Saturday, February 2, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, FEBRUARY 2, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD DAY WITH PARTIAL CLOUD COVER AND DROPPING
HUMIDITY…

Although warmer than the past few days, today remained cold
with a high so far of 29F and a low so far of 7F. Throughout
the day, about 3/8ths of the sky was obscured by high level
clouds until the 1:00 P.M. observation where about 6/8ths
of the sky was blocked by both cirrostratus and altocumulus
clouds. A distant haze made visibility slightly less than
perfect, however, decent visibility persisted through each
observation at about 70 miles. Wind was steady at around 10
knots this morning, but increased to between 15 and 20 knots
by the early afternoon. Humidity has dropped drastically
throughout the day, from 78% at the 7:00 A.M. observation to
38% by the 1:00 P.M. observation.

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus, few altocumulus in
all directions
Temperature: 8F; Dew Point: 2F; Wind: W at 10 kts
Sea-level pressure: 30.29 ins. Hg, rising then falling
Visibility: 70 miles, distant haze in all directions
6-hr Max temp: 8F
6-hr Min temp: 7F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: Trace
BHO SA 1155 250 SCT 70 258/8/2/2810/029/ FEW AC ALQDS DSNT HZ
ALQDS/ 8/038 58003 10008 20007

10 A.M.
Weather: Scattered cirrostratus
Temperature: 17F; Dew Point: 7F; Wind: WSW at 7 kts
Sea-level pressure: 30.25 ins. Hg, falling, then more quickly
Visibility: 70 miles, distant haze in all directions
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 70 243/17/7/2407/025/ DSNT HZ ALQDS/
8/008 58015

1 P.M.
Weather: Broken cirrostratus, scattered altocumulus
Temperature: 28F; Dew Point: 6F; Wind: WSW at 16 kts
Sea-level pressure: 30.13 ins. Hg, decreasing, then more quickly
Visibility: 70 miles, distant haze in all directions
6-hr Max temp: 29F
6-hr Min temp: 7F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: Trace
BHO SA 1755 150 SCT E250 BKN 70 203/28/6/2416/013/ DSNT
HZ ALQDS 8/096 58055 10029 20007

SUMMARY FOR FRIDAY, FEBRUARY 1, 2019

TEMPERATURE (DEGREES F)
MAX…..19   NORMAL…..34
MIN……5   NORMAL…..17
MEAN….12   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL…………………..-14
TOTAL DEPARTURE FOR THE MONTH…………………..-14 [-14.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..53   DEPARTURE……..+14
TOTAL HEATING UNITS FOR THE MONTH…………..53   DEPARTURE……..+14
TOTAL HEATING UNITS FOR THE SEASON………..3491   DEPARTURE……..-35
TOTAL HEATING UNITS LAST SEASON TO DATE……3321   DIFFERENCE……+175

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 W AT  4:23 A.M.
AERO…………………….28 W AT  4:24 A.M.
ASOS…………………….28 W AT  4:25 A.M.
DAVIS……………………30 W AT 12:56 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….22 W AT  5:15 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 W AT  5:16 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 W AT  5:16 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..13.3 W
ASOS…………………..13.1
DAVIS………………….14.1 W [277 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……….0.00  DEPARTURE…….-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR………..5.35  DEPARTURE…….+0.87
ASOS…………..5.48

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE SEASON…………..12.4  DEPARTURE…….-21.2

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/…./0.0/386/72         53 W   AERO 53 W   RMY 54
01/02 34/24/29/+2/…./…/432/81          22 NW  AERO 22 NW  RMY N/A
01/03 42/28/35/+9/0.01/T/228/43            28 WNW AERO 30 WNW RMY 30
01/04 43/30/37/+11/…./…/354/66         29 SW  AERO 29 SW  RMY 29
01/05 41/32/37/+11/1.19/000/000/00         26 NE  AERO 25 NNW RMY 27
01/06 42/21/32/+6/0.00/0.0/300/56          42 NW  AERO 46 NW  RMY 50
01/07 26/14/20/-6/…/…/474/88 37 NW  AERO 41 NW  RMY N/A
01/08 40/24/32/+6/…/…/000/00           24 SSE AERO 23 SSE RMY N/A
01/09 42/31/37/+11/…/…/084/16          44 W   AERO 46 WNW RMY 45
01/10 32/20/26/+1/T/T/090/17               37 NW  AERO 41 NW  RMY 43
01/11 26/12/19/-6/0.00/0.0/366/68          36 WNW AERO 37 WNW RMY 38
01/12 26/9/18/-7/0.00/0.0/486/89           32 NW  AERO 32 NW  RMY 29
01/13 25/11/18/-7/0.00/0.0/456/84          18 NNW AERO 16 NW  RMY N/A
01/14 27/20/24/-1/0.00/0.0/120/22          20 NNE AERO 17 N   RMY N/A
01/15 34/18/26/1/0.00/0.0/402/73 22 NW  AERO 21 NNW RMY N/A
01/16 34/23/29/+4/0.00/0.0/270/47          33 W   AERO 32 W   RMY 35
01/17 27/13/20/-5/0.00/0.0/480/87          30 NNW AERO 28 NW  RMY N/A
01/18 40/21/31/+6/0.00/0.0/156/28          18 WNW AERO 18 WNW RMY N/A
01/19 31/24/28/+3/…/1.6/198/36           30 E   AERO 30 E   RMY N/A
01/20 33/3/18/-7/…/…/000/00            39 ENE AERO 43 ENE RMY 39
01/21 3/-2/1/-24/0.00/0.0/348/62           32*WNW AERO 41 WNW RMY M
01/22 24/0/12/-13/0.00/0.0/…/..          28 NW  AERO 30 NW  RMY 29
01/23 46/15/31/+6/0.00/0.0/…/..          37 SSW AERO 39 SSW RMY N/A
01/24 57/31/44/+19/1.44/0.0/…/..         77 S   AERO 79 S   RMY N/A
01/25 37/23/30/+5/0.00/0.0/…/..          41 WNW AERO 46 WNW RMY N/A
01/26 33/17/25/0/0.00/0.0/…/..           25 W   AERO 25 W   RMY 27
01/27 44/24/34/+9/0.00/0.0/…/..          39 S   AERO 39 S   RMY 41
01/28 30/19/28/+3/…./…/…/..          28 NW  AERO 28 NW  RMY N/A
01/29 32/19/26/+1/…./…/…/..          22 SE  AERO 21 E   RMY N/A
01/30 36/3/20/-6/…./0.5/…/..           52 W   AERO 53 W   RMY 57
01/31 14/-2/6/-20/0.00/0.0/…/..          33 WNW AERO 35 WNW RMY N/A

02/01 19/5/12/-14/0.00/0.0/…/..          29 W   AERO 28 W   RMY N/A

02/02 Low temp since midnight is 7F; normal low is 17F

*Official gust chart reading low

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

RECORDS FOR FEBRUARY 2
HIGH 55F IN 1951, 1973
LOW -12F IN 1961
PRECIP 1.91 INS. IN 1999
SNOWFALL 16.5 INS. IN 2015
PEAK GUST 92 MPH SW IN 1970

RECORDS FOR FEBRUARY 3
HIGH 58F IN 1991
LOW -7F IN 1955
PRECIP 2.14 INS. IN 1970
SNOWFALL 7.0 INS. IN 1913
PEAK GUST 102 MPH S IN 1970 [RECORD FOR MONTH]

TODAY’S REPORT PREPARED BY: Samantha Richard