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How many days in the future do extended forecasts become useless?

Posted on 2/3/14 at 4:08 pm
Posted by bpfergu
Member since Jun 2011
3485 posts
Posted on 2/3/14 at 4:08 pm
Trying to plan an upcoming trip that starts in 11 days and how the weather is will govern a few plans.

They have those 15 day extended forecasts but can you really take any prediction past a week or so out with any confidence?
Posted by LNCHBOX
70448
Member since Jun 2009
84535 posts
Posted on 2/3/14 at 4:09 pm to
2
Posted by barry
Location, Location, Location
Member since Aug 2006
50382 posts
Posted on 2/3/14 at 4:09 pm to
quote:

They have those 15 day extended forecasts but can you really take any prediction past a week or so out with any confidence?



Anything past a day or two is unreliable
Posted by NYCAuburn
TD Platinum Membership/SECr Sheriff
Member since Feb 2011
57002 posts
Posted on 2/3/14 at 4:10 pm to
really its about 2-5, the extended are good at judging what might happen, but during the winter can change rapidly
Posted by Adam4848
LA
Member since Apr 2006
19065 posts
Posted on 2/3/14 at 4:10 pm to
Anything past 15 min
Posted by Jim Rockford
Member since May 2011
98734 posts
Posted on 2/3/14 at 4:14 pm to
Within reason, it's useful. Look at the pattern, not the forecast for a specific day.
Posted by Brian Wilson
Member since Mar 2012
2036 posts
Posted on 2/3/14 at 4:29 pm to
1
Posted by iliveinabox
in a box
Member since Aug 2011
24115 posts
Posted on 2/3/14 at 4:31 pm to
like 3-4..
Posted by The Last Coco
On the water
Member since Mar 2009
6842 posts
Posted on 2/3/14 at 4:33 pm to
After 2-3 days, they give a general idea of what may happen in the 48-72 hr period surrounding a day, but little in planning a morning or afternoon event.
Posted by brewhan davey
Audubon Place
Member since Sep 2010
32831 posts
Posted on 2/3/14 at 4:47 pm to
The last couple of weeks have taught me that anything beyond a day or two is to be taken with a grain of salt.
Posted by TH03
Mogadishu
Member since Dec 2008
171114 posts
Posted on 2/3/14 at 4:58 pm to
1-2
Posted by Pettifogger
Capitol Hill Autonomous Zone
Member since Feb 2012
79525 posts
Posted on 2/3/14 at 5:39 pm to
1-2 for any accuracy, 3-4 for general ideas (likely to rain/not to rain/relative temp ranges).

You can assess lows and fronts a few days out, but for what they'll actually bring, beyond 48 is unreliable.

5+ day forecasts are largely worthless, I think. I'm pretty sure that in the 10-15 day they're either guessing or just using historical averages.
Posted by Tigris
Mexican Home
Member since Jul 2005
12448 posts
Posted on 2/3/14 at 6:10 pm to
What do you want to know? Temperature? If so then 11 days out the forecast may be slightly better than a random guess. For precipitation it's not worthless.

For temperature it starts getting decent at about a week out. For precip. maybe around 4 days.
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