Monday, June 19, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JUNE 19, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

HUMID WEATHER CONTINUES, CUMULONIMBUS SPOTTED AT 1:00PM

Today was another hazy and humid day.  Fog in the morning
limited visibility to 6 miles and was slow to clear from
the summit of Great Blue Hill.  Hazy conditions followed
with visibility reaching 20 miles at 1:00PM EST.  Dew
points were again in the low 70s for most of the day as
temperatures climbed to a max. of 82F.

Winds began to increase ahead of a line of severe weather.
The peak gust was 31 MPH at the 1:00PM ob, but gusts were
reaching 40 MPH afterward.  Cumulonimbus clouds were observed
WNW-NNW.

Today’s Observations:

7 A.M.
Weather: Fog, overcast stratus
Temperature: 70F; Dew Point: 69F; Wind: S at 13G20 kts
Sea-level pressure: 29.88 ins. Hg, rising, then more slowly
Visibility: 6 miles
6-hr Max temp: 70F
6-hr Min temp: 68F
24-hr precip: Trace
BHO SA 1155 E4 OVC 6F 118/70/69/1913G20/988/ 8/6// 51010 10070
20068

10 A.M.
Weather: Broken stratocumulus, broken stratus
Temperature: 77F; Dew Point: 71F; Wind: S at 11G18 kts
Sea-level pressure: 29.88 ins. Hg, rising then falling
Visibility: 10 miles, distant fog in all directions
BHO SA 1455 E12 BKN 16 BKN 10 118/77/71/1911G18/988/
DSNT FG ALQDS/ 8/600 50000

1 P.M.
Weather: Scattered cumulus, cumulonimbus WNW-NNW
Temperature: 82F; Dew Point: 71F; Wind: S at 17G27 kts,
Peak Wind: 27 kts (31 MPH) S at 12:52PM EST
Sea-level pressure: 29.84 ins. Hg, falling, then more quickly
Visibility: 20 miles, hazy
6-hr Max temp: 82F
6-hr Min temp: 70F
BHO SA 1755 19 SCT 20 106/82/71/1817G27/984/ CB WNW-NNW PK WND
1927/52 HAZY/ 8/300 58012 10082 20070

SUMMARY FOR SUNDAY, JUNE 18, 2017

TEMPERATURE (DEGREES F)
MAX…..82   NORMAL…..76
MIN…..65   NORMAL…..58
MEAN….74   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH……………………+13 [+0.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH…………..62   DEPARTURE……….+2
TOTAL HEATING UNITS FOR THE SEASON………..5724   DEPARTURE……..-639
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…………..64   DEPARTURE………+17
TOTAL COOLING UNITS FOR THE SEASON…………120   DEPARTURE………+49
TOTAL COOLING UNITS LAST SEASON TO DATE……..84   DEPARTURE………+36

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….33 SSW AT 1:19 P.M.*
AERO……………………35 SSW AT 1:19 P.M.
ASOS……………………36 SSW AT 1:19 P.M.
DAVIS…………………..37 SSW AT 1:18 P.M. RMY 37
FASTEST MILE FOR YESTERDAY…………………26 SSW AT 1:17 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………28 SSW AT 1:17 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..28 SSW AT 1:17 P.M.
AVERAGE WIND SPEED AND DIRECTION………….14.6  S
ASOS………………….14.9
DAVIS…………………12.7  SSW [198 DEG.] *last of multiple occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….5.32  DEPARTURE……+2.46
ASOS…………..5.38
TOTAL PRECIPITATION FOR THE YEAR……….30.66  DEPARTURE……+5.14
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 Low temp since midnight is 68F; normal low is now 58F

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 19
HIGH 92F IN 1923
LOW 40F IN 1920
PRECIP 3.92 INS 1922
PEAK GUST 66e MPH NW IN 1940

RECORDS FOR JUNE 20
HIGH 94F IN 1953
LOW 41F IN 1918
PRECIP 2.62 INS 1945
PEAK GUST 63 MPH NE IN 1967, SSW IN 2010

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle