Archives For November 2014

2014-11-28_07-39-39

A dedicated team of students from Reigate Grammar School weather station successfully launched a high altitude balloon (HAB) and retrieved the payload on Tuesday 25 November 2014.   After months of meticulous planning and with close cooperation and assistance from the scientists at the Met Office, Met Research Unit, Cardington Boundary Layer Research Facility and in collaboration with Chris Hillcox Near Space Photography, our students launched the 800g balloon and then used GPS trackers to chase and locate the payload as it fell to earth after an extraordinary 3.5 hour flight collecting some of the best amateur high altitude balloon photos of near space.  The students and staff were delighted by the success of their mission which took careful planning and preparation to reduce the risk of failure, which always remained a possibility.  The balloon took 2 hours to ascend 100,000 feet (30km) into the stratosphere, through temperatures as low as -70C in the tropopause, before the balloon burst at pressures 100x lower than at the surface.  The descent took over an hour.  Videos of the story can be found below.  See below also for “Why did we do this?”

Planning

Students spent weeks prior to the launch designing and building a lightweight box (150g) that would carry the payload safely to an incredible altitude up to 30km into the atmosphere.  The payload consisted of several HD cameras, spot GPS trackers and a GSM locator with meteorology sensors which were weighed to ensure the balloon would be able to lift them to the target burst height at 30km (100,000 feet) with 3.5m cu of helium.  All equipment was thoroughly tested (several times).  GPS trackers were tested to ensure phones would pick up the track reliably.  A laptop was enabled to operate on a mobile connection.  GoPro cameras were tested and checked, as were HTC cameras.  A school logo was laser cut onto a small plastic arm that would sit in front of one of the cameras during the ascent.  CAA approval was applied for and received.  Scientists at the Met Office research unit were also closely consulted regarding gas type (99.5% helium, not party grade!) and the practicalities of the launch location such as trees and masts.  Risk-benefit assessments based on MetOffice launch assessments were completed and approved. Various risks needed to be considered beyond allergies to latex and the dangers of helium inhalation,  particularly regarding student involvement in retrieval that might require travel across land that lacked nearby public access.  We checked and adjusted school insurance to ensure full coverage for the flight.  However, in the end, it was the good will and enthusiasm shown by the individuals involved with the student launch that drew the threads together and allowed us to proceed with this unique educational challenge.  Acknowledgements are listed below.

Predicting the right weather 

To avoid the balloon payload shooting off across the North Sea we had to choose a day when the jetstream and higher altitude winds in the stratosphere were relatively slack.  Winds in different directions with height would also be useful to ensure the balloon did not travel too far for retrieval purposes.   A single date could therefore not be fixed in advance due to changing autumnal weather conditions.  Parents of students were sent an open letter with details regarding the potential for this expedition and ways we would contact them to ensure students were available as any possible launch date approached.  The weather at all altitudes was studied carefully and a potential launch date emerged for Tuesday 25 November as a weak high pressure pushed the jetstream and high altitude winds further north.  A suitably safe landing site was also critical to mission success and the HABHUB website landing predictor was regularly consulted in the run up to the launch.  Conditions improved throughout the period until Tuesday looked the most ideal.  We were GO FOR LAUNCH!

 The launch

The launch day started early as the team had to travel well beyond the flight paths of Gatwick and Heathrow.  Our launch site was in Bedfordshire with a predicted landing site NE of Cambridge.

Amanda Kerr-Munslow, a Met Office Boundary Layer Research Scientist, gave the group a very interesting tour of the site, including lasers that measured cloud height.  Dave Bamber the Met office facilities manager then helped students inflate the balloon.  The payload box had last minute modifications completed and was then prepared and carried to the launch bed.  The balloon was carefully transferred, inflated, to attach to the payload at the launch site.  Cables checked, final preparation and then the countdown!  The pictures below show some screenshots captured by the movie cameras on the ascent to 100,000 feet.

short film: (FULL FILM scroll below)

(please refresh the page if video is from another playlist)

Payload retrieval

The chase and retrieval were very exciting!  Despite predictive forecasts showing a broadly good landing area (open farmland, flat, few forests, rural, few pylons etc) it was not certain that it would avoid landing in problem locations like hedges or trees, pylons, main roads, rivers, ditches, inaccessible fields remote from a road or someone’s roof!  It was an exciting moment for the team when the tracks stopped at Wicken Fen in Cambridgeshire and the maps appeared to show a landing site in an open field which appeared to be accessible from the road.  Reflective vests on and trackers in hand we rushed off to search and found the payload with the shredded remains of the burst parachute precisely on target.   A wonderfully memorable moment after an exciting and highly rewarding adventurous day for everyone involved.

