Thursday, March 30, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MARCH 30, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

SUNNY SKIES RETURN TO BHO

Today has been a mild and pleasant spring day at the
top of Great Blue Hill.  Skies were mostly clear all
morning and early afternoon with few cumulus and cirrus
clouds.  Temperatures rose to 48F by 1:00PM EST following
an overnight low of 30F.  With dry conditions, dew points
remained in the low 20s.  Northwest winds have been low,
and visibility remained at 70 miles during each observation.

Today’s Observations:

7 A.M.
Weather: Few cumulus ENE-SE and SW-N
Temperature: 33F; Dew Point: 21F; Wind: NW at 10G15 kts
Sea-level pressure: 30.21 ins. Hg, rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 33F
6-hr Min temp: 30F
24-hr precip: 0.00 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 CLR 70 230/33/21/3210G15/021/ FEW CU ENE-SE AND SW-N/
8/100 51017 10033 20030

10 A.M.
Weather: Few cumulus NNE-SSE, few cirrus S-WNW
Temperature: 40F; Dew Point: 22F; Wind: NW at 7 kts
Sea-level pressure: 30.21 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 CLR 70 231/40/22/3207/021/ FEW CU NNE-SSE FEW CI S-WNW/
8/101 50001

1 P.M.
Weather: Few distant cumulus ESE, few cirrus SW-NW
Temperature: 48F; Dew Point: 20F; Wind: WNW at 8G14 kts
Sea-level pressure: 30.16 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 43F
6-hr Min temp: 36F
BHO SA 1755 CLR 70 215/48/20/2908G14/016/ FEW DSNT CU ESE
FEW CI SW-NW/ 8/101 58016 10048 20033

SUMMARY FOR WEDNESDAY, MARCH 29, 2017

TEMPERATURE (DEGREES F)
MAX…..46   NORMAL…..49
MIN…..33   NORMAL…..31
MEAN….40   NORMAL…..40

DEPARTURE FROM 30-YEAR NORMAL……………………..0
TOTAL DEPARTURE FOR THE MONTH…………………..-104 [-3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..25   DEPARTURE………..0
TOTAL HEATING UNITS FOR THE MONTH………….970   DEPARTURE……..+104
TOTAL HEATING UNITS FOR THE SEASON………..4847   DEPARTURE……..-587
TOTAL HEATING UNITS LAST SEASON TO DATE……4388   DIFFERENCE…….+459

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….37 NW  AT 3:54 P.M.
AERO……………………36 NW  AT 4:04 P.M.
ASOS……………………37 NNW AT 3:54 P.M.
DAVIS…………………..34 NNW AT 4:06 P.M. RMY 37
FASTEST MILE FOR YESTERDAY…………………29 NW  AT 4:05 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………28 NW  AT 4:25 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..27 NNW AT 4:25 P.M.
AVERAGE WIND SPEED AND DIRECTION………….12.9 NW
ASOS………………….12.7
DAVIS…………………11.2 N [360 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……….3.92  DEPARTURE……-1.31
ASOS…………..4.16
TOTAL PRECIPITATION FOR THE YEAR……….13.20  DEPARTURE……-0.45
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…….-0.3
TOTAL SNOWFALL FOR THE MONTH……………10.3  DEPARTURE…….-1.9
TOTAL SNOWFALL FOR THE SEASON…………..62.6  DEPARTURE…….+3.4

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 Low temp since midnight is 30F; normal low is now 31F

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 30
HIGH 83 IN 1977
LOW 10 IN 1887
PRECIP 2.92 INS. IN 2010
SNOWFALL 3.9 INS. IN 1957
PEAK GUST 60 MPH NW IN 1999

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

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle