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		<title>explain xkcd - User contributions [en]</title>
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		<updated>2026-04-16T23:37:03Z</updated>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:3065:_Square_Units&amp;diff=369569</id>
		<title>Talk:3065: Square Units</title>
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				<updated>2025-03-20T12:48:50Z</updated>
		
		<summary type="html">&lt;p&gt;172.69.109.92: &lt;/p&gt;
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I like this one :) reminds me of trying to use recipes in imperial units with metric equipment [[Special:Contributions/162.158.108.29|162.158.108.29]] 19:48, 19 March 2025 (UTC)&lt;br /&gt;
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I so want to stand outside Randall's office holding up {{tl|citation needed}} for not giving an actual citation on the title text. [[Special:Contributions/162.158.175.159|162.158.175.159]] 20:07, 19 March 2025 (UTC)&lt;br /&gt;
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We should start using ares as a common unit of measure. https://www.britannica.com/science/are [[Special:Contributions/172.69.135.15|172.69.135.15]] 20:09, 19 March 2025 (UTC)&lt;br /&gt;
:We have done, some still do: {{w|Hectare#Are}} [[Special:Contributions/172.70.163.70|172.70.163.70]] 21:20, 19 March 2025 (UTC)&lt;br /&gt;
:I really hate when people use &amp;quot;metric ton&amp;quot; instead of the correct megagram (Mg). [[User:SDSpivey|SDSpivey]] ([[User talk:SDSpivey|talk]]) 12:28, 20 March 2025 (UTC)&lt;br /&gt;
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The area of eaten vegetation is all well and good, but we really need to know the total volume consumed. In barn-megaparsecs, ideally. [[Special:Contributions/172.71.241.89|172.71.241.89]] 21:26, 19 March 2025 (UTC)&lt;br /&gt;
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I just got the mail notification for this and the previous comic at the same time. I would say that Randall forgot to send out the previous one before, but surely this is automated, so I guess something went wrong with that setup. [[User:Fabian42|Fabian42]] ([[User talk:Fabian42|talk]]) 00:01, 20 March 2025 (UTC)&lt;br /&gt;
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I really want to know what the 80-fold error was now [[User:Thief|Thief]] ([[User talk:Thief|talk]]) 10:54, 20 March 2025 (UTC)&lt;br /&gt;
: Here's an error in chemical names instead--Diphenhydramine (Benadryl) occasionally appears as diphenhydrazine, which (if it existed) might be a rocket fuel. Google for it, just for scientific fun. Rocket flight to Australia, now in your local pharmacy! [[Special:Contributions/172.69.71.207|172.69.71.207]] 11:38, 20 March 2025 (UTC)&lt;br /&gt;
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The land area of Australia really depends on when it last rained. There are very large areas that will be completely dry prior to rain that will be flooded after. [[User:SDSpivey|SDSpivey]] ([[User talk:SDSpivey|talk]]) 12:28, 20 March 2025 (UTC)&lt;br /&gt;
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You should never write `square cm`, etc. but always `cm²`. Same for seemingly standard abbreviations: Don't write `ccm` for &amp;quot;cubic centimeter&amp;quot;, but `cm³`. Even though, in spoken language &amp;quot;square centimeter&amp;quot; is correct. Another confusion can sometimes arise from not knowing that squaring or cubing binds less than the centi-/kilo-/... prefix. I.e., `cm³` is `(0.01m)³` not `0.01(m³)`. A liter (`l`) is `0.001m³` or `1dm³ = (0.1m)³`. A milliliter is `0.001l = 0.000001m³ = (0.01m)³ = 1cm³` --[[Special:Contributions/172.69.109.92|172.69.109.92]] 12:48, 20 March 2025 (UTC)&lt;/div&gt;</summary>
		<author><name>172.69.109.92</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=Talk:3024:_METAR&amp;diff=359577</id>
		<title>Talk:3024: METAR</title>
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				<updated>2024-12-16T14:55:32Z</updated>
		
		<summary type="html">&lt;p&gt;172.69.109.92: &lt;/p&gt;
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OMG RANDALL ADDED AN AO3 REFERENCE '''[[User:42.book.addict|&amp;lt;span style=&amp;quot;font-family:Cormorant Garamond;font-size:9pt;color:#A9C6CA&amp;quot;&amp;gt;42.book.addict&amp;lt;/span&amp;gt;]]&amp;lt;sup&amp;gt;[[User talk:42.book.addict|&amp;lt;span style=&amp;quot;font-family:Cormorant Garamond;font-size:6pt;color:#516874&amp;quot;&amp;gt;Talk to me!&amp;lt;/span&amp;gt;]]&amp;lt;/sup&amp;gt;''' 19:43, 13 December 2024 (UTC)&lt;br /&gt;
:must've been reading the fic of bill [[User:CalibansCreations|'''&amp;lt;span style=&amp;quot;color:#ff0000;&amp;quot;&amp;gt;Caliban&amp;lt;/span&amp;gt;''']] ([[User talk:CalibansCreations|talk]]) 21:04, 13 December 2024 (UTC)&lt;br /&gt;
I love the things I learn from these things[[User:Rustykid52|Rustykid52]] ([[User talk:Rustykid52|talk]]) 19:48, 13 December 2024 (UTC)&lt;br /&gt;
