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Almanac & More


Good things to know about typical almamac, air pollutants/pollens, recreational and other data (even astronomical cool notes) from Ken Mitchell, available most days, and brought to you by SeacoastNH.com and its proud sponsors. The more you know, the more you can grow -- or fish, or just have fun, while keeping an eye on your health and safety.

DEW POINTS - HOW IT FEELS

30s and 40s - Nice and dry
Low 50s - Still pleasant
Mid 50s - Pleasant, but noticeably less dry
Upper 50s - Almost muggy
Low 60s - A bit muggy
Mid 60s - Quite muggy
Upper 60s to mid 70s - Awful for most

The little chart above should help you decipher the dew point forecasts and how the dew point values make most people feel, and is mainly for later spring, summer and early fall. This chart assumes daytime temperature-dew point separations. At night, or in storm weather, when those two values are quite close or matching, it will obviously feel quite moist as relative humidities are then near 100%.

 

Tuesday 28 August

ALMANAC, ETC.

PORTSMOUTH NH SUNRISE/SUNSET (MOON DATA, TOO):

Civil Twilight Begins at 5:33 AM.
Sunrise is at 6:03, a 0 hour 58 minute loss over the earliest sunrise of the summer.
Sunset is at 7:25, a 1 hour, 2 minute loss over the earliest sunset of summer.
Civil Twilight Ends at 7:55 PM.
Total Light Loss: 2 hours, 0 minutes. Loss today: 3 minutes.
Sun local noon (sun is due [geographically] south): 12:44 PM.
Total Amount of Daylight: 13 hours, 14 minutes.

Moonrise: 7:36 PM
Moonset: 6:05 AM.
Local moon “noon” (moon is due [geographically] south): 12:33 AM.
Illumination (%): 100 (full). Note: “Waxing” means growing fuller, “waning” means growing smaller. Full 28 Aug 6:34 AM.

UV FORECAST (local solar noon value):
Courtesy of National Weather Service, the forecast ultraviolet light value for today around solar noon (see just above) is 7 (on a basic scale of 0-11), or at the top of the “high” range.

PORTSMOUTH TIDES
(heights in parentheses…note Hampton/Seabrook correction below). Note: If you are using Boston-value Tide Charts when coming to Portsmouth, add 20 minutes to the Portsmouth High Water Values and 17 minutes to the Low.):

HIGH
tide: midnight AM (8.8) and 12:00 PM (8.2).

LOW tide: 5:43 AM (-0.4) and 5:53 PM (-0.1).

Data courtesy www.maineharbors.com <http://www.maineharbors.com>. or USC's WWW Tide and Current Predictor

Local time adjustments for tides from Portsmouth Harbor:

Location High Time
Low Time

Atlantic Heights, Piscataqua River +0:34 +0:23
Dover Point, Piscataqua River +1:30 +1:22
Salmon Falls, River entrance +1:32 +1:47
Squamscott River Railroad Bridge +2:16 +2:36
Exeter Docks +2:47 +3:05
Hampton/Seabrook Harbor +0:11 +0:27
Kittery Point -0:29 -0:29
York Harbor -0:19 -0:19
Kennebunkport -0:06 -0:06

ACTUAL OCEAN INFO FROM CAPE NEDDICK BUOY (http://www.gomoos.org/buoy/all_measure_buoy.shtml?buoy_id=B): Surfers and beach-admirers take note…wave heights have fallen to just under 2 as of 5 PM last evening.

Ocean temp (change since my last report): 65 (+2).
Wave height (change since my last report): 1.8 feet (down 1.2).
Dominant wave period: 11 sec.

Keep in mind wave heights are measured crest to trough, so the waves are roughly ½ that number above what would be the flat ocean surface.

Surface temperatures at the shoreline will vary from the buoy readings due to wind effects: sea breezes bring warmer water into the beach, while land breezes cause upwelling from below the surface and therefore considerably colder water for the toes. You'll find other neat local surfing info at www.surfnh.com with other surf info at www.surfinfo.com.

*NEW* Also check out this new Boston NWS site that gives satellite derived sea surface temps: http://www.erh.noaa.gov/box/seaSurfaceTemps.php

AIR QUALITY FORECAST FOR TODAY
: “good” for the NH/southern ME forecast area, “good” for the NE MA forecast area. Categories are “good”, “moderate”, “unhealthy for sensitive groups”, “unhealthy”, “very unhealthy” and “hazardous”. Data from USEPA's AIRNow map.

POLLEN FORECAST
: Courtesy of www.pollen.com, shows medium-high levels of 7.7 for today and high levels of 9.2 tomorrow (on a scale of 12). Principal pollens: Ragweed, Grass and Nettle.

PORTSMOUTH TEMP/PRECIP:

The monthly average high is 81, monthly average low is 57.
Record high/low for today: 96 (1993)/41 (1978).
The average high for today is 78, the average low 55.
For August, Portsmouth averages 3.47” and has unofficially received 1.77” so far.

MANCHESTER TEMP/PRECIP:
The monthly average high is 80, monthly average low is 53.
Record high/low for today: 96 (1948)/36 (1957).
The average high for today is 78, the average low 50.
For August, Manchester averages 3.59” and has received 0.59” so far.

ROADS/WALKWAYS
: in northern MA/southern NH/southern ME this morning were dry to damp.

FIRE DANGER: According to the National Interagency Fire Center, the Observed Fire Danger Class for NE MA, SE NH and southern ME was “moderate” across southern ME/SE NH as of yesterday, and “moderate” across NE MA. Categories are “low”, “moderate”, “high”, “very high”, and “extreme”.

ASTRONOMY NOTES (Courtesy Stardate.org): The Moon is full today, as it lines up opposite the Sun in our sky. Sunlight illuminates the entire lunar hemisphere that faces our way. The full Moon of August is known as the Green Corn Moon or Grain Moon.

LOCAL FLYING HAZARDS (based on current AIRMETS/SIGMETS):
Look for light to ocnl moderate non-convective turbulence from sfc-10,000 feet. Expect no non-convective icing.


If you have to make a pollution decision today, please choose to protect Mother Earth. Mitakuye oyasin (all living things are related).  We don't inherit the Earth from our ancestors...we borrow it from our children.  I'll report again tomorrow morning!

 

 

 

 

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