Friday, February 1, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, FEBRUARY 1, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD, DRY CONDITIONS PERSIST…

Temperatures continue to remain well below average, with last
night’s low reaching 5 F at 7 A.M. this morning.  24 hours
prior, yesterday’s low temperature of -2 F concluded the cooling
trend of the past few days.  Temperatures are still well below
seasonal averages, but today’s sustained westerly winds likely
means an end to cold air cycling in from the northwest.  High station
pressure continues to enforce an absence of thick, dense clouds,
and also providing decent visibility throughout today. Skies have
remained relatively clear with cirroform clouds dominating the
observable sky for most of the day.  Despite the recent cold spell,
the month of January has finished out both warmer and wetter than
average, with precipitation totals an inch above average.  Snowfall
totals continue to remain far below seasonal expectations.

Today’s Observations:

7 A.M.
Weather: Few cirrocumulus, few distant altocumulus NE-SE
Temperature: 5F; Dew Point: -10F; Wind: W at 12G18 kts
Sea-level pressure: 30.37 ins. Hg, rising, then more quickly
Visibility: 45 miles
6-hr Max temp: 7F
6-hr Min temp: 5F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: Trace
BHO SA 1155 CLR 45 283/5/-10/2712G18/037/
FEW CC FEW DSNT AC NE-SE/ 8/089 53010 10007 20005

10 A.M.
Weather: Broken cirrostratus, few cirrocumulus, few cirrus
Temperature: 12F; Dew Point: -4F; Wind: W at 10G17 kts
Sea-level pressure: 30.39 ins. Hg, rising steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 BKN 70 291/12/-4/2810G17/039/
FEW CC FEW CI/ 8/008/ 51008

1 P.M.
Weather: Broken cirrostratus, few cirrocumulus
Temperature: 17F; Dew Point: 0F; Wind: W at 10G21 kts
Sea-level pressure: 30.32 ins. Hg, increasing, then decreasing
Visibility: 70 miles
6-hr Max temp: 18F
6-hr Min temp: 5F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: Trace
BHO SA 1755 E250 BKN 70 267/17/0/2710G21/032/
FEW CC/ 8/008/ 58024 10018 20005

SUMMARY FOR THURSDAY, JANUARY 31, 2019

TEMPERATURE (DEGREES F)
MAX…..14   NORMAL…..34
MIN…..-2   NORMAL…..17
MEAN…..6   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL…………………..-20
TOTAL DEPARTURE FOR THE MONTH…………………..+27 [+0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..59   DEPARTURE……..+19
TOTAL HEATING UNITS FOR THE MONTH…………1120   DEPARTURE……..-26
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………………..33 WNW AT 12:07 A.M.
AERO…………………….35 WNW AT 12:10 A.M.
ASOS…………………….34 W   AT 12:08 A.M.
DAVIS……………………34 W   AT 12:07 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….26 W   AT  9:03 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….25 WNW AT 12:13 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………27 W   AT  9:06 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..14.8 W
ASOS…………………..14.5
DAVIS………………….15.5 W [272 deg.]

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……….5.35  DEPARTURE…….+1.00
ASOS…………..5.48
TOTAL PRECIPITATION FOR THE YEAR………..5.35  DEPARTURE…….+1.00
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…………….4.7  DEPARTURE…….-12.4
TOTAL SNOWFALL FOR THE SEASON…………..12.4  DEPARTURE…….-20.7

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 Low temp since midnight is 5F; normal low is 17F

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

RECORDS FOR FEBRUARY 1
HIGH 65F IN 1989
LOW -9F IN 1920
PRECIP 1.30 INS. IN 1898
SNOWFALL 11.0 INS. IN 1898
PEAK GUST 66e MPH SSW IN 1951

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

TODAY’S REPORT PREPARED BY: Nate Iannuccillo