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.

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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.

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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.

Flagstaff NWS Forecast in Plain English

Area Forecast Discussion · National Weather Service Flagstaff (FGZ) · issued Wednesday, August 12 at 1:44 PM MST.

Synopsis

An active monsoon pattern extends across northern Arizona with scattered to numerous showers and thunderstorms developing across the region. The main threat will be flash flooding, but gusty winds and hail will be possible with the strongest storms. A Flash Flood Watch remains in effect through this evening. Monsoon conditions are expected to continue Thursday, with a downtrend in Monsoon activity possible by the weekend, as drier air moves into the region.

Discussion

Plenty of Monsoon moisture extends across northern Arizona as the high pressure system as moved eastward into the southern plains and southerly flow and transported moisture northward. Right now a trough at 850 mb is supporting the showers and thunderstorms in northwestern Arizona, with showers and thunderstorms also developing along the rim and higher terrain down to the White Mountains. The UA WRF model shows this active pattern continuing through 6 PM MST/7PM MDT, and then decreasing as the potential area of development shifts southward. However, due to the north-northeast storm motion, it is possible for rain to move into areas near and south of I-40 overnight and early Thursday morning. The UA WRF model also shows and active monsoon pattern for Thursday afternoon and evening, though the 12 and 15Z runs show a slight decrease in overall coverage. The Flash Flood Watch may need to be extended into Thursday if shower and thunderstorm coverage is still expected to be extensive enough to warrant a watch.

A mid-level trough is currently sitting off of the west coast and will attempt to move inland. This could bring drier, mid-level area over northern Arizona and reduce shower and thunderstorm activity across the region. However, if this trough fails to move inland or moves farther north, then the active monsoon pattern may continue into the weekend. Right now forecast trends does support the trough moving inland and an overall decrease in monsoon activity this weekend, but these trends will be monitored.

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