Friday, March 31, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MARCH 31, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

LOW PRESSURE BRINGS RAIN/SNOW MIX TO GREAT BLUE HILL

Rain started in the early morning just before the 7 AM observation.
Precipitation varied all day between snow, sleet and rain. By 1 PM
0.16 inches of liquid precipitation was measured. The snow is having
a hard time accumulating on surfaces and a trace was measured by
1 PM. Winds were mild and out of the east and are picking up with
the winter storm approaching. Visibility decreased from 20 miles
to 1/8 mile and humidity increased as fog from the storm rolled onto
Great Blue Hill today.

Today’s Observations:

7 A.M.
Weather: Overcast stratus, Few cumulus WNW-SE, light rain
Temperature: 37F; Dew Point: 31F; Wind: E at 4 kts,
Wind speed: Light
Sea-level pressure: 30.17 ins. Hg, rising, then steady
Visibility: 20 miles except NNW-SE 50 miles, distant fog
all directions
6-hr Max temp: 36F
6-hr Min temp: 34F
24-hr precip: Trace
24-hr snowfall: 0.0 in.
BHO SA 1155 E84 OVC 20R- 218/37/31/0904/017/ FEW CU WNW-SE
VSBY NNW-SE 50 WND LGT DSNT FG ALQDS/ 8/16/ 51007 6000/ 10036 20034

10 A.M.
Weather: Fog, overcast stratus, light snow
Temperature: 35F; Dew Point: 34F; Wind: E at 8 kts
Sea-level pressure: 30.17 ins. Hg, rising then falling
Visibility: 5 miles
3-hr precip: 0.04 in.
3-hr snowfall: Trace
BHO SA 1455 E4 OVC 5S-F 218/35/34/0908/017/ NEW SNW PST 3 HOURS
TRACE/ 8//// MANUAL 60004 ASOS 60004 50000

1 P.M.
Weather: Obscurement with thick fog, snow
Temperature: 33F; Dew Point: 32F; Wind: E at 7 kts
Sea-level pressure: 30.13 ins. Hg, falling unsteadily
Visibility: 1/8 mile
6-hr Max temp: 37F
6-hr Min temp: 33F
6-hr precip: 0.12 in.
6-hr snowfall: Trace
BHO SA 1755 W3 X 1/8SF 203/33/32/0807/013/ NEW SNW PST 6 HOURS
TRACE/ 8//// MANUAL 6012/ ASOS 60014 56015 10037 20033

SUMMARY FOR THURSDAY, MARCH 30, 2017

TEMPERATURE (DEGREES F)
MAX…..50   NORMAL…..49
MIN…..30   NORMAL…..31
MEAN….40   NORMAL…..40

DEPARTURE FROM 30-YEAR NORMAL……………………..0
TOTAL DEPARTURE FOR THE MONTH…………………..-104 [-3.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..25   DEPARTURE………..0
TOTAL HEATING UNITS FOR THE MONTH………….995   DEPARTURE……..+104
TOTAL HEATING UNITS FOR THE SEASON………..4872   DEPARTURE……..-587
TOTAL HEATING UNITS LAST SEASON TO DATE……4409   DIFFERENCE…….+463

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 NW  AT  2:13 A.M.
AERO……………………21 NW  AT 12:21 A.M.
ASOS……………………23 NNW AT  2:13 A.M.
DAVIS…………………..19 NNW AT  2:15 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………14 NW  AT  2:13 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 WNW AT 12:11 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..14 NNW AT  2:15 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.1 NW
ASOS…………………..9.5
DAVIS………………….7.8 NNW [342 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE……-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.92  DEPARTURE……-1.48
ASOS…………..4.16
TOTAL PRECIPITATION FOR THE YEAR……….13.20  DEPARTURE……-0.62
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.2
TOTAL SNOWFALL FOR THE MONTH……………10.3  DEPARTURE…….-2.1
TOTAL SNOWFALL FOR THE SEASON…………..62.6  DEPARTURE…….+3.2