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Was the explanation of wind speed written by a European? The punctuation after &amp;quot;18&amp;quot; is a comma, not a period, so they it means over 18 thousand knots. [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 19:59, 13 December 2024 (UTC)&lt;br /&gt;
: Yes, it was. I'm sorry. [[User:Janfred|Janfred]] ([[User talk:Janfred|talk]])&lt;br /&gt;
: If windspeed interpreted at &amp;quot;european style&amp;quot;, i.e. 18 and 35/1000 knots, it s still funny, beacouse such precision of wind speed measurement is 1] unreachable (variability at space &amp;amp; time is several horders higher), 2] useless (fraction of knot make no difference for pilots). ([[HonzaM])&lt;br /&gt;
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&amp;quot;38.08 inches of mercury&amp;quot; seems a very high pressure, even for a station that is well below sea level. (1290 hPa Pressure around the dead sea is typically 1060hPa)..  Is that physically realistic, or is it part of the joke?  I know funnel clouds, freezing and volcanic ash in the same location are unlikely outside of the apocalypse, but can be justified by the rule of funny. [[Special:Contributions/172.70.160.135|172.70.160.135]] 20:11, 13 December 2024 (UTC)&lt;br /&gt;
:Indeed, 31.80 is the reference high limit. Still, is Randall a pilot? The structure of a METAR is horribly familiar to us pilots but pretty much a blank stare to anyone else. [[Special:Contributions/172.68.245.25|172.68.245.25]] 21:03, 13 December 2024 (UTC)&lt;br /&gt;
:Feeding it into a [https://www.weather.gov/epz/wxcalc_pressurealtitude calculator] gives an altitude of -2080m (-6825'). So it's entirely reasonable as long as your weather station is in a deep mine. [[User:BunsenH|BunsenH]] ([[User talk:BunsenH|talk]]) 21:08, 13 December 2024 (UTC)&lt;br /&gt;
:: But isn't the value always put in reference to MSL? I.e. I'm at an airport at 1000ft, the pressure reads 977 hPa, but I'll put 1013 hPa in the METAR. (QNH in METAR vs QFE at the station) [[User:Janfred|Janfred]] ([[User talk:Janfred|talk]]) 21:14, 13 December 2024 (UTC)&lt;br /&gt;
::: There may be various complicated pressure differences from the tornado having dumped a load of possibly Iclandic pyroclastic tephra upon the station. [[Special:Contributions/141.101.98.181|141.101.98.181]] 21:36, 13 December 2024 (UTC)&lt;br /&gt;
:&amp;quot;outside of the apocalypse&amp;quot; - we are talking about NYC :P [[Special:Contributions/172.69.64.171|172.69.64.171]] 00:04, 14 December 2024 (UTC)&lt;br /&gt;
:: With a Bostonian leading the discussion &amp;amp;#128121; [[Special:Contributions/162.158.42.157|162.158.42.157]] 16:51, 14 December 2024 (UTC)&lt;br /&gt;
:The difference between the altimeter setting and the SLP is also pretty concerning. My understanding (which is based only on a few minutes of googling, not any actual experience) is that one does not correct for temperature while the other does, based on a 12 hour average. So maybe the high value is due to crazy temperatures? Haven't done any calculations, but it would fit the apocalyptic scenario. [[Special:Contributions/172.70.247.9|172.70.247.9]] 08:40, 14 December 2024 (UTC)&lt;br /&gt;
::That sounds about right for the weather station {{w|Belvedere Castle|located}} at the ZIP code [[1245: 10-Day Forecast|-10021]]... [[Special:Contributions/172.70.91.11|172.70.91.11]] 09:37, 14 December 2024 (UTC)&lt;br /&gt;
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Damn, Randall says you got No Bitches.[[User:Xurkitree10|Xurkitree10]] ([[User talk:Xurkitree10|talk]]) 06:20, 14 December 2024 (UTC)&lt;br /&gt;
:Alright, who here on this wiki lacks significant others? (I personally have zero (0) maidens) [[User:CalibansCreations|'''&amp;lt;span style=&amp;quot;color:#ff0000;&amp;quot;&amp;gt;Caliban&amp;lt;/span&amp;gt;''']] ([[User talk:CalibansCreations|talk]]) 19:51, 15 December 2024 (UTC)&lt;br /&gt;
:By &amp;quot;observer&amp;quot;, the report means the person who's observed the weather and/or data and created the report, not the person who's observing the report or the comic page. [[User:BunsenH|BunsenH]] ([[User talk:BunsenH|talk]]) 20:42, 15 December 2024 (UTC)&lt;br /&gt;
llama-3.1-405b-instruct (poor context, likely contains mistakes):&lt;br /&gt;
&amp;lt;blockquote&amp;gt;&lt;br /&gt;
New York, Central Park: 25th of the month, 16:00 UTC (11:00 am local time): Wind from the south at 35 knots (about 40 mph), with gusts up to 45 knots (about 52 mph): 6 statute miles visibility: In the vicinity, a funnel cloud and freezing volcanic ash: Heavy blue precipitation: No significant change in weather expected: Lightning overhead: Altimeter at 38.08 inches of mercury (about 1022.8 hPa): Precipitation discriminator present: Sea-level pressure at 1013.0 hPa (30.00 inHg, but note that this value is not explicitly stated in the METAR report, and the 'SPL130' code is not a standard way to report sea-level pressure).&lt;br /&gt;
