Current Conditions
Temp3.5 C
RH21 %
WindNNE 19 mph
RoadOpen (4x4)
Latest Summit Road Surface Observations

Date - TimeConditionGrip Surface TempAir Temp
October 17, 2017 - 1801 HSTWetFair 7.2 oC5.4 oC
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 Summit Road Surface Observations

Date HST xvalue yvalue ratio airtmpc sfctmpc ave cond
index
cur cond
index
ave cond
code
cur cond
code
ave fric
index
cur fric
index
ave fric
code
cur fric
code
soiled
lens
grip
20171017 18:01:03 534 987 0.541 5.4 7.2 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:58 532 984 0.541 5.4 6.7 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:53 534 983 0.543 5.4 6.7 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:48 534 983 0.543 5.4 7.2 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:43 532 984 0.541 5.4 6.7 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:38 532 988 0.539 5.4 6.7 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:33 536 987 0.543 5.4 6.7 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:28 535 987 0.542 5.4 6.7 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:23 535 988 0.541 5.4 6.7 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:18 537 984 0.546 5.4 6.7 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:13 537 984 0.546 5.4 6.7 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:08 536 983 0.545 5.4 6.7 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 18:00:03 534 987 0.541 5.4 7.2 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 17:59:58 534 987 0.541 5.4 7.2 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
20171017 17:59:53 535 989 0.541 5.4 7.2 3 3 WT2 WT2 5 5 0.50 0.50 4 FAIR
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.