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

3/1  61/46/54/+23/0.01/0.0/000/00          41 S   AERO 45 S   RMY 45
3/2  55/26/41/+10/T/T/509/75               58 W   AERO 61 W   RMY 59
3/3  36/19/28/-4/T/T/592/87                38 W   AERO 44 W   RMY N/A
3/4  20/7/14/-18/T/T/622/91                45 NW  AERO 48 NW  RMY 51
3/5  29/5/17/-15/0.00/0.0/687/100          35 WNW AERO 43 WNW*RMY N/A
3/6  40/11/26/-6/0.00/0.0/641/93           18 WNW AERO 17 NW* RMY N/A
3/7  47/29/38/+5/0.01/0.0/000/00           32 S   AERO 35 S   RMY 36
3/8  55/43/49/+16/0.05/0.0/320/46          35 W   AERO 36 W   RMY 37
3/9  49/35/42/+9/0.0/0.0/684/98            53 W   AERO 59 W   RMY 58
3/10 35/20/28/-5/0.27/2.9/000/00           35 WNW AERO 44 WNW RMY 40
3/11 20/7/14/-20/0.02/0.2/612/87           43 W   AERO 47 W   RMY 50
3/12 25/4/15/-19/0.00/0.0/679/96           32 W   AERO 40 WNW RMY N/A
3/13 33/8/21/-13/0.00/0.0/667/94           25 WNW AERO 29 WNW RMY N/A
3/14 38/23/31/-4/2.15/7.3/000/00           60 NE  AERO 62 NE  RMY 62
3/15 27/15/21/-14/0.00/0.0/536/75          36 W   AERO 37 W   RMY N/A
3/16 33/17/25/-10/0.00/0.0/696/97          36 W   AERO 37 W   RMY 38
3/17 40/22/31/-5/0.00/0.0/577/80           25 WNW AERO 24 WNW RMY 27
3/18 36/24/30/-6/0.00/0.0/557/77           26 ENE AERO 24 ENE RMY 26
3/19 35/28/32/-4/0.01/T/153/21             39 N   AERO 37 N   RMY 39
3/20 49/29/39/+2/0.00/0.0/686/94           31 N   AERO 35 N   RMY 36
3/21 52/34/43/+6/0.00/0.0/418/57           28 W   AERO 26 W   RMY N/A
3/22 38/15/27/-10/T/T/603/82               46 NW  AERO 50 NW  RMY 51
3/23 36/13/25/-13/0.00/0.0/..              36 WNW AERO 35 WNW RMY 38
3/24 44/25/35/-3/0.02/T/…/..             37 S   AERO 38 S   RMY 39
3/25 44/31/38/0/0.07/…/…/..            22 NE  AERO 20 NE  RMY 21
3/26 42/29/36/-3/0.00/0.0/…/..           25 ENE AERO 23 ENE RMY 25
3/27 43/33/38/-1/0.51/0.0/000/00           22 E   AERO 18 E   RMY N/A
3/28 40/33/37/-2/…./0.0/000/00           16 N   AERO 15 N   RMY N/A TSTM
3/29 46/33/40/0/…./0.0/…/..            37 NW  AERO 36 NW  RMY 37  TSTM
3/30 50/30/40/0/0.00/0.0/…/..            23 NW  AERO 21 NW  RMY N/A

3/31 Low temp since midnight is 33F; normal low is now 32F

DAILY RECORDS FOR MARCH 2017

3/11/17: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 20F,
TIES PREVIOUS RECORD SET IN 1885

3/14/17: DAILY RECORD MAXIMUM SNOWFALL OF 7.3 INS,
BREAKS PREVIOUS RECORD OF 6.7 INS SET IN 1958

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

RECORDS FOR MARCH 31
HIGH 89 IN 1998  [RECORD HIGH FOR MONTH] LOW 16 IN 1923
PRECIP 2.89 IN 1987
SNOWFALL 15.0 IN 1997
PEAK GUST 81 MPH SSE IN 1987

RECORDS FOR APRIL 1
HIGH 74 IN 1967
LOW 6 IN 1923 [RECORD FOR MONTH] PRECIP 3.47 IN. IN 2004 [RECORD FOR MONTH] SNOWFALL 15.0 IN. IN 1997 [RECORD FOR MONTH] PEAK GUST 75 MPH SSW IN 1962

TODAY’S REPORT PREPARED BY: Kaitlin Geagan