Sunday, August 19, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, AUGUST 19, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL, OVERCAST AND BREEZY DAY ATOP GREAT BLUE HILL….

We observed an increase in visibility since this morning,
from 40 miles at 7 A.M. to 70 miles at 1 P.M. Wind remained
moderate and northerly throughout the day, with frequent
gusts over 20 mph. We measured a half inch of rain this
morning, bringing the monthly precipitation departure
up to +1.04 inches. The annual rainfall departure has
increased to +4.24 inches. Temperatures stayed cool and
varied little today. The maximum so far is 68F, 11 degrees
less than the daily normal.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus, broken cirrus
Temperature: 65F; Dew Point: 60F; Wind: ENE at 13G23 kts
Sea-level pressure: 29.98 ins. Hg, rising steadily
Visibility: 40 miles
6-hr Max temp: 65F
6-hr Min temp: 62F
24-hr Precip: 0.50 ins.
BHO SA 1155 E110 BKN 250 BKN 40 153/65/60/0613G23/998/
8/062 53019 70050 10065 20062

10 A.M.
Weather: Broken altocumulus, broken cirrostratus
Temperature: 66F; Dew Point: 62F; Wind: N at 13G25 kts,
Sea-level pressure: 30.03 ins. Hg, rising steadily
Visibility: 45 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E22 BKN 250 BKN 45 170/66/62/0113G25/003/ 8/408 53017

1 P.M.
Weather: Broken cumulus, overcast cirrostratus
Temperature: 66F; Dew Point: 59F; Wind: NE at 12G24 kts
Sea-level pressure: 30.02 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 68F
6-hr Min temp: 65F
6-hr Precip: 0.00 ins.
BHO SA 1755 E27 BKN 250 OVC 70 172/66/59/0512G24/004/ BINOVC ALQDS/
8/408 52003 10068 20065

SUMMARY FOR SATURDAY, AUGUST 18, 2018

TEMPERATURE (DEGREES F)
MAX…..83   NORMAL…..79
MIN…..63   NORMAL…..62
MEAN….73   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL…………………….+2
TOTAL DEPARTURE FOR THE MONTH……………………+89 [+4.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………8  DEPARTURE……….+2
TOTAL COOLING UNITS FOR THE MONTH………….206  DEPARTURE………+85
TOTAL COOLING UNITS FOR THE SEASON…………661  DEPARTURE……..+189
TOTAL COOLING UNITS LAST SEASON TO DATE…….548  DEPARTURE……..+115

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………31 NE  AT 10:40 P.M.
AERO……………………..30 NE  AT 10:13 P.M.
ASOS……………………..32 ENE AT 10:15 P.M.
DAVIS…………………….31 NE  AT  8:07 P.M. RMY 33
FASTEST MILE FOR YESTERDAY…………………..24 NE  AT  8:06 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..22 ENE AT  9:44 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….22 N   AT  8:07 P.M.
AVERAGE WIND SPEED AND DIRECTION……………10.7 NE
ASOS……………………10.7
DAVIS…………………..10.8 W [274 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.50  DEPARTURE……+0.37
ASOS…………..0.48
TOTAL PRECIPITATION FOR THE MONTH……….3.53  DEPARTURE……+1.04
ASOS…………..3.52
TOTAL PRECIPITATION FOR THE YEAR……….37.54  DEPARTURE……+4.24
ASOS………….39.10

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  82/66/74/+2/T/199/23           31 S   AERO 30 S   RMY 31
8/2  92/74/83/+11/0.00/761/88       30 SW  AERO 28 SW  RMY 31
8/3  88/74/81/+9/0.19/492/57        35 NW  AERO 32 NW  RMY 35 TSTM
8/4  82/69/76/+4/1.16/301/35        28 SW  AERO 25 SW  RMY 30 TSTM
8/5  89/66/78/+6/0.00/815/95        20 W   AERO 18 W   RMY 19
8/6  92/71/82/+10/0.00/822/96       20 W   AERO 16 WSW RMY N/A
8/7  92/73/83/+11/0.00/682/80       25 S   AERO 23 S   RMY 26
8/8  88/71/80/+8/0.70/…/..        25 SSW AERO 25 SSW RMY N/A TSTM
8/9  86/70/78/+6/0.07/…/..        29 SW  AERO 28 SW  RMY N/A TSTM
8/10 85/66/76/+5/T/…/..           17 NW  AERO 16 NW  RMY N/A
8/11 70/66/68/-3/…./…/..        18 SE  AERO 17 SE  RMY 18
8/12 73/66/70/-1/…./…/..        23 NNE AERO 18 NNE RMY 21
8/13 69/64/67/-4/0.17/…/..        23 ENE AERO 21 ENE RMY 21
8/14 83/69/76/+5/0.00/…/..        25 S   AERO 23 S   RMY 24
8/15 86/68/77/+6/0.00/…/..        20 W   AERO 17 W   RMY 19
8/16 87/70/79/+8/0.00/…/..        20 W   AERO 18 W   RMY 20
8/17 83/67/75/+4/…./…/..        23 SSW AERO 23 SSW RMY N/A
8/18 83/63/73/+2/…./…/..        31 NE  AERO 30 NE  RMY 33 TSTM

8/19 Low temp since midnight is 62F; normal low is now 62F

DAILY RECORDS FOR AUGUST 2018

08/03/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F,
BREAKS PREVIOUS RECORD OF 71F SET IN 1928, 1969, AND 1979

08/07/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1988

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

RECORDS FOR AUGUST 19
HIGH 90F IN 1906, 1966, 2002
LOW 48F IN 1958
PRECIP 7.02 INCHES IN 1955 [DIANE – RECORD FOR MONTH] PEAK GUST 78 MPH ENE IN 1991 – HURRICANE BOB

RECORDS FOR AUGUST 20
HIGH 93F IN 1937
LOW 48F IN 1896, 1905, 1949
PRECIP 2.71 INCHES IN 1970
PEAK GUST 47 MPH W IN 1983

TODAY’S REPORT PREPARED BY: Samantha Richard and Ben Turner