Monday, February 20, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, FEBRUARY 20, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY CLEAR SKIES AND COOLER TEMPS TO END HOLIDAY WEEKEND

Yesterday finished with a max. temp. of 58F and a min. temp.
of 42F making the day 21F above normal.  While temps. remain
warmer than average today, they have been cooler than previous
days and have only reached 42F by 1:00PM.  Gusty NNW winds have
made the day feel even chillier.

Conditions are drier today with dew points falling unto the upper
teens.  The dry conditions have allowed for few cumulus all day
and great visibility at 70 miles.

Today’s Observations:

7 A.M.
Weather: Few cumulus in all directions
Temperature: 35F; Dew Point: 24F; Wind: NW at 8 kts
Sea-level pressure: 30.08 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 42F
6-hr Min temp: 35F
24-hr precip: 0.00 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 CLR 70 186/35/24/3208/008/ FEW CU ALQDS/
8/100 4/006 53038 10042 20035

10 A.M.
Weather: Few cumulus in all directions, few altocumulus N-SE
Temperature: 39F; Dew Point: 21F; Wind: NNW at 8G18 kts
Sea-level pressure: 30.14 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 CLR 70 207/39/21/3308G18/014/ FEW CU ALQDS FEW AC N-SE/
8/160 51021

1 P.M.
Weather: Few cumulus in all directions
Temperature: 41F; Dew Point: 18F; Wind: NNW at 13G17 kts
Sea-level pressure: 30.15 ins. Hg, steady then falling
Visibility: 70 miles
BHO SA 1755 CLR 70 210/41/18/3313G17/015/ FEW CU ALQDS/
8/100 4/005 51003 10042 20035

SUMMARY FOR SUNDAY, FEBRUARY 19, 2017

TEMPERATURE (DEGREES F)
MAX…..58   NORMAL…..38
MIN…..42   NORMAL…..20
MEAN….50   NORMAL…..29

DEPARTURE FROM 30-YEAR NORMAL……………………+21
TOTAL DEPARTURE FOR THE MONTH……………………+47 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..15   DEPARTURE………-21
TOTAL HEATING UNITS FOR THE MONTH………….672   DEPARTURE………-49
TOTAL HEATING UNITS FOR THE SEASON………..3699   DEPARTURE……..-552
TOTAL HEATING UNITS LAST SEASON TO DATE……3443   DIFFERENCE…….+256

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….32 W   AT 2:43 P.M.
AERO……………………33 W   AT 2:44 P.M.
ASOS……………………35 W   AT 2:43 P.M.
DAVIS…………………..32 WNW AT 2:42 P.M. RMY 32
FASTEST MILE FOR YESTERDAY…………………22 W   AT 2:43 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 W   AT 2:44 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..23 W   AT 3:27 P.M.
AVERAGE WIND SPEED AND DIRECTION………….14.3 WSW
ASOS………………….13.5
DAVIS…………………12.9 WNW [290 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……….3.63  DEPARTURE……+0.97
ASOS…………….NA
TOTAL PRECIPITATION FOR THE YEAR………..9.13  DEPARTURE……+2.12
ASOS…………….NA

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE MONTH……………31.5  DEPARTURE……+22.1
TOTAL SNOWFALL FOR THE SEASON…………..52.3  DEPARTURE…….+9.8

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

2/1   40/25/33/+7/0.03/0.4/228/38           43 W   AERO 44 W   RMY 47
2/2   38/25/32/+6/T/T/265/44                36 WNW AERO 37 WNW RMY 36
2/3   30/19/25/-1/0.00/0.0/351/58           28 WNW AERO 29 WNW RMY 31
2/4   31/15/23/-3/0.00/0.0/590/97           31 WNW AERO 30 WNW RMY N/A
2/5   43/22/33/+7/0.00/0.0/092/15           38 SSW AERO 41 SSW RMY N/A
2/6   37/28/33/+7/0.00/0.0/503/82           41 WNW AERO 41 WNW RMY 43
2/7   37/30/34/+7/0.54/0.7/000/00           32 ENE AERO 31 ENE RMY 32
2/8   49/25/37/+10/T/0.0/136/22             25 W   AERO 25 W   RMY 31
2/9   35/8/22/-5/1.60/16.9/000/00           54 NNE AERO 53 NNE RMY 54
2/10  24/7/16/-11/T/T/623/100               43 WNW AERO 50 WNW RMY 48
2/11  27/15/21/-6/0.14/2.9/000/00           21 SE  AERO 20 SE  RMY 19
2/12  32/17/25/-2/0.71/5.6/000/00           22 ENE AERO 28 ENE RMY N/A
2/13  32/20/26/-2/0.27/2.2/032/05           48 NW  AERO 60 NW  RMY 61
2/14  35/16/26/-2/0.00/0.0/…/..           23 NW  AERO 24 NW  RMY 24
2/15  40/25/33/+5/…./…/…/..           31 SE  AERO 33 NW  RMY N/A
2/16  33/23/28/0/…./…/…/..            38 WNW AERO 38 WNW RMY 40
2/17  38/19/29/+1/0.00/0.0/…/..           36 WNW AER0 35 WNW RMY 35
2/18  50/24/37/+8/0.00/0.0/…/..           31 SSW AERO 33 SSW RMY 34
2/19  58/42/50/+21/0.00/0.0/…/..          32 W   AERO 33 W   RMY 32

2/20  Low temp since midnight is 35F; normal low is now 20F

DAILY RECORDS FOR FEBRUARY 2017

2/09/17: NEW DAILY RECORD MAXIMUM SNOWFALL OF 16.9 INS.
PREVIOUS RECORD WAS 14.0 INS. SET IN 2015

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

RECORDS FOR FEBRUARY 20
HIGH 66F IN 1930
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 62F IN 1930
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: Cecilia Borries-Strigle