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...&lt;br /&gt;
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I should have mentioned that the codes &amp;quot;+BLUP&amp;quot; are not standard METAR codes.&lt;br /&gt;
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METAR is specified by the International Civil Aviation Organization (ICAO) in the document &amp;quot;Annex 3 to the Convention on International Civil Aviation: Meteorological Service for International Air Navigation&amp;quot;. This document defines the standard format and codes used in METAR reports.&lt;br /&gt;
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In the United States, the Federal Aviation Administration (FAA) also publishes guidelines for METAR reporting in the document &amp;quot;Aviation Weather Services Advisory Circular&amp;quot; (AC 00-45).&lt;br /&gt;
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The World Meteorological Organization (WMO) also publishes guidelines for METAR reporting in the document &amp;quot;Manual on Codes&amp;quot; (WMO-No. 306).&lt;br /&gt;
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These documents define the standard codes and formats used in METAR reports, but they do not include codes like &amp;quot;+BLUP&amp;quot;, which are likely used in a humorous or fictional context.&lt;br /&gt;
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...&lt;br /&gt;
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With this transcription, I can see that the main difference is in the &amp;quot;SPL&amp;quot; code, which is now transcribed as &amp;quot;SLP&amp;quot;. This makes more sense, as &amp;quot;SLP&amp;quot; is a standard METAR code for &amp;quot;sea-level pressure&amp;quot;.&lt;br /&gt;
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Here's the updated translation:&lt;br /&gt;
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&amp;quot;New York, Central Park: 25th of the month, 16:00 UTC (11:00 am local time): Wind from the south at 35 knots (about 40 mph), with gusts up to 45 knots (about 52 mph): 6 statute miles visibility: In the vicinity, a funnel cloud and freezing volcanic ash: Heavy blowing unknown precipitation: No significant change in weather expected: Lightning overhead: Altimeter at 38.08 inches of mercury (about 1022.8 hPa): Precipitation discriminator present: Sea-level pressure at 1013.0 hPa (30.00 inHg).&amp;quot;&lt;br /&gt;
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...&lt;br /&gt;
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For example, let's imagine a scenario where a massive volcanic eruption has occurred in the vicinity of New York City, causing a massive ash cloud to blanket the area. The eruption is so powerful that it's creating a rare phenomenon known as &amp;quot;{{w|volcanic lightning}},&amp;quot; which is causing the lightning overhead.&lt;br /&gt;
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Meanwhile, the ash cloud is interacting with a severe thunderstorm system, causing the formation of a funnel cloud in the vicinity of Central Park. The winds are so strong that they're blowing the ash and precipitation around, creating a situation where the precipitation discriminator is unable to accurately determine the type of precipitation.&lt;br /&gt;
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In this scenario, the freezing volcanic ash could be a result of the ash cloud interacting with the cold air aloft, causing the ash particles to freeze into small ice crystals.&lt;br /&gt;
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The heavy blowing unknown precipitation could be a result of the intense winds blowing the ash and precipitation around, making it difficult to determine the exact type of precipitation.&lt;br /&gt;
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In this highly unlikely and extreme scenario, the METAR report could be more accurate. However, it's worth noting that even in this scenario, the report is still pushing the limits of what's physically possible in terms of weather phenomena.&lt;br /&gt;
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So, while it's possible to imagine a scenario where the METAR report is more accurate, it's still a highly unlikely and extreme situation that's not representative of typical weather conditions.&lt;br /&gt;
&amp;lt;/blockquote&amp;gt; [[Special:Contributions/172.68.26.24|172.68.26.24]] 01:40, 15 December 2024 (UTC)&lt;br /&gt;
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A 24h-clock is a am-by-default clock. If there is a number of 1-11 it's AM by default. 12-23 tell you it's not am but pm. --[[Special:Contributions/172.69.109.92|172.69.109.92]] 14:55, 16 December 2024 (UTC)&lt;/div&gt;</summary>
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