Thursday, June 22, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JUNE 22, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

CLEAR START TO MORNING WITH INCREASING CIRRUS CLOUDS BY AFTERNOON

It was a clear morning at Great Blue Hill, with just few cirrus.
Visibility was excellent at 80 miles. By the afternoon, a layer
of broken cirrus moved in. A layer of scattered cumulus was also
present, but it only covered about 1/4 of the sky. Despite the
increasing clouds, visibility stayed at 80 miles.

Temperatures so far have been slightly cooler than yesterday.
Overnight, the temperature got down to a minimum of 59F. The
maximum temperature so far is 80F. Yesterday’s maximum
temperature was 83F,  which is 6F over the normal maximum
temperature of 77F. Dew points have been in the low 50s. The
relative humidity at the 1:00 P.M. EST observation was 37%,
making for very dry conditions. Wind has been fairly light out
of the West, and pressure has been slowly falling throughout
the day.

Today’s Observations:

7 A.M.
Weather: Clear, few cirrus SE-SW and NW-NE
Temperature: 67F; Dew Point: 53F; Wind: W at 8 kts
Sea-level pressure: 30.02 ins. Hg, rising unsteadily
Visibility: 80 miles
6-hr Max temp: 67F
6-hr Min temp: 59F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 80 160/67/53/2808/002/ FEW CI SE-SW AND NW-NE/ 8/001 52012
10067 20059

10 A.M.
Weather: Clear, few cumulus in all directions, few cirrus in all directions
Temperature: 75F; Dew Point: 52F; Wind: W at 4 kts,
Wind Speed: Light
Sea-level pressure: 29.97 ins. Hg, rising, then falling
Visibility: 80 miles
BHO SA 1455 CLR 80 149/75/52/2704/997/ FEW CU ALQDS FEW CI ALQDS WND LGT/
8/101 58011

1 P.M.
Weather: Scattered cumulus, broken cirrus
Temperature: 79F; Dew Point: 50F; Wind: W at 7 kts
Sea-level pressure: 29.94 ins. Hg, rising, then falling
Visibility: 80 miles
6-hr Max temp: 80F
6-hr Min temp: 67F
BHO SA 1755 45 SCT 250 BKN 80 138/79/50/2607/994/ 8/102/ 58011 10080 20067

SUMMARY FOR WEDNESDAY, JUNE 21, 2017

TEMPERATURE (DEGREES F)
MAX…..83   NORMAL…..77
MIN…..64   NORMAL…..59
MEAN….74   NORMAL…..68

DEPARTURE FROM 30-YEAR NORMAL…………………….+6
TOTAL DEPARTURE FOR THE MONTH……………………+34 [+1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE MONTH…………..62   DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE SEASON………..5724   DEPARTURE……..-642
TOTAL HEATING UNITS LAST SEASON TO DATE……5282   DIFFERENCE…….+442

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………9   DEPARTURE……….+5
TOTAL COOLING UNITS FOR THE MONTH…………..93   DEPARTURE………+34
TOTAL COOLING UNITS FOR THE SEASON…………149   DEPARTURE………+66
TOTAL COOLING UNITS LAST SEASON TO DATE……..97   DEPARTURE………+52

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….29 W   AT 11:57 A.M.
AERO……………………30 W   AT  1:14 P.M.
ASOS……………………30 W   AT 11:59 A.M.
DAVIS…………………..29 W   AT 11:58 A.M. RMY 30
FASTEST MILE FOR YESTERDAY…………………22 W   AT  1:17 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………22 W   AT  1:17 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21 W   AT  1:17 P.M.
AVERAGE WIND SPEED AND DIRECTION………….13.2 WNW
ASOS………………….13.0
DAVIS…………………11.6 W [260 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….5.62  DEPARTURE……+2.35
ASOS…………..5.69
TOTAL PRECIPITATION FOR THE YEAR……….30.96  DEPARTURE……+5.03
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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

6/1  78/55/67/+5/0.06/706/78               39 NW  AERO 39 NW  RMY 41
6/2  70/50/60/-2/T/652/72                  32 WNW AERO 35 WNW RMY 34
6/3  66/47/57/-5/0.01/472/52               23 NW  AERO 25 NW  RMY 24
6/4  71/49/60/-3/0.28/490/54               21 SSE*AERO 21 SW  RMY N/A
6/5  55/49/52/-11/1.20/000/00              32 NE  AERO 35 NE  RMY N/A
6/6  49/45/47/-16/1.36/000/00              40 ENE AERO 43 ENE RMY 43
6/7  65/47/56/-8/0.05/519/57               21 NNE AERO 18 NE* RMY 20
6/8  76/52/64/0/0.00/602/66                21 SSE AERO 21 SSE RMY 18
6/9  78/53/66/+2/0.16/438/48               48 N   AERO 54 N   RMY 52 TSTM
6/10 83/59/71/+6/0.00/722/79               25 SSW AERO 28 SSW RMY 27
6/11 89/64/77/+12/0.00/704/77              29 SW  AERO 32 WSW RMY 30
6/12 94/69/82/+17/0.00/851/93              28 W   AERO 29 W   RMY 28
6/13 92/67/80/+15/0.03/…/..              25 W   AERO 28 WNW RMY 28
6/14 78/56/67/+1/0.02/…/..               20 S   AERO 20 S   RMY 20
6/15 75/54/65/-1/0.00/…/..               25 SSW AERO 29 S   RMY 30
6/16 70/56/63/-3/2.14/…/..               28 S   AERO 29 S   RMY N/A
6/17 70/58/64/-3/0.01/000/00               18 S   AERO 18 S   RMY N/A
6/18 82/65/74/+7/T/…/..                  33 SSW*AERO 35 SSW RMY 37
6/19 82/67/75/+8/…./…/..               40 S   AERO 43 S   RMY 43
6/20 84/66/75/+7/…./…/..               38 SW  AERO 44 SW  RMY 40
6/21 83/64/74/+6/0.00/…/..               29 W   AERO 30 W   RMY 30

6/22 Low temp since midnight is 59F; normal low is now 59F

DAILY RECORDS FOR JUNE

6/12/17: DAILY RECORD MAXIMUM TEMPERATURE OF 94F,
BREAKS PREVIOUS RECORD OF 92F SET IN 1973

6/12/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 69F,
TIES PREVIOUS RECORD SET IN 1942

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

RECORDS FOR JUNE 22
HIGH 93F IN 1921, 2012
LOW 43F IN 1940
PRECIP 1.57 INS IN 1900
PEAK GUST 74 MPH NW IN 1988

RECORDS FOR JUNE 23
HIGH 93F IN 1888
LOW 45F IN 1885
PRECIP 0.70 INS IN 2006
PEAK GUST 63 MPH SE IN 1972 (AGNES)

TODAY’S REPORT PREPARED BY: Lizzy Suzedell