Tuesday, July 30, 2019

| July 30, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 30, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

HAZY, HOT, AND HUMID ON TOP OF THE
GREAT BLUE HILL…

We observed limited visibility of 25 miles this morning, which
increased to 30 miles due to decreasing in haze in the afternoon.
Wind were nearly calm throughout the day with the highest wind
speed seen so for today being 6 miles per hour. Dew points stayed
around 70 degrees throughout the day. The high so far today is 91F,
which is 10 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 cirrus
Temperature: 76F; Dew Point: 70F; Wind: WSW at 6 kts
Sea-level pressure: 30.01 ins. Hg, steady, then rising
Visibility: 25 miles, Haze
6-hr Max temp: 76F
6-hr Min temp: 71F
24-hr Precip: 0.01 ins.
BHO SA 1155 250 SCT 25 165/76/70/2406/001/
HAZY WND LGT/ 8/001 70001 53009 10076 20071

10 A.M.
Weather: Scattered cirrus
Temperature: 87F; Dew Point: 71F; Wind: W at 4 kts
Sea-level pressure: 30.03 ins. Hg, rising, then steady
Visibility: 25 miles, Haze
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 25 168/87/71/2804/003/
HAZY WND LGT/ 8/001 51003

1 P.M.
Weather: Scattered cumulus, Scattered cirrus
Temperature: 91F; Dew Point: 70F; Wind: S at 6 kts
Sea-level pressure: 30.00 ins. Hg, rising, then falling
Visibility: 30 miles, Haze
6-hr Max temp: 93F
6-hr Min temp: 76F
6-hr Precip: 0.00 ins.
BHO SA 1755 65 SCT 250 SCT 30 161/91/70/1906/000/
HAZY WND LGT/ 8/202 58007 10093 20076

SUMMARY FOR MONDAY, JULY 29, 2019

TEMPERATURE (DEGREES F)
MAX…..89   NORMAL…..81
MIN…..71   NORMAL…..63
MEAN….80   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………….+8
TOTAL DEPARTURE FOR THE MONTH…………………+94 [+3.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..15   DEPARTURE………+3
TOTAL COOLING UNITS FOR THE MONTH………….291   DEPARTURE……..+83
TOTAL COOLING UNITS FOR THE SEASON…………380   DEPARTURE……..+43
TOTAL COOLING UNITS LAST SEASON TO DATE…….437   DEPARTURE……..-57

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 W AT 2:45 P.M.
AERO…………………….25 W AT 2:48 P.M.
ASOS…………………….24 W AT 2:47 P.M.
DAVIS……………………24 W AT 2:47 P.M. RMY 21
FASTEST MILE FOR YESTERDAY………………….14 W AT 2:44 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 W AT 2:48 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………16 W AT 2:48 P.M.
AVERAGE WIND SPEED AND DIRECTION……………8.8 W
ASOS……………………9.5
DAVIS…………………..8.9 WSW [239 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.14
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….4.91  DEPARTURE……+1.20
ASOS…………..4.95
TOTAL PRECIPITATION FOR THE YEAR……….34.78  DEPARTURE……+4.10
ASOS………….34.72

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
07/29 89/71/80/+8/…./…/..               23 W   AERO 25 W   RMY 21

7/30 Low temp since midnight is 71F; 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 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944

RECORDS FOR JULY 31
HIGH 95F IN 1917
LOW 50F IN 1895,1918
PRECIP 1.34 INS IN 1892
PEAK GUST 43e MPH WNW SW IN 1953, 43 SW IN 1971

TODAY’S REPORT PREPARED BY: Nicholas Rousseau

Category: Daily Discussions

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