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A warm front is a density discontinuity located at the leading edge of a homogeneous warm air mass, and is typically located on the equator-facing edge of an isotherm gradient. Warm fronts lie within broader troughs of low pressure than cold fronts, and move more slowly than the cold fronts which usually follow because cold air is denser and less easy to remove from the Earth's surface. This also forces temperature differences across warm fronts to be broader in scale.
Clouds ahead of the warm front are mostly stratiform, and rainfall defiantly increases as the front approaches. Fog can also occur preceding a warm frontal passage. Clearing and warming is usually rapid after frontal passage. If the warm air mass is unstable, thunderstorms may be embedded among the stratiform clouds ahead of the front, and after frontal passage thundershowers may continue. On weather maps, the surface location of a warm front is marked with a red line of semicircles pointing in the direction of travel.

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  1. A

    Why is my newish boiler useless at providing warm water?

    About 5 year ago, I had a new central heating system (radiators) installed to replace my old warm air underfloor system. The warm air side of the new system is okay but we cannot get any hot water without running a bucketfull of cold water first. This means having to wash your hands in cold...
  2. D

    Downstairs radiators only get warm when i turn off upstairs radiators

    Hi. Turned my heating on for the 1st time today, i bled every radiator as haven't done it since last winter. upstairs worked fine but an hour or 2 later I noticed downstairs was still cold. I looked for some advice online and turned the trv's off and locksheilds for the upstairs only and...
  3. H

    Shower Not Getting Hot (gets warm, but unlike the taps in the room)

    Ive troubleshooted it being the anti scold needs adjusting, however I have taken everything off the faucet to as much as I can. I have no idea how I get past where ive got to, any ideas?
  4. M

    Additional radiator not warm

    Hi all I’ve got a radiator in our conservatory which appears to have been piggybacked off the plumbing from the living room rad on the floor directly above it. It was like this when we moved in, I know it’s not building regs but oh well. The problem is it’s the only one not getting hot since...
  5. E

    Rad not geting warm but no air in rad

    Hi I have conected a small rad with 15mm pipe fed from 10mm system there is no air in the read water is coming out no bubbles but rad don't get warm the rad its conected to dos get hot the 15mm pipes have to go up and over a small door and back down to the new rad what am I doing rong please
  6. X

    Bathroom Only Has Warm Water

    Hi all So I live in flat with communal heating/hot water and so have a HIU in the flat. I had a problem where nowhere in flat was getting hot water only warm and company that services the HIU came and replaced a valve in the HIU. Then I was getting hot water in kitchen but not in the bathroom...
  7. S

    Hiu hot water issue- only warm water not hot

    I am working in a flat that only has luke warm hot water. I replaced the PM valve which seemed to fix the problem a month later ot has returned. I have cleaned the heat exchanger and ther dosnt seem to be a blockage. I have checked the thermostatic control valve all seems fine. When I flush the...
  8. 2

    Rad not heating up. Warm water through both valves.

    I have a house with 15 rads in it. In a bedroom upstairs I have a rad that isn't heating up. This rad was moved about 5 years ago with 1/2inch plastic pipe to new location in the same room but was never turned on. Tonight I tried to blead it but then removed the rad, emptied it and when off...
  9. DJseals

    Upstairs rads only warm

    My rads upstairs in bedrooms today only getting warm. The bathroom and ensuite are not used but when trouble shooting today they got red hot when on. Downstairs rads all get hot very quickly, and hot water works. But rooms only warm. 1 bedroom was cold. I understand balancing a system, but that...
  10. B

    Hot radiator return pipes but warm flow pipes

    Although my CH radiators are hot to touch eventually, I have noticed that one in the downstairs sitting room and probably one of the last to get really hot, has a warm flow pipe and a very hot return pipe. The same applies to some of my other radiators but not all. Is this a balancing issue...
  11. S

    Central Heating taking two hours to warm up

    Hello, I'm not a plumber, and may get some of the terminology wrong in this post, please don't shoot me down for it. Since moving in to our home several years ago, we've had issues with the performance of our central heating. In winter, the living room can take up to two hours to get upto 18C...
  12. S

    Radiators only luke warm if hot water is on

    Radiators are only getting luke warm if hot water is on but boiling hot if hot water is turned off. It’s either hot water, warm radiators or warm radiators hot water cavy seem to enjoy both anymore. We had the system professionally power flushed in Feb this year so what could the problem be...
  13. C

    Aged Care Warm Water Systems

    how can I do minimise the risks associated with warm water system? thanks guys!
  14. C

    Warm Water System

    What's the best warm water you use and is there any risks associated with them?
  15. O

    One radiator always on, boiler and boiler room always warm!

    My apologies as this question has probably been asked loads of times. We moved into a new house in Jan which has an oil boiler, the room that houses the boiler is always warm, sometimes like an oven. The radiator that's directly above where the boiler is is always on, mainly warm but sometimes...
  16. S

    Should the pipe from the top of the Water Cylinder be hot rather than warm

    Hi all, I have a Megaflo Heatrae Sadia running from a conventionla boiler. The boiler is 12 months old, the cylinder about 6 years old. The cylinder has two separate pipes in at the bottom left, both of which are too hot to hold for more than a second. There is a stone cold pipe going in the...
  17. B

    Radiator still warm when switched off

    Hi all, newbe here. Just replaced a o ring on the ideal isar he30 boiler diverter valve manifold and all went great but now the boiler displays 0 on the panel but the radiators are still getting warm when switched off. Has anyone got any ideas what is going on, cheers,
  18. T

    Mystery luke warm water from bath

    Morning everyone, Hope someone can help with an issue ive had 3 times now on seperate occasions. Changed some bath taps in 2 different properties, one had the telephone style bath/shower deck mixer installed, boiler was a worcs greenstar 30i combi. Changed for an ideal deck bath deck taps...
  19. S

    BAxi duo tec he 24 - water only luke warm

    Hi. Hoping you can help. I attempted to top up the pressure but turned the wrong levers. My hot water is now only Luke warm. If I turn the tap on less the half the water gets hot. This is no good for having a shower. Please can you tell Me how to solve this? I have insurance but they can’t come...
  20. K

    Didnt like having to AR warm air unit!

    Had to switch off an old fellas heating today as he had no fixed ventilation for warm air unit, tried to argue the benefits of letting him use it but was bashed with the letter of the 'law' by gassafe advisor. I totally get the point but when does it become ok (no a requirement) to leave an 80+...
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