Current Conditions
Temp2.8 C
RH84 %
WindNE 12 mph
RoadClosed
Latest Summit Road Surface Observations

LocationDate - TimeConditionGrip Surface TempAir Temp
UKIRTSeptember 21, 2019 - 1020 HSTDryGood 22.8 oC4.4 oC
Haukea PassCLEAR - (hazardous conditions last reported on Sep 20, 2019 @ 22:27:03 HST)
Upper Switch BackNot Operable
Summit Road Surface Observations Trend and UKIRT Web Cam

Latest Lens Code

Received optical signal is low enough that lens could be "Soiled" if condition continues for a long time. Note that a 4 reading is normal in adverse weather conditions.
Raw UKIRT Road Surface Observations

Date HST xvalue yvalue ratio airtmpc sfctmpc ave cond
code
cur cond
code
ave fric
code
cur fric
code
soiled
lens
grip
20190921 10:20:42 1769 1724 1.026 4.4 22.8 DRY DRY 0.80 0.80 4 GOOD
20190921 10:19:42 1762 1717 1.026 4.4 22.2 DRY DRY 0.80 0.80 4 GOOD
20190921 10:18:41 1775 1720 1.032 4.4 22.2 DRY DRY 0.80 0.80 4 GOOD
20190921 10:17:42 1769 1724 1.026 4.0 20.6 DRY DRY 0.80 0.80 4 GOOD
20190921 10:16:42 1773 1725 1.028 4.0 21.1 DRY DRY 0.80 0.80 4 GOOD
Ice Detector Network Road Surface Observations

Haukea Pass
Date HST xvalue yvalue ratio airtmpc sfctmpc ave cond
code
cur cond
code
ave fric
code
cur fric
code
soiled
lens
grip RH
20190920 22:27:03 1977 1857 1.064 1.65 4.81 DRY DRY 0.82 0.82 0 GOOD 85.49
20190920 22:26:03 1977 1795 1.101 1.63 4.79 DRY DRY 0.82 0.82 4 GOOD 85.38
20190920 22:25:03 1973 1781 1.108 1.65 4.81 DRY DRY 0.70 0.82 4 GOOD 86.42
20190920 22:24:03 1976 1726 1.144 1.65 4.89 DRY DRY 0.70 0.70 4 GOOD 86.29
20190920 22:23:03 1971 1664 1.184 1.63 4.91 DRY DRY 0.70 0.70 4 GOOD 85.96
Disclaimer

The road surface condition detector cannot determine the road surface condition when there is fog. However, if the temperature is near freezing and fog is present, road ice is highly likely.

The road surface condition detector only looks at a one foot diameter area of asphalt located on the summit ridge adjacent to the United Kingdom Infra-Red Telescope. As Mauna Kea has many micro-climates, the detector may indicate the road is clear while hazardous conditions exist in other locations.