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#1
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metar slp reading?
Some metars report a Sea Level Pressu who uses the "slp"
information, and why? |
#2
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metar slp reading?
Paul kgyy wrote:
Some metars report a Sea Level Pressu who uses the "slp" information, and why? Seaplanes/amphibians, aircraft with millibar altimeters, analysis of current pressure gradients vs. "standard" (?) TheSmokingGnu |
#3
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metar slp reading?
SLP reports are the way meteorologists compensate for elevation
differences among the reporting stations; when SLP rather than station pressure is plotted on a synoptic map the high and low pressure centers can be accurately tracked even as they cross mountain ranges. |
#4
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metar slp reading?
On Mon, 05 Nov 2007 14:12:03 -0800, quietguy wrote:
SLP reports are the way meteorologists compensate for elevation differences among the reporting stations; Maybe I'm missing something... Aren't all pressures reported in METARs corrected to sea level? -- Dallas |
#5
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metar slp reading?
On Nov 5, 5:32 pm, Dallas wrote:
Maybe I'm missing something... Aren't all pressures reported in METARs corrected to sea level? In aviation weather observations, yes; in the data coming over the wire to weather forecast offices and data processing centers, station pressures are also reported by WMO-designated synoptic reporting stations. Even though station pressures aren't disseminated to aviators the SLP is marked so there'll be no confusion over what sort of pressure it is. |
#6
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metar slp reading?
On Mon, 05 Nov 2007 16:32:59 -0800, quietguy wrote:
the SLP is marked so there'll be no confusion over what sort of pressure it is. It's nice they endeavor not to confuse us. For instance they code 998.2 hectopascals to SLP982 so they don't confuse anyone. :-) -- Dallas |
#7
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metar slp reading?
Well put!
quietguy wrote: SLP reports are the way meteorologists compensate for elevation differences among the reporting stations; when SLP rather than station pressure is plotted on a synoptic map the high and low pressure centers can be accurately tracked even as they cross mountain ranges. |
#8
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metar slp reading?
Metar's "altimeter" pressure is a value such that if you set your
altimeter to it on the ground, it will show your elevation above MSL. Altimeter's mechanism assumes standard atmosphere where pressure changes with altitude linearly: it doesn't take into account possibly non-standard temperature. SLP, on the other hand, does similar reduction of station's barometric pressure to MSL, but adjusts it for non-standard station temperature. Andrey Paul kgyy wrote: Some metars report a Sea Level Pressu who uses the "slp" information, and why? |
#9
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metar slp reading?
thanks for the good discussion.
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