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.
Plaincast decodes the National Weather Service's Area Forecast Discussion — the real forecast, written 3 to 4 times a day by the meteorologist on shift — into plain English. The discussion is where a forecaster explains their reasoning: which models disagree, what they are watching, and how confident they are. Below is the current edition for Tucson, with its shorthand expanded. The full experience — an AI plain-English summary beside the annotated original — loads with JavaScript, and every one of the 68 forecast offices has its own edition.
Isolated to scattered afternoon and early evening thunderstorms through Monday, then reduced storm chances through much of the remainder of the work week. Strong, gusty winds and locally heavy rainfall will be possible with any thunderstorm. High temperatures will remain well above normal through the week with an Extreme Heat Warning in effect for much of southeast Arizona.
The Gulf Surge continues this hour with breezy S/SW winds across the lower deserts west of Tucson. TDs have eclipse 70 degrees in far western Pima County with with low to mid 60s for portions of Pima County (west of Tucson) and Santa Cruz. Across the metro, TDs are in the 50s to lower 60s. This will set the stage for a rather robust T'storm day. The question will be where and the intensity. Looking over the most current MesoA and CAMs, point to areas across western and central Pima and Santa Cruz Cos. One or more clusters, potentially forming into a N/NW moving MCS is possible. Main threats will be strong gusty winds to 60 mph, especially across central Pima Co where the HREF has a 10% probable of gusts in excess of 58 mph. Secondary threat will be a localized flash flood threat where heavier rainfall rates are realized and any backbuilding/cell mergers in the deeper moisture from the gulf surge.
For the Tucson Metro, coverage will be more isolated in nature. Any convection will evolve off the higher terrain and/or outflow boundary interaction likely from storms south and/or southwest of the City. Coverage is even less further east where drier air resides.
The Monsoon still looks to a downturn with much of the region dry through most of the work week. Best opportunity (10-30%) daily will be along the International Border and the White mountains. By Friday, there could be an expansion in coverage for most of SEAZ to see at least isolated activity.
Heat remains front and center through the week, with widespread Major Heatrisk with areas of Extreme. The Extreme Heat Warning remains in effect through Saturday evening, with most of Santa Cruz and Cochise Cos starting Tuesday.
This is the plain-text edition, decoded without AI so it loads anywhere. Read the whole Tucson discussion at /o/TWC/, see what changed since the last one, or open The National Desk for where the weather is today.