Sunday, January 13, 2019

| January 13, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JANUARY 13, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD DAY WITH WIND FROM THE NORTHWEST AND GOOD VISIBILITY….

Cold temperatures linger in the area another day, with a high
so far of only 25F. Our normal high for today is 34F. Last
night we experienced a low of 12F, with a normal daily low of
17F. Since 7 A.M., visibility has remained excellent, with
a clear view of Mount Monadnock, and a prevailing visibility
of about 80 miles. Although pressure has been dropping
moderately quickly, cloud cover has remained at about 5/8ths
of the sky being covered throughout the day. For a majority of
the day so far, our wind has been coming from the northwest,
with a shift to the northeast before 1 o’clock. Wind speeds
are beginning to slow as the day progresses.

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, scattered altocumulus,
distant haze in all directions
Temperature: 12F; Dew Point: 2F; Wind: NW at 5 kts
Wind: light
Sea-level pressure: 30.45 ins. Hg, rising then falling
Visibility: 70 miles
6-hr Max temp: 15F
6-hr Min temp: 12F
24-hr Precip: 0.00
24-hr snowfall: 0.0
Snow depth: 0 ins.
BHO SA 1155 40 SCT 150 SCT 70 311/12/2/3205/045/ DSNT HZ ALQDS
FEW CU N-S WND LGT/ 8/570 50002 10015 20012

10 A.M.
Weather: Scattered stratocumulus, scattered cirrostratus
Temperature: 15F; Dew Point: 4F; Wind: NNW at 4 kts
Wind: light
Sea-level pressure: 30.47 ins. Hg, rising, then more quickly
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 180 SCT 250 SCT 80 319/15/4/3304/047/ WND LGT/
8/508 53008

1 P.M.
Weather: Scattered altostratus, scattered cirrostratus,
few cumulus NE-S
Temperature: 25F; Dew Point: 18F; Wind: NE at 5 kts
Wind: Light
Sea-level pressure: 30.40 ins. Hg, falling, then more quickly
Visibility: 80 miles
6-hr Max temp: 25F
6-hr Min temp: 12F
6-hr Precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 150 SCT 250 SCT 80 296/25/18/0505/040/ FEW CU NE-S
WND LGT/ 8/118 58023 10025 20012

SUMMARY FOR SATURDAY, JANUARY 12, 2019

TEMPERATURE (DEGREES F)
MAX…..26   NORMAL…..34
MIN……9   NORMAL…..17
MEAN….18   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL……………………-7
TOTAL DEPARTURE FOR THE MONTH…………………..+53 [+3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..47   DEPARTURE………+7
TOTAL HEATING UNITS FOR THE MONTH………….416   DEPARTURE……..-52
TOTAL HEATING UNITS FOR THE SEASON………..2712   DEPARTURE……..-61
TOTAL HEATING UNITS LAST SEASON TO DATE……2653   DIFFERENCE…….+59

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..32 NW AT 12:40 A.M.
AERO…………………….32 NW AT 12:57 A.M.
ASOS…………………….33 NW AT 12:41 A.M.
DAVIS……………………34 NW AT 12:40 A.M. RMY 29
FASTEST MILE FOR YESTERDAY………………….25 NW AT 12:39 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….24 NW AT 12:42 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………26 NW AT 12:39 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..13.3 NW
ASOS…………………..12.6
DAVIS………………….13.7 NW [310 deg.]

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……….2.14  DEPARTURE…….+0.44
ASOS…………..2.15
TOTAL PRECIPITATION FOR THE YEAR………..2.14  DEPARTURE…….+0.44
ASOS…………..2.15

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.6
TOTAL SNOWFALL FOR THE MONTH…………..Trace  DEPARTURE……..-6.8
TOTAL SNOWFALL FOR THE SEASON……………7.7  DEPARTURE…….-15.1

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 54/29/42/+15/…./0.0/…/..         53 W   AERO 53 W   RMY 54
01/02 34/24/29/+2/…./…/…/..          22 NW  AERO 22 NW  RMY N/A
01/03 42/28/35/+9/0.01/T/…/..            28 WNW AERO 30 WNW RMY 30
01/04 43/30/37/+11/…./…/…/..         29 SW  AERO 29 SW  RMY 29
01/05 41/32/37/+11/1.19/…/…/..         26 NE  AERO 25 NNW RMY 27
01/06 42/21/32/+6/0.00/0.0/…/..          42 NW  AERO 46 NW  RMY 50
01/07 26/14/20/-6/…/…/…/..    37 NW  AERO 41 NW  RMY N/A
01/08 40/24/32/+6/…/…/…/..           24 SSE AERO 23 SSE RMY N/A
01/09 42/31/37/+11/…/…/…/..          44 W   AERO 46 WNW RMY 45
01/10 32/20/26/+1/T/T/…/..               37 NW  AERO 41 NW  RMY 43
01/11 26/12/19/-6/0.00/0.0/…/..          36 WNW AERO 37 WNW RMY 38
01/12 26/9/18/-7/0.00/0.0/…/..           32 NW  AERO 32 NW  RMY 29

01/12 Low temp since midnight is 12F; normal low is 17F

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

RECORDS FOR JANUARY 13
HIGH 60F IN 2018
LOW -10F IN 1912,1914
PRECIP 1.54 INS. IN 1979
SNOWFALL 12.6 INS. IN 1964
PEAK GUST 74 MPH NE IN 1964

RECORDS FOR JANUARY 14
HIGH 65F IN 1995
LOW -12F IN 1914
PRECIP 1.45 INS. IN 2008
SNOWFALL 10.3 INS. IN 2008
PEAK GUST 68 MPH WNW IN 1976, S IN 2005

TODAY’S REPORT PREPARED BY:  Samantha Richard

Category: Daily Discussions

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