we got the message to hold up as new targets were being evaluated. We waited between two targets (both of which were about 3 more hours away) further south in TX or back north in Colorado for a valuable hour. Eventually it was decided among the PIs (reportedly by a coin flip) to back track and go back North to south eastern colorado. Although the decision was widely agreed to be a bad one at the time, we lucked out and got onto some very impressive storms near La Junta, CO. At times it looked like a pair of supercells right next to each other would both produce tornadoes simulataneously, all within our view. However, this dream scenario never really played out. The storms were very impressive to look at and had a lot of medium sized hail that piled up about an inch on most of the roads. One of the storms reportedly had a breif tornado, but we missed it again!
Today's storm as we approached. There's the barrel updraft, wall cloud, and rainshaft.
rain and hail pouring out of the storm as it became sort of a heavy-precip storm.
Friday, June 5, 2009
I never thought my first tornado would be in Wyoming...
cows in the middle of the road
That storm soon died out, but another one formed to our Northwest, above Cheyenne. We quickly moved west on I-80 to intercept it. As we approaced Cheyene, the radar indicated rotation at low levels in the storm and a lowering in the cloud base was visible from miles away. I was honestly scared for Cheyene at the time, in that any tornado would blow through the downtown area. We followed P1 into the "bearcage" - the area inside the hookecho where rotation exists in the storm a!nd a tornado would form. However we were in downtown Cheyenne, so we realized any intercept would be really messy. We pulled out of Cheyenne back east on I-80 and hit massive amounts of hail. At times it looked like winter with over an inch of pea sized hail all over the roadways.
hail on I-80
if you look hard, you can see the tornado (my camera has bad resolution, it looked better than this)
First, a funnel cloud dropped out of the base reaching half way to the ground with some visible debris on the ground, A TORNADO! this first weak tornado died quickly. It wasn't long before our probe got lost in hail and had no view of the rotating wall cloud. (this sounds unsafe, but we were on teh back side of the storm so not in harms way). When we turned around after our transect, we encountered some golf ball sized hail. While i was driving i noticed a dark spot in the rain/hail curtain in front of us. After driving a little further i soon realized i was looking at a fully formed cone-shaped tornado about a mile ahead of us. The tornado at this point was possibly a quarter mile wide. At this point we had good viewing of the tornado for several minutes but encountered steadily bigger hail getting thrown out of the updraft. We were forced to slow down and eventually stop when our windshield took on heavy cracks all over as we got slammed by baseball sized hail.
notice the hail bouncing in the grass, and our windshield
we actually took bigger hail than this, but i didnt feel safe getting out of the car in that stuff.
We came upon probe 1, which was stopped at the side of the road with a much uglier windsheild than ours and lots of their instruments pulverized. We stayed with them and got out of our car to observe the tornado "roping out" - or thinning and bending as it dissipated. We then followed probe 1 behind the storm to watch it for further development, however, we couldnt go in because both our windshields clearly couldnt take any more hail. At one stopping point, we realized we were parked infront of an underground nuclear warhead silo (Wyoming and nebraska are where the US government keeps their nukes). We were soon visited by some military security in a pick up truck asking us to leave the premises immeadiately!
After taking a few more pictures of the storm, we took probes 1 and 3 back to cheyene where we are now to await replacement windshields tomorrow. The rest of the armada followed the storm east into nebraska where it produced another tornado after dark (so the weather channel tells me from my hotel room in Cheyene).
This was probe 1 after the intercept, we took similar damage in
probe 3.
All in all it was an amazing day. The tornado was on the ground near La Grange, WY for over 24 minutes. It moved slowly, allowing V2 to sample it the whole time. It was under mobile radar coverage at all times. The tornado pods took a direct hit from the tornado, as well as the TIV. Sticknets were well positioned and the mesonets had it surrounded. Personally, our misison was a great success in probe 3, as we got all the data we could have asked for in the spot we were supposed to be in. This was the most intensively observed tornadic supercell in history--and somehow I managed to be part of it!
Personally, i couldnt stop smiling all day as this storm was amazing. Being in 3-4 inch hail itself is exciting not to mention when you can see a tornado less than a mile away!!! On the drive back, Kiel commented: "can you believe we get PAID to do this?!" It was a great day, and tomorrow we will try to join up with the rest of the armada as soon as we get a new windshield.
