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Kitt Peak Nightly LTO Report For UT: 2026-08-22

Report Time (MST): 08:58                    For access to all LTO-Reports go to: http://www-kpno.kpno.noirlab.edu/cgi-bin/ltoreport

4 Meter Weather Averages
From: UT = 01:00 (MST=6:00 PM) To: UT = 13:00 (MST=6:00 AM)

Elements	Mean	High	Low	AvDev
Air Temperature (°C)	24.1	25.1	21.5	0.4
Dewpoint Temperature (°C)	6.6	9.3	4.1	1.1
Relative humidity (%)	33	44	26	2.7
Wind Speed (mph)	14.5	40.9	3.7	3.3
Wind Direction (°)	27	116	8	0.6
4M Dome Temperature (°C)	-99.9	-99.9	-99.9	0.0
4M Dome Dewpoint (°C)	8.7	9.8	8.2	0.4
4M Primary Mirror (°C)	21.2	21.2	21.2	0.0

Weather Comments:	Thunderstorms to begin with some rain, mostly cloudy the rest of the night. Wind averaged 15mph and humidity averaged 33%.
Recognized Hours:	( 8.5 )      18 degree twilight + 0.5 hr.

Observer Information

Telescope	Observer	Prop. #	Instrument	Detector	Seeing
4 Meter	No Observer	---	---	N/A	N/A
WIYN	No Observer	2026B-300000	N/A	N/A	N/A
2.1 Meter	No Observer	---	---	N/A	N/A
Feed	No Observer	---	N/A	N/A	N/A
0.9 Meter	No Observer	---	---	N/A	N/A

Time Usage During The Night

Telescope	Hours Used	Night's Activity		Hours Lost	Time Lost Due To:	Time of Night (MST)
4Meter
	8.5	Shutdown		0	Weather
WIYN
	8.5	Shutdown		0	Weather
2Meter
	8.5	Shutdown		0	Weather
Feed
	0	Scientific Research		0	Weather
W0_9m
	8.5	Shutdown		0	Weather

Observing Status

4 Meter	DESI is in Summer Shutdown. Would have been able to observe for about 6.5 hours, with about 2 hours lost to weather.
WIYN	NEID is in Summer Shutdown. Would have been able to observe for about 6.5 hours, with about 2 hours lost to weather.
2.1 Meter	Not Scheduled
Feed	Not Scheduled
0.9 Meter	Not Scheduled

Comments	Thunderstorms to start with scattered rain, dark clouds continued to roll over until the early hours where there was a break in the clouds for ~2 hours that clouded back over after.

Reported by:	Vince Tucker

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