The Tornado Intercept Vehicle 1 (TIV 1) and Tornado Intercept Vehicle 2 (TIV 2) are vehicles used to film with an IMAX camera from very close to or within a tornado. They were designed by film directorSean Casey. Both TIVs have "intercepted" numerous tornadoes, including the June 12, 2005, Jayton, Texas tornado, the June 5, 2009, La Grange Wyoming tornado, and the strongest intercept, made by TIV 2, the May 27, 2013, Lebanon, Kansas tornado.
The Tornado Intercept Vehicle 1 (TIV 1) is a heavily modified 1997 Ford F-Series F-Super Duty cab & chassis truck used as a storm chasing platform and built by Sean Casey.[1] This heavily armored vehicle can drive into a weak to relatively strong tornado (EF0 to EF3)[citation needed] to film it and take measurements. Work began on the TIV in 2002 and took around eight months to finish, at a total cost of around US$81,000. TIV's armored shell consists of 1/8–1/4inch steel plate welded to a two-inch square steel tubing frame. The windows are bullet resistant polycarbonate, measuring 1.5in (38mm) thick on the windshield and 0.5in (13mm) thick on the sides.[2] The TIV weighs approximately 14,000lb (6,400kg) fully loaded[3] and is powered by a 7.3 litre Ford Powerstroke turbocharged diesel engine manufactured by Navistar-International, otherwise known as the International T444E.[citation needed]
The vehicle includes air-ride suspension that, when deployed, drops the vehicle flush to the ground to prevent wind from getting under the vehicle. Four hydraulic claws were added at Discovery Channel’s request for safety, which are used to grapple onto the ground and anchor the TIV during an intercept. The vehicle's speed was limited by the factory Ford PCM, giving it a top speed of 100mph (160km/h).[4] The TIV has a fuel capacity of 60 US gallons (230L), giving it a range of around 500 miles (800km). The TIV is featured in a series called Storm Chasers which began airing on the Discovery Channel in October 2007.[5][6] TIV was succeeded in 2008 by TIV 2, but returned to service to finish out the first few chases of the 2008 storm chasing season after TIV 2 suffered mechanical problems. In a June 2011 interview with NPR's All Things Considered, Casey said that TIV was still in service and is designated as the backup vehicle in the event TIV 2 breaks down during a shoot.[7]
After no longer needing the vehicle, Casey abandoned the vehicle on a central Kansas farm.[8] Casey placed the TIV as a prize for a scavenger hunt, where the first one to find the TIV would be able to keep it.[9] Wichita-based storm chaser Robert Clayton found the vehicle in 2020, after searching for it on Google Earth.[10] Clayton's restoration plan for TIV 1 includes removing the claws and adding hydraulic anchoring spikes similar to TIV 2, repairing the air-ride suspension to drop TIV to the ground to prevent wind from getting underneath the vehicle, repainting the vehicle black, and adding instrumentation to collect data for future research.[citation needed]
Casey and his team developed and built the second Tornado Intercept Vehicle, dubbed TIV 2, to be featured in their next IMAX movie and the Storm Chasers series.[11] Work began in September 2007 by forty welding students at the Great Plains Technology Center in Lawton, Oklahoma and was completed in time for the 2008 tornado chase season. TIV 2 was designed to address some of the problems experienced with the original TIV, namely its low ground clearance, lack of four-wheel drive, and low top speed.The TIV 2 has the ability to withstand wind speeds up to 130MPH not deployed. Deployed, it can withstand a 250MPH headwind. It is based on a DodgeRam 3500 that was strengthened and converted to six-wheel drive by adding a third axle.
After season two, the six-wheel drive system was modified to four-wheel drive.[citation needed] It is powered by a 6.7-liter Cummins turbocharged diesel engine, modified with propane and water injection to produce 625 horsepower (466kW). This gives TIV 2 an estimated top speed of over 100mph (160km/h). Its fuel capacity is 92 US Gallons (348 L), giving TIV 2 an approximate range of around 750 miles (1,210km). The body of TIV 2 is constructed of a 1/8-inch steel skin welded over a 2in (51mm) square tubing steel frame. The windows in TIV2 are all bullet-resistant 1.63in (41mm) interlayered polycarbonate sheets and tempered glass. TIV2 also features an IMAX filming turret similar to the one on the original TIV. The original TIV's air ride suspension mechanism was not used on TIV 2 in favor of six hydraulic skirts that drop down to deflect wind over the TIV to stabilize it and protect the underside from debris. It was also not originally equipped with hydraulic claws.
TIV 2 debuted on the second season of Storm Chasers, which began airing on the Discovery Channel in October 2008. Its initial performance did not go well, as it was plagued by mechanical failures, including several broken axles, which forced Casey to abandon TIV 2 and return to chasing in the original TIV until TIV2's issues could be resolved.[6][12] Despite Discovery Channel showing that TIV 2 was out of commission for the majority of the season, TIV 2 could be seen chasing through to the end of the season, including the May 29, 2008 Kearney, NE tornado, though it was not shown in the series.
In the fall of 2008, TIV 2 received several modifications, mostly focused on reducing the vehicle's 16,500lb (7,500kg) weight. To achieve this, less crucial areas of TIV 2's armor were converted from steel to aluminum while more vital areas were reinforced with supplemental composite armor consisting of thin layers of steel, Kevlar, polycarbonate, and rubber. In all, the weight reduction measures brought TIV2's weight down to 14,300lb (6,500kg). The safety systems were also improved, with the three front wind flaps being consolidated into one skirt, and new hydraulic stabilizing spikes to further increase stability in high winds. Other modifications included additional doors that provided every seat position with an exit (wind skirts up or down), and a redesigned IMAX turret with 50% more windows. The third axle was disconnected from the drive train, thus changing TIV 2 to a 6×4 from its 6×6 design. The third axle now acts as a brace for the vehicle's weight.[6]
The TIV 2 appeared again before the halfway point of the third season of Storm Chasers. In between seasons three and four of Storm Chasers, TIV 2 also appeared in an episode of another Discovery Channel series, Mythbusters, wherein both the TIV 2 and the SRV Dominator vehicle operated by Reed Timmer of TornadoVideos.Net were tested to determine their endurance to storm-force winds by being parked behind a Boeing 747 with the engines at full throttle. When tested at a wind speed of 160mph (260km/h), the TIV 2 had the driver's door pulled open, though this was due to human error, as Casey forgot to lock the door prior to the test. When tested again at 250mph (400km/h) (equivalent to an EF5 tornado), the TIV 2 suffered no ill effects other than the anchoring spikes being slightly bent; the Dominator ended up being blown approximately 50 feet (15m), although it remained upright.[13] TIV 2 would intercept a tornado near La Grange, WY in 2009 which would be his intercept shot he needed for his IMAX film. Future chases in TIV 2 would be for b-roll footage of the TIV 2 and for his new IMAX film.
In 2011, a siren was added to the vehicle to allow the TIV 2 to act as a mobile warning system for civilians in the path of incoming tornadoes, after several incidents earlier that year where the TIV 2 team was unable to effectively warn locals of the imminent danger of the tornadoes they were tracking, especially during the 2011 Super Outbreak.[14] On April 27, 2011, the TIV 2 team intercepted an EF4 tornado that hit near Enterprise, Mississippi. While not in the path but 200 yards from it, it was the first tornado he shot with his new stereoscopic IMAX camera. Casey removed the rear flap in early 2012 and built a new set of two hydraulic spikes that go into the ground during an intercept.
On May 27, 2013, TIV 2 intercepted a large tornado near Smith Center, Kansas. The vehicle was struck by large debris from a nearby farm and suffered damage to the roof-mounted anemometer and at least two breaches of the crew compartment when the roof hatch and one of the doors were blown open. Before the anemometer was disabled, it recorded winds of 150 to 175mph (241 to 282km/h), placing the tornado in the EF3 to EF4 range.[15]
On October 21, 2019, Casey listed the TIV 2 on Craigslist for US$35,000[16] and it was later sold to storm chaser Ryan Shepard.[17] The TIV 2 was fully restored and back on the road again in the 2021 storm season, where it made multiple close intercepts on June 10 in western North Dakota. It is under sponsorship of Storm of Passion and Live Storm Chasers.[18]
Instrumentation
Although primarily designed to shoot film from near or within tornadoes, the TIVs have at times been outfitted with meteorological instrumentation atop masts to complement the Doppler on Wheels (DOW) radar trucks of the Center for Severe Weather Research run by atmospheric scientist and inventor Joshua Wurman.[19]
Storm chasing is broadly defined as the deliberate pursuit of any severe weather phenomenon, regardless of motive, but most commonly for curiosity, adventure, scientific investigation, or for news or media coverage. A person who chases storms is known as a storm chaser or simply a chaser.
This article lists various tornado records. The most "extreme" tornado in recorded history was the Tri-State tornado, which spread through parts of Missouri, Illinois, and Indiana on March 18, 1925. It is considered an F5 on the Fujita Scale, even though tornadoes were not ranked on any scale at the time. It holds records for longest path length at 219 miles (352 km), longest duration at about 3+1⁄2 hours, and it held the fastest forward speed for a significant tornado at 73 mph (117 km/h) anywhere on Earth until 2021. In addition, it is the deadliest single tornado in United States history with 695 fatalities. It was also the third most costly tornado in history at the time, but has been surpassed by several others when non-normalized. When costs are normalized for wealth and inflation, it still ranks third today.
The Late-May 1998 tornado outbreak and derecho was a historic tornado outbreak and derecho that began on the afternoon of May 30 and extended throughout May 31, 1998, across a large portion of the northern half of the United States and southern Ontario from southeastern Montana east and southeastward to the Atlantic Ocean. The initial tornado outbreak, including the devastating Spencer tornado, hit southeast South Dakota on the evening of May 30. The Spencer tornado was the most destructive and the second-deadliest tornado in South Dakota history. A total of 13 people were killed; 7 by tornadoes and 6 by the derecho. Over two million people lost electrical power, some for up to 10 days.
Timothy Patrick Marshall is an American structural and forensic engineer as well as meteorologist, concentrating on damage analysis, particularly that from wind and other weather phenomena. He is also a pioneering storm chaser and was editor of Storm Track magazine.
Doppler on Wheels is a fleet of X-band and C-band radar mobile and quickly-deployable truck-borne radars which are the core instrumentation of the Flexible Array of Radars and Mesonets affiliated with the University of Illinois and led by Joshua Wurman, with the funding partially provided by the National Science Foundation (NSF). The DOW fleet and its associated Mobile Mesonets and deployable weather stations Doppler on Wheels (DOW) has been deploying in hazardous/challenging weather, driving into the eye of the storm to gather scientific data about wind, rain and snow that are missed by stationary radar systems. They are part of the NSF's "Community Instruments and Facilities" (CIF) program.
Joshua Michael Aaron Ryder Wurman is an American atmospheric scientist and inventor noted for tornado, tropical cyclone, and weather radar research, the invention of DOW and bistatic radar multiple-Doppler networks.
Storm Chasers is an American documentary reality television series that premiered on October 17, 2007, on the Discovery Channel. Produced by Original Media, the program follows several teams of storm chasers as they attempt to intercept tornadoes in Tornado Alley in the United States. The show was canceled at the end of its 5th season by Discovery Communications on January 21, 2012.
Tornadoes are more common in the United States than in any other country or state. The United States receives more than 1,200 tornadoes annually—four times the amount seen in Europe. Violent tornadoes—those rated EF4 or EF5 on the Enhanced Fujita Scale—occur more often in the United States than in any other country.
The Verification of the Origins of Rotation in Tornadoes Experiment are field experiments that study tornadoes. VORTEX1 was the first time scientists completely researched the entire evolution of a tornado with an array of instrumentation, enabling a greater understanding of the processes involved with tornadogenesis. A violent tornado near Union City, Oklahoma was documented in its entirety by chasers of the Tornado Intercept Project (TIP) in 1973. Their visual observations led to advancement in understanding of tornado structure and life cycles.
