Above: Map of the Detwiler Fire. The blue line was the perimeter at 10 p.m. PDT July 18. The dots represent heat detected by a satellite, with the red ones being the most recent, from 1:30 p.m. PDT July 19, 2017.
(Originally published at 4:32 p.m. PDT July 19, 2017)
A satellite that overflew the Detwiler Fire at 1:30 p.m. PDT on Wednesday detected heat sources that, if accurate, indicate that in the previous 15 hours since the last fixed wing aircraft mapping flight, the fire spread significantly to the north toward Coulterville and to the south east of Catheys Valley. There was also expansion on the east side, but very little on the west.
The data from this satellite hundreds of miles overhead is not nearly as sensitive and accurate as a dedicated fixed wing mapping aircraft, so this information should be considered tentative until the next conventional mapping flight which will probably occur Wednesday night. The sensors only pick up large heat sources. If it does turn out to be accurate, we’re looking at more than 60,000 acres.
The growth toward the north is consistent with the satellite photograph taken Wednesday afternoon, which shows dense smoke being pushed north.
![Detwiler Fire NASA satellite photograph](https://wildfiretoday.com/wp-content/uploads/2017/07/SatPhotoWedPM.jpg)
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