Current Conditions
Temp3.6 C
RH12 %
WindE 8 mph
Mauna Kea Observatories Forecast
12 AM HST (1200 UTC) Saturday 04 July 2015
Cloud Cover and Fog/Precipitation Forecast
The summit will remain dry and stable, but there is a possibility for isolated to scattered thin high clouds in the area through the night.
Summary of Key Meteorological Variables
Summit temperatures will be near 8 C this afternoon and 2.5 C for the night. Winds will be from the NNE at 5-15 mph, with seeing around 0.5-0.6 arcseconds. Precipitable water is expected to be in the 2-3 mm range for the night.
The tradewind inversion will continue to cap low-level moisture near 7 thousand feet and ensure a dry and stable summit-level air mass through at least early Monday afternoon. There is a chance that the inversion will breakdown as tropical moisture and perhaps instability fills in through the area, which will increase the risk for fog and light rain at the summit for next week. Daytime clouds will be minimal and short-lived through Monday, but could turn extensive for Tuesday and Wednesday.

There is a possibility that thin isolated to scattered high clouds will pass over the summit area through most of tonight. These clouds will dissipate and/or shift off toward the SE by late tomorrow morning, leaving predominately clear skies for that evening. However, more thin hihg clouds may start to litter the northern skies as that night progresses. Mostly clear skeis will prevail for most of Monday night, but there is a chance that patchy mid/low-level clouds will build in from the SE early Tuesday morning and may contribute to extensive cloud cover for Tuesday and Wednesday night.

Precipitable water is expected to linger in the 2-3 mm range for tonight, increase to 3-4 mm for tomorrow night and likely will exceed 4 mm for the early part of next week.

Average to slightly better than average seeing will prevail as light/moderate turbulence persists in the atmosphere probably through Monday evening. A gradual influx of mid/low-level turbulence will likely degrade seeing thereafter and eventually contribute to bad seeing for Tuesday and Wednesday night.

No MET discussion today.
WRF Astronomical Observing Quality Guidance
Cloud Cover and Precipitable Water Analyses
MK CN² Profiles
5 Day Forecast Summary (Graphical Trend)
HST Cloud Fog/Precip Temp Wind Seeing PW
Cover (%) Height (km) Probability (%) (Celcius) (Dir/MPH) (Arcseconds) (mm)
Sat Jul 04 - 2 PM0-209.5-100 / 08NNE/5-15NaN2-3
8 PM0-209.5-100 / 02.5NNE/5-150.5-0.62-3
Sun Jul 05 - 2 AM0-209.5-100 / 02.5NNE/5-150.5-0.62-3
2 PM0-20Clear0 / 07.5NNE/5-15NaN3-4
8 PM0-5Clear0 / 02.5NNE/5-150.45-0.553-4
Mon Jul 06 - 2 AM0-209.5-100 / 02.5NNE/5-150.4-0.53-4
2 PM0-20Clear0 / 07.5ENE/5-15NaN3-4
8 PM0-5Clear25 / 102ENE/5-150.4-0.64-6
Tue Jul 07 - 2 AM20-404-550 / 252ESE/5-150.6-0.94-8
2 PM60-804-875 / 505.5SE/0-10NaN4-8
Wed Jul 08 - 2 AM40-604-775 / 402.5SE/0-100.7-1.36-10
2 PM80-1004-890 / 605ESE/5-15NaN8-12
Thu Jul 09 - 2 AM60-804-890 / 752.5ENE/5-150.8-1.66-10
Rise and Set times for the Sun and Moon
Night (HST) Sun Set Twilight End Twilight Beg Sun Rise Moon Rise Moon Set Illumination (%) RA DEC
Sun Jul 05 - Mon Jul 06 19:15 20:28 4:25 5:38 22:11 N/A 76 22 53.1 -5 43
Mon Jul 06 - Tue Jul 07 19:15 20:28 4:25 5:39 22:57 N/A 66 23 48.1 -1 13
Tue Jul 07 - Wed Jul 08 19:15 20:28 4:26 5:39 23:42 N/A 54 0 42.2 3 15
Wed Jul 08 - Thu Jul 09 19:15 20:28 4:26 5:39 0:28 N/A 43 1 36.2 7 28
Thu Jul 09 - Fri Jul 10 19:15 20:28 4:27 5:40 1:14 N/A 32 2 30.4 11 10
Forecast Issued by: Ryan Lyman
Next update at 10 AM HST Monday 06 July (2000 UTC Monday 6 July) 2015.
Additional Information
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