Why did we do this?

It has been a long-term aim of the RGS weather station to launch a HAB.  Reasons are myriad but the experience of this has been a high quality challenging learning and teamwork experience for students and staff. Practical skills, meteorology and an understanding of the atmosphere were all critical for students to grasp to increase the chances of a successful launch and, importantly, retrieval.  The students more than rose to the challenge!  At RGS the sky is not the limit!

A driving force behind this enterprise has been to raise climate and weather awareness amongst students and more widely.  The images and story brought back beautifully illustrate the fragile atmosphere in which we all live and upon which the human race depends.  From our balloon view the atmosphere was shown as a thin blue veil of gases held precariously against the surface with the blackness of space directly above and not far away.  It is of course widely accepted that humans are forcing climate change which might potentially threaten our existence because we have altered the workings of the delicate atmospheric envelope.  The site and sound of planes cruising far below our balloon demonstrated how we might dominate a tiny hospitable part of the planet but that we reside perilously close to utterly hostile environments.  In this respect it is no surprise that we have probably damaged this delicate life-protecting atmosphere with our activities.  We would like anyone using our pictures to ensure that climate change is explicitly mentioned and that our balloon launch post is linked to any material used.

What next?

This project has proved that the stratosphere is closer than ever and increasingly accessible. School exploration of the stratosphere is now within the budget of schools or groups of schools that can collaborate (rather timely considering recent political announcements).  Currently it costs around £200 to launch a payload to 30km, to launch a further 30km above that would cost £200 million (Antares rocket cost)!  The exploration and science that schools can do at 30km is breathtaking! Floating balloons are also possible for longer experiments.  The IPCC consider that our climate is on the cusp of irretrievable change that will have great impacts in the next 100 years.  It is therefore of the utmost importance that schools engage their students with weather and climate and that exam syllabuses include meteorology and climate across a variety of disciplines.

costing the earth: different missions

This video of the flight has been edited from 6 hours of footage from 3 cameras pointing in different directions (GoPro Hero3, 2 HTCs) over the course of the 3.5 hour flight.  It also includes screenshots and photos showing the story of how students put their payload into near space.

(please refresh the page if video is from another playlist)

11 video questions for classes: (ask “why” / “how” for extension)

  1. Why is the flight path not straight?
  2. At what height do clouds stop?
  3. It rains ice particles from blue sky at some points in the flight.  Why might this happen?
  4. Does all rain that falls out of a cloud reach the ground?
  5. Are any clouds man-made?
  6. Listen to the wind and noise picked up by on-board camera mics during the flight: how does it change?
  7. How does the colour of the sky change with altitude?
  8. How “near space” actually is 100,000 feet (30km)?
  9. Which was the coldest part of the ascent?
  10. As the balloon burst there was a puff of “smoke”, what was this?
  11. Shreds of burst balloon were seemingly left hanging above the descending payload.  What do you think happened to these?

RGS launch team:

  • Piers Rex-Murray
  • Tom Tatham
  • Jasmine Hull
  • Louis Chambers
  • Edgar Povey
  • George Beglan
  • Harry Persand
  • Chris Meredith
  • Fraser Cadman
  • Matt Taylor

RGS staff:

  • Simon Collins
  • Peter Klein
  • Vanessa Ramsden

Acknowledgements and sincere thanks to the following:

Huge sincere thanks to the following for helping us to get our HAB project off the ground.

