Wednesday, March 6, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MARCH 6, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

WINDY AND COLD WITH PERFECT VISIBILITY AND
INCREASING CLOUDS IN THE AFTERNOON….

We observed a perfect visibility of 90 miles
at the 1 P.M. observation, despite significant
winds from the west of 20 mph or more. The highest
gust so far today is 40 mph. From the resultant
cold air advection, temperatures today remain well
below seasonal averages. The high temperature so far
today is 24F, 17 degrees below the daily maximum of 41F.
The low since midnight is 10F, 13 degrees below the
normal minimum of 23F. Cloud cover this morning was
almost clear, but increased following noontime. Dew
points have been in the negative single digits, with
a lowest humidity seen so far of 33%.

PRELIMINARY STATS FOR FEBRUARY 2019

TEMPERATURE, Deg. F
Avg. Max. 37.3 [+0.5] Avg. Min. 21.6 [+2.5] Mean      29.5 [+1.6] 24-hour corrected mean: 29.2
Max. for month: 62F on the 5th
Min. for month: 5F  on the 1st

HEATING DEGREE DAYS
Total heating units:    990 [-47] Total for the season:  4486 [-82] Total for last season: 4122

PRECIPITATION, Inches
Total: 3.61 [-0.46] Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 12.1 [-1.8] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 12.9
Avg. corrected wind speed: 13.3
Prevailing wind direction: WNW at 22%
Peak gust and direction: 66 W on 25th

SUNSHINE:
Campbell-Stokes card minutes: 9132 minutes of possible 17148 or 53%
Astronomical total minutes:   9476 minutes of possible 17766 or 53%

Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus NE-SSE
Temperature: 11F; Dew Point: 2F; Wind: W at 13G18 kts
Sea-level pressure: 29.99 ins. Hg, rising steadily
Visibility: 35 miles, distant haze
6-hr Max temp: 18F
6-hr Min temp: 10F
24-hr Precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 14 ins.
BHO SA 1155 CLR 35 157/11/2/2713G18/999/ FEW AC NE-SSE
DSNT HZ ALQDS/ 8/060 4/014 51014 10018 20010

10 A.M.
Weather: Clear, few cumulus
Temperature: 19F; Dew Point: -2F; Wind: W at 16G26 kts,
Peak wind: 30 MPH (26 kts) W at 9:36 A.M.
Sea-level pressure: 30.02 ins. Hg, falling then rising
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 60 165/19/-2/2816G26/002/ FEW CU ALQDS
PK WND 2826/36/ 8/100 50008

1 P.M.
Weather: Broken cumulus
Temperature: 23F; Dew Point: -2F; Wind: W at 20G30 kts,
Peak wind: 35 MPH (30 kts) W at 12:14 P.M.
Sea-level pressure: 29.98 ins. Hg, falling steadily
Visibility: 90 miles
6-hr Max temp: 24F
6-hr Min temp: 11F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 13 ins.
BHO SA 1755 E55 BKN 90 153/23/-2/2820G30/998/ PK WND 2834/14/
8/800 4/013 56012 10024 20011

SUMMARY FOR TUESDAY, MARCH 5, 2019

TEMPERATURE (DEGREES F)
MAX…..29   NORMAL…..41
MIN…..10   NORMAL…..23
MEAN….20   NORMAL…..32

DEPARTURE FROM 30-YEAR NORMAL……………………-12
TOTAL DEPARTURE FOR THE MONTH……………………-21 [-4.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..45   DEPARTURE……..+12
TOTAL HEATING UNITS FOR THE MONTH………….188   DEPARTURE……..+21
TOTAL HEATING UNITS FOR THE SEASON………..4679   DEPARTURE……..-61
TOTAL HEATING UNITS LAST SEASON TO DATE……4254   DIFFERENCE……+420

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..28 WNW AT 12:37 A.M.
AERO…………………….12 SW  AT 12:37 P.M.
ASOS…………………….28 W   AT 12:38 A.M.
DAVIS……………………28 WSW AT 12:38 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….21 WNW AT 12:39 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 WNW AT 12:38 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 W   AT 12:38 A.M.
AVERAGE WIND SPEED AND DIRECTION……………9.8 W
ASOS…………………..10.2
DAVIS…………………..9.9 SW [236 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.18
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.32  DEPARTURE…….+1.45
ASOS…………..2.35
TOTAL PRECIPITATION FOR THE YEAR……….11.26  DEPARTURE…….+1.97
ASOS………….11.40

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH……………20.0  DEPARTURE…….+17.4
TOTAL SNOWFALL FOR THE SEASON…………..44.5  DEPARTURE……..-5.1

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 38/27/33/+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/+4/0.00/0.0/594/97          44 WNW AERO 42 WNW RMY 45
02/15 49/29/39/+11/0.11/0.0/060/10         40 S   AERO 40 S   RMY 44
02/16 44/26/35/+7/0.00/0.0/504/82          25 NW  AERO 25 NW  RMY N/A
02/17 37/19/28/0/…./…/618/100          30 NNW AERO 25 NNW RMY N/A
02/18 30/16/23/-6/…./…/000/00          35 NW  AERO 36 NW  RMY 41
02/19 30/10/20/-9/0.00/0.0/618/99          35 NW  AERO 33 NW  RMY N/A
02/20 26/12/19/-10/…./…/000/00         16 WNW AERO 14 SSW RMY N/A
02/21 43/21/32/+3/…./…/294/47          36 W   AERO 33 W   RMY 38
02/22 43/30/37/+8/…./0.0/504/80          22 NW  AERO 21 NW  RMY 23
02/23 38/24/31/+1/0.00/0.0/336/53          18 NNW AERO 16 NNW RMY N/A
02/24 45/30/38/+8/…./…/000/00          41 W   AERO 37 W   RMY 47
02/25 37/25/31/+1/…./…/336/57          66 W   AERO 59 W   RMY M
02/26 29/14/22/-8/0.00/0.0/642/100         46 WNW AERO 39 WNW RMY 47
02/27 22/9/16/-15/…./…/180/28          35 WNW AERO 26 WNW RMY N/A
02/28 28/15/22/-9/…./…/486/75          22 NW  AERO 18 NW  RMY 22

PRELIMINARY CLIMATE SUMMARY FOR MARCH 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

03/01 38/17/28/-3/…./…/…/..           16 NNW AERO 13 NNW RMY 22
03/02 31/27/29/-2/…./…/…/.. 29 NNE AERO 22 NNE RMY 30
03/03 40/25/33/+1/…./…/…/..           21 ESE AERO 14 ESE RMY N/A
03/04 35/18/27/-5/…./…/…/..           33 W   AERO 18 W   RMY 32
03/05 29/10/20/-12/0.00/0.0/…/..          28 WNW AERO 12 SW  RMY N/A

03/06 Low temp since midnight is 10F; normal low is 23F

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

RECORDS FOR MARCH 6
HIGH 66 IN 1894
LOW 3 IN 1948, 2007
PRECIP 1.85 INS. IN 2001
SNOWFALL 15.5 INS. IN 2001
PEAK GUST 82 MPH S IN 1959

RECORDS FOR MARCH 7
HIGH 66 IN 1946
LOW -1 IN 1890
PRECIP 2.05 INS. IN 1967
SNOWFALL 11.5 INS. IN 2013
PEAK GUST 66 MPH NE IN 1962

TODAY’S REPORT PREPARED BY: Benjamin Turner