My first tempo run

Today was 1 mile slow run, 3 miles rather fast for me(~10:50/mile) then another slow mile.  I felt like going really fast at the start, but made myself slow down.  Then, I found the fast part hard to do.  The wind didn't help.  The weather info says 7-8mph winds, but I know there were times when it was much higher than that.  My heart rate got up around 180bpm and stayed there.  A little faster than I like long term.  Not my best run ever, but I can check it off now.  I'm about a third of the way through the 20k training plan., although I kind of skipped the first two runs.