Mauna Kea Weather Center Archive Forecast Page

MKWC archive forecast page
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Please select a year and month and links of all available forecasts for that period will be given in the 'Select Forecast' menu.


Selection:	2004	02	Feb 29 2004 (morning)

Mauna Kea Forecast Latest Forecast for Mauna Kea Observatories
830 AM HST (1830 UTC) Sunday 29 February 2004 (THIS IS AN OLD FORECAST)

Warnings
Extensive fog, ice, and high humidity.
Chance for thunderstorms and snow.

Tonight's Cloud Cover and Precipitation Forecast
Although the summit appears relatively clear at the moment (at least from Hilo), humidity is not expected to drop below 80% for another 36 to possibly 72 hours. In fact, the entire atmosphere is projected to become completely saturated for tonight. In addition to that, the atmosphere near the Islands will remain very unstable through the next 24-48 hours. As a result, extensive fog and ice is expected for tonight. There is also a very good chance for more light snow over the next 24 hours and isolated thunderstorms, particularly this afternoon and tomorrow afternoon. Snowfall could be heavy in the event of any developing and/or passing thunderstorms. Cloud cover will also be very extensive as more mid-level clouds develop near or move in from the west during the night.
Summary of Key Meteorological Variables
See table below or graphical trend.

Discussion
No discussion today.
Astronomical Observing Quality Guidance
Vertical Profiles from MM5 (vertical coordinate is pressure in mb):

Tonight's (Sunday Night) Collage NOT AVAILABLE

Saturday Night's Collage (available after 0800 HST on Saturday) Seeing Cn2

Sunday Night's Collage (available after 0800 HST on Sunday) Seeing Cn2

Graphical Summary

5-day Forecast
Summary
Graphical Trend 02 pm HST
Sun 29 Feb 08 pm HST
Sun 29 Feb 02 am HST
Mon 01 Mar 02 pm HST
Mon 01 Mar 08 pm HST
Mon 01 Mar 02 am HST
Tue 02 Mar 02 pm HST
Tue 02 Mar 08 pm HST
Tue 02 Mar 02 am HST
Wed 03 Mar 02 pm HST
Wed 03 Mar 02 am HST
Thu 04 Mar 02 pm HST
Thu 04 Mar 02 am HST
Fri 05 Mar

00 UTC
Mon 01 Mar 06 UTC
Mon 01 Mar 12 UTC
Mon 01 Mar 00 UTC
Tue 02 Mar 06 UTC
Tue 02 Mar 12 UTC
Tue 02 Mar 00 UTC
Wed 03 Mar 06 UTC
Wed 03 Mar 12 UTC
Wed 03 Mar 00 UTC
Thu 04 Mar 12 UTC
Thu 04 Mar 00 UTC
Fri 05 Mar 12 UTC
Fri 05 Mar

Cloud Cover (%) 60 to 80 70 to 90 70 to 90 40 to 60 20 to 40 10 to 30 20 to 40 40 to 60 60 to 80 70 to 90 70 to 90 70 to 90 70 to 90

Chance for Fog/Precip (%) 100/90 100/90 100/90 90/75 75/50 75/25 75/25 75/25 75/25 50/25 25/0 0/0 0/0

PW (mm, summit upward) 4 to 6 4 to 6 6 to 8 6 to 8 4 to 6 4 to 6 4 to 6 4 to 6 4 to 6 4 to 6 3 to 5 3 to 5 3 to 5

Summit Temp (^oC) -2 -4 -5 -1 -2 -3 2 0 -1 4 0 5 1

Wind Dir/Speed (mph)
    Summit (615 hPa)
    19,000 ft (500 hPa)
    24,500 ft (400 hPa)
    31,000 ft (300 hPa)
    35,000 ft (250 hPa)
    40,000 ft (200 hPa)
    46,000 ft (150 hPa)
    54,000 ft (100 hPa)

S/30 to 45
SSE/35
SSE/43
SE/42
SE/30
ENE/25
NNE/41
NNE/27

S/20 to 35
S/28
SSE/38
ESE/16
E/17
NNE/25
N/49
NE/20

S/15 to 30
S/26
SSE/27
NNE/6
NNE/12
NNW/32
N/38
NE/15

SSW/15 to 30
WSW/13
WNW/27
W/27
W/19
WNW/28
NW/25
ENE/9

SW/15 to 30
WSW/16
WSW/21
WSW/32
W/32
WNW/39
WNW/30
NE/1

SW/10 to 20
SW/19
SW/24
WSW/40
W/44
W/44
W/29
WSW/4

S/10 to 20
SSW/17
SSW/25
SW/40
WSW/51
WSW/54
WSW/37
SW/10

S/10 to 20
SSW/14
SSW/25
SW/39
SW/50
WSW/56
WSW/40
SSW/15

SSE/10 to 20
S/12
SSW/22
SW/43
SW/53
WSW/57
SW/44
SW/21

SE/10 to 20
SE/8
SSW/27
SW/37
SW/45
SW/57
SW/53
SW/20

SE/10 to 20
SSE/17
SW/17
WSW/38
SW/49
SW/56
SW/59
WSW/19

ESE/10 to 20
SSW/8
SSW/13
WSW/38
WSW/54
WSW/61
WSW/55
SW/22

ESE/10 to 20
SSE/8
SSW/17
WSW/34
WSW/44
WSW/56
WSW/62
WSW/24

Rise and Set times for the Sun and Moon

Night (HST) Sun Set Twilight End Twilight Beg Sun Rise Moon Rise Moon Set Illum (%) RA Dec

Sun.Feb.29/Mon.Mar.01 18:36 19:40 5:28 6:32 N/A 3:10 70 6 23.2 27 16

Mon.Mar.01/Tue.Mar.02 18:36 19:41 5:27 6:31 N/A 4:00 79 7 18.0 26 46

Tue.Mar.02/Wed.Mar.03 18:37 19:41 5:26 6:31 N/A 4:48 86 8 12.8 24 56

Wed.Mar.03/Thu.Mar.04 18:37 19:41 5:26 6:30 N/A 5:32 92 9 06.8 21 47

Thu.Mar.04/Fri.Mar.05 18:37 19:41 5:25 6:29 16:36 6:13 97 9 59.5 17 28

Forecast issued by: Ryan Lyman
rlyman@hawaii.edu - (808) 932-2323
For public road conditions and snow report message please call (808) 935-6268.

Next update at 10 AM HST (2000 UTC) Monday 1 March 2004.
Please call or email to be placed on the Mauna Kea Weather Bulletin email list.

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This page was last modified on: Wed, Apr 22 2009 - 2058 UTC
Send comments to: Ryan Lyman