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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, NOVEMBER 10, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

STRONG WIND FROM THE WEST-NORTHWEST BRINGS 
COLD DRY AIR TO GREAT BLUE HILL...

Winds shifted from the south-southeast to west-northwest 
this morning just before 6:00 A.M. EST. Before the wind 
shift temperatures were in the 40's with a high of 45F 
at 4:00 A.M. EST. Once the wind shifted temperatures began 
to drop with a low of 33F by 1:00 P.M. EST. Along with 
temperature changes we also saw wind increase after the 
wind shift. We have had a peak gust of 40 kts (46 MPH) 
by 1:00 PM, with frequent gust over 30 kts (35 MPH). 
Humidity dramatically dropped all the way down to 24%
by 1:00 P.M. EST. This allowed for perfect visibility
at 90 miles by 1:00 P.M. EST. 

Today's Observations:

7 A.M.
Weather: Scattered altocumulus, few cumulus in all
directions 
Temperature: 39F; Dew Point: 28F; Wind: WNW at 16G28 kts,
Peak Wind: 28 kts (32 MPH) WNW at 6:32 A.M. EST
Sea-level pressure: 29.93 ins. Hg, rising, then more rapidly  
Visibility: 70 miles
6-hr Max temp: 45F
6-hr Min temp: 39F
24-hr precip: 0.01 inches 
BHO SA 1155 70 SCT 70 137/39/28/2916G28/993/ FEW CU ALQDS 
PK WND 2735/32/ 8/160 53027 MANUAL 70001 10045 20039 

10 A.M.
Weather: Scattered cumulus 
Temperature: 37F; Dew Point: 19F; Wind: WNW at 22G32 kts,
Peak Wind: 32 kts (37 MPH) at 9:47 A.M. EST 
Sea-level pressure: 30.01 ins. Hg, falling, then more slowly
Visibility: 80 miles  
BHO SA 1455 50 SCT 80 162/37/19/3022G32/001/ PK WND 3032/47/ 
8/100 51025 

1 P.M.
Weather: Scattered cirrus, few distant cumulus W-S
Temperature: 34F; Dew Point: 0F; Wind: WNE at 19G34 kts,
Peak Wind: 34 kts (39 MPH) at 12:52 P.M. EST
Sea-level pressure: 30.07 ins. Hg, rising, then more slowly
Visibility: 90 miles  
6-hr Max temp: 39F
6-hr Min temp: 33F
BHO SA 1755 250 SCT 90 184/34/00/3019G34/007/ FEW CU DSNT W-S 
PK WND 3034/52/ 8/101 51022 10039 20033 

SUMMARY FOR THURSDAY, NOVEMBER 9, 2017
 
TEMPERATURE (DEGREES F)
MAX.....50   NORMAL.....52
MIN.....31   NORMAL.....35
MEAN....41   NORMAL.....44

DEPARTURE FROM 30-YEAR NORMAL.........................-3
TOTAL DEPARTURE FOR THE MONTH........................+37 [+3.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............24   DEPARTURE...........3
TOTAL HEATING UNITS FOR THE MONTH.............140   DEPARTURE.........-39
TOTAL HEATING UNITS FOR THE SEASON............408   DEPARTURE........-334
TOTAL HEATING UNITS LAST SEASON TO DATE.......574   DIFFERENCE.......-166

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................25 S  AT 11:53 A.M. 
                   AERO........................23 S  AT 11:53 A.M.
                   ASOS........................27 S  AT 11:55 A.M.
                   DAVIS.......................25 S  AT 11:54 A.M.  RMY 27
FASTEST MILE FOR YESTERDAY.....................18 S  AT 11:53 A.M.    
MAXIMUM 2-MINUTE ASOS AVERAGE..................20 S  AT 11:55 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................17 S  AT 11:55 A.M.
AVERAGE WIND SPEED AND DIRECTION..............8.6 N
                   ASOS.......................9.4
                   DAVIS......................8.3 E    [103 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE......-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.26  DEPARTURE......-1.14 
                         ASOS..............0.24
TOTAL PRECIPITATION FOR THE YEAR..........48.06  DEPARTURE......+2.89
                         ASOS...............N/A ***
*** ASOS annual total not available due to erroneous readings 

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

11/1 53/39/46/0/0.00/.../..               25 SE  AERO 24 SE  RMY 25
11/2 71/49/60/+14/0.00/.../..             28 SSE AERO 25 SSE RMY 27
11/3 74/47/61/+15/T/.../..                35 WNW AERO 35 WNW RMY 38 
11/4 54/39/47/+2/0.00/.../..              31 NW  AERO 31 NW  RMY N/A 
11/5 61/46/54/+9/0.01/.../..              26 S   AERO 24 S   RMY N/A
11/6 64/47/56/+11/0.05/.../..             32 S   AERO 28 SSW RMY 35
11/7 46/35/41/-4/.../.../..               26 NNW AERO 23 N   RMY 26
11/8 43/34/39/-5/.../.../..               26 N   AERO 23 N   RMY 27 
11/9 50/31/41/-3/.../.../..               25 S   AERO 23 S   RMY N/A 

11/10 Low temp since midnight is 39F; normal low is now 35F

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

RECORDS FOR NOVEMBER 10
HIGH 75 IN 1931
LOW 20 IN 2004
PRECIP 2.11 INCHES IN 1888
SNOWFALL 2.2 IN 1987
PEAK GUST 83e S IN 1942

RECORDS FOR NOVEMBER 11
HIGH 68 IN 1984
LOW 17 IN 1956
PRECIP 1.14 INCHES IN 1991
SNOWFALL 2.5 IN 1986
PEAK GUST 64 NW IN 1962

TODAY'S REPORT PREPARED BY: Kaitlin Geagan