From 41f9430d37ea65906d0d770fee648eba867e2078 Mon Sep 17 00:00:00 2001
From: Tanner Collin <git@tannercollin.com>
Date: Sat, 14 Feb 2026 16:45:57 -0700
Subject: [PATCH] fix: Correct CYVR typo, improve visibility parsing, and
 handle unknown components

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
---
 metar.html | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/metar.html b/metar.html
index 2839ef0..0db4e3e 100644
--- a/metar.html
+++ b/metar.html
@@ -64,7 +64,7 @@
             if (code === 'CYYC') return "CYYC: Calgary International Airport";
             if (code === 'CYEG') return "CYEG: Edmonton International Airport";
             if (code === 'CYXS') return "CYXS: Prince George Airport";
-            if (code === 'CYVR') return "CVYR: Vancouver International Airport";
+            if (code === 'CYVR') return "CYVR: Vancouver International Airport";
             if (code === 'CYBW') return "CYBW: Calgary/Springbank Airport";
             console.log(`Unknown Airport code: ${code} in METAR: ${metarString}`);
             return `${code}: Unknown Airport`;
@@ -559,10 +559,18 @@
             const mainParts = rmkIndex !== -1 ? parts.slice(index, rmkIndex) : parts.slice(index);
             
             // Intermediate sections
-            mainParts.forEach(part => {
+            for (let i = 0; i < mainParts.length; i++) {
+                let part = mainParts[i];
+
+                // Check for mixed fraction visibility, e.g., "1 1/2SM" which is split into "1" and "1/2SM"
+                if (part.match(/^\d+$/) && (i + 1) < mainParts.length && mainParts[i+1].match(/^\d\/\dSM$/)) {
+                    part = `${part} ${mainParts[i+1]}`;
+                    i++; // Consume next part
+                }
+
                 if (part.endsWith('KT')) {
                     sections.push({ raw: part, decoded: decodeWind(part) });
-                } else if (part.endsWith('SM') || part.match(/^\d+$/) || part.match(/^\d\/\dSM$/)) {
+                } else if (part.endsWith('SM') || part.match(/^\d+$/)) {
                     sections.push({ raw: part, decoded: decodeVisibility(part) });
                 } else if (part.match(/^([+-]|VC)?(MI|PR|BC|DR|BL|SH|TS|FZ|DZ|RA|SN|SG|IC|PL|GR|GS|UP|BR|FG|FU|VA|DU|SA|HZ|PY|PO|SQ|FC|SS|DS|TR)+$/)) {
                     sections.push({ raw: part, decoded: decodeWeather(part, metarString) });
@@ -572,8 +580,11 @@
                     sections.push({ raw: part, decoded: decodeTempDew(part) });
                 } else if (part.startsWith('A') && part.length === 5 && !isNaN(part.substring(1))) {
                     sections.push({ raw: part, decoded: decodeAltimeter(part) });
+                } else {
+                    console.log(`Unknown main METAR part: ${part} in METAR: ${metarString}`);
+                    sections.push({ raw: part, decoded: `${part}: Unknown METAR component` });
                 }
-            });
+            }
 
             // Remarks section
             if (rmkIndex !== -1) {