Tuesday, February 19, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, FEBRUARY 19, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL AND DRY WITH GOOD VISIBILITY
FOLLOWING YESTERDAY’S SNOW….

The total measured for yesterday’s snow is 4.7 inches.
Today featured good visibility and dry conditions, with
a visibility of 80 miles and a relative humidity at or
below 30% by 1 P.M. Snow depth is currently at 4 inches,
and Ponkapoag is less than half frozen. Houghton’s pond
is still 9/10ths frozen. The high temperature so far today
is 28F, 10 degrees below our normal high temperature of 38F.
The low since midnight is 10F, 10 degrees below the daily
normal minimum of 20F.

Today’s Observations:

7 A.M.
Weather: Scattered cirrus, few distant cumulus offshore
Temperature: 11F; Dew Point: 3F; Wind: NW at 10 kts
Sea-level pressure: 30.43 ins. Hg, rising steadily
Visibility: 75 miles
6-hr Max temp: 15F
6-hr Min temp: 10F
24-hr Precip: 0.06 ins.
24-hr snowfall: 0.7 ins
Snow depth: 4 ins.
BHO SA 1155 250 SCT 75 304/11/3/3110/043/ FEW
DSNT CU OFFSHR/ 8/102 4/004 70006 51025 10015 20010

10 A.M.
Weather: Scattered cirrus, few distant cumulus offshore
Temperature: 21F; Dew Point: 6F; Wind: NW at 13G20 kts
Sea-level pressure: 30.49 ins. Hg, rising steadily
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 80 325/21/6/3113G20/049/ FEW
DSNT CU OFFSHR/ 8/102 51021

1 P.M.
Weather: Scattered cirrus
Temperature: 28F; Dew Point: 8F; Wind: W at 13G18 kts
Sea-level pressure: 30.49 ins. Hg, falling then rising
Visibility: 80 miles
6-hr Max temp: 28F
6-hr Min temp: 12F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 4 inches
BHO SA 1755 250 SCT 80 326/28/8/2813G18/049/ 8/002 4/004
50001 10028 20012

SUMMARY FOR MONDAY, FEBRUARY 18, 2019

TEMPERATURE (DEGREES F)
MAX…..30   NORMAL…..37
MIN…..16   NORMAL…..20
MEAN….23   NORMAL…..29

DEPARTURE FROM 30-YEAR NORMAL……………………-6
TOTAL DEPARTURE FOR THE MONTH…………………..+87 [+4.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..42   DEPARTURE………+6
TOTAL HEATING UNITS FOR THE MONTH………….608   DEPARTURE……..-76
TOTAL HEATING UNITS FOR THE SEASON………..4104   DEPARTURE…….-116
TOTAL HEATING UNITS LAST SEASON TO DATE……3917   DIFFERENCE……+187

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..35 NW  AT 11:23 P.M.
AERO…………………….36 NW  AT 11:20 P.M.
ASOS…………………….39 NW  AT 11:57 P.M.
DAVIS……………………38 W   AT 11:19 P.M. RMY 41
FASTEST MILE FOR YESTERDAY………………….29 NW  AT 11:57 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 NW  AT 11:57 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………29 W   AT 11:56 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.5 NNW
ASOS…………………..9.1
DAVIS………………….8.6 NW [218 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.06  DEPARTURE…….-0.09
ASOS…………..0.05
TOTAL PRECIPITATION FOR THE MONTH……….2.46  DEPARTURE…….-0.05
ASOS…………..2.45
TOTAL PRECIPITATION FOR THE YEAR………..7.81  DEPARTURE…….+0.95
ASOS…………..7.93

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.7  DEPARTURE……..+0.2
TOTAL SNOWFALL FOR THE MONTH…………….7.6  DEPARTURE……..-1.3
TOTAL SNOWFALL FOR THE SEASON…………..20.2  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/…./…/…/..           30 NNW AERO 25 NNW RMY N/A
02/18 30/16/23/-6/…./…/…/..          35 NW  AERO 36 NW  RMY 41

02/19 Low temp since midnight is 10F; normal low is 20F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

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

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

TODAY’S REPORT PREPARED BY: Benjamin Turner