Thursday, February 21, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, FEBRUARY 21, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

GOOD VISIBILITY AND INCREASING WIND FOLLOWING
THE WINTER WEATHER THIS MORNING….

Pressure dropped almost 25 millibars with the
winter precipitation, and has changed little
since this morning. Freezing fog and drizzle
subsided following the 10 A.M. observation.
We measured another inch of snowfall at 7 A.M.,
with 0.45 inches of liquid. Since then, only a
trace was seen. Fog this morning limited visibility
to a 1/16th mile, a fair contrast to the 70 miles
seen at 1 P.M. Wind has increased since noontime,
with an average speed of 20 mph from the west. The
peak gust so far today is 36 mph. The high temperature
so far today is 41F, 3 degrees above our normal high
temperature of 38F. The low since midnight is 21F, a
degree above the daily normal minimum of 20F.

Today’s Observations:

7 A.M.
Weather: Very light drizzle
Temperature: 29F; Dew Point: 29F; Wind: NW at 7 kts
Sea-level pressure: 29.85 ins. Hg, falling rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 29F
6-hr Min temp: 22F
24-hr Precip: 0.45 ins.
24-hr snowfall: 1.0 ins.
Snow depth: 4 ins.
BHO SA 1155 X W3 1/16L-F 109/29/29/3407/985/ L-CTD PCPN
VRY LGT/ 8//// 4/004 70045 58023 10029 20022

10 A.M.
Weather: Fog
Temperature: 30F; Dew Point: 30F; Wind: NW at 7 kts
Sea-level pressure: 29.84 ins. Hg, falling steadily
Visibility: 1/16 mile, fog
3-hr Precip: Trace
BHO SA 1455 X W3 1/16F 107/30/30/3007/984/ 8//// 600//
58002

1 P.M.
Weather: Broken altocumulus and cirrocumulus,
few stratus fractus in all directions
Temperature: 40F; Dew Point: 34F; Wind: NW at 21G26 kts,
Peak wind: 30 MPH (26 kts) NW at 12:49 P.M.
Sea-level pressure: 29.983 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 41F
6-hr Min temp: 28F
6-hr Precip:  Trace
6-hr snowfall: 0.0 ins.
Snow depth: 3 inches
BHO SA 1755 E65 BKN 200 BKN 70 105/40/34/3021G26/983/
FEW STFA ALQDS PK WND 3026/49/ 8/789 4/003 600//
58002 10041 20028

SUMMARY FOR WEDNESDAY, FEBRUARY 20, 2019

TEMPERATURE (DEGREES F)
MAX…..26   NORMAL…..38
MIN…..12   NORMAL…..20
MEAN….19   NORMAL…..29

DEPARTURE FROM 30-YEAR NORMAL…………………..-10
TOTAL DEPARTURE FOR THE MONTH…………………..+56 [+2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..46   DEPARTURE……..+10
TOTAL HEATING UNITS FOR THE MONTH………….699   DEPARTURE……..-58
TOTAL HEATING UNITS FOR THE SEASON………..4195   DEPARTURE……..-92
TOTAL HEATING UNITS LAST SEASON TO DATE……3950   DIFFERENCE……+245

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..16 WNW AT 12:03 A.M.
AERO…………………….14 SSW AT  3:33 P.M.
ASOS…………………….16 NW  AT 12:25 A.M.
DAVIS……………………18 S   AT  4:46 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….13 WNW AT 12:08 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….13 WNW AT 12:08 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………13 W   AT 12:08 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..7.3 WNW
ASOS…………………..7.4
DAVIS………………….7.7 SW [226 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.45  DEPARTURE…….+0.30
ASOS…………..0.43
TOTAL PRECIPITATION FOR THE MONTH……….2.91  DEPARTURE…….+0.10
ASOS…………..2.88
TOTAL PRECIPITATION FOR THE YEAR………..8.26  DEPARTURE…….+1.10
ASOS…………..8.36

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….1.0  DEPARTURE……..+0.5
TOTAL SNOWFALL FOR THE MONTH…………….8.6  DEPARTURE……..-1.3
TOTAL SNOWFALL FOR THE SEASON…………..21.0  DEPARTURE…….-22.0

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/…./4.7/…/..           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 26/12/19/-10/…./…/…/..         16 WNW AERO 14 SSW RMY N/A

02/21 Low temp since midnight is 21F; normal low is 20F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

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

RECORDS FOR FEBRUARY 22
HIGH 63F IN 1997
LOW -1F IN 1918
PRECIP 1.38 INCHES IN 1900
SNOWFALL 8.0 INCHES IN 1893
PEAK GUST 74 MPH S IN 1974

TODAY’S REPORT PREPARED BY: Benjamin Turner