Thursday, February 14, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, FEBRUARY 14, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

SUNNY AND BREEZY WITH GREAT VISIBILITY
FOLLOWING SOME OVERNIGHT SNOWFALL….

We measured 0.1 inches of snow from passing
showers last night. An excellent visibility
of 85 miles was seen at the 1 P.M. observation.
Wind was strong and westerly today, with an
average speed exceeding 20 mph and a peak gust
so far of 48 mph. Cloud cover this morning broke
up before noontime, along with a distant haze
that limited visibility to 35 miles at 7 A.M.
The high temperature so far today is 36F, the
same as our normal maximum temperature. The low
since midnight is 26F, 7 degrees above the daily
normal low of 19F.

PRELIMINARY STATS FOR JANUARY 2019

TEMPERATURE, Deg. F
Avg. Max. 34.3 [+0.5] Avg. Min. 17.9 [+0.8] Mean      26.1 [+0.6] 24-hour corrected mean: 26.7
Max. for month: 57F on  24th
Min. for month: -2F on the 21st and 31st

HEATING DEGREE DAYS
Total heating units:   1200 [-26] Total for the season:  3495 [-36] Total for last season: 3321

PRECIPITATION, Inches
Total: 5.35 [+1.00] Greatest in 24 hrs: 2 inches on the 19th-20th

SNOWFALL, Inches
Total: 4.7 [-12.4] Greatest in 24 hrs: 4.2 inches on the 19th-20th

WIND, mph
Avg. uncorrected wind speed: 13.4
Avg. corrected wind speed: 13.7
Prevailing wind direction: NW at 19%
Peak gust and direction: 77 S on 24th

SUNSHINE:
Campbell-Stokes card minutes: 8988 minutes of possible 17130 or 52%
Astronomical total minutes:   9273 minutes of possible 17650 or 53%

BHO Coldest January Daily Maximum Temperature, deg F (1885-2019):

1) -1 on January 28, 1888
2) 1 on January 12, 1886
3) 2 on January 8, 1968
4) 3 on January 6, 1896
3 on January 4, 1904
3 on January 21, 2019
7) 4 on January 17, 1907
4 on January 24, 1907
4 on January 16, 1994

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus
Temperature: 27F; Dew Point: 16F; Wind: W at 15G23 kts
Sea-level pressure: 29.85 ins. Hg, rising rapidly
Visibility: 35 mile, distant haze
6-hr Max temp: 29F
6-hr Min temp: 26F
24-hr Precip: 0.02 ins.
24-hr snowfall: 0.1 ins
Snow depth: 1 ins.
BHO SA 1155 90 SCT 35 107/27/16/2715G23/985/
DSNT HZ ALQDS/ 8/160 4/001 70002 51027 10029 20026

10 A.M.
Weather: Broken cumulus
Temperature: 31F; Dew Point: 15F; Wind: W at 20G38 kts,
Peak wind: 44 MPH (38 kts) at 9:46 A.M.
Sea-level pressure: 29.91 ins. Hg, rising steadily
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E50 BKN 60 129/31/15/2820G38/991/
PK WND 2838/46/ 8/800 51022

1 P.M.
Weather: Broken cumulus
Temperature: 36F; Dew Point: 18F; Wind: W at 18G28 kts,
Peak Wind: 37 MPH (32 kts) W at 11:43 A.M.
Sea-level pressure: 29.93 ins. Hg, rising steadily
Visibility: 85 miles
6-hr Max temp: 36F
6-hr Min temp: 26F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 1 in.
BHO SA 1755 E50 BKN 85 136/36/18/2718G28/993/
PK WND 2732/1643/ 8/800 4/001 50007 10036 20026

SUMMARY FOR WEDNESDAY, FEBRUARY 13, 2019

TEMPERATURE (DEGREES F)
MAX…..39   NORMAL…..36
MIN…..29   NORMAL…..19
MEAN….34   NORMAL…..28

DEPARTURE FROM 30-YEAR NORMAL……………………+6
TOTAL DEPARTURE FOR THE MONTH…………………..+59 [+4.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..31   DEPARTURE………-6
TOTAL HEATING UNITS FOR THE MONTH………….440   DEPARTURE……..-60
TOTAL HEATING UNITS FOR THE SEASON………..3936   DEPARTURE……..-95
TOTAL HEATING UNITS LAST SEASON TO DATE……3776   DIFFERENCE……+160

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..36 W   AT  2:39 P.M.
AERO…………………….32 W   AT  2:38 P.M.
ASOS…………………….35 W   AT  2:41 P.M.
DAVIS……………………36 WNW AT  2:41 P.M. RMY 36
FASTEST MILE FOR YESTERDAY………………….26 W   AT  2:41 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….25 W   AT  2:41 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………27 W   AT  2:41 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..13.3 W
ASOS…………………..13.1
DAVIS………………….13.6 NW [305 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.02  DEPARTURE…….-0.13
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE MONTH……….1.93  DEPARTURE…….+0.15
ASOS…………..1.89
TOTAL PRECIPITATION FOR THE YEAR………..7.28  DEPARTURE…….+1.15
ASOS…………..7.37

