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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, MARCH 24, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH PRESSURE MOVES OFFSHORE BRINGING PRECIPITATION

Yesterday's high pressure has moved off shore bringing a rain/snow mix 
to Great Blue Hill just after 12:00 PM EST today. The humidity rose and 
pressure dropped rapidly as the precipitation moved in this afternoon.
Temperatures continue to be below normal with a high of 39F by the 1:00PM 
EST observation the normal high for today 46F. Winds shifted just after 
2:00 AM EST from the west to the south and remained moderate today with 
a peak gust so far of 32 kts (37 MPH) at 12:14 PM EST. 

Today's Observations:

7 A.M.
Weather: Scattered altocumulus, Broken cirrostratus
Temperature: 30F; Dew Point: 8F; Wind: S 12 kts
Sea-level pressure: 30.48 ins. Hg, steady then falling 
Visibility: 60 miles
6-hr Max temp: 30F
6-hr Min temp: 25F
24-hr precip: 0.00 
24-hr snowfall: 0.0 
BHO SA 1155 E110 SCT E250 BKN 60 321/30/08/1712/048/ 8/036 
4/001 58006 10030 20025

10 A.M.
Weather: Overcast altostratus, few cumulus SSE-SW 
Temperature: 37F; Dew Point: 24F; Wind: S at 14 kts
Sea-level pressure: 30.41 ins. Hg, falling steadily 
Visibility: 45 miles
BHO SA 1455 E70 OVC 45 298/37/24/1914/041/ FEW CU SSE-SW 8/12/ 
57023 

1 P.M.
Weather: Light snow, broken cumulus, overcast nimbostratus 
Temperature: 34F; Dew Point: 34F; Wind: S at 17G23 kts,
Peak wind: 32 kts (37 MPH) @ 12:14 P.M. 
Sea-level pressure: 30.26 ins. Hg, falling rapidly 
Visibility: 20 miles, distant fog all directions 
6-hr Max temp: 39F
6-hr Min temp: 30F
6-hr precipitation: 0.01 inches
6-hour snowfall: Trace
BHO SA 1755 E20 BKN E32 OVC 20S- 247/34/34/1717G23/026/ DSNT FG ALQDS 
PK WND 1932/14 NEW SNW PST 6HRS TRACE PRESFR/ 8/12/ 53051 MANUAL 60001 
10039 20030

SUMMARY FOR THURSDAY, MARCH 23, 2017
 
TEMPERATURE (DEGREES F)
MAX.....36   NORMAL.....46
MIN.....13   NORMAL.....29
MEAN....25   NORMAL.....37

DEPARTURE FROM 30-YEAR NORMAL........................-13
TOTAL DEPARTURE FOR THE MONTH........................-95 [-4.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............40   DEPARTURE.........+13
TOTAL HEATING UNITS FOR THE MONTH.............804   DEPARTURE.........+95
TOTAL HEATING UNITS FOR THE SEASON...........4681   DEPARTURE........-596
TOTAL HEATING UNITS LAST SEASON TO DATE......4237   DIFFERENCE.......+444

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................36 WNW  AT 3:39 P.M.
                   AERO........................35 WNW  AT 3:41 P.M.
                   ASOS........................36 WNW  AT 3:50 P.M.
                   DAVIS.......................35 NNW  AT 3:40 P.M. RMY 38
FASTEST MILE FOR YESTERDAY.....................25 WNW  AT 3:29 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................24 NW   AT 3:51 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................24 NW   AT 3:41 P.M.
AVERAGE WIND SPEED AND DIRECTION.............14.1 WNW
                   ASOS......................13.9
                   DAVIS.....................12.8 NW [323 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.20
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........2.52  DEPARTURE......-1.59
                         ASOS..............2.73
TOTAL PRECIPITATION FOR THE YEAR..........11.80  DEPARTURE......-0.73
                         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.......-0.4
TOTAL SNOWFALL FOR THE MONTH...............10.3  DEPARTURE.......+0.1
TOTAL SNOWFALL FOR THE SEASON..............62.6  DEPARTURE.......+5.2


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/.../..          35 W   AERO 36 W   RMY 37
3/9  49/35/42/+9/0.0/0.0/.../..            53 W   AERO 59 W   RMY 58 
3/10 35/20/28/-5/0.27/2.9/.../..           35 WNW AERO 44 WNW RMY 40
3/11 20/7/14/-20/0.02/0.2/.../..           43 W   AERO 47 W   RMY 50
3/12 25/4/15/-19/0.00/0.0/.../..           32 W   AERO 40 WNW RMY N/A
3/13 33/8/21/-13/0.00/0.0/.../..           25 WNW AERO 29 WNW RMY N/A
3/14 38/23/31/-4/2.15/7.3/.../..           60 NE  AERO 62 NE  RMY 62
3/15 27/15/21/-14/0.00/0.0/.../..          36 W   AERO 37 W   RMY N/A
3/16 33/17/25/-10/0.00/0.0/.../..          36 W   AERO 37 W   RMY 38
3/17 40/22/31/-5/0.00/0.0/.../..           25 WNW AERO 24 WNW RMY 27
3/18 36/24/30/-6/0.00/0.0/.../..           26 ENE AERO 24 ENE RMY 26
3/19 35/28/32/-4/0.01/T/.../..             39 N   AERO 37 N   RMY 39
3/20 49/29/39/+2/0.00/0.0/.../..           31 N   AERO 35 N   RMY 36
3/21 52/34/43/+6/0.00/0.0/.../..           28 W   AERO 26 W   RMY N/A
3/22 38/15/27/-10/T/T/.../..               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 Low temp since midnight is 13F; normal low is now 29F

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 24
HIGH 70 IN 1920
LOW 6 IN 1906
PRECIP 1.51 INS. IN 1956
SNOWFALL 12.3 INS. IN 1956
PEAK GUST 71 MPH W IN 1968

RECORDS FOR MARCH 25
HIGH 76 IN 1910
LOW 8 IN 1888, 1956
PRECIP 1.84 INS. IN 1909
SNOWFALL 1.0 INS. IN 1912
PEAK GUST 69 MPH SE IN 1969

TODAY'S REPORT PREPARED BY: Kaitlin Geagan