Monday, January 18, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, JANUARY 18, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0709E
SUNSET: 1641E
BLUSTERY, BUT MILD AND DRY TODAY AT BLUE HILL….
After an 8 day stretch of light winds last week, we’re now on
day 3 of gusty winds here on the summit. Peak gust so far
today is 31 mph.
Plenty of sun this morning has now been joined by convective
stratocumulus clouds, making for a mix of sun and clouds early
this afternoon.
Visibility has improved from 40 miles early this morning to
60 miles early this afternoon.
The stretch of above normal temperatures continues as well.
Today marks the 29th consecutive day of above normal
temperatures, stretching back to December 21st!
The high temperature so far today is 43F, this is 10 degrees
above the daily normal maximum of 33F. The low since midnight
is 34F, 17 degrees above the normal minimum of 17F.
Today’s Observations:
7 A.M.
Weather: Clear, few altocumulus/altostratus all quadrants,
few cirrus distant E-ESE
Temperature: 34F; Dew Point: 25F; Relative Humidity: 69%
Wind: SW @ 10G16 kts
Sea-level pressure: 29.63 in Hg; falling then rising
Visibility: 40 miles, hazy
6-hr Max temp: 36F
6-hr Min temp: 34F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 40 034/34/25/2210G16/963/ FEW AC/AS ALQDS
FEW CI DSNT E-ESE HAZY/ 8/071 53003 10036 20034
10 A.M.
Weather: Clear, few stratocumulus all quadrants, few altocumulus all
quadrants
Temperature: 39F; Dew Point: 27F; Relative Humidity: 61%
Wind: WSW @ 10G18 kts
Sea-level pressure: 29.64 in Hg; rising, then falling
Visibility: 60 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 CLR 60 038/39/27/2410G18/964/ FEW SC ALQDS
FEW AC ALQDS/ 8/570 53004
1 P.M.
Weather: Broken stratocumulus, broken cirrus, virga distant WNW-N-NE
Temperature: 43F, Dew point: 22F; Relative Humidity: 42%
Wind: W @ 16G27 kts, peak of 31 mph W at 12:48 P.M.
Sea-level pressure: 29.58 inches Hg, falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 43F
6-hr Min temp: 34F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E45 BKN 250 BKN 60 018/43/22/2616G27/958/
VIRGA DSNT WNW-N-NE PK WND 2627/48/ 8/501 58020 10043 20034
SUMMARY FOR SUNDAY, JANUARY 17, 2021
TEMPERATURE (DEGREES F)
MAX…….41 NORMAL…..33
MIN…….32 NORMAL…..17
MEAN……37 NORMAL…..25
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+12
TOTAL DEPARTURE FOR THE MONTH……………….+128 [+7.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………28 DEPARTURE……-12
TOTAL HEATING UNITS FOR THE MONTH…………..541 DEPARTURE…..-127
TOTAL HEATING UNITS FOR THE SEASON…………2471 DEPARTURE…..-501
TOTAL HEATING UNITS LAST SEASON TO DATE…….2749 DEPARTURE…..-278
PEAK WIND GUST (MPH):
420C/Official…………..47 W @ 2:33 P.M.
AEROVANE (south tower)…..46 W @ 2:33 P.M.
ASOS…………………..46 W @ 2:32 P.M.
DAVIS #1……………….49 WNW @ 2:23 P.M.
DAVIS #2 (south tower)…..46 W @ 2:31 P.M.
RMY……………………54 @ 2:31 P.M.
VECTOR…………………52 @ 2:31 P.M.
MERLIN…………………48
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………35 W @ 11:00 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….33 W @ 2:33 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………36 W @ 2:33 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………36 W @ 2:33 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..33 W @ 10:58 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..32 @ 10:59 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…19.6 WSW [471 total miles]
ASOS………………18.7 [449 total miles]
DAVIS #1…………..19.9 W [478 total miles]
DAVIS #2…………..19.4 W [466 total miles]
RMY……………….18.0 W [432 total miles]
VECTOR…………….18.3 [439 total miles]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.14
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….1.94 DEPARTURE….-0.48
ASOS………….2.00
TOTAL PRECIPITATION FOR THE YEAR…………..1.94 DEPARTURE….-0.48
ASOS…………2.00
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0 DEPARTURE…..-0.5
TOTAL SNOWFALL FOR THE MONTH……………… 1.9 DEPARTURE…..-7.6
TOTAL SNOWFALL FOR THE SEASON……………..28.1 DEPARTURE…..+2.6
PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY: R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
01/01 36/25/31/+4/0.06/0.3/330/60 23 E AERO 23 NNW RMY 23
01/02 43/30/37/+10/0.30/T/116/21 37 WNW AERO 39 WNW RMY 44
01/03 33/27/30/+4/0.07/0.8/000/00 23 NNE AERO 22 NNE RMY 25
01/04 37/28/33/+7/0.01/0.1/110/20 25 NNE AERO 23 NNE RMY 27
01/05 31/28/30/+4/0.05/0.7/000/00 21 NNW AERO 21 NNW RMY 22
01/06 38/28/33/+7/T/T/244/44 30 NW AERO 29 NW RMY 32
01/07 42/26/34/+8/0.00/0.0/516/93 28 NNW AERO 26 NNW RMY 31
01/08 40/21/31/+5/0.00/0.0/517/93 25 NNW AERO 22 NNW RMY 25
01/09 34/30/27/+1/0.00/0.0/395/71 25 N AERO 23 N RMY 24
01/10 39/24/32/+7/0.00/0.0/493/88 25 NNW AERO 23 NNW RMY 24
01/11 34/25/30/+5/0.00/0.0/000/00 17 SW AERO 16 SSW RMY 16
01/12 40/24/32/+7/0.00/0.0/…/.. 23 WNW AERO 23 WNW RMY 24
01/13 40/26/33/+8/0.00/0.0/…/.. 15 SW AERO 14 SW RMY 19
01/14 38/31/35/+10/0.09/T/…/.. 16 SSW AERO 16 SSW RMY 19
01/15 40/32/36/+11/0.00/0.0/…/.. 25 ESE AERO 23 ESE RMY 27 TSTM
01/16 52/33/43/+18/1.00/0.0/…/.. 48 ESE AERO 53 SE RMY 54
01/17 41/32/37/+12/0.00/0.0/…/.. 47 W AERO 46 W RMY 54
01/18 The low since midnight is 34F, the daily normal low is 17F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JANUARY 18
HIGH 62F IN 1973,1990
LOW -10F IN 1982
PRECIP 1.68 INS. IN 1915
SNOWFALL 13.0 INS. IN 1948
PEAK GUST 85 MPH SSE IN 2006
RECORDS FOR JANUARY 19
HIGH 59F IN 1973
LOW -11F IN 1887
PRECIP 2.34 INS. IN 1936
SNOWFALL 10.5 INS. IN 1936
PEAK GUST 93e MPH WNW IN 1943
TODAY’S REPORT PREPARED BY: Matt Douglas
