xmobar: draw the weather icon larger

Add a 13 pt additional font and use it for the weather icon only, so the
rest of the bar and its height are unchanged.

.config/xmobar/weather.sh

@@ -18,7 +18,7 @@ declare -A ICON=(
 report=$(curl -sf --max-time 20 https://tgftp.nws.noaa.gov/data/observations/metar/decoded/"$STATION".TXT)
 temp=$(sed -n 's/^Temperature: .*(\([-0-9.]*\) C).*/\1/p' <<< "$report")
 if [[ -z $temp ]]; then
-    if [[ $1 == notify ]]; then notify-send "Weather" "No report from $STATION"; else echo "${ICON[thermometer]} N/A"; fi
+    if [[ $1 == notify ]]; then notify-send "Weather" "No report from $STATION"; else echo "<fn=1>${ICON[thermometer]}</fn> N/A"; fi
     exit 0
 fi
 
@@ -26,6 +26,8 @@ fi
 wx=$(sed -n 's/^Weather: //p' <<< "$report" | tr ';' '\n' | sed 's/^ *//' | grep -v vicinity)
 wx=${wx,,}
 sky=$(sed -n 's/^Sky conditions: //p' <<< "$report")
+# CAVOK/NSC (no cloud below 5000 ft) have no sky line in the decoded report
+[[ -z $sky ]] && grep -qE '^ob: .* (CAVOK|NSC) ' <<< "$report" && sky=clear
 sky=${sky,,}
 
 # Sun above the horizon (elevation > -0.833°, as for sunrise/sunset) right now, from the low-precision solar position
@@ -76,4 +78,4 @@ if [[ $1 == notify ]]; then
     notify-send "${ICON[$icon]}  Weather" "${desc^}, $temp°C"
     exit 0
 fi
-echo "${ICON[$icon]} <fc=$color>$temp</fc>°C"
+echo "<fn=1>${ICON[$icon]}</fn> <fc=$color>$temp</fc>°C"

.config/xmobar/xmobarrc_hdmi

@@ -1,6 +1,7 @@
 Config { overrideRedirect   = True
        , lowerOnStart       = True
        , font               = "Jetbrains Mono Nerd Font Bold 10"
+       , additionalFonts    = ["Jetbrains Mono Nerd Font Bold 13"]
        , bgColor            = "#24283b"
        , fgColor            = "#737aa2"
        , position           = TopH 24

.config/xmobar/xmobarrc_laptop

@@ -1,6 +1,7 @@
 Config { overrideRedirect   = True
        , lowerOnStart       = True
        , font               = "Jetbrains Mono Nerd Font Bold 10"
+       , additionalFonts    = ["Jetbrains Mono Nerd Font Bold 13"]
        , bgColor            = "#24283b"
        , fgColor            = "#737aa2"
        , position           = TopH 24