What is an Area Forecast Discussion (AFD)?

An Area Forecast Discussion is a detailed narrative forecast written 3-4 times daily by National Weather Service meteorologists. Unlike weather apps that show icons and numbers, AFDs explain the reasoning behind the forecast - why models disagree, what forecasters are watching, and where uncertainty exists.

How does Plaincast translate NWS forecasts?

Plaincast uses Anthropic's Claude AI to summarize each forecast section into natural, readable prose. It also annotates the original text with a 230+ term jargon glossary, converts Zulu (UTC) times to local time zones, and highlights key information for quick scanning.

Which NWS offices does Plaincast support?

Plaincast supports 68 NWS forecast offices across all US regions including Los Angeles (LOX), New York (OKX), Chicago (LOT), Houston (HGX), Phoenix (PSR), San Francisco (MTR), Miami (MFL), Seattle (SEW), Denver (BOU), and many more.

Yes, Plaincast is completely free and open source. It uses the NWS public API for forecast data and Anthropic's Claude for AI summaries. No account or API key required.

How often are forecasts updated?

NWS meteorologists issue new Area Forecast Discussions 3-4 times per day, typically around 4 AM, 10 AM, 4 PM, and 10 PM local time. Plaincast automatically fetches the latest discussion when you load the page.

Birmingham NWS Forecast in Plain English

What is an Area Forecast Discussion?

Area Forecast Discussions are the real forecasts, written 3 to 4 times daily by NWS meteorologists reading the models and interpreting what they mean for your area. They offer far deeper insight than any weather app, but they're written in dense meteorological shorthand. Plaincast uses Anthropic's Claude to summarize them into plain English, side by side with the annotated original.

Area Forecast Discussion · National Weather Service Birmingham (BMX) · issued Monday, July 27 at 1:30 PM CDT.

Revised in 8 passages since the 7:02 AM discussion. See every revision.

Messages

Heat: Dangerous heat indices of 105 to 109 degrees are expected Tuesday for all of Central Alabama. A Heat Advisory is in effect.

Severe Wednesday: There is a 1, out of 5 marginal risk for severe thunderstorms across the southeast counties of Central Alabama Wednesday afternoon and evening. The main threats are damaging straight-line winds and large hail.

Discussion

(This afternoon through Sunday) Issued at 129 PM CDT MON JUL 27 2026

Upper-level ridging shifts east through the work week, setting the stage for significant heat risk. Tuesday stands out as the hottest and most oppressive day, with highs reaching the upper 90s to near 100 degrees. Combined with dew points in the mid- to upper 70s, heat indices will approach 110. A Heat Advisory has been issued, beginning this afternoon for western areas and expanding area-wide through Tuesday. While the MCS train persists, the primary track appears to remain east of our area on Tuesday, limiting rain chances. However, rounds of showers and storms remain possible as shortwave energy rotates along the ridge's periphery. By mid-week, the ridge suppresses as a trough builds over the East Coast and a deep low develops over New England. This pattern change will allow for a gradual cooldown, with highs trending into the upper 80s and low 90s by Friday.

This is the plain-text edition, decoded without AI so it loads anywhere. The full Plaincast experience — plain-English summaries beside the annotated original, with the forecast changelog — loads automatically with JavaScript, or open the interactive edition.