Saturday, June 24, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JUNE 24, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

RAINY START TO MORNING WITH SUN RETURNING BY EARLY AFTERNOON

The remnants of tropical storm Cindy brought 0.19 in. of rain to Great
Blue Hill. 0.18 in. of rain fell between 8:00 A.M. and 10:00 A.M. EST,
and another small band brought 0.01 in. from 11:00 A.M. to 11:15 A.M.
Skies were covered or mostly covered with clouds before noon, but after
the last rain showers fell, skies cleared up and the sun began to warm
the humid air. Visibility went up to 70 miles by the 1:00 P.M. EST
observation. At the 7:00 A.M. observation, visibility was only at 20 miles.
When there was rain and fog in between these two observations, visibility
was as low as 1/8 of a mile.

Temperatures only went down to a minimum of 70F last night. This does not
break a record because the highest minimum recorded for June 24 was 72F in
1888. The temperatures did not rise as quickly as they have been doing over
the past few days. At 7:00 A.M., it was 74F, but a cold front following the
storm cooled the air down to 71F at 10:00 A.M. Once the rain was over, the
sun was able to heat the air to a high of 79F by 1:00 P.M. The temperature
continued to go higher and the air continued to dry out after that.

Winds have been fairly calm compared to yesterday. A peak gust of 33 MPH
out of the S was measured at 1:50 P.M. EST yesterday afternoon. Today, winds
were out of the SSW until they shifted to the W shortly after 12:00 P.M.
A peak of 22 MPH out of the SW occurred at 3:58 A.M. The wind was at its
calmest from 9:00 A.M. until 12:00 P.M., when the wind shifted. Winds have
been increasing since then.

Today’s Observations:

7 A.M.
Weather: Few stratocumulus in all directions, scattered altocumulus,
broken altostratus, broken cirrus
Temperature: 74F; Dew Point: 70F; Wind: SSW at 11G18 kts
Sea-level pressure: 29.55 ins. Hg, rising, then falling
Visibility: 20 miles, distant fog in all directions
6-hr Max temp: 74F
6-hr Min temp: 70F
24-hr precip: 0.00 in.
BHO SA 1155 65 SCT E130 BKN 250 BKN 20 008/74/70/2114G18/955/ FEW SC ALQDS
DSNT FG ALQDS/ 8/571 50002 10074 20070

10 A.M.
Weather: Fog, overcast stratus
Temperature: 71F; Dew Point: 70F; Wind: SSW at 8 kts
Sea-level pressure: 29.57 ins. Hg, rising, then falling
Visibility: 1/2 mile, fog
3-hr precip: 0.18 in.
BHO SA 1455 E12 OVC 1/2F 013/71/70/2108/957/ 8/6// 50005 MANUAL 60018 ASOS
60018

1 P.M.
Weather: Scattered cumulus, few altocumulus N-S, few altostratus N-S, few
cirrus NE-SW
Temperature: 79F; Dew Point: 70F; Wind: W at 2811G18 kts
Peak Wind: 26 kts (30 MPH) S at 12:51 PM EST
Sea-level pressure: 29.60 ins. Hg, rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 79F
6-hr Min temp: 71F
BHO SA 1755 12 SCT 70 024/79/70/2811G18/960/ FEW AC N-S FEW AS N-S FEW CI
NE-SW/ 8/171 51011 MANUAL 60019 ASOS 60019 10079 20071

SUMMARY FOR FRIDAY, JUNE 23, 2017

TEMPERATURE (DEGREES F)
MAX…..88   NORMAL…..77
MIN…..66   NORMAL…..59
MEAN….77   NORMAL…..68

DEPARTURE FROM 30-YEAR NORMAL…………………….+9
TOTAL DEPARTURE FOR THE MONTH……………………+42 [+1.6 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……….-5
TOTAL HEATING UNITS FOR THE SEASON………..5724   DEPARTURE……..-646
TOTAL HEATING UNITS LAST SEASON TO DATE……5282   DIFFERENCE…….+442

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….33 S   AT  1:50 P.M.
AERO……………………36 S   AT  1:48 P.M.
ASOS……………………36 S   AT  1:51 P.M.
DAVIS…………………..36 S   AT  1:50 P.M. RMY 36
FASTEST MILE FOR YESTERDAY…………………26 S   AT  1:33 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………26 S   AT  1:35 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..23 SSW AT  6:05 P.M.
AVERAGE WIND SPEED AND DIRECTION………….14.5 S
ASOS………………….14.2
DAVIS…………………12.7 SSW [195 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….5.62  DEPARTURE……+2.12
ASOS…………..5.69
TOTAL PRECIPITATION FOR THE YEAR……….30.96  DEPARTURE……+4.80
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 83/59/71/+6/0.00/…/..               23 W   AERO 22 W   RMY 21
6/23 88/66/77/+9/0.00/…/..               33 S   AERO 36 S   RMY 36

6/24 Low temp since midnight is 70F; normal low is now 60F

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 24
HIGH 91F IN 1914,1976,2013
LOW 40F IN 1932
PRECIP 2.80 INS IN 1929
PEAK GUST 54 MPH WNW IN 2010

RECORDS FOR JUNE 25
HIGH 93F IN 1943,1980, 2005
LOW 47F IN 1903
PRECIP 1.38 INS IN 2012
PEAK GUST 51 MPH W IN 1960

TODAY’S REPORT PREPARED BY: Lizzy Suzedell