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Friday, July 19, 2019

July 19, 2019

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JULY…

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JULY 19, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A COOL MORNING LEADING TO HOT AND HUMID
CONDITIONS ON THE GREAT BLUE HILL….

Temperatures this morning started in the
lower 60s with overcast conditions. Clouds
cleared out by the 10 A.M. observation
leading to increasing temperatures. Possible
heat wave and record breaking temperatures
in the coming days. Saturday will most likely
be the hottest conditions we have seen so
far this year. The high so far today is 86F,
which is 5 degrees higher than the average
daily maximum of 81F. The low since midnight
is 61F, 2 degrees below the daily normal
minimum of 63F.

PRELIMINARY STATS FOR JUNE 2019

TEMPERATURE, Deg. F
Avg. Max. 75.1 [+0.1] Avg. Min. 57.3 [+0.2] Mean      66.2 [+0.1] 24-hour corrected mean: 66.0
Max. for month: 88F on the 28th
Min. for month: 45F on the 4th

COOLING DEGREE DAYS
Total cooling units:    81 [-24] Total for the season:   89 [-40] Total for last season: 159

HEATING DEGREE DAYS
Total cooling units:     36  [-37] Total for the season:  6254 [-122] Total for last season: 5916

PRECIPITATION, Inches
Total: 4.08 [-0.23] Greatest in 24 hrs: 1.30 ins. on the 10th-11th

WIND, mph
Avg. uncorrected wind speed: 9.9
Avg. corrected wind speed: 10.5
Prevailing wind direction: S at 17%
Peak gust and direction: 41 W on 3rd

SUNSHINE:
Campbell-Stokes card minutes: 14118 minutes of possible 26376 or 54%
Astronomical total minutes:   14674 minutes of possible 27416 or 54%

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 65F; Dew Point: 57F; Wind: N at 2 kts
Wind: light
Sea-level pressure: 29.91 ins. Hg, rising, then falling
Visibility: 75 miles, distant haze
6-hr Max temp: 65F
6-hr Min temp: 61F
24-hr Precip: 0.03 ins.
BHO SA 1155 E28 OVC 75 131/65/57/0102/991/
DSNT HZ ALQDS WND LGT/ 8/6// 70003 50005 10065 20061

10 A.M.
Weather: Clear
Temperature: 76F; Dew Point: 65F; Wind: SSW at 5 kts
Sea-level pressure: 29.89 ins. Hg, rising, then falling
Visibility: 75 miles, distant haze
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 75 122/76/65/2005/989/
FEW AC DSNT HZ ALQDS WND LGT/ 8/060 58009

1 P.M.
Weather: Scattered cirrus, few distant cumulus
Temperature: 86F; Dew Point: 71F; Wind: SW at 8 kts
Sea-level pressure: 29.87 ins. Hg, falling, then more quickly
Visibility: 45 miles, distant haze
6-hr Max temp: 86F
6-hr Min temp: 65F
6-hr Precip: 0.00 ins.
BHO SA 1755 E250 SCT 45 117/86/71/2208/987/ FEW CU DSNT HZ
ALQDS WND LGT/ 8/106 58015 10086 20065

SUMMARY FOR THURSDAY, JULY 18, 2019

TEMPERATURE (DEGREES F)
MAX…..72   NORMAL…..81
MIN…..61   NORMAL…..63
MEAN….67   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………….-5
TOTAL DEPARTURE FOR THE MONTH…………………+64 [+3.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..2   DEPARTURE………-13
TOTAL COOLING UNITS FOR THE MONTH………….181   DEPARTURE……..+59
TOTAL COOLING UNITS FOR THE SEASON…………270   DEPARTURE……..+19
TOTAL COOLING UNITS LAST SEASON TO DATE…….332   DEPARTURE……..-62

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..33 NE AT 9:48 A.M.
AERO…………………….36 NE AT 9:48 A.M.
ASOS…………………….35 NE AT 9:50 A.M.
DAVIS……………………MISSING           RMY 47
FASTEST MILE FOR YESTERDAY………………….MISSING
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 NE AT 9:53 A.N.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………MISSING
AVERAGE WIND SPEED AND DIRECTION…………….11.5 SW
ASOS…………………….11.1
DAVIS……………………MISSING [MMM deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.03  DEPARTURE……+0.09
ASOS…………..0.04
TOTAL PRECIPITATION FOR THE MONTH……….2.81  DEPARTURE……+0.60
ASOS…………..2.82
TOTAL PRECIPITATION FOR THE YEAR……….32.68  DEPARTURE……+3.50
ASOS………….32.50

PRELIMINARY CLIMATE SUMMARY FOR JUNE 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