Tony Laubach is an American storm chaser and meteorologist. He has participated in several field research projects and is one of the surviving members of TWISTEX. He has been contracted as a severe weather photojournalist for various major television networks, and has starred in several television shows, including Seasons 3 through 5 of Storm Chasers on the Discovery Channel.
TWISTEX was a tornado research experiment that was founded and led by Tim Samaras of Bennett, Colorado, US, that ended in the deaths of three researchers in the 2013 El Reno tornado. The experiment announced in 2015 that there were some plans for future operations, but no additional information has been announced since.
Dr. Reed Timmer is an American meteorologist and storm chaser. He is known for starring in the Discovery Channel reality television series Storm Chasers, as well as in the documentary film Tornado Glory and in the series Tornado Chasers. He also worked with Mike Theiss in the reality television series Storms Rising on Disney+.
Sean Cameron Casey is an American IMAX filmmaker and storm chaser who appeared in the Discovery Channel reality television series Storm Chasers. Casey created an IMAX film called Tornado Alley about chasing tornadoes and had to build the Tornado Intercept Vehicle (TIV) and the Tornado Intercept Vehicle 2 (TIV2) to film inside a tornado. Tornado Alley was released worldwide on March 18, 2011. Casey has been named one of the 50 best minds of 2008 by Discover Magazine.
The SRV Dominator is the name given to a series of vehicles used for Reed Timmer, as featured on the Discovery Channel series Storm Chasers. In April 2013, Timmer, designer and operator of all three Dominator vehicles, joined KFOR-TV's 4WARN Storm Team, all three vehicles collectively referred to by the station as "Dominator 4".
David K. Hoadley is an American pioneer of storm chasing and the first widely recognized storm chaser, as well as the founder and former editor of Storm Track magazine. He is also a sketch artist and photographer.
A prolonged and widespread tornado outbreak sequence affected a large portion of the United States in late-May 2013 and early-June 2013. The outbreak was the result of a slow-moving but powerful storm system that produced several strong tornadoes across the Great Plains states, especially in Kansas and Oklahoma. Other strong tornadoes caused severe damage in Nebraska, Missouri, Illinois, and Michigan. The outbreak extended as far east as Upstate New York. 27 fatalities were reported in total, with nine resulting from tornadoes.
Timothy Michael Samaras was an American engineer and storm chaser best known for his field research on tornadoes and time on the Discovery Channel show Storm Chasers. He died in the 2013 El Reno tornado.
During the early evening of Friday, May 31, 2013, an extremely large and powerful tornado occurred over rural areas of Central Oklahoma. This rain-wrapped, multiple-vortex tornado was the widest tornado ever recorded and was part of a larger weather system that produced dozens of tornadoes over the preceding days. The tornado initially touched down at 6:03 p.m. Central Daylight Time (2303 UTC) about 8.3 miles (13.4 km) west-southwest of El Reno, rapidly growing in size and becoming more violent as it tracked through central portions of Canadian County. Remaining over mostly open terrain, the tornado did not impact many structures; however, measurements from mobile weather radars revealed extreme winds up to 135.0 m/s within the vortex. These are among the highest observed wind speeds on Earth, just slightly lower than the wind speeds of the 1999 Bridge Creek–Moore tornado. As it crossed U.S. 81, it had grown to a record-breaking width of 2.6 miles (4.2 km), beating the previous width record set in 2004. Turning northeastward, the tornado soon weakened. Upon crossing Interstate 40, the tornado dissipated around 6:43 p.m. CDT (2343 UTC), after tracking for 16.2 miles (26.1 km), it avoided affecting the more densely populated areas near and within the Oklahoma City metropolitan area.
Tornado Chasers is an American documentary series that premiered on September 19, 2012, on TVNweather.com. The program follows Reed Timmer and his team of storm chasers as they attempt to intercept tornadoes in Tornado Alley in the United States and Canada. Season 2, funded largely through a successful Kickstarter campaign, commenced on September 30, 2013. The series is a two-time Webby Award Honoree, once for Best Documentary Series in 2013, and again for Best Editing in 2014.
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