EGLL - Hottest day ever

[Fright Level]

EGLL 101350Z 20012KT CAVOK 37/06 Q1015 NOSIG

The BBC are reporting 37.4C, just waiting for the next ATIS to show 38. Loving every minute of it, back to the pool!

Now 37.9 but ATIS still saying 37, I guess William Hill have bribed them to avoid paying out on their bets!

[CarltonBrowne the FO]

I may be exercising a little too much caution here, but if the temperature is between two numbers, wouldn't it be safer (in performance calculations) for the ATIS to round UP instead of rounding down? :)

[chocolate bob]

37.9 now recorded at LHR

Ladbrokes have just announced that they are now paying out on the hottest day in the UK since records began.

Make a nice change on all accounts (Hot weather and bookies losing!)

[Robert Vesco]

Just waiting for all the green eco-activists to start crying again about ´global warming´ and point the finger to aviation saying it´s all our fault. :E

[ferris]

Hopefully the temperature might fall to 37.9 here, tonight.:rolleyes:

[newarksmells]

When I lived in Scottsdale, AZ, it got down to a low of 98 one night. The previous day was 118. I actually got up at 1:30am and swept in the pool for an hour...and I had Air-Conditioning too..

Newark

[Kalium Chloride]

EGLL officially ousted from #1 temperature spot after Gravesend recorded 38.1C

Sorry, LHR...yer record's been nicked by a sweaty Kent.

[A Very Civil Pilot]

When they record the ATIS temp, presumably it is from a thermometer in a shaded screen to give the true shade temperature. Do ops. manual figures take this into account when working out reduced thrust, RTOW etc when the temp over a big lump of black tarmac in the sun is, on a day like yesterday, going to be much higher?

[Pelican]

Good point. I have been wondering about that myself many a time. I wonder how much hotter the air that is sucked into the engines actually is on such heat soaked runway.

[MasterCaution]

Good point. I have been wondering about that myself many a time. I wonder how much hotter the air that is sucked into the engines actually is on such heat soaked runway.

Presumably the air moves around sufficiently to mix air warmed conductively from a hot runway with (cooler) air in the immediate vicinity thereby equalising the local air temperature. Even with zero wind I would have thought the convective effects (air in contact with the runway gets warmed, rises and sucks in air from around it) would go some way to mixing the air (let alone jet blast and wake stirring it all up). I suppose the specific heat capacity of air, the difference in temperature between the local air and the runway surface and the magnitude of wind (or other air movement) would all play a part.

MC.

[Mariner9]

The Jet A-1 in storage must have been getting pretty close to it's flashpoint (38 min) :eek:

[Jordan D]

They use a thermometer in a Stevensen (sp) Screen device 1.25m off the ground to measure the temp ... it allows for shade, whilst there is constant air flow.

Jordan

[Runaway Gun]

Mariner. I doubt that they store the Jet A-1 out in the sun. It's pretty cool since they bought the fuel cells their own fans. ;)