Friday, August 24, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, AUGUST 24, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

TEMPERATURES QUICKLY RISE AFTER WIND SHIFTED FROM
THE NORTHWEST TO THE SOUTH…

The day began with below normal temperatures with an
overnight minimum of 59F, this is 2 degrees below
the daily low minimum of 61F. Once the wind shifted
mid-day temperatures quickly rose, and we recorded a
maximum temperature so far of 81F, which is 3 degrees
above the daily normal of 78F. Humidity has been low
today making for dry comfortable air throughout the
day. The wind shifted around 10:00 A.M. today. The
day began with wind coming from the NW and is now
coming from the south. The wind was also light and
variable right around the time the wind shifted and
has remained on the lighter end but did increase
after the wind shift.
We had haze aloft in the area today mostly from the
smoke produced by fires in Western U.S. and Canada.
Visibility decreased from 40 miles in the morning to
30 miles in the afternoon. The skies remained clear
today with a few cumulus clouds developing in the
afternoon.

Today’s Observations:

7 A.M.
Weather: Clear, few cirrostratus in all directions
Temperature: 64F; Dew Point: 54F; Wind: W at 9G12 kts
Sea-level pressure: 30.17 ins. Hg, rising, then more rapidly
Visibility: 40 miles, haze aloft
6-hr Max temp: 64F
6-hr Min temp: 59F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 40 217/64/54/2809G12/017/ FEW CS
ALQDS HZ ALF/ 8/005 53017 10064 20059

10 A.M.
Weather: Clear
Temperature: 74F; Dew Point: 58F; Wind: SW at 3 kts,
Wind: Light and Variable, direction estimated
Sea-level pressure: 30.22 ins. Hg, rising, then more slowly
Visibility: 40 miles, haze aloft
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 40 232/74/58/E2303/022/ HZ ALF WND L/V/
51015

1 P.M.
Weather: Clear, few cumulus NE-N
Temperature: 81F; Dew Point: 58F; Wind: SW at 6G12 kts,
Wind: Light
Sea-level pressure: 30.21 ins. Hg, rising then steady
Visibility: 30 miles, haze aloft
6-hr Max temp: 81F
6-hr Min temp: 63F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 30 230/81/58/2206G12/021/ FEW CU NE-N
HZ ALF WND LGT/ 8/100 56002 10081 20063

SUMMARY FOR THURSDAY, AUGUST 23, 2018

TEMPERATURE (DEGREES F)
MAX…..76   NORMAL…..78
MIN…..60   NORMAL…..61
MEAN….68   NORMAL…..70

DEPARTURE FROM 30-YEAR NORMAL…………………….-2
TOTAL DEPARTURE FOR THE MONTH……………………+75 [+3.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………3  DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE MONTH………….218  DEPARTURE………+69
TOTAL COOLING UNITS FOR THE SEASON…………673  DEPARTURE……..+173
TOTAL COOLING UNITS LAST SEASON TO DATE…….599  DEPARTURE………+74

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………25 NW AT  1:29 P.M.*
AERO……………………..23 NW AT  1:28 P.M.*
ASOS……………………..25 NW AT  9:30 A.M.
DAVIS…………………….25 M  AT  9:29 A.M.** RMY 27
FASTEST MILE FOR YESTERDAY…………………..17 NW AT  9:30 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..17 NW AT  3:25 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….19 M  AT 10:13 A.M.**
AVERAGE WIND SPEED AND DIRECTION……………10.5 NW
ASOS……………………10.4
DAVIS…………………..10.1 M**
* LAST OF MULTIPLE
** DAVIS DIRECTION MALFUNCTIONING

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.95  DEPARTURE……+0.982
ASOS…………..3.94
TOTAL PRECIPITATION FOR THE YEAR……….37.96  DEPARTURE……+4.02
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/…/..        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 68/62/65/-5/…./…/..        30 NE  AERO 30 NE  RMY 32
8/20 72/61/67/-3/0.00/…/..        28 ENE AERO 25 ENE RMY 27
8/21 69/61/65/-5/T/…/..           20 ESE AERO 17 ESE RMY N/A
8/22 82/62/72/+2/…./…/..        35 WNW AERO 35 WNW RMY 35
8/23 76/60/68/-2/…./…/..        25 NW  AERO 23 NW  RMY 27

8/24 Low temp since midnight is 59F; normal low is now 61F

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 24
HIGH 92F IN 1947
LOW 43F IN 1971
PRECIP 2.40 INCHES IN 2010
PEAK GUST 54 MPH W IN 1986

RECORDS FOR AUGUST 25
HIGH 93F IN 1947, 1948, 2007
LOW 41F IN 1940
PRECIP 2.69 INCHES IN 2010
PEAK GUST 60e MPH SSW IN 1941

TODAY’S REPORT PREPARED BY: Kaitlin Geagan