Friday, February 17, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, FEBRUARY 17, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY CLEAR AND SEASONABLE DAY

Temperatures today did not depart far from a normal February day. We had
an overnight low of 19F and a high of 37F at the 1pm observation. The air
was drier in the afternoon and the decrease in humidity made for excellent
visibility at both the 10 am and 1 pm obs at 90 miles. The winds continued
to come from the WNW and gusted to 30 kts (35 MPH).

Today’s Observations:

7 A.M.
Weather: Clear, few distant cumulus NW-E few cirrostratus N-NE
Temperature: 20F; Dew Point: 13F; Wind: WNW at 17G24 kts
Peak Wind: 29 kts (33 MPH) at 6:16 A.M.
Sea-level pressure: 29.66 ins. Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 23F
6-hr Min temp: 19F
24-hr precip: Trace
24-hr snowfall: Trace
BHO SA 1155 CLR 80 044/20/13/2917G24/966/ FEW DSNT CU NW-E
FEW CS N-NE NEW SNW PST 24 HRS TRACE PK WND 2829/16/ 8/105
4/013 52013 10023 20019

10 A.M.
Weather: Clear, few cirrostratus NW-NE
Temperature: 27F; Dew Point: 14F; Wind: WNW at 17G29 kts
Peak Wind: 30 WNW at 10:39 AM
Sea-level pressure: 29.68 ins. Hg, rising, then falling
Visibility: 90 miles
BHO SA 1455 CLR 90 052/27/14/3017G29/968/ FEW CS NW-NE PK WND 2930/39/
8/005 51008

1 P.M.
Weather: Clear, few cirrus S-NW
Temperature: 36F; Dew Point: 19F; Wind: WNW at 14G21 kts,
Peak Wind: 25 kts (29 MPH) WNW at 12:41 PM
Sea-level pressure: 29.67 ins. Hg, falling then falling more rapidly
Visibility: 90 miles
BHO SA 1755 CLR 90 049/36/19/2914G21/967/ FEW CI S-NW PK WND 2925/41/
8/001 58003 10037 20019

SUMMARY FOR THURSDAY, FEBRUARY 16, 2017

TEMPERATURE (DEGREES F)
MAX…..33   NORMAL…..37
MIN…..23   NORMAL…..19
MEAN….28   NORMAL…..28

DEPARTURE FROM 30-YEAR NORMAL……………………..0
TOTAL DEPARTURE FOR THE MONTH……………………+17 [+0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..37   DEPARTURE………..0
TOTAL HEATING UNITS FOR THE MONTH………….593   DEPARTURE………-18
TOTAL HEATING UNITS FOR THE SEASON………..3620   DEPARTURE……..-522
TOTAL HEATING UNITS LAST SEASON TO DATE……3339   DIFFERENCE…….+281

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….38 WNW AT 2:14 P.M.
AERO……………………38 WNW AT 2:13 P.M.
ASOS……………………38 WNW AT 2:13 P.M.
DAVIS…………………..37 NW  AT 2:12 P.M. RMY 40
FASTEST MILE FOR YESTERDAY…………………26 WNW AT 2:15 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………26 NW  AT 2:15 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..28 NW  AT 2:15 P.M.
AVERAGE WIND SPEED AND DIRECTION………….16.8 WNW
ASOS………………….16.5
DAVIS…………………15.0 NW [324 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE MONTH……….3.63  DEPARTURE……+1.42
ASOS…………….NA
TOTAL PRECIPITATION FOR THE YEAR………..9.13  DEPARTURE……+2.57
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……+23.6
TOTAL SNOWFALL FOR THE SEASON…………..52.3  DEPARTURE……+11.3

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/…/..           43 W   AERO 44 W   RMY 47
2/2   38/25/32/+6/T/T/…/..                36 WNW AERO 37 WNW RMY 36
2/3   30/19/25/-1/0.00/0.0/…/..           28 WNW AERO 29 WNW RMY 31
2/4   31/15/23/-3/0.00/0.0/…/..           31 WNW AERO 30 WNW RMY N/A
2/5   43/22/33/+7/0.00/0.0/…/..           38 SSW AERO 41 SSW RMY N/A
2/6   37/28/33/+7/0.00/0.0/…/..           41 WNW AERO 41 WNW RMY 43
2/7   37/30/34/+7/0.54/0.7/…/..           32 ENE AERO 31 ENE RMY 32
2/8   49/25/37/+10/T/0.0/…/..             25 W   AERO 25 W   RMY 31
2/9   35/8/22/-5/1.60/16.9/…/..           54 NNE AERO 53 NNE RMY 54
2/10  24/7/16/-11/T/T/…/..                43 WNW AERO 50 WNW RMY 48
2/11  27/15/21/-6/0.14/2.9/…/..           21 SE  AERO 20 SE  RMY 19
2/12  32/17/25/-2/0.71/5.6/…/..           22 ENE AERO 28 ENE RMY N/A
2/13  32/20/26/-2/0.27/2.2/…/..           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  Low temp since midnight is 19F; normal low is now 19F

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 17
HIGH 61F IN 1981
LOW -16F IN 1896
PRECIP 1.86 INCHES IN 2003
SNOWFALL 20.0 INCHES IN 2003
PEAK GUST 72 MPH NW IN 1968

RECORDS FOR FEBRUARY 18
HIGH 65F IN 1981
LOW -10F IN 1958
PRECIP 1.97 INCHES IN 1887
SNOWFALL 9.2 INCHES IN 1952
PEAK GUST 70 MPH S IN 2008

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle and Kaitlin Geagan