Originally Posted by supaphly42
Ugh, crappy brew day. So, aside from my wort sitting in an ice bath for about 4 hours (basement flooding took precedence over beer making), my OG was way off target. My boil was pretty weak, and I ended up with 6 gallons post-boil. Estimated OG was 1.062, measured was 1.046. So, now what? I dumped it in the fermenter and pitched my yeast. How is this going to affect my beer?
When I did my first partial mash recipe, I failed to correct my hydrometer readings for temperature. As you know (and as I knew, but failed to remember!), the apparent reading at higher temperatures needs to be boosted, sometimes substantially, and especially for temperatures over about 120F. See here: http://hbd.org/cgi-bin/recipator/recipator/hydrometer.html
(edit: as you can see, the corrections can be HUGE when you're talking about boiling or mash temperatures. e.g. a measured 1.040 at 150F is actually 1.059, or an almost 50% difference!!!)
If you did adjust, then you'll just wind up with a somewhat weaker beer. But 1.046 is a perfectly respectable OG for a good beer. No worries!