Monday, July 24, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 24, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL DAY WITH HEAVY RAIN IN AFTERNOON

Temperatures fell from a high of 72F yesterday to 59F
at 7:00AM EST this morning.  They have continued to
decrease throughout the day reaching a low of 55F by
1:00PM.  The max. of 62F at midnight for today may tie
the record for today’s low maximum temperature.

Rain began in the early morning hours and has continued
through the early afternoon.  It became heavy past noon
with a one hour total of approximately 0.40 in. from
12:00PM-1:00PM.  The 6-hour total equalled 0.63 in at
1:00PM.  This is already 0.50 in. above normal for today.

Winds speeds have also increased on Great Blue Hill.
Wind direction continues to be out of the east north-east
and east.  A peak gust of 35 MPH was recorded after the
1:00PM observation.

Today’s Observations:

7 A.M.
Weather: Light rain, broken stratus fractus, overcast nimbostratus
Temperature: 59F; Dew Point: 55F; Wind: E at 14G22 kts
Sea-level pressure: 29.94 ins. Hg, rising then falling
Visibility: 15 miles, except 6 miles SW, distant fog in all directions
6-hr Max temp: 62F
6-hr Min temp: 59F
24-hr precip: 0.04 in.
BHO SA 1155 E44 BKN 89 OVC 15R- 138/59/55/0914G22/994/ VSBY SW 6
DSNT FG ALQDS/ 8/72/ 58002 MANUAL 70004 ASOS 70004 10062 20059

10 A.M.
Weather: Light rain, fog, overcast nimbostratus
Temperature: 57F; Dew Point: 55F; Wind: ENE at 15G22 kts
Sea-level pressure: 29.94 ins. Hg, falling then rising
Visibility: 6 miles
3-hr precip: 0.12 in.
BHO SA 1455 E33 OVC 6R-F 138/57/55/0715G22/994/ 8/02/ 55000
MANUAL 6012/ ASOS 60012

1 P.M.
Weather: Rain, fog, overcast nimbostratus
Temperature: 55F; Dew Point: 54F; Wind: ENE at 16G27 kts,
Peak wind: 27 kts (31 MPH) ENE at 12:53PM EST
Sea-level pressure: 29.89 ins. Hg, falling then steady
Visibility: 2 miles
6-hr Max temp: 59F
6-hr Min temp: 55F
6-hr precip: 0.63 in.
BHO SA 1755 E9 OVC 2RF 122/55/54/0616G27/989/ PK WND 0627/53/
8/02/ 56016 MANUAL 6063/ ASOS 60059 10059 20055

SUMMARY FOR SUNDAY, JULY 23, 2017

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……………………+33 [+1.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE……….-6
TOTAL COOLING UNITS FOR THE MONTH………….200   DEPARTURE………+39
TOTAL COOLING UNITS FOR THE SEASON…………401   DEPARTURE……..+111
TOTAL COOLING UNITS LAST SEASON TO DATE…….369   DEPARTURE………+32

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….33 NE AT 3:16 A.M.
AERO……………………32 NE AT 3:16 A.M.
ASOS……………………33 NE AT 3:17 A.M.
DAVIS…………………..31 NE AT 3:17 A.M. RMY 33
FASTEST MILE FOR YESTERDAY…………………22 NE AT 3:17 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 NE AT 3:28 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..22 NE AT 3:17 A.M.
AVERAGE WIND SPEED AND DIRECTION………….10.8 ENE
ASOS………………….10.8
DAVIS………………….9.3 ENE [058 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.04  DEPARTURE……-0.10
ASOS…………..0.04
TOTAL PRECIPITATION FOR THE MONTH……….1.62  DEPARTURE……-1.24
ASOS…………..1.59
TOTAL PRECIPITATION FOR THE YEAR……….32.99  DEPARTURE……+3.16
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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

7/1  85/67/76/+6/T/439/48                  35 S   AERO 37 S   RMY 38
7/2  87/69/78/+8/T/785/86                  25 W*  AERO 28 W*  RMY 27
7/3  85/67/76/+5/0.00/894/98               28 W*  AERO 29 W   RMY 30
7/4  84/62/73/+2/0.00/783/86               17 W   AERO 17 W   RMY 18
7/5  82/62/72/+1/0.00/855/94               20 S   AERO 20 ENE RMY 20
7/6  82/60/71/+0/0.00/664/73               21 SSW AERO 22 SSW RMY 21
7/7  71/60/66/-5/0.63/000/00               28 ENE AERO 28 ENE RMY 27
7/8  84/61/73/+1/0.15/463/51               30 SW* AERO 32 SSW RMY 33  TSTM
7/9  81/60/71/-1/0.00/897/99               26 W   AERO 26 W   RMY 26
7/10 85/63/74/+2/T/751/83                  25 SW  AERO 25 S   RMY 26
7/11 82/66/74/+2/0.25/253/28               24 S   AERO 24 S   RMY N/A
7/12 85/68/77/+5/0.43/325/36               23 NE  AERO 22 NE  RMY 23  TSTM
7/13 68/55/62/-10/0.03/000/00              28 NNE AERO 28 NE  RMY 29
7/14 63/56/60/-12/0.02/…/..              15 E   AERO 14 E   RMY 14
7/15 80/60/70/-2/0.00/…/..               18 S   AERO 16 S   RMY 18
7/16 87/64/76/+4/0.00/…/..               18 SSE AERO 16 E   RMY 17
7/17 84/68/76/+4/0.00/…/..               25 S   AERO 25 S*  RMY 25
7/18 85/68/77/+5/0.07/…/..               23 S   AERO 23 S   RMY 23
7/19 90/70/80/+8/0.00/…/..               22 SW  AERO 22 SW* RMY 22
7/20 90/70/80/+8/0.00/…/..               21 WSW AERO 22 WSW RMY 21
7/21 90/68/79/+7/0.00/…/..               26 W   AERO 26 W   RMY 27
7/22 87/70/79/+7/T/…/..                  20 WNW AERO 20 WNW RMY N/A
7/23 72/61/67/-5/T/…/..                  33 NE  AERO 32 NE  RMY 33

7/24 Low temp since midnight is 57F; normal low is now 63F

DAILY RECORDS FOR JULY

None so far.

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

RECORDS FOR JULY 24
HIGH 96F IN 1987
LOW 49F IN 1893,1912
PRECIP 2.27 INS IN 2008
PEAK GUST 46 MPH NE IN 2009

RECORDS FOR JULY 25
HIGH 96F IN 2016
LOW 51F IN 1901,1953
PRECIP 2.25 INS IN 1990
PEAK GUST 88 MPH NW IN 1972

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle