Wednesday, July 19, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 19, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

HUMID AND HAZY DAY AS TEMPS ALMOST REACH 90F

Warm, moist air continues to enter the region increasing
dew points into the low- and mid-70s today.  The southerly
flow, high humidity, and light wind have made for hazy
visible conditions.  Visibility reached just 25 miles at
the 1:00PM EST ob when winds were gusting 20 MPH.  Temps.
were a degree short of reaching 90F by 1:00PM and had begun
to fall slightly.

Today’s Observations:

7 A.M.
Weather: Few cumulus NE-SW, scattered altocumulus
Temperature: 74F; Dew Point: 70F; Wind: SW at 6 kts,
Wind speed: Light
Sea-level pressure: 30.05 ins. Hg, steady then rising
Visibility: 15 miles, hazy
6-hr Max temp: 74F
6-hr Min temp: 70F
24-hr precip: 0.07 in.
BHO SA 1155 110 SCT 15 176/74/70/2306/005/ FEW CU NE-SW HAZY
WND LGT/ 8/130 53001 MANUAL 70007 ASOS 70007 10074 20070

10 A.M.
Weather: Scattered cumulus
Temperature: 83F; Dew Point: 73F; Wind: S at 7 kts
Sea-level pressure: 30.03 ins. Hg, falling, then less quickly
Visibility: 20 miles, hazy
BHO SA 1455 64 SCT 20 169/83/73/1907/003/ HAZY/ 8/100 56007

1 P.M.
Weather: Scattered cumulus, scattered altocumulus
Temperature: 86F; Dew Point: 70F; Wind: SW at 9G17 kts
Sea-level pressure: 29.98 ins. Hg, falling, then more quickly
Visibility: 25 miles, hazy
6-hr Max temp: 89F
6-hr Min temp: 73F
BHO SA 1755 SCT 39 SCT 120 25 151/86/70/2309G17/998/ HAZY/
8/130 58018 10089 20073

SUMMARY FOR TUESDAY, JULY 18, 2017

TEMPERATURE (DEGREES F)
MAX…..85   NORMAL…..81
MIN…..68   NORMAL…..63
MEAN….77   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………….+5
TOTAL DEPARTURE FOR THE MONTH……………………+15 [+1.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..12   DEPARTURE……….+4
TOTAL COOLING UNITS FOR THE MONTH………….140   DEPARTURE………+18
TOTAL COOLING UNITS FOR THE SEASON…………341   DEPARTURE………+90
TOTAL COOLING UNITS LAST SEASON TO DATE…….308   DEPARTURE………+33

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23  S  AT 5:23 P.M.
AERO……………………23  S  AT 5:22 P.M.
ASOS……………………23  S  AT 5:23 P.M.
DAVIS…………………..23 SSE AT 5:22 P.M. RMY 23
FASTEST MILE FOR YESTERDAY…………………17  S  AT 5:27 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17  S  AT 6:09 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15  S  AT 5:27 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.4  S
ASOS…………………..9.0
DAVIS………………….6.7 SSW [201 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.07  DEPARTURE……-0.06
ASOS…………..0.07
TOTAL PRECIPITATION FOR THE MONTH……….1.58  DEPARTURE……-0.62
ASOS…………..1.55
TOTAL PRECIPITATION FOR THE YEAR……….32.95  DEPARTURE……+3.78
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 Low temp since midnight is 70F; 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 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: Cecilia Borries-Strigle