Wednesday, February 20, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, FEBRUARY 20, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST WITH LIGHT WIND AND DROPPING
PRESSURE ATOP GREAT BLUE HILL….

We observed a pressure drop of almost 3 millibars
since the 10 A.M. observation. Skies remained overcast
throughout the day, and wind remained light with a peak
gust this morning of 14 mph. We did see a wind shift from
W-SW since this morning. Ponds are mostly frozen again,
with Ponkapoag at 9/10ths and Houghton’s fully iced over.
The high temperature so far today is 25F, 13 degrees below
our normal high temperature of 38F. The low since midnight
is 12F, 8 degrees below the daily normal minimum of 20F.

Today’s Observations:

7 A.M.
Weather: Overcast cirrostratus
Temperature: 17F; Dew Point: 4F; Wind: W at 8 kts
Sea-level pressure: 30.58 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 15F
6-hr Min temp: 12F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins
Snow depth: 4 ins.
BHO SA 1155 E250 OVC 70 353/17/4/2708/058/ 8/006
4/004 51006 10015 20012

10 A.M.
Weather: Overcast cirrostratus
Temperature: 23F; Dew Point: 6F; Wind: WNW at 5 kts,
Wind: Light
Sea-level pressure: 30.59 ins. Hg, rising steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 OVC 70 358/23/6/2905/059/ WND LGT/
8/006 51005

1 P.M.
Weather: Overcast altostratus
Temperature: 25F; Dew Point: 7F; Wind: SW at 5 kts,
Wind: Light
Sea-level pressure: 30.52 ins. Hg, falling rapidly
Visibility: 70 miles
6-hr Max temp: 25F
6-hr Min temp: 14F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 4 inches
BHO SA 1755 E130 OVC 70 334/25/7/2405/052/ WND LGT/ 8/02/
4/004 58024 10025 20014

SUMMARY FOR TUESDAY, FEBRUARY 19, 2019

TEMPERATURE (DEGREES F)
MAX…..30   NORMAL…..38
MIN…..10   NORMAL…..20
MEAN….20   NORMAL…..29

DEPARTURE FROM 30-YEAR NORMAL……………………-9
TOTAL DEPARTURE FOR THE MONTH…………………..+78 [+3.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..45   DEPARTURE………+9
TOTAL HEATING UNITS FOR THE MONTH………….653   DEPARTURE……..-68
TOTAL HEATING UNITS FOR THE SEASON………..4149   DEPARTURE…….-102
TOTAL HEATING UNITS LAST SEASON TO DATE……3943   DIFFERENCE……+206

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..35 NW  AT 12:03 A.M.
AERO…………………….33 NW  AT 12:06 A.M.
ASOS…………………….39 NW  AT 12:02 A.M.
DAVIS……………………40 W   AT 12:02 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….25 NW  AT 12:08 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….24 NW  AT 12:09 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………24 W   AT 12:09 A.M.
AVERAGE WIND SPEED AND DIRECTION………….12.5 WNW
ASOS………………….11.5
DAVIS…………………13.0 W [272 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.46  DEPARTURE…….-0.20
ASOS…………..2.45
TOTAL PRECIPITATION FOR THE YEAR………..7.81  DEPARTURE…….+0.80
ASOS…………..7.93

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH…………….7.6  DEPARTURE……..-1.8
TOTAL SNOWFALL FOR THE SEASON…………..20.2  DEPARTURE…….-22.5

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/…./…/000/00          28 ENE AERO 24 ENE RMY 28
02/08 51/27/39/+12/…./…/204/34         46 W   AERO 46 WNW RMY 51
02/09 32/20/26/-1/0.00/0.0/594/100         50 WNW AERO 52 WNW RMY 52
02/10 33/18/26/-1/0.00/0.0/510/85          24 WNW AERO 23 WNW RMY 25
02/11 34/21/28/+1/0.00/0.0/318/53          24 NNW AERO 23 NNW RMY 25
02/12 33/13/23/-4/…./2.8/000/00          32 E   AERO 30 E   RMY 26
02/13 39/29/34/+6/…./0.1/018/03          36 W   AERO 32 W   RMY 36
02/14 37/26/32/+4/0.00/0.0/…/..          44 WNW AERO 42 WNW RMY 45
02/15 49/29/39/+11/0.11/0.0/…/..         40 S   AERO 40 S   RMY 44
02/16 44/26/35/+7/0.00/0.0/…/..          25 NW  AERO 25 NW  RMY N/A
02/17 37/19/28/0/…./…/…/..           30 NNW AERO 25 NNW RMY N/A
02/18 30/16/23/-6/…./…/…/..          35 NW  AERO 36 NW  RMY 41
02/19 30/10/20/-9/0.00/0.0/…/..          35 NW  AERO 33 NW  RMY N/A

02/20 Low temp since midnight is 12F; normal low is 20F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR FEBRUARY 20
HIGH 68F IN 2018
LOW -4F IN 1966
PRECIP 1.90 INCHES IN 1934
SNOWFALL 15.0 INCHES IN 1921,1934
PEAK GUST 78 MPH NW IN 1972

RECORDS FOR FEBRUARY 21
HIGH 70F IN 2018
LOW -6F IN 1950
PRECIP 2.42 INCHES IN 1898
SNOWFALL 9.0 INCHES IN 1929
PEAK GUST 72 MPH WNW IN 1967

TODAY’S REPORT PREPARED BY: Benjamin Turner