Wednesday, March 13, 2019

| March 13, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MARCH 13, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

LIGHT AND VARIABLE WINDS WITH INCREASING
AFTERNOON CLOUDS….

Nearly negligible cloud cover this morning became almost
overcast this afternoon following a pressure drop of 2 mb
since the 10 A.M. observation. Winds were light and variable
throughout the observation period, with a max gust of 12 mph
shortly before 1 P.M. A visibility of 70 miles was seen all
day, despite a thin smoke layer in the distance. Our snow
depth this morning was 4 ins., and 3 ins. this afternoon.
The high so far today is 42F, a degree under the daily
normal maximum of 43F. The low since midnight is 24F,
two degrees below the normal minimum of 26F.

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: 1.14 ins. on the 12th-13th

SNOWFALL, Inches
Total: 12.1 [-1.8]
Greatest in 24 hrs: 4.7 ins. on the 17th-18th

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: Scattered cirrus
Temperature: 26F; Dew Point: 15F; Wind: NW at 7 kts
Sea-level pressure: 30.35 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 28F
6-hr Min temp: 24F
24-hr Precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 4 ins.
BHO SA 1155 250 SCT 70 276/26/15/3307/035/
THN K LYR ALQDS/ 8/002 4/004 53016 10028 20024

10 A.M.
Weather: Scattered cirrostratus
Temperature: 35F; Dew Point: 13F; Wind: WSW at 2 kts,
Wind: Light and variable
Sea-level pressure: 30.37 ins. Hg, falling then rising
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 70 286/35/13/2502/037/
THN K LYR ALQDS WND L/V/ 8/002 50010

1 P.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 40F; Dew Point: 14F; Wind: SSW at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.34 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 42F
6-hr Min temp: 26F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 53 ins.
BHO SA 1755 110 SCT E250 BKN 70 271/40/14/2003/034/
WND L/V/ 8/078 4/003 58015 10042 20026

SUMMARY FOR TUESDAY, MARCH 12, 2019

TEMPERATURE (DEGREES F)
MAX…..41   NORMAL…..43
MIN…..27   NORMAL…..25
MEAN….34   NORMAL…..34

DEPARTURE FROM 30-YEAR NORMAL……………………..0
TOTAL DEPARTURE FOR THE MONTH……………………-56 [-4.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..31   DEPARTURE……….0
TOTAL HEATING UNITS FOR THE MONTH………….446   DEPARTURE……..+56
TOTAL HEATING UNITS FOR THE SEASON………..4932   DEPARTURE……..-26
TOTAL HEATING UNITS LAST SEASON TO DATE……4483   DIFFERENCE……+449

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..32 N   AT 10:48 A.M.
AERO…………………….33 N   AT 10:47 A.M.
ASOS…………………….33 NNW AT 10:54 A.M.
DAVIS……………………34 W   AT 10:54 A.M. RMY 34
FASTEST MILE FOR YESTERDAY………………….28 N   AT 10:54 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 NW  AT 10:55 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………27 W   AT 10:55 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..13.8 NNW
ASOS…………………..13.5
DAVIS………………….14.0 W [272 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.85  DEPARTURE…….+0.77
ASOS…………..2.91
TOTAL PRECIPITATION FOR THE YEAR……….11.79  DEPARTURE…….+1.29
ASOS………….11.96

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.4
TOTAL SNOWFALL FOR THE MONTH……………21.0  DEPARTURE…….+15.0
TOTAL SNOWFALL FOR THE SEASON…………..45.5  DEPARTURE……..-7.5

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/+8/0.35/T/396/67            24 NNW AERO 23 NNW RMY N/A
02/07 37/31/34/+7/0.35/0.0/000/00          28 ENE AERO 24 ENE RMY 28
02/08 51/27/39/+12/0.07/0.0/204/34         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/-4/0.90/2.8/000/00          32 E   AERO 30 E   RMY 26
02/13 39/29/34/+6/0.26/0.1/018/03          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 37/19/28/0/0.01/T/618/100            30 NNW AERO 25 NNW RMY N/A
02/18 30/16/23/-6/0.41/4.7/000/00          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/-10/0.12/0.3/000/00         16 WNW AERO 14 SSW RMY N/A
02/21 43/21/32/+3/0.33/0.7/294/47          36 W   AERO 33 W   RMY 38
02/22 43/30/37/+8/0.00/0.0/504/80          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/+8/0.40/0.0/000/00          41 W   AERO 37 W   RMY 47
02/25 37/25/31/+1/0.03/T/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/-15/0.10/1.2/180/28          35 WNW AERO 26 WNW RMY N/A
02/28 28/15/22/-9/0.17/2.3/486/75          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 24/10/17/-15/0.00/0.0/…/..          40 WNW AERO 25 WNW RMY 41
03/07 26/6/16/-17/0.00/0.0/…/..           35 W   AERO 18 W   RMY 34
03/08 35/11/23/-10/0.00/0.0/…/..          23 WSW AERO M  M   RMY M
03/09 43/22/33/0/0.00/0.0/…/..            20 WSW AERO M  M   RMY N/A
03/10 40/26/33/0/…./…/…/..            32 ESE AERO 23 S   RMY 32
03/11 48/33/41/+7/…./…/…/..           40 NW  AERO 37 NNW RMY 41
03/12 41/27/34/0/…./…/…/..            32 N   AERO 33 N   RMY 34

03/13 Low temp since midnight is 24F; normal low is 26F

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

RECORDS FOR MARCH 13
HIGH 72 IN 1990
LOW -1 IN 1885
PRECIP 2.47 INS. IN 1993
SNOWFALL 23.0 INS. IN 2018
PEAK GUST 76 MPH ENE IN 1993 [THE “STORM OF THE CENTURY”]

RECORDS FOR MARCH 14
HIGH 74 IN 1946
LOW 8 IN 1926
PRECIP 4.95 INS. IN 2010
SNOWFALL 7.3 INS. IN 2017
PEAK GUST 67 MPH ENE IN 2010

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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