Wednesday, August 9, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, AUGUST 9, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

WARMER AND DRIER WITH SUNNY SKIES

Yesterday had below normal temperatures, with a minimum of 60F
occurring around 6:00 A.M. EST and a maximum of 74F around
2:00 P.M. The average temperature for the day was about 5F below
normal. The cumulative departure for the month of August is -4F,
or -0.7 degrees per day. Today’s maximum temperature has already
gotten up to 82F, which is 2F above the normal maximum temperature
of 80F. Not only has it been warmer, but it has been drier as well
with dew points in the mid to upper 50s. At the 1:00 P.M. observation,
the relative humidity was at 41%. There have been very few clouds,
so the skies have been clear and sunny all day. Visibility started
out good in the morning at 70 miles, but it progressively worsened
down to 40 miles at 1:00 P.M. despite the lower humidity.

Today’s Observations:

7 A.M.
Weather: Clear, few distant altocumulus ENE-SSW
Temperature: 62F; Dew Point: 57F; Wind: WNW at 7 kts
Sea-level pressure: 30.17 ins. Hg, rising, then less quickly
Visibility: 70 miles, distant fog in all directions
6-hr Max temp: 62F
6-hr Min temp: 58F
24-hr precip: Trace
BHO SA 1155 CLR 70 216/62/57/3007/017/ FEW AC DSNT ENE-SSW
DSNT FG ALQDS/ 8/030 51018 10062 20058

10 A.M.
Weather: Clear, few cumulus E-SE, few distant altocumulus ESE-SSW
Temperature: 76F; Dew Point: 57F; Wind: WNW at 7 kts
Sea-level pressure: 30.19 ins. Hg, rising, steady
Visibility: 50 miles
BHO SA 1455 CLR 50 224/76/57/2907/019/ FEW CU E-SE FEW AC DSNT
ESE-SSW/ 8/130 51008

1 P.M.
Weather: Clear, few cumulus SSW-NE, few distant altocumulus ESE-S
Temperature: 81F; Dew Point: 55F; Wind: W at 5 kts,
Wind speed: Light
Sea-level pressure: 30.18 ins. Hg, falling, then more quickly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 82F
6-hr Min temp: 62F
BHO SA 1755 CLR 40 219/81/55/2605/018/ FEW CU SSW-NE FEW AC
DSNT ESE-S DSNT HZ ALQDS WND LGT/ 8/130 58005 10082 20062

SUMMARY FOR TUESDAY, AUGUST 8, 2017

TEMPERATURE (DEGREES F)
MAX…..74   NORMAL…..80
MIN…..60   NORMAL…..63
MEAN….67   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………….-5
TOTAL DEPARTURE FOR THE MONTH…………………….-4 [-0.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE……….-4
TOTAL COOLING UNITS FOR THE MONTH…………..52   DEPARTURE……….-5
TOTAL COOLING UNITS FOR THE SEASON…………473   DEPARTURE………+65
TOTAL COOLING UNITS LAST SEASON TO DATE…….540   DEPARTURE………-67

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….17 S   AT 10:22 P.M.
AERO……………………16 SSE AT  8:58 P.M.
ASOS……………………18 S   AT 10:21 P.M.
DAVIS…………………..16 SSE AT  9:25 P.M. RMY 29
FASTEST MILE FOR YESTERDAY…………………12 SSE AT 10:00 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………13 SSE AT  8:59 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..12 SSE AT  8:59 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.5 ENE
ASOS…………………..7.0
DAVIS………………….5.2 E [93 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…TRACE  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.22  DEPARTURE……+0.04
ASOS…………..1.22
TOTAL PRECIPITATION FOR THE YEAR……….35.98  DEPARTURE……+3.81
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/1  87/65/76/+4/0.00/…/..               16 ESE*AERO 16 NNW RMY 16
8/2  86/65/76/+4/1.09/…/..               32 W   AERO 36 W   RMY 34 TSTM
8/3  83/65/74/+2/0.00/…/..               22 S   AERO 23 S   RMY 24
8/4  84/66/75/+3/0.00/…/..               26 S   AERO 30 S   RMY 29
8/5  75/63/69/-3/0.10/…/..               23 NW  AERO 28 NW  RMY 29
8/6  76/57/67/-5/0.00/…/..               30 NW  AERO 32 NW  RMY 31
8/7  76/60/68/-4/…./…/..               28 SSW AERO 28 SSW RMY 29
8/8  74/60/67/-5/…./…/..               17 S   AERO 16 SSE RMY 16

8/9  Low temp since midnight is 58F; normal low is now 63F

DAILY RECORDS FOR AUGUST

None so far.

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

RECORDS FOR AUGUST 9
HIGH 100F IN 1949
LOW 49F IN 1899
PRE 2.65 INS IN 1976
PEAK GUST 90 MPH SW IN 1968

RECORDS FOR AUGUST 10
HIGH 101F IN 1949 [STATION RECORD MAXIMUM – Tied with 8/2/1975] LOW 49F IN 1964
PRE 2.27 INS IN 1952
PEAK GUST 88e MPH S IN 1976

TODAY’S REPORT PREPARED BY: Lizzy Suzedell