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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 11, 2018 
ALL TIMES ARE IN EASTERN STANDARD TIME

EARLY MORNING THUNDERSTORMS AND WIND FROM THE NE
BRING COOLER TEMPERATURES TO GREAT BLUE HILL...

Thunderstorms began early this morning with a strong 
band moving through around 4:30 A.M. We had moderate
wind gusts during this time with a peak of 28 MPH at
4:26 A.M. Rain was heavy at times and we measured a
storm total of 0.73 ins. 
The wind yesterday was mostly coming from the west
yesterday shifted overnight and its now coming 
from the NE. This has brought cooler drier air into
the area with a max so far of 72F. This is 19 degrees
below the high temperature of 91F and 9 degrees below
the daily normal of 81F.
The wind has been moderate today as the pressure rises
from the thunderstorm. So far we have had a peak gust
of 26 MPH (23 kts) and frequent gust over 25 MPH 
(22 kts).
The sky was mostly cloudy today with a mixture of 
altocumulus clouds throughout the day. Visibility was
limited to 40-45 miles today due to a distant haze.   

Today's Observations:

7 A.M.
Weather: Scattered altocumulus castallanus, broken
altocumulus, broken altostratus, few cumulus distant
W-N, patches of ground fog ENE and SW 
Temperature: 65F; Dew Point: 61F; Wind: NNE at 10G17 kts
Sea-level pressure: 29.95 ins. Hg, rising, then more quickly 
Visibility: 45 miles, distant fog in all directions
6-hr Max temp: 68F
6-hr Min temp: 63F
24-hr Precip: 0.73 ins.  
BHO SA 1155 70 SCT E90 BKN E120 BKN 45 141/65/61/0310G17/995/ 
FEW CU DSNT W-N PTCHS GF ENE AND SW DSNT FG ALQDS/ 8/180 55011 
MANUAL 70073 10068 20063 

10 A.M.
Weather: Scattered altocumulus, few cumulus distant
along the horizon ENE-WNW, few altocumulus standing 
lenticular WNW
Temperature: 70F; Dew Point: 58F; Wind: NE at 14G22 kts
Sea-level pressure: 30.00 ins. Hg, rising, then more quickly 
Visibility: 45 miles, distant haze in all directions 
3-hr Precip: 0.00 ins. 
BHO SA 1455 90 SCT 45 159/70/58/0514G22/000/ FEW CU DSNT ALNG 
HRZN ENE-WNW FEW ACSL WNW DSNT HZ ALQDS/ 8/180 53018

1 P.M.
Weather: Scattered altocumulus, Broken altostratus, 
few cumulus distant E-NNE
Temperature: 70F; Dew Point: 54F; Wind: ENE at 10G18 kts
Sea-level pressure: 30.00 ins. Hg, falling the rising   
Visibility: 40 miles, distant haze in all directions 
6-hr Max temp: 72F
6-hr Min temp: 65F
6-hr precip: 0.00 ins. 
BHO SA 1755 70 SCT E200 BKN 40 159/70/54/0710G18/000/ FEW 
CU DSNT E-NNE DSNT HZ ALQDS/ 8/190 52000 10072 20065

SUMMARY FOR TUESDAY, JULY 10, 2018 

TEMPERATURE (DEGREES F)
MAX.....91   NORMAL.....81
MIN.....63   NORMAL.....63
MEAN....77   NORMAL.....72

DEPARTURE FROM 30-YEAR NORMAL.........................+5
TOTAL DEPARTURE FOR THE MONTH........................+53 [+5.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY..............12   DEPARTURE..........+5
TOTAL COOLING UNITS FOR THE MONTH.............114   DEPARTURE.........+50
TOTAL COOLING UNITS FOR THE SEASON............273   DEPARTURE.........+80
TOTAL COOLING UNITS LAST SEASON TO DATE.......281   DEPARTURE..........-8

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................24 W   AT 12:44 P.M.
                   AERO.........................22 W   AT  3:43 P.M.
                   ASOS..........................M ***
                   DAVIS........................26 WNW AT 2:04 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY......................17 W   AT 2:07 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE....................M ***
MAXIMUM 2-MINUTE DAVIS AVERAGE..................19 W   AT 4:00 P.M. ***
AVERAGE WIND SPEED AND DIRECTION...............9.6 WSW
                   ASOS..........................M ***
                   DAVIS.......................9.9

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.73  DEPARTURE......+0.60
                         ASOS..............0.00***
TOTAL PRECIPITATION FOR THE MONTH..........1.29  DEPARTURE......+0.17
                         ASOS..............0.00***  
TOTAL PRECIPITATION FOR THE YEAR..........30.73  DEPARTURE......+3.55
                         ASOS.............31.73***

***ASOS system down due to lightning storm

PRELIMINARY CLIMATE SUMMARY FOR JULY 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

7/01 94/72/83/+13/0.00/.../..       21 ESE AERO 18 ESE RMY 19 
7/02 90/68/79/+9/0.00/.../..        21 S   AERO 21 S   RMY 22
7/03 94/69/82/+11/0.00/.../..       20 SSW AERO 18 SW  RMY 19 TSTM
7/04 89/73/81/+10/0.00/.../..       17 NE  AERO 15 NE  RMY 16
7/05 91/73/82/+11/0.00/.../..       29 SSW AERO 28 SSW RMY N/A
7/06 80/59/70/-1/0.56/.../..        37 NNW AERO 38 SW  RMY 40 TSTM
7/07 78/54/66/-5/0.00/.../..        22 N   AERO 18 N   RMY N/A 
7/08 83/57/70/-2/0.00/.../..        23 S   AERO 21 S   RMY 22  
7/09 88/60/74/+2/0.00/.../..        23 SW  AERO 23 SW  RMY 24 
7/10 91/63/77/+5/..../.../..        24 W   AERO 22 W   RMY N/A

7/11 Low temp since midnight is 63F; normal low is now 63F

DAILY RECORDS FOR JULY 2018

07/01/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F, 
          TIES PREVIOUS RECORD OF 72F SET IN 1968

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

RECORDS FOR JULY 11
HIGH 98F IN 1911
LOW 49F IN 1890
PRECIP 1.87 INS IN 1959
WIND 53 MPH NW IN 1988

RECORDS FOR JULY 12
HIGH 97F IN 1943
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944

TODAY'S REPORT PREPARED BY: Kaitlin Geagan