Thursday, August 15, 2019

| August 15, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, AUGUST 15, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY EARLY MORNING MAKING WAY FOR A BEAUTIFUL AFTERNOON…

Today began with visibility at less than an eighth of
a mile. By late morning, humidity dropped, and the
fog lifted, leaving for clear conditions at the 10
and 1 o’clock observations. With haze still lingering
and distant fog at the 10 o’clock observation, visibility
was limited to 40 miles. by 1 o’clock, the fog and haze
lifted, leaving for a nice 70 mile visibility. A high of
76F so far was observed, which is 4 degrees below our
maximum temperature of 80F.

PRELIMINARY STATS FOR JULY 2019

TEMPERATURE, Deg. F
Avg. Max. 84.6 [+3.8]
Avg. Min. 65.6 [+2.7]
Mean      75.1 [+3.2]
24-hour corrected mean: 74.5
Max. for month: 93F on the 20th, 30th
Min. for month: 58F on the 1st, 23rd

COOLING DEGREE DAYS
Total cooling units:   322 [+100]
Total for the season:  411 [+60]
Total for last season: 455

PRECIPITATION, Inches
Total: 5.45 [+1.43]
Greatest in 24 hrs: 2.08 22nd-23rd

WIND, mph
Avg. uncorrected wind speed: 8.8
Avg. corrected wind speed:   9.6
Prevailing wind direction: W at 14%
Peak gust and direction: 44 W on 17th

SUNSHINE:
Campbell-Stokes card minutes: 18300 minutes of possible 26682 or 69%
Astronomical total minutes: 19049 minutes of possible 27759 or 69%

Today’s Observations:

7 A.M.
Weather: Fog
Temperature: 60F; Dew Point: 60F; Wind: ENE at 5 kts,
Wind: light
Sea-level pressure: 30.03 ins. Hg, rising, then more quickly
Visibility: 1/8 mile
6-hr Max temp: 62F
6-hr Min temp: 59F
24-hr Precip: 0.02 ins.
BHO SA 1155 W3 X 1/8F 171/60/60/0605/003/ WND LGT/ 8//// 53014
70002 10062 20059

10 A.M.
Weather: Clear, few altocumulus NE-SSW
Temperature: 70F; Dew Point: 61F; Wind: ENE at 6 kts
Sea-level pressure: 30.07 ins. Hg, rising steadily
Visibility: 40 miles, hazy, distant fog SW-NE
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 40 184/70/61/0506/007/ FEW AC NE-SSW DSNT FOG
SW-NE HAZY/ 8/050 52013

1 P.M.
Weather: Clear, Few cumulus WNW-ENE, Few cirrus overhead
Temperature: 76F; Dew Point: 61F; Wind: ENE at 6 kts
Sea-level pressure: 29.87 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 76F
6-hr Min temp: 60F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 70 175/76/61/0506/005/ FEW CU WNW-ENE
FEW CI OVHD/ 8/101 58009 10076 20060

SUMMARY FOR WEDNESDAY, AUGUST 14, 2019

TEMPERATURE (DEGREES F)
MAX…..75   NORMAL…..80
MIN…..62   NORMAL…..62
MEAN….69   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL………………….-2
TOTAL DEPARTURE FOR THE MONTH………………….+6 [+0.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………4   DEPARTURE………-2
TOTAL COOLING UNITS FOR THE MONTH…………..99   DEPARTURE………+2
TOTAL COOLING UNITS FOR THE SEASON…………510   DEPARTURE……..+62
TOTAL COOLING UNITS LAST SEASON TO DATE…….617   DEPARTURE…….-107

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..24 ENE AT 7:18 A.M.
AERO…………………….22 ENE AT 5:39 A.M.
ASOS…………………….25 NE  AT 5:11 A.M.
DAVIS……………………23 NE  AT 4:13 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….18 ENE AT 5:36 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 NE  AT 5:37 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………18 NE  AT 5:37 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.8 ENE
ASOS…………………..9.1
DAVIS………………….9.4 ENE [59 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.02  DEPARTURE……-0.11
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.82  DEPARTURE……-1.16
ASOS…………..0.82
TOTAL PRECIPITATION FOR THE YEAR……….36.14  DEPARTURE……+3.17
ASOS………….36.10

