Friday, August 9, 2019

| August 9, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, AUGUST 9, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR AND DRY DAY ON TOP OF THE
GREAT BLUE HILL….

We observed fair visibly throughout
the day, with 70 miles being observed
at all 3 observations. Wind has
slightly increased this morning with
our peak gust so far being 28 miles
per hour recorded on the 420c. Dew
points were relatively steady
staying in the low 60s to high 50s.
The high so far today is 82F, a
degree above the daily normal
maximum of 81F. The low since
midnight is 63F, 2 degrees above
the average daily minimum of 61F.

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: N/A

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:Clear
Temperature: 67F; Dew Point: 62F; Wind: W at 8 kts
Sea-level pressure: 29.70 ins. Hg, rising, then steady
Visibility: 70 miles
6-hr Max temp: 68F
6-hr Min temp: 63F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 70 058/67/62/2708/970/ 8/000 51010 10068 20063

10 A.M.
Weather: Few Cumulus
Temperature: 76F; Dew Point: 57F; Wind: WNW at 12G17 kts
Sea-level pressure: 29.71 ins. Hg, steady, then rising
Visibility: 70 miles,
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 70 061/76/57/2912G21/971/ FEW CU ALQD/ 8/000 53003

1 P.M.
Weather: scattered cumulus, scattered cirrostratus
Temperature: 80F; Dew Point: 65F; Wind: W at 12G21 kts
Sea-level pressure: 29.72 ins. Hg, falling, then steady
Visibility: 70 miles
6-hr Max temp: 82F
6-hr Min temp: 68F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 250 SCT 70 066/80/65/2812G21/972/
8/105 56005 10082 20068

SUMMARY FOR THURSDAY, AUGUST 8, 2019

TEMPERATURE (DEGREES F)
MAX…..84   NORMAL…..80
MIN…..67   NORMAL…..63
MEAN….76   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………+4
TOTAL DEPARTURE FOR THE MONTH…………………+12 [+1.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..11   DEPARTURE………+2
TOTAL COOLING UNITS FOR THE MONTH…………..68   DEPARTURE……..+11
TOTAL COOLING UNITS FOR THE SEASON…………478   DEPARTURE……..+71
TOTAL COOLING UNITS LAST SEASON TO DATE…….572   DEPARTURE……..-93

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..30 SW  AT   9:24 P.M.
AERO…………………….26 WSW AT  12:14 A.M.
ASOS…………………….30 W   AT   9:26 P.M.
DAVIS……………………33 W   AT   9:25 P.M. RMY 29
FASTEST MILE FOR YESTERDAY………………….23 SW  AT  12:11 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 SSW AT  12:14 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 SSW AT  12:14 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..12.2 SSW
ASOS…………………..12.6
DAVIS………………….11.6 SSW [198 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.78  DEPARTURE……-0.41
ASOS…………..0.81
TOTAL PRECIPITATION FOR THE YEAR……….36.11  DEPARTURE……+3.92
ASOS………….36.09

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/…./284/32               35 ENE AERO 37 ENE RMY 34
07/23 66/58/62/-10/…./009/01              30 NNE AERO 33 NNE RMY 30
07/24 77/60/69/-3/0.00/575/65               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 Low temp since midnight is 63F; normal low is 63F

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
PRECIP 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: Nicholas Rousseau

Category: Daily Discussions

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