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.1  DEPARTURE……..-0.4
TOTAL SNOWFALL FOR THE MONTH…………….2.9  DEPARTURE……..-3.5
TOTAL SNOWFALL FOR THE SEASON…………..15.3  DEPARTURE…….-24.2

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/+15/0.37/0.0/386/72         53 W   AERO 53 W   RMY 54
01/02 34/24/29/+2/0.00/T/432/81            22 NW  AERO 22 NW  RMY N/A
01/03 42/28/35/+9/0.01/0.0/228/43          28 WNW AERO 30 WNW RMY 30
01/04 43/30/37/+11/0.00/0.0/354/66         29 SW  AERO 29 SW  RMY 29
01/05 41/32/37/+11/1.15/T/000/00           26 NE  AERO 25 NNW RMY 27
01/06 42/21/32/+6/0.00/T/300/56            42 NW  AERO 46 NW  RMY 50
01/07 26/14/20/-6/0.00/0.0/474/88 37 NW  AERO 41 NW  RMY N/A
01/08 40/24/32/+6/0.02/T/000/00            24 SSE AERO 23 SSE RMY N/A
01/09 42/31/37/+11/0.11/0.0/084/16         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/+3/0.23/1.6/198/36          30 E   AERO 30 E   RMY N/A
01/20 33/3/18/-7/1.77/2.6/000/00           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/-13/0.00/0.0/522/93          28 NW  AERO 30 NW  RMY 29
01/23 46/15/31/+6/0.00/0.0/000/00          37 SSW AERO 39 SSW RMY N/A
01/24 57/31/44/+19/1.44/0.0/000/00         77 S   AERO 79 S   RMY N/A
01/25 37/23/30/+5/0.00/0.0/378/66          41 WNW AERO 46 WNW RMY N/A
01/26 33/17/25/0/0.00/0.0/534/94           25 W   AERO 25 W   RMY 27
01/27 44/24/34/+9/0.00/0.0/480/84          39 S   AERO 39 S   RMY 41
01/28 30/19/28/+3/0.00/0.0/348/60          28 NW  AERO 28 NW  RMY N/A
01/29 32/19/26/+1/0.06/T/072/13            22 SE  AERO 21 E   RMY N/A
01/30 36/3/20/-6/0.19/0.5/504/88           52 W   AERO 53 W   RMY 57
01/31 14/-2/6/-20/0.00/0.0/570/99          33 WNW AERO 35 WNW RMY N/A

*Official gust chart reading low

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

02/01 19/5/12/-14/0.00/0.0/552/95          29 W   AERO 28 W   RMY N/A
02/02 30/7/19/-7/0.00/0.0/318/55           32 WSW AERO 32 WSW RMY 31
02/03 38/27/26/+7/0.00/0.0/126/22          26 S   AERO 25 S   RMY N/A
02/04 59/33/46/+20/0.00/0.0/540/93         25 SSW AERO 28 SSW RMY N/A
02/05 62/39/51/+25/0.00/0.0/354/60         30 WNW AERO 29 WNW RMY 32
02/06 39/28/34/+8/…./…/396/67          24 NNW AERO 23 NNW RMY N/A
02/07 37/31/34/+7/…./…/…/.. 28 ENE AERO 24 ENE RMY 28
02/08 51/27/39/+12/…./…/…/..         46 W   AERO 46 WNW RMY 51
02/09 32/20/26/-1/0.00/0.0/…/..          50 WNW AERO 52 WNW RMY 52
02/10 33/18/26/-1/0.00/0.0/…/..          24 WNW AERO 23 WNW RMY 25
02/11 34/21/28/+1/0.00/0.0/…/..          24 NNW AERO 23 NNW RMY 25
02/12 33/13/23/-4/…./2.8/…/..          32 E   AERO 30 E   RMY 26
02/13 39/29/34/+6/…./0.1/…/..          36 W   AERO 32 W   RMY 36

02/14 Low temp since midnight is 26F; normal low is 19F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR FEBRUARY 14
HIGH 56F IN 1949
LOW -14F IN 2016
PRECIP 2.09 INCHES IN 2007
SNOWFALL 11.0 INCHES IN 1914
PEAK GUST 83 MPH SSW IN 2000

RECORDS FOR FEBRUARY 15
HIGH 60F IN 1954
LOW -18F IN 1943
PRECIP 1.28 INCHES IN 1950
SNOWFALL 14.4 INCHES IN 2015
PEAK GUST 94e MPH WNW IN 1946

TODAY’S REPORT PREPARED BY: Benjamin Turner