The experiment ends next saturday, and every day between here and there looks like it has the possibility of tornadoes. The first 4 weeks, though slow have prepared us for what looks to be an awesome time!
Wednesday, June 3, 2009
The calm before the storm(s)
Since I last posted, I've been to Nebraska, Iowa, back to Nebraska, and finally Kansas. On Sunday, we drove East from Grand Island, NE to an area along the Missouri River in Eastern Nebraska and western Iowa where the PIs (Principal Investigators, aka big wigs) thought conditions were favorable for the development of supercells. We spent much of the day at a truck stop in Lincoln, NE, and then moved across the river to Council Bluffs, Iowa. Kiel, Kevin and I along with the rest of the V2 armada sat in a parking lot for a few hours waiting for convection to initiate. Eventually we saw this to our Southwest blossoming over southeastern Nebraska:
convective initiation
the storm started to get going...
a small, but cool-looking precip core
We soon moved south to get infront of the storm. Spirits were high considering we had a good amount of low-level shear for supercells (change in the wind speed and direction with height that causes storms to rotate). After sitting pat while we waited for the storm to develop and cross into Iowa where we were waiting to intercept it, the mobile mesonets began doing some transects in the hilly terrrain of Southwest Iowa. The storm had a huge anvil, but unfortunately that was about it. Though there was a ton of lightning it soon died out and showed no signs of rotation.... somewhat odd considering the environment.
when you look through the storm and see the sun shining, you know something went wrong...
Though we were somewhat dissapointed in the storm's development, we spent the night in luxury at the Hilton Omaha. It was a nice hotel, but unfortunately we had little time to spend there the next day. The fleet moved on south back through Lincoln to intercept some more storms on Monday along the Nebraska/Kansas border. After some long hours waiting again in a truck stop, we chased down and intercepted a storm just north of the border near Hebron, NE. The storm was not a supercell, but did interact with a few nearby storms to produce a line of heavy precipitation with some small hail and some pretty intense wind gusts. We clocked one gust in probe 3 at over 60 mph. Some other members of the team saw a few funnel clouds and some reported "gustnadoes' which are tornado-like vortices that develop along the gusty winds that flow out of a thunderstorm. They are weaker than tornadoes, and don't feature a funnel cloud. The team also had our first run-in with messy dirt roads. Probe 4 got stuck in the mud during the storm on a dirt road south of us, however they were able to manuver their way out eventually. That night we quit early in order to drive to our location for the night in Salina, KS.
Yesterday was a travel day and the project moved west to Colby, Kansas which is in the Northwest corner of the state. This decision was a little frustrating for a lot of us, because of the reports of supercells in Texas and two tornado reports in southern Kansas. While the team possibly could have made it to the Kansas storms in time, it would have been a difficult drive given our position the previous day. The PIs also thought that it would be good to rest up the teams and do vehicle maintenace because it seems like we might be operational for several days in a row later this week and weekend given the favorable conditions in the forecast (more about that later).
We took the free time yesterday to do some bowling and visit a local bar called "Twisters". It was the only bar in town, but conveniently had a stormchasing theme so the locals got a kick out of it. It's been odd getting used to the quasi-celebrity status of being a storm chaser in a small town. The other night while eating dinner, a mom brought her kids over because they were dying for our autographs. The vehicles are especially popular with the locals, as we'll usually find people taking pictures of the probes in parking lots or on the road.
Today was another down day. I slept in and then took some time to catch up on laundry after a big breakfast. Later on we visited Sonic for some free root beer floats and got dinner at the only real restaraunt in town, connected to the Comfort Inn. I've also done a little bit of lounging around and caught the end of Ghostbusters on TV.
The rest of the week looks like it should be awesome weatherwise. There will finally be upperlevel flow as the jet stream moves south. What this means is that wind shear will increase, forcing storms to rotate. Rotation is one of the main characteristics of a supercell, and is a needed ingredient for tornadoes. The tough part will be getting enough moisture to flow up from the Gulf of Mexico to make the atmosphere unstable enough for explosive convection with low cloud bases. So far in the experiment, we've been missing both the shear for rotation and the moisture to have low cloud bases which are also needed for tornadoes. The pattern for the rest of the experiment looks alot better for both ingredients, so there is a general air of optimisim around the project.
