Saturday, February 18, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, FEBRUARY 18, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

WARMER TEMPERATURES AND INCREASING WIND THROUGHOUT THE DAY

This morning, the temperature was 27F at the 7:00 A.M. EST observation,
but by 1:00 PM, the temperature had risen 20 degrees to a max of 47F.
The air was dry with the relative humidity at 1:00 P.M. being 37%.
There was broken altocumulus in the sky early on along with a few
altostratus and distant haze along the horizon, but the clouds turned
to scattered altocumulus later in the morning. In the early afternoon,
there was scattered altostratus and scattered cirrus, but the sun still
shined all day. Winds started to pick up as the morning went on. The
peak gust for the day so far is 27 kts (31 MPH) out of the SSW at 1:07 P.M.
Pressure was slowly falling throughout the day.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus, few altostratus in all directions
Temperature: 27F; Dew Point: 15F; Wind: SW at 9G16 kts
Sea-level pressure: 29.83 ins. Hg, rising, then falling
Visibility: 60 miles, distant haze in all directions
6-hr Max temp: 26F
6-hr Min temp: 24F
24-hr precip: 0.00 ins.
24-hr snowfall: 0.00 ins.
BHO SA 1155 E13 BKN 60 100/27/15/2309G16/983/ FEW AS ALQDS DSNT HZ ALQDS/
8/050 4/013 58001 10026 20024

10 A.M.
Weather: Scattered altocumulus, few altostratus in all directions
Temperature: 38F; Dew Point: 17F; Wind: SSW at 12G18 kts
Sea-level pressure: 29.79 ins. Hg, rising, then falling
Visibility: 70 miles
BHO SA 1455 14 SCT 70 087/38/17/2012G18/979/ FEW AS ALQDS/ 8/050 4/012 58013

1 P.M.
Weather: Scattered altostratus, scattered cirrus
Temperature: 46F; Dew Point: 21F; Wind: SSW at 18G26 kts,
Peak Wind: 26 kts (30 MPH) SSW at 12:18 PM
Sea-level pressure: 29.68 ins. Hg, falling, then more quickly
Visibility: 50 miles, distant haze
BHO SA 1755 15 SCT 25 SCT 50 051/46/21/2018G26/968/ DSNT HZ ALQDS PK WND
2026/18/ 8/012 4/011 57036 10047 20026

SUMMARY FOR FRIDAY, FEBRUARY 17, 2017

TEMPERATURE (DEGREES F)
MAX…..38   NORMAL…..37
MIN…..19   NORMAL…..19
MEAN….29   NORMAL…..28

DEPARTURE FROM 30-YEAR NORMAL…………………….+1
TOTAL DEPARTURE FOR THE MONTH……………………+18 [+0.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..36   DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE MONTH………….629   DEPARTURE………-18
TOTAL HEATING UNITS FOR THE SEASON………..3656   DEPARTURE……..-5232
TOTAL HEATING UNITS LAST SEASON TO DATE……3367   DIFFERENCE…….+289

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….36 WNW AT 10:31 A.M.
AERO……………………35 WNW AT  9:39 A.M.
ASOS……………………34 WNW AT 10:31 A.M.
DAVIS…………………..32 NNW AT  9:30 A.M. RMY 35
FASTEST MILE FOR YESTERDAY…………………23 WNW AT  9:45 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………24 WNW AT  3:25 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..24 NW  AT 10:16 A.M.
AVERAGE WIND SPEED AND DIRECTION………….16.6 WNW
ASOS………………….16.5
DAVIS…………………15.0 NW [310 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……+1.27
ASOS…………….NA
TOTAL PRECIPITATION FOR THE YEAR………..9.13  DEPARTURE……+2.42
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……+23.1
TOTAL SNOWFALL FOR THE SEASON…………..52.3  DEPARTURE……+10.8

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/…/..           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  38/19/29/+1/…./…/…/..           36 WNW AER0 35 WNW RMY 35

2/18  Low temp since midnight is 24F; 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 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

RECORDS FOR FEBRUARY 19
HIGH 66F IN 1981
LOW -5F IN 1923
PRECIP 2.73 INCHES IN 1972
SNOWFALL 12.0 INCHES IN 1893
PEAK GUST 76 MPH ENE IN 1972

TODAY’S REPORT PREPARED BY: Lizzy Suzedell