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

07/01 83/58/71/+1/0.00/896/98               21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/329/36               23 W   AERO 23 W   RMY 23
07/03 89/67/78/+7/0.00/866/95               18 S   AERO 18 S   RMY 18
07/04 88/68/78/+7/0.00/748/82               17 SSW AERO M  M   RMY 17
07/05 87/69/78/+7/0.00/829/91               21 SW  AERO M  M   RMY 21
07/06 90/71/81/+10/0.83/646/71              26 WNW AERO M  M   RMY N/A TSTM
07/07 78/64/71/0/0.00/827/91                30 NE  AERO M  M   RMY N/A
07/08 79/59/69/-3/0.00/763/84               16 N   AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/871/96               18 NW  AERO 16 NW  RMY 18
07/10 88/69/79/+7/0.00/607/67               20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/0.62/000/00               35 S   AERO 33 S   RMY 36
07/12 84/68/76/+4/0.00/316/35               31 WNW AERO 30 WNW RMY 32
07/13 85/65/75/+3/0.00/812/90               21 W   AERO 20 WSW RMY 20
07/14 87/68/78/+6/0.00/702/78               25 W   AERO 21 W   RMY 23
07/15 82/63/73/+1/0.00/791/88               24 WNW AERO 23 WNW RMY 22
07/16 86/65/76/+4/0.00/682/76               23 W   AERO 21 W   RMY 21
07/17 90/70/80/+8/1.32/260/29               44 W   AERO M  M   RMY 47 TSTM
07/18 72/61/67/-5/0.04/000/00               33 NE  AERO 36 NE  RMY 33
07/19 89/61/75/+3/0.00/580/65               24 WSW AERO 26 SW  RMY 25
07/20 93/75/84/+12/0.00/802/90              21 WSW AERO 22 WSW RMY N/A
07/21 92/76/84/+12/0.00/729/82              31 W   AERO 35 W   RMY 31
07/22 81/64/73/+1/1.22/284/32               35 ENE AERO 37 ENE RMY 34
07/23 66/58/62/-10/0.86/009/01              30 NNE AERO 33 NNE RMY 30
07/24 77/60/69/-3/0.01/575/65               14 NE  AERO 15 NE  RMY N/A
07/25 80/61/71/-1/0.00/732/83            17 SSE AERO 23 N   RMY 17
07/26 84/62/73/+1/0.00/730/83               22 SSE AERO 23 SSE RMY 20
07/27 83/64/74/+2/0.00/834/95               21 S   AERO 23 S   RMY 21
07/28 89/64/77/+5/0.00/710/81               25 WSW AERO 36 WSW RMY 26
07/29 89/71/80/+8/0.01/804/92               23 W   AERO 25 W   RMY 21
07/30 93/71/82/+10/0.00/767/88              24 S   AERO 24 S   RMY 23
07/31 90/68/79/+7/0.55/548/63               37 SW  AERO 35 SW  RMY 38 TSTM

DAILY RECORDS FOR JULY 2019

7/20/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F,
BREAKS PREVIOUS RECORD OF 73F SET IN 1977, 2015

7/21/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F,
BREAKS PREVIOUS RECORD OF 75F SET IN 1991

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

8/01   84/66/75/+3/0.00/…/..                18 NNW AERO 20 NW  RMY 17
8/02   83/61/72/0/0.00/…/..                18 WSW AERO 18 WSW RMY 18
8/03   84/66/75/+3/0.00/…/..               25 SW  AERO 26 SW  RMY 25
8/04   83/66/75/+3/0.00/…/..               21 NE  AERO 23 SW  RMY 25
8/05   81/58/70/-2/0.00/…/..               20 S   AERO 18 S   RMY 19
8/06   79/63/71/-1/0.00/…/..               15 S   AERO 14 S   RMY 17
8/07   82/66/74/+2/…./…/..               32 SSW AERO 35 SSW RMY 35
8/08   84/67/76/+4/…./…/..               30 SW  AERO 24 WNW RMY 29
8/09   82/63/73/+1/…./…/..               28 NW  AERO 25 NW  RMY 26
8/10   78/59/69/-2/…./…/..               32 NW  AERO 28 NW  RMY 28
8/11   78/55/67/-4/0.00/…/..               28 W   AERO 25 W   RMY 28
8/12   82/60/71/0/0.00/…/..                25 W   AERO 23 W   RMY 26
8/13   77/66/72/+1/0.02/…/..               25 W   AERO 24 WSW RMY 24
8/14   75/62/69/-2/…./…/..               24 ENE AERO 22 ENE RMY 22

8/15 Low temp since midnight is 59F; normal low is 62F

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

RECORDS FOR AUGUST 15
HIGH 95F IN 1928
LOW 47F IN 1964
PRECIP 1.89 INCHES IN 2011
PEAK GUST 44e MPH S IN 1941

RECORDS FOR AUGUST 16
HIGH 95F IN 1944
LOW 50F IN 1927
PRECIP 1.47 INCHES IN 1926
PEAK GUST 45e MPH N IN 1951

TODAY’S REPORT PREPARED BY: Samantha Richard

Category: Daily Discussions

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