Personally, I can't wait to get on some real storms. I've been hearing from a lot of the more experienced chasers about the circus that will result from all the amateur chasers that are out, especially after such a quiet period. Hopefuly the experience that we've gotten so far on the project will help things go smoother in the face of more dangerous storms and more crowded roads. Speaking of missions, Kevin was sadly moved from Probe 3 to P7 to help out over there leaving just Kiel and I in probe 3. We could possibly be operational for pretty much everday over the rest of the project, so I'll be really busy. I hope to update the blog as frequently as possible, but I can't make any promises. Though, If i do see a tornado I'll be sure to make a note of it!
Only about 10 days are left on the project which is really hard to believe. It's been an amazing journey so far, and it looks like it will only get better. I've learned more about severe storms and forecasting them in the past 2 and a half weeks than in 4 years at PSU. However, despite all the cool people I've met and friends I've made it will be nice to get back to Pennsylvania and catch up with old friends and sleep in my own bed when this is all over.
Saturday, May 30, 2009
back to nebraska...
In Topeka we got some great BBQ at a place called Boss Hawgs. Given the lack of weather and things to do in Topeka, we took two probes out to the local movie theater to see Angels and Demons. It was a good movie, but not nearly as good as the book. We later returned to the parking lot to discover our probes had been tagged by some locals with nothing better to do, then spent some time at the hotel bar.
The next day (yesterday) broke many records, but not good ones. Conditions were marginal (and i mean marginal) for supercells to develop over central Nebraska, so we hit the road fast from Topeka and chased after them. After a few hours of driving we finally caught up with a developing storm 30 miles south of the South Dakota border, but by the time we got there it was already weakening. When we completed a few transects of the storm with our probe, we decided to cut our losses and head home, possibly intercepting another storm on the way. However, local law enforcement had other plans. The probe i was driving, as well as probe 1 behind me were pulled over by the local sheriff for speeding. Though we got off with a warning, we soon learned that ben's probe (p5) and several other vehicles had also been pulled over by the same cop.
After the slight delay we drove south to Grand Island, where we had been earlier that day to spend the night in the local holiday inn. Overall, we were told the trip was over 600 miles- a V2 daily mileage record, with a record number of police encounters. All for a rainshower....
Today is a down day and tonight we will have a review of our missions and data collected so far as well as have a mid-experiment meeting to discuss how things have been going so far with each group. We'll stay here tonight, then either head towards minnesota and eastern South Dakota, or down to the Texas panhandle for operations tomorrow or monday. Overall , the weather pattern is looking a lot better for severe weather so we should see something good in the upcoming week.
In the meantime we've been having lots of fun visiting local restraunts and bars. Our trip coordinator has managed to get us into great hotels and usually lands us free drinks at the hotel bars we go to. We've also been getting to know our new mesonet navigators. Replacing harald in our probe is Kiel Ortega - an NSSL employee from OU.
We've also gotten some attention from the weather channel for our probe mascots ,that resulted in a piece aired last night featuring me, as well as all the other probe drivers which you can see at:
http://www.weather.com/multimedia/videoplayer.html?from=email&bcpid=823425597&bclid=877032950&bctid=24756145001
That's all for now, sorry for the lack of anything too excting, but things are like that lately.
Wednesday, May 27, 2009
"You guys might want to put your glasses on"
Sunset behind an anvil
The lack of action changed yesterday. We drove Eastward from Childress towards an area of high CAPE (convective available potential energy, which is an index of the amount of buoyant energy in the air) and very high dewpoints. With surface temperatures near 90 and dewpoints it was very very humid. We spent most of the afternoon and evening in Gainesville, TX (just north of Dallas) waiting for the first storm to go up. I was anticipating a good chance of tornadoes as my advisor said "we'd have to be stupid not to see a tornado today". (note the ironic foreshadowing) Eventually a storm did go up just West of Ft. Worth. Because dallas/ft. worth has the worst traffic next to LA in the US and it was rushour, we had no hope of chasing a storm moving over that area. We stayed north hoping that another storm would initiate closer to our position in more favorable chase terrain. After an hour or two we realized that the dallas storm was our only option so we moved towards it, hoping to catch it as it moved out of the urban area.
