Tuesday, January 20, 2015

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JANUARY 20, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

SKIES CLEAR, CALMER PATTERN SETS IN AT
GREAT BLUE HILL

Yesterday’s maximum temperature of 44F, was recorded
early in the day at midnight. As temperatures cooled
and warmed once more yesterday afternoon, a maximum
temperature of 42F was recorded just after the 1:00 PM
EST observation. Breezy westerly winds averaged 15.8 MPH.

Overnight, skies cleared even further, revealing blue
skies and excellent visibility today. By the 1:00 PM
EST observation some high cirrus was slowly overspreading
the sky with altocumulus distant in all directions.
Visibility had improved to 70 miles in all directions
with a maximum reading of 35F recorded thus far today.

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus
Temperature: 27F; Dew Point: 18F; Wind: W at 11 kts
Sea-level pressure: 29.81 ins. Hg, steady, then rising
Visibility: 50 miles, except 40 miles SSW-W
6-hr max temp: 28F
6-hr min temp: 26F
24-hr precip: None
BHO SA 1155 32 SCT 50 095/27/18/2811/981/
VSBY SSW-W 40 MI/ 8/500 53013 10028 20026

10 A.M.
Weather: Clear, few cumulus distant offshore NE-E,
altocumulus lenticularis distant WSW-WNW, few
cirrus distant ESE-WSW
Temperature: 30F; Dew Point: 17F; Wind: W at 15G22 kts
Sea-level pressure: 29.84 ins. Hg, rising, then steady
Visibility: 70 miles
BHO SA 1455 CLR 70 105/30/17/2615G22/984/ FEW CU DSNT
OFFSHR NE-E FEW ACSL DSNT WSW-WNW FEW CI DSNT ESE-WSW/
8/141 51010

1 P.M.
Weather: Scattered cirrus, few altocumulus
lenticularis distant in all directions
Temperature: 35F; Dew Point: 14F; Wind: WSW at 12G19 kts,
Sea-level pressure: 29.80 ins. Hg, falling then falling
more quickly
Visibility: 70 miles
6-hr max temp: 35F
6-hr min temp: 27F
BHO SA 1755 200 SCT 70 090/35/14/2512G19/980/
FEW ACSL DSNT ALQDS/ 8/041 58015 10035 20027

SUMMARY FOR MONDAY, JANUARY 19, 2015

TEMPERATURE (DEGREES F)
MAX…..44   NORMAL…..33
MIN…..28   NORMAL…..17
MEAN….36   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL…………………….+11
TOTAL DEPARTURE FOR THE MONTH…………………….-34 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..29  DEPARTURE……….-11
TOTAL HEATING UNITS FOR THE MONTH………….783  DEPARTURE……….+35
TOTAL HEATING UNITS FOR THE SEASON………..2843  DEPARTURE………-209
TOTAL HEATING UNITS LAST SEASON TO DATE……2965  DIFFERENCE……..-122

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………33  W    AT  1:51 P.M.
ASOS…………………..36  W    AT  1:51 P.M.
DAVIS………………….34  W    AT 11:07 A.M. RMY 36
FASTEST MILE FOR YESTERDAY………………..25  W    AT 11:06 A.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE……………..25  W    AT 11:13 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….24  W    AT 11:13 A.M.
AVERAGE WIND SPEED AND DIRECTION…………15.8  W
ASOS…………………14.9
DAVIS………………..13.4  W [270 degrees] * last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…..-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.74  DEPARTURE…..-0.96
ASOS…………..1.82
TOTAL PRECIPITATION FOR THE YEAR………..1.74  DEPARTURE…..-0.96
ASOS…………..1.82

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……-0.6
TOTAL SNOWFALL FOR THE MONTH…………….4.9  DEPARTURE……-5.8
TOTAL SNOWFALL FOR THE SEASON…………..15.9  DEPARTURE…..-10.8

PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

1/1  31/18/25/-2/0.00/0.0/544/99              29 SSW RMY 30
1/2  37/26/32/+5/0.00/0.0/314/57              35 WSW RMY 38
1/3  34/21/28/+2/0.67/2.5/017/03              25 SE  RMY 26
1/4  51/33/42/+16/0.48/0.0/000/00             30 SSW RMY N/A
1/5  46/13/30/+4/0.00/0.0/542/98              48 W   RMY 54
1/6  15/10/13/-13/0.02/0.4/000/00             29 W   RMY N/A
1/7  22/01/12/-14/0.01/0.3/383/69 *           43 WNW RMY 47
1/8  16/-5/6/-20/0.00/0.0/539/97              39 WNW RMY N/A
1/9  27/16/22/-4/0.08/0.9/201/36              35 WSW RMY 38
1/10 22/11/17/-8/0.00/0.0/541/97              26 WNW RMY 27
1/11 31/9/20/-5/45/0.00/0.0/123/22            26 SSW RMY N/A
1/12 36/31/34/+9/0.23/T/000/00                29 NNW RMY N/A
1/13 33/11/22/-3/0.00/0.0/524/93              30 NNW RMY 29
1/14 22/11/17/-8/T/T/000/00                   18 NNW RMY 16
1/15 27/20/24/-1/0.09/0.8/000/00              20 WSW RMY 22
1/16 35/12/24/-1/T/T/…/..                   46 WSW RMY 50
1/17 21/5/13/-12/0.00/0.0/…/..              30 WNW RMY N/A
1/18 50/19/35/+10/0.16/0.0/000/00             47 SE  RMY 52
1/19 44/28/36/+11/T/0.0/…/..                33 W   RMY 36

1/20 morning low temp: 26F since midnight; normal low is now 17F

* Sunshine minutes/percent on the 7th corrected from 394/71 to 383/69

DAILY RECORDS FOR JANUARY 2015
None so far.

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JANUARY 20
HIGH 59F IN 1951
LOW -9F IN 1901
PRECIP 1.95 INS. IN 1978
SNOWFALL 19.0 INS. IN 1978 [RECORD FOR MONTH] PEAK GUST 76e MPH NE IN 1978

RECORDS FOR JANUARY 21
HIGH 65F IN 1906
LOW -4F IN 1888,1893
PRECIP 2.49 INS. IN 1979
SNOWFALL 9.0 INS. IN 2014
PEAK GUST 78e MPH SE IN 1979

TODAY’S REPORT PREPARED BY: Brian Fitzgerald