Knee deep snow in #spearfish

co-worker received what appears to be a very weird spearfishing attempt in email. No attachment. No link. Just an email apparently one co-worker to another.
Subject line: Invoice.
Body: "[Coworker1], We have an invoice to pay, and I would like to know if it's possible for you to pay a vendor by check? Thanks, [Coworker2]"
What is the angle? Looks very #spearfish like. Reply would have gone back to Coworker2.

Fifty degrees in two minutes! From -4° to 45° in just two minutes. On #January22nd in 1943. Then plunging from 54° back to -4° that same morning. That's weather in #SouthDakota for ya, which helps explain the #ChildrensBlizzard in 1888. http://rapidcityjournal.com/news/local/degrees-in-minutes-spearfish-library-celebrates-record-breaking-weather-day/article_05e7b793-8ad4-5517-9a10-5a27546a328a.html #Spearfish