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And technically, it means it MIGHT BE freezing out... since 32 is freezing - unless you live in a pressure vessel or somewhere with salty rain, then it's a little lower...
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I'm Paul, The car is Blimey--- BlimeyCabrio's Blog--- 2006 MCSCa w/lotsa mods and Union Jacks
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The "Ding" threshold is 37 degrees. If it's 37 or lower when you start the car, it dings and flashes. If you're motoring and the temp is dropping, it will ding and flash when it drops to 37.
I think the concern is that if it's 37F when you start driving (let's say, when you get up in the AM), then the odds are fair that it was colder than that sometime in the not too distant past... and maybe it was cold enough THEN for the bridges and overpasses to freeze... and maybe they're still frozen...
But they don't start freezing at anything over 32F.
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I'm Paul, The car is Blimey--- BlimeyCabrio's Blog--- 2006 MCSCa w/lotsa mods and Union Jacks
Ten-time Dragon Veteran - Occasional Trackrat - Extreme Twisty Addict - Rhymers Ferry Road Fanatic
I think it probably has more to do with the variablity of temps in the area. If it's 37 at my house it may be 32 down at the bottom of the hill, or over across the river. The temp guage isn't instant, so it's just there to let you know "look out". Around here you sneeze and the weather goes from 80 to 30. :D
I do think that 37 is a tad high. My truck flashes at 34. Maybe it's the whole celcius to farenheit translation. LOL:D
I think the concern is that if it's 37F when you start driving (let's say, when you get up in the AM), then the odds are fair that it was colder than that sometime in the not too distant past... and maybe it was cold enough THEN for the bridges and overpasses to freeze... and maybe they're still frozen...
Not quite but close. Its more like while it may be 37 degrees at your house, there are many microclimates, especially is something is North facing. For example, one side of my house faces South ... no frost in the morning, but the other side faces north and its definitely colder and frost on the ground.
It is for bridges and overpasses depending upon microclimates. It might be 32 degrees. An excellent example is here I95 seems to be, literally, the crossover line between rain and snow. Head east and it warms up (closer to the water). Crossover I95 west and you can actually see the temp drop several degrees and snow start. Its like watching it rain on one side of the street and no rain on the other side. Kinda freaky
You "Southerners" and "Westerners" gotta remember to factor in wind chills. When the wind is blowing up here on the North Coast, the bridges can freeze at 37 degrees.
Heck I was driving home this afternoon and I think the tempo gauge was at about 35, but it was snowing.
(Did I mention that living in Ohio SUCKS... We have yet to get into the (sustained) nice weather. We have about 2 inches of snow on the ground right now.)
It's April. I won't hear the ding until December unless I run low on fuel...
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You "Southerners" and "Westerners" gotta remember to factor in wind chills. When the wind is blowing up here on the North Coast, the bridges can freeze at 37 degrees.
Heck I was driving home this afternoon and I think the tempo gauge was at about 35, but it was snowing.
(Did I mention that living in Ohio SUCKS... We have yet to get into the (sustained) nice weather. We have about 2 inches of snow on the ground right now.)
Wind chill only has an effect on things that "produce heat". If the ambient temperature is 37° at the bridge and there is a 100mph wind, the bridge is still 37°.
However, if a person is lashed down to that same bridge, it will "feel" like it would on a -10° day, because the heat energy will be pulled away from their body in a relative fashion.
By the way, the air temp drops something like 1° every 1000 feet. So, it can be 37° on the ground, but sub 32° at cloud level...therefore, snowing / freezing rain.
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