Near Witchita Falls we saw a few wild camels along the road.
However, on our way, the storm split and sent an left moving storm off to the north of the main right mover. The left-mover had an anticyclonic (clockwise) rotation and a hook echo. Most supercell storms have a cyclonic, or counter-clockwise rotation. The left mover soon became the dominant storm which is very uncommon as the left mover usually dies in preference to the right-mover. We chased the left-mover near Decatur, TX (to the northwest of Ft. Worth). Inside the storm we encountered golfball and larger sized hail. While we measured 1.75" hail, larger hail soon hit us that we suspect was over 2 inches in diameter. This prompted Harald to put on his goggles and encouraged us to put on our sunglasses just incase of a windshield crack.Rising scud into the left-moving anticyclonically rotating updraft.
Some hailstones we collected.
The storm became very ominous looking with rising scud, however outflow overran the circulation and prevented it from ever dropping a tornado. It soon turned dark while we were under the storm so operations were called off. However, on our way out we somewhat accidentally ended up right underneath the heart of the circulation, where a tornado would drop in the now-cyclonic circulation of over 60 m/s (150 mph) wind shear aloft. Fortunately for us, the DOWs reported the circulation was well above us and had no hope of reaching it to the surface. Otherwise, it would have been very unsafe to be where we were, especially at night. Overall, we got very good data with 6 radars and around 10 mesonet probes, making this the most extensively studied left mover ever.
WSR-88D velocity mode, showing a cyclonic couplet with TVS (tornado vortex signature, pink wedge) just above our position (circle).
After we left the storm we moved north to Norman, OK for the night and got a spectacular lightning show behind us as we drove. Today we hung out in Norman for a down day with no VORTEX2 related operations going on because of calm weather. I took today as a chance to get some laundry done at the local laundromat, and Kevin and I got an oil change for our probe since it's gone over 5000 miles in the past few days. The off day is a great chance to relax since we've been putting in 14 hour days and over 500 mile drives per day in lately. Tonight we hope to head into OKC for some dinner and then visit the local bars with some of the OU grad students on V2. Today also marks the last day on the trip for our navigator Harald Richter, who will be replaced by an OU grad student in our probe. He was a great guy to have around and a great resource for questions that kevin and I fired at him. The weather channel did a special on him yesterday that featured him and our probe, so look for him, probe 3, and kevin and I on TV tonight or tomorrow.
It's hard to believe that there are only 2 weeks left in the experiment, and we haven't even seen a tornado yet. This looks to change in the upcoming week though as conditions improve. We're all losing track of the days of the week and are in a state of constant exhaustion from the driving. However, if you ask anyone out here (including me) they'll tell you we're having the time of our lives!
Sunday, May 24, 2009
I'll have the Texas...
Part of the armada waiting in the hotel parking lot in Hot Springs, SD
After spending the night in North Platte, NE it was soon apparent that we were going to have little luck remaing up north. With the jet stream in Canada and little moisture and no energy over the northern and central plains, the decision was made to head south. Far South. Today we drove from North Platte, to Amarillo, TX; a 500 mile drive that took approximately 9 hours. I navigated for the FC again today, which is much less exciting on a travel day than during a deployment. On the way to Amarillo we accidentally came upon a fairly strong storm with lots of scud and a lowered shelf like cloud. It was an outflow dominated storm with no rotation so there was no hope of a tornado, but it was still very cool looking.
Once in Amarillo, we had dinner at The Big Texan, a famous steakhouse whose claim to fame is the "free 72 ouncer" -- a 72 oz. steak that is free if eaten in under an hour. Trying to avoid a nasty car ride tomorrow i opted out of the challenge. Instead I had an excellent steak and tried some fried okra for the first time. I came to the conclusion that all fried food really tastes the same so it was nothing special.
Outside The Big Texan
Tomorrow looks to be a "go" day with the chance for both CAPE over 1000 j/kg and shear maybe getting close to 30 kts. We can only hope for a supercell and maybe, just maybe a tornado either tomorrow or tuesday!