Tuesday, August 28, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, AUGUST 28, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

A HOT AND BREEZY DAY ON TOP OF GREAT BLUE HILL….

The visibility increased slightly as the day went on, rising
from 20 miles at our first and second observations to
30 miles by our third observation, as humidity and haze
decreased. Humidity went from 85% this morning to
57% by 1 P.M. The daily record high temperature is 95F,
set in 1948. So far today we have reached a high of 92F
by 1 P.M. This is 15 degrees warmer than our normal
daily average of 77F. Winds from the WSW were moderate today,
with a couple of gusts of 20 kts (23 MPH).

Today’s Observations:

7 A.M.
Weather: Scattered cirrostratus, few altocumulus WSW-NE,
patches of cirrocumulus in all directions
Temperature: 76F; Dew Point: 71F; Wind: WSW at 7G12 kts
Sea-level pressure: 30.02 ins. Hg, rising then falling
Visibility: 20 miles, haze aloft
6-hr Max temp: 76F
6-hr Min temp: 72F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 20 167/76/71/2407G12/002/ FEW AC WSW-NE
PTCHS CC ALQDS HZ ALF/ 8/039 50002 10076 20072

10 A.M.
Weather: Clear, few altocumulus E-S, few cirrostratus WSW-ENE
Temperature: 86F; Dew Point: 74F; Wind: W at 6G13 kts
Wind: Light
Sea-level pressure: 30.03 ins. Hg, falling unsteadily
Visibility: 20 miles, haze aloft
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 20 169/86/74/2806G13/003/ FEW AC E-S
FEW CS WSW-ENE HZ ALF WND LGT/ 8/058 53002

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 86F; Dew Point: 66F; Wind: WSW at 10G17 kts,
Sea-level pressure: 29.98 ins. Hg, falling, then more slowly
Visibility: 30 miles, haze aloft
6-hr Max temp: 92F
6-hr Min temp: 76F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 300 SCT 30 154/91/73/2510G17/998/
HZ ALF/ 8/101 56015 10092 20076

SUMMARY FOR MONDAY, AUGUST 27, 2018

TEMPERATURE (DEGREES F)
MAX…..86   NORMAL…..78
MIN…..67   NORMAL…..60
MEAN….77   NORMAL…..69

DEPARTURE FROM 30-YEAR NORMAL…………………….+8
TOTAL DEPARTURE FOR THE MONTH……………………+87 [+3.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..12  DEPARTURE……….+7
TOTAL COOLING UNITS FOR THE MONTH………….246  DEPARTURE………+77
TOTAL COOLING UNITS FOR THE SEASON…………701  DEPARTURE……..+181
TOTAL COOLING UNITS LAST SEASON TO DATE…….605  DEPARTURE………+96

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………21 WNW AT  4:45 A.M.
AERO……………………..18 WNW AT  4:46 A.M.
ASOS……………………..20 WNW AT  4:46 A.M.
DAVIS…………………….20 M   AT  4:46 A.M.** RMY 18
FASTEST MILE FOR YESTERDAY…………………..14 WNW AT  4:44 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..15 WNW AT  4:46 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….15 M   AT  4:46 A.M.**
AVERAGE WIND SPEED AND DIRECTION…………….8.9 W
ASOS…………………….8.3
DAVIS……………………8.9 M**
** DAVIS DIRECTION MALFUNCTIONING

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.11
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.95  DEPARTURE……+0.36
ASOS…………..3.94
TOTAL PRECIPITATION FOR THE YEAR……….37.96  DEPARTURE……+3.56
ASOS………….39.52

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/+8/0.70/460/54        25 SSW AERO 25 SSW RMY N/A TSTM
8/9  86/70/78/+6/0.07/509/60        29 SW  AERO 28 SW  RMY N/A TSTM
8/10 85/66/76/+5/T/651/77           17 NW  AERO 16 NW  RMY N/A
8/11 70/66/68/-3/…./000/00        18 SE  AERO 17 SE  RMY 18
8/12 73/66/70/-1/…./000/00        23 NNE AERO 18 NNE RMY 21
8/13 69/64/67/-4/0.17/000/00        23 ENE AERO 21 ENE RMY 21
8/14 83/69/76/+5/0.00/502/60        25 S   AERO 23 S   RMY 24
8/15 86/68/77/+6/0.00/509/61        20 W   AERO 17 W   RMY 19
8/16 87/70/79/+8/0.00/515/62        20 W   AERO 18 W   RMY 20
8/17 83/67/75/+4/…./531/64        23 SSW AERO 23 SSW RMY N/A
8/18 83/63/73/+2/…./165/20        31 NE  AERO 30 NE  RMY 33 TSTM
8/19 68/62/65/-5/…./527/64        30 NE  AERO 30 NE  RMY 32
8/20 72/61/67/-3/0.00/591/72        28 ENE AERO 25 ENE RMY 27
8/21 69/61/65/-5/T/155/19           20 ESE AERO 17 ESE RMY N/A
8/22 82/62/72/+2/…./326/40        35 WNW AERO 35 WNW RMY 35
8/23 76/60/68/-2/…./…/..        25 NW  AERO 23 NW  RMY 27
8/24 82/59/71/+1/0.00/…/..        20 SSE AERO 18 SSE RMY 20
8/25 80/59/70/+1/0.00/…/..        20 S   AERO 18 S   RMY 20
8/26 81/59/70/+1/0.00/…/..        21 SSW AERO 20 SSW RMY 21
8/27 86/67/77/+8/0.00/…/..        21 WNW AERO 18 WNW RMY 18

8/28 Low temp since midnight is 72F; normal low is now 60F

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 28
HIGH 95F IN 1948
LOW 43F IN 1885
PRECIP 1.80 INCHES IN 1922
PEAK GUST 87 MPH SSE IN 1971 (DORIA)

RECORDS FOR AUGUST 29
HIGH 95F IN 1953
LOW 41F IN 1982
PRECIP 2.88 INCHES IN 1962
PEAK GUST 70e MPH S IN 1949

TODAY’S REPORT PREPARED BY: Samantha Richard/ Kaitlin Geagan