The rule of thumb I was taught for crosswind component based on difference between runway heading and wind direction was 60º = 6/6 of the crosswind, 30º = 1/2,

The rule of thumb I was taught for crosswind component based on difference between runway heading and wind direction was 60º = 6/6 of the crosswind, 30º = 1/2, 10º = 1/6. So if they're landing on runway 23, 270/28 would amount to (roughly) 4/6 of the wind as a crosswind component, or 19kt.