Monday, August 12, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, AUGUST 12, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

SUNNY MORNING FOLLOWED BY A CLOUDY EARLY AFTERNOON
WITH GREAT VISIBILITY THROUGHOUT THE DAY…

This morning started out sunny with great visibility
at about 80 miles. These conditions persisted until
about noon when clouds began to enter the area with
a drop in pressure observed around this time. At
1 o’clock, 70 mile visibility was observed with a
slight distant haze. The high so far today was 81F
which is 1 degree above our normal high temperature,
and our low temperature since midnight was 60F, which
is 2 degrees cooler than our normal daily minimum.
No rain has fallen in the last 24 hours, bringing our
precipitation departure from normal to about 0.82 inches
below normal for the beginning of the month.

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: Scattered cirrus
Temperature: 65F; Dew Point: 56F; Wind: W at 6G14 kts
Sea-level pressure: 29.95 ins. Hg, rising then falling
Visibility: 80 miles
6-hr Max temp: 65F
6-hr Min temp: 60F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 80 143/65/56/2606G14/995/ 8/004 50002 10065 20060

10 A.M.
Weather: Clear, few cirrostratus in all directions
Temperature: 76F; Dew Point: 58F; Wind: W at 7G16 kts
Sea-level pressure: 29.94 ins. Hg, falling then steady
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 80 140/76/58/2707G16/994/ FEW CS ALQDS/ 8/005 58003

1 P.M.
Weather: Few cumulus in all directions, broken cirrostratus
Temperature: 80F; Dew Point: 56F; Wind: W at 10G19 kts
Sea-level pressure: 29.89 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 81F
6-hr Min temp: 65F
6-hr Precip: 0.00 ins.
BHO SA 1755 E250 BKN 70 123/80/56/2610G19/989/ FEW CU ALQDS/
8/105 58017 10081 20065

SUMMARY FOR SUNDAY, AUGUST 11, 2019

TEMPERATURE (DEGREES F)
MAX…..78   NORMAL…..80
MIN…..55   NORMAL…..62
MEAN….67   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL………………….-4
TOTAL DEPARTURE FOR THE MONTH………………….+7 [+0.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE………-5
TOTAL COOLING UNITS FOR THE MONTH…………..82   DEPARTURE………+4
TOTAL COOLING UNITS FOR THE SEASON…………493   DEPARTURE……..+64
TOTAL COOLING UNITS LAST SEASON TO DATE…….599   DEPARTURE…….-106

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..28 W AT 3:38 P.M.
AERO…………………….25 W AT 3:57 P.M.
ASOS…………………….27 W AT 2:55 P.M.
DAVIS……………………27 W AT 2:55 P.M. RMY 28
FASTEST MILE FOR YESTERDAY………………….20 W AT 3:38 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 W AT 3:40 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………21 W AT 3:39 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.5 WNW
ASOS…………………..10.9
DAVIS………………….11.1 W [280 deg.]

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……….0.78  DEPARTURE……-0.82
ASOS…………..0.81
TOTAL PRECIPITATION FOR THE YEAR……….36.10  DEPARTURE……+3.51
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/+1/1.22/284/32               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 Low temp since midnight is 60F; normal low is 62F

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

RECORDS FOR AUGUST 12
HIGH 99F IN 1944
LOW 48F IN 1930
PRECIP 1.89 INCHES IN 1979
PEAK GUST 50 MPH NE IN 1983

RECORDS FOR AUGUST 13
HIGH 98F IN 1944, 2002
LOW 47F IN 1902, 1957
PRECIP 2.92 INCHES IN 1989
PEAK GUST 52 MPH SSE IN 1963

TODAY’S REPORT PREPARED BY: Samantha Richard