So what’s the weather going to be on Thanksgiving?

This year people are more attuned to the weather – for good reason. Given COVID19, gatherings outdoors are far safer than inside, so the weather is a bigger factor than usual. I’m getting a lot more questions like “what’s the weather going to be like next St. Swizzen’s Day” – be it for a holiday, wedding, birthday gathering, protest march, golf game, or whatever. My usual reply is “I study disasters; if I can tell you then you probably don’t want to know” doesn’t make people happy 😛 Of course I’ve got the tools here to do pretty much any kind of forecast from “nowcasts” to climate, but how does the average person answer that question without annoying their favorite scientist/blogger? Which provider is best? As it turns out, that’s an easy question to answer. Your tax dollars have funded a really great organization, the US National Weather Service, and they have some nice on-line tools for planning your holiday. Virtually all the other providers – be it big companies, TV stations, whatever, are using NWS data and perhaps “adding value” (although in most cases I’d argue they are adding FUD, but that’s a different post). So lets walk through using the NWS web site to see what tools are available, and if you can hold that Thanksgiving gathering outside, or if everyone will have to stay home and use video …

The starting place is https://www.weather.gov. Here’s what the main page looks like. Any warnings will be color coded:

The map is clickable … click on the location you’re interested in; it doesn’t have to be perfect, you’ll get the chance to refine it. But for your home location, enter the place name you want in the box on the left. You can use a zip code or place name – for example, you can enter “Ardsley Park, Savannah, GA” and the system will give you matching names …

If you click “remember me” then whenever you go to weather.gov your local forecast will pop up on the left side. Clicking “Get detailed information” and you will jump to the point location forecast … here’s where you can really get into seeing what is going on:

The page itself is a nice overview, but if I’ve got family coming over at 4pm Thursday, with dinner at 6pm, and people will probably start to go home at 8pm. How likely is it that we can eat outside at the picnic table, or will I have to set up tables all over the house inside, or just cancel? Jackets, build a fire in the fire pit, or Savannah being Savannah will we need bug spray? If you scroll down and look under the map on the right there is a box called “additional resources” …

Click the graph and you get the hourly forecast data.

You can change the date to see up to a week in the future; in this case let’s set the start point at 12am (midnight) on Thursday. Click submit and you get:

So for Ardsley Park area in Savannah, the temperature should be 70 degrees, light wind, 31% Cloud Cover. The precip chance is 18% – but if you look at the graph, it never gets above 20%, and drops to only 8% by 7pm, so chances are this is not a sharp rain producing weather system. Now that you’ve tagged this as your “remember me” location any time you to to weather.gov on that device it will have your forecast on the main page – and you can easily get the very detailed details!

But what if you are travelling? Just click on the national map … it will take you to the forecast for that point. In this case, as noted on the first map I directly clicked on Andrews NC, then got the “additional details” to see the timing and intensity of any rain:

Looks like rain overnight Wednesday (80% chance at midnight!) and perhaps Thanksgiving morning, but will clear out and be nice overnight, with rain maybe coming back Friday night (back up to 30% chance) .

When planning an event, obviously the closer in time the better the forecast. By the time we’re within three days they are pretty good; 3 to 5 days are fair, over five days takes some interpretation. I’ll try to do some more posts on that in the future, but hopefully this will get you started …

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