06/01 71/54/63/+1/0.00/551/61               21 E   AERO 20 E   RMY 18
06/02 75/51/63/+1/0.02/417/46               23 S   AERO 21 S   RMY N/A
06/03 69/50/60/-2/0.02/753/83               41 W   AERO 39 W   RMY 43
06/04 70/45/58/-5/0.00/717/79               29 W   AERO 23 W   RMY N/A
06/05 81/57/69/+6/0.03/527/58               33 SSW AERO 33 SSW RMY N/A
06/06 75/64/70/+6/0.06/428/47               28 SSW AERO 28 SSW RMY N/A
06/07 80/59/70/+6/0.00/692/76               23 S   AERO 23 S   RMY 22
06/08 78/57/68/+4/0.00/885/97               23 ENE AERO 21 SW  RMY 21
06/09 78/55/67/+3/0.00/840/93               22 S   AERO 21 S   RMY 21
06/10 79/54/67/+2/0.29/712/78               26 SSE AERO 25 SSE RMY 33
06/11 73/58/66/+1/1.03/247/27               32 NW  AERO 30 NW  RMY 35
06/12 75/52/64/-1/0.00/869/95               25 SSW AERO 25 S   RMY 28
06/13 55/49/52/-13/0.81/000/00              36 NE  AERO 35 NE  RMY 35
06/14 72/50/61/-5/0.00/540/59               38 W   AERO 39 W   RMY 38
06/15 79/54/67/+1/0.00/879/96               38 SSW AERO 41 SSW RMY 40
06/16 70/62/66/0/0.13/000/00                32 SW  AERO 35 SW  RMY N/A
06/17 74/62/68/+1/0.00/348/38               12 SSE AERO 18 NW  RMY 17
06/18 71/62/67/0/0.10/000/00                17*S   AERO 17 S   RMY 16
06/19 74/61/68/+1/0.00/101/11               16 SSE AERO 20 SSE RMY 19
06/20 69/61/65/-3/0.26/000/00               26 S   AERO 26 S   RMY 29
06/21 68/58/63/-5/0.75/018/02               32 NW  AERO 28 NW  RMY 33
06/22 77/56/67/-1/T/779/85                  33 NW  AERO 32 NW  RMY 35
06/23 82/59/71/+3/0.00/871/95               30 NW  AERO 25 WNW RMY 29
06/24 84/61/73/+4/0.00/779/85               22 NW  AERO 21 NW  RMY 22
06/25 73/61/67/-2/0.18/083/09               35 S   AERO 37 S   RMY 37
06/26 77/64/71/+2/0.00/559/61               12 ENE AERO 18 SE  RMY N/A
06/27 81/57/69/0/0.00/614/67                21 NE  AERO 18 NE  RMY N/A
06/28 88/64/76/+6/0.00/870/95               16 SW  AERO 18 SW  RMY N/A
06/29 80/66/73/+3/0.29/165/18               25 W   AERO 25 W   RMY 26
06/30 75/59/67/-3/0.13/430/47               31 N   AERO 30 N   RMY 35

*Estimated

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/…/..               21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/…/..               23 W   AERO 23 W   RMY 23
07/03 89/67/78/+7/0.00/…/..               18 S   AERO 18 S   RMY 18
07/04 88/68/78/+7/0.00/…/..               17 SSW AERO M  M   RMY 17
07/05 87/69/78/+7/0.00/…/..               21 SW  AERO M  M   RMY 21
07/06 90/71/81/+10/0.83/…/..              26 WNW AERO M  M   RMY N/A
07/07 78/64/71/0/0.00/…/..                30 NE  AERO M  M   RMY N/A
07/08 79/59/69/-3/0.00/…/..               16 N   AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/…/..               18 NW  AERO 16 NW  RMY 18
07/10 88/69/79/+7/0.00/…/..               20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/0.62/…/..               35 S   AERO 33 S   RMY 36
07/12 84/68/76/+4/0.00/…/..               31 WNW AERO 30 WNW RMY 32
07/13 85/65/75/+3/0.00/…/..               21 W   AERO 20 WSW RMY 20
07/14 87/68/78/+6/0.00/…/..               25 W   AERO 21 W   RMY 23
07/15 82/63/73/+1/0.00/…/..               24 WNW AERO 23 WNW RMY 22
07/16 86/65/76/+4/0.00/…/..               23 W   AERO 21 W   RMY 21
07/17 90/70/80/+8/1.32/…/..               44 W   AERO M  M   RMY 47
07/18 72/61/67/-5/…./…/..               33 NE  AERO 36 NE  RMY 33

Low temp since midnight is 61F; normal low is 63F

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

RECORDS FOR JULY 19
HIGH 96F IN 1977, 1991
LOW 50F IN 1890
PRECIP 1.10 INS IN 1951
WIND 63 MPH SSW IN 1982

RECORDS FOR JULY 20
HIGH 99F IN 1991
LOW 47F IN 1890
PRECIP 1.64 INS IN 1938
WIND 56e MPH SSW IN 1943

TODAY’S REPORT PREPARED BY: Nicholas Rousseau

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