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TheForecast Post

A chronicle of American weather and climate  ·  Wednesday, 16 September 2026

Weather Trader Notebook MILEPOST 584

April 23, 2025 Wednesday Weather Update

Continued convective showers east of the Rockies

What the month did

April 2025 was the 16th-warmest April in the 132-year national record (1895–2026), at 53.6°F against a 1991–2020 normal of 51.8°F (+1.7°F).

April 2025 was the 31st-wettest April in the 132-year national record (1895–2026), at 2.9in against a 1991–2020 normal of 2.7in (+0.2in).

NOAA/NCEI Climate at a Glance, contiguous United States. This is the observed record for the month, not a score of anything said in this piece — the forecast ledger begins 2026-08-17 and cannot reach earlier posts.

After about 20-years of making weather maps an old way [GrADS], I’m in the process of adapting code and scripts to be more Google Maps oriented but with some tricks up my sleeve to increase the quality and customization. The main issue with web Mercator is not being latitude and longitude based but on tiles zoomed at various local, regional and global scales. Raw weather model data is processed in latitude and longitude space (EPSG 4326) and you cannot warp the web maps to latitude and longitude without losing the quality of the map because it become distorted. So, we need to go the other direction and assemble the maps with web Mercator. I’m not aware of a sturdy, operational workflow or business that provides this, so we’ll be on the ground floor of something new and cool. The end result will be more broadcast TV style mapping and pre-rendered output that should be eye-popping.

For subscribers

The rest of this piece is for paid subscribers of Weather Trader. The Post keeps the archive, the index and the record; the writing itself stays behind the same subscription it was published under.

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Milepost
584 · laid 2025-04-24T00:30:35.713000Z
Source
https://weather.substack.com/p/april-23-2025-wednesday-weather-update
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ee46571041624fb1abfdb4df5b03d6010a2180d761a66c365360f8cff230e4e4
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