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Monday, July 29, 2019

July 29, 2019

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, 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
MONDAY, JULY 29, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

HOT AND HAZY CONDITIONS ON TOP OF
THE GREAT BLUE HILL…

Hazy condition limited visibility to 35 miles
throughout the day. Humidity slowly decreased from
the high 70s in the morning to low 50s by the 1 P.M
observation. Warmer than average temperatures
persist with the high yesterday being 89 degrees,
8 degree above the average of 81F. The high so
far today is 88F, which is 7 degrees above the average
daily maximum of 81F. The low since midnight is 71F,
8 degrees above the daily normal minimum of 63F.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, Scattered cirrostratus
Temperature: 76F; Dew Point: 68F; Wind: WSW at 8 kts
Sea-level pressure: 30.00 ins. Hg, falling, then rising
Visibility: 35 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 71F
24-hr Precip: 0.00 ins.
BHO SA 1155 140 SCT 250 SCT 35 161/76/68/2508/000/
HAZY/ 8/055 55007 10076 20071

10 A.M.
Weather: Scattered cirrus, Few cumulus
Temperature: 84F; Dew Point: 74F; Wind: W at 7 kts
Sea-level pressure: 29.99 ins. Hg, rising, than falling
Visibility: 35 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 35 159/84/74/2707/999/ FEW CU HAZY/
8/002 58002

1 P.M.
Weather: Scattered cumulus
Temperature: 88F; Dew Point: 68F; Wind: SW at 8 kts
Sea-level pressure: 29.99 ins. Hg, rising, than falling
Visibility: 35 miles, hazy
6-hr Max temp: 88F
6-hr Min temp: 76F
6-hr Precip: 0.00 ins.
BHO SA 1755 60 SCT 35 150/88/68/2308/999/ HAZY/ 8/100
58009 10088 20076

SUMMARY FOR SUNDAY, JULY 28, 2019

TEMPERATURE (DEGREES F)
MAX…..89   NORMAL…..81
MIN…..64   NORMAL…..63
MEAN….77   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………….+5
TOTAL DEPARTURE FOR THE MONTH…………………+86 [+3.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..12   DEPARTURE………+3
TOTAL COOLING UNITS FOR THE MONTH………….276   DEPARTURE……..+76
TOTAL COOLING UNITS FOR THE SEASON…………365   DEPARTURE……..+36
TOTAL COOLING UNITS LAST SEASON TO DATE…….427   DEPARTURE……..-62

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 WSW AT 12:15 P.M.
AERO…………………….26 WSW AT 3:49  P.M.
ASOS…………………….27 SW  AT 12:52 P.M.
DAVIS……………………26 WSW AT 1:57  P.M. RMY 25
FASTEST MILE FOR YESTERDAY………………….21 WSW AT 2:48  P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 SW  AT 12:53  P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………25 WSW AT 1:58  P.M.
AVERAGE WIND SPEED AND DIRECTION……………10.9 SSW
ASOS……………………11.4
DAVIS…………………..10.5 SS [221 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……….4.90  DEPARTURE……+1.34
ASOS…………..4.94
TOTAL PRECIPITATION FOR THE YEAR……….34.77  DEPARTURE……+4.24
ASOS………….34.71

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
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/…/..               44 W   AERO M  M   RMY 47
07/18 72/61/67/-5/0.04/…/..               33 NE  AERO 36 NE  RMY 33
07/19 89/61/75/+3/0.00/…/..               24 WSW AERO 26 SW  RMY 25
07/20 93/75/84/+12/0.00/…/..              21 WSW AERO 22 WSW RMY N/A
07/21 92/76/84/+12/0.00/…/..              31 W   AERO 35 W   RMY 31
07/22 81/64/73/+1/…./…/..               35 ENE AERO 37 ENE RMY 34
07/23 66/58/62/-10/…./…/..              30 NNE AERO 33 NNE RMY 30
07/24 77/60/69/-3/…./…/..               14 NE  AERO 15 NE  RMY N/A
07/25 80/61/71/-1/…./…/.. 17 SSE AERO 23 N   RMY 17
07/26 84/62/73/+1/0.00/…/..               22 SSE AERO 23 SSE RMY 20
07/27 83/64/74/+2/…./…/..               21 S   AERO 23 S   RMY 21
07/28 89/64/77/+5/…./…/..               25 WSW AERO 36 WSW RMY 26

Low temp since midnight is 64F; normal low is 63F

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

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

RECORDS FOR JULY 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INS IN 1901
PEAK GUST 40e MPH E IN 1941

RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944

TODAY’S REPORT PREPARED BY: Nicholas Rousseau

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