  • Near Space Photography : Chris Hillcox Chris was incredibly helpful in giving students ownership of their launch in all stages whilst offering any amount of technical know-how we needed to increase chances of success. Chris gave his time extremely generously throughout the enterprise and his expertise was pivotal in the success of the mission.  Many thanks Chris!
  • Royal Meteorology Society RMetS : especially Sylvia Knight who encouraged us to pursue the project and put us in touch with Amanda. Thank you Sylvia!
  • Met Office, Met Research Unit, Cardington : Boundary Layer Research FacilityDavid Bamber and Amanda Kerr-Munslow were on the launch site at Cardington.  Amanda gave us a thorough tour of the scientific research unit and assisted with all practical aspects of getting it organised at Cardington.  David was a hero for staying up all night on an IOP and then staying on to manage students in inflating the balloon.  Many thanks Amanda and David.
  • RGS DT department: thanks to DT department for their workshop space and the free use of their tools and being so patient when we left polystyrene all over the place.  Thanks to Martin especially for helping us with the lazer logo cutting.

Interested in a HAB launch or weather stations for schools?  Contact RGSweather!

short video version

news:

http://www.surreymirror.co.uk/Reigate-school-sends-weather-balloon-near-space/story-25116859-detail/story.html?ito=email_newsletter_surreymirror

October 2014 rain and temperature

October 2014 rain and temperature

sunshine hours October 2014

sunshine hours October 2014

Reigate weather summary for October 2014

Tmax 22.6C

Tmin 2.4C

Taverage 13.1C

Total rainfall 112.3mm (CoCoRahs)

Despite memories of big storms like St Jude last year, October 2014 has turned out more than twice as wet with 112.3mm.  For the UK as a whole October 2014 was a warm month and broke records with the warmest “Halloween” on record.  At an average of 13.1C it was warm in Reigate as well, but oddly did not exceed the 2013 average of 14C. So 2014 was wetter but not quite as warm in Reigate as last year.  It was a quieter month with lower wind speeds and less widespread stormy conditions and it looks like Autumn 2014 will continue in this mild wet style but without the threat of big trains of countless Atlantic storms like last year.  Blocking HIGHS over Russia / Scandinavia and to the North look set to slow down the train of Atlantic weather and send it south into the Mediterranean where wet and stormy conditions have already been experienced (“Medicane” Mediterranean hurricane November Malta 2014)

In the UK as a whole October 2014 was the equal-tenth warmest October for the UK in a series since 1910 according to Central England temperatures (CET).  Globally, unconfirmed data suggests that October might be the warmest on record.

In Reigate much of the heaviest rain came in the first half of October in big convective downpours that were hit and miss.  Some tornadoes were reported across the UK and these were quite damaging in places further North.  We have yet to record a tornado in Reigate.  Tornados are extremely tricky to forecast but several agencies try it.. usually the MetOffice do not mention tornadoes in their forecasts because they are so hit and miss, even when potential is there.  Estofex, UKWW and SkywarnUK are agencies that have an eye on tornadic and severe weather conditions in the UK that RGSweather follows carefully.

MetOffice winter prediction 2014-15 as follows: It states “For November-December-January above-average UK-mean temperatures are more likely than below-average” and “Latest predictions for UK-mean precipitation favour near- or above-average rainfall for November-December-January”.  In contrast, other weather agencies and some seasonal model predictions are suggesting the possibility of a colder winter as various early indicators seem to suggest the possibility of incursions of cold air at times.  In particular, early October extensive Siberian snow cover, cooler than average temps over Siberia and a negative OPI index leading to an amplified jetstream (which seems to be occuring now) seem to suggest the possibility cold blasts at times this winter.  In addition, an Easterly phase of the Quasi-Biennial Oscillation (QBO) in the stratosphere favours a weaker flow of upper westerly winds that shut out cold air for the UK and W Europe.  An easterly QBO phase favours colder winters for us, but not always.  Whilst a strong El Nino has not transpired, there are indications that sea surface temperatures in the Pacific (especially central Pacific) are rising, albeit modestly: El Nino tends to link with cooler Euro winters.  These immediate measurable indicators correlating more or less with cold UK winters are interesting but not necessarily enough on their own to drive the atmopshere toward cold conditions.  They might, however, couple with other connections in the Stratosphere to cause stratospheric warming which, some weeks after, can cause downwelling of cold air into the troposphere and further disruption of the westerly flowing jetstream.  This is especially the case if warming is sudden (SST).  IF this all happens and IF surface pressure patterns play ball then the UK could see some cold snowy conditions! Charts below show some of these connections: