Saturday, July 17, 2021

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

SATURDAY, JULY 17, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0423E
SUNSET:  1918E

CONVECTIVE SHOWERS ARE THE NAME OF THE GAME SO FAR….

We observed tall cumulus clouds today, producing a couple
showers that left us with 0.04 inches of rainfall following
the 0.04 inches that fell yesterday afternoon. This brings
the monthly rain total to an astounding 10 inches. That’s
a monthly surplus of 8.17 inches and a yearly of 4.58 inches.
 
Visibility broke 50 miles with fog being a factor this morning.
Cumulonimbus have been seen off to the southeast.

The high so far today is 78F, 4 degrees above the daily average
of 82F. The low so far today is 67F, which is 3 degrees above
the daily average of 64F.

On a side note, the renovations have begun in earnest this week.
We are no longer operating out of the tower and have moved to
another part of the building. All wind instruments on the main
tower have been taken offline and will remain so until further
notice. Please be patient with us as we navigate through our
new routine. Data at times may be delayed.

———————————————–

Today’s Observations:

7 A.M.
Weather: Scattered towering cumulus, scattered altocumulus,
broken cirrostratus
Temperature: 70F; Dew Point: 63F; Relative Humidity: 78%
Wind: NE @ 8 kts
Sea-level pressure: 30.10 in. Hg; Steady, then rising
Visibility: 30 miles, hazy
6-hr Max temp: 72F
6-hr Min temp: 67F
24-hr Precip: 0.00 in.
BHO SA 1155 50 SCT 100 SCT 250 BKN 30 194/70/63/0608/010/
HAZY/ 8/276 70004 53011 10072 20067

10 A.M.
Weather: Scattered towering cumulus, broken altocumulus,
thin broken cirrostratus
Temperature: 70F; Dew Point: 66F; Relative Humidity: 88%
Wind: E @ 7 kts
Sea-level pressure: 30.10 in Hg; rising then falling
Visibility: 35 miles, thin fog
3-hr Precip: 0.01 ins.
BHO SA 1455 50 SCT 100 BKN 250 -BKN 35RW- 194/70/66/0807/010/ FEW
LWR STFRA CB MVNG SW-SE THN F ALQDS RWE45B55/ 8/376 6001/ 55000


1 P.M.
Weather: Scattered Cumulus, thin broken cirrostratus
(cumulonimbus distant SE)
Temperature: 77F, Dew point: 70F; Relative Humidity: 80%
Wind: ENE @ 8 kts  
Sea-level pressure: 30.10 in Hg; falling then rising
Visibility: 50 miles
6-hr Max temp: 78F
6-hr Min temp: 69F
6-hr Precip: 0.04 ins.
BHO SA 1755 50 SCT 250 BKN 50 195/77/70/0708/010/ CB DSNT SE/
8/306 6004/ 52001 10078 20069


SUMMARY FOR FRIDAY, JULY 16, 2021

TEMPERATURE (DEGREES F)
MAX…….90     NORMAL…..82
MIN…….70     NORMAL…..64
MEAN……80     NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+7
TOTAL DEPARTURE FOR THE MONTH…………………-69 [-4.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH……………26  DEPARTURE…….+22
TOTAL HEATING UNITS FOR THE SEASON…………..26  DEPARTURE…….+22
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE…….+26

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY……………15  DEPARTURE…….+7
TOTAL COOLING UNITS FOR THE MONTH……………77  DEPARTURE……-45
TOTAL COOLING UNITS FOR THE SEASON………….303  DEPARTURE……+42
TOTAL COOLING UNITS LAST SEASON TO DATE……..299  DEPARTURE…….+4

PEAK WIND GUST (MPH):
                     Official……………….36 NNW @ 3:19 P.M.
                     AEROVANE (south tower)…..39 NNW @ 3:19 P.M.
                     VECTOR #2 (south tower)….40     @ 3:19 P.M.
                     DAVIS #2 (south tower)…..34 N   @ 3:20 P.M.
                     ASOS………..OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
                     RMY…………OUT OF SERVICE D/T RENOVATIONS  
                     MERLIN………OUT OF SERVICE D/T RENOVATIONS


FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 SW  @ 3:20 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25     @ 3:19 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 NNW @ 3:20 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY AVERAGE……..OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……10.5 SW [252 total miles]
                     VECTOR #2…………….11.3
                     DAVIS #2……………..11.0 SW
                     RMY……………..OUT OF SERVICE D/T RENOVATIONS
                     ASOS…………….OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS   

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.04  DEPARTURE….-0.07
TOTAL PRECIPITATION FOR THE MONTH………….9.96  DEPARTURE….+8.17
TOTAL PRECIPITATION FOR THE YEAR………….33.34  DEPARTURE….+4.58

 

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


07/01   80/65/73/+2/0.74/155/17           22 W   AERO 20 WSW  RMY 21
07/02   65/55/60/-11/1.49/000/00          37 NE  AERO 36 NE   RMY 39
07/03   56/54/55/-17/1.98/000/00          41 NE  AERO 44 NE   RMY 45 TSTM
07/04   66/54/60/-12/0.16/191/21          26 ENE AERO 23 ENE  RMY 26
07/05   74/53/64/-8/0.01/546/60           26 SSW AERO 28 SSW  RMY 27
07/06   87/66/77/+5/0.26/255/28           37 W   AERO 48 W    RMY 38 TSTM
07/07   88/88/77/+5/0.77/699/77           63 NW  AERO 75 NW   RMY 70 TSTM
07/08   67/59/63/-9/0.38/109/12           46 W   AERO 46 W    RMY 51 TSTM
07/09   73/62/68/-5/3.02/163/18           40 WNW AERO 44 WNW  RMY 43
07/10   71/63/67/-6/0.07/109/12           23 NE  AERO 21 NNE  RMY 22
07/11   81/61/71/-2/T/325/36              21 SW  AERO 19 S    RMY N/A
07/12   67/61/64/-9/1.01/000/00           31 ENE AERO 31 ENE  RMY N/A
07/13   66/60/63/-10/0.02/…/..          19 E   AERO 18 E    RMY N/A
07/14   80/62/71/-2/0.01/…/..           19 S   AERO 18 S    RMY N/A
07/15   88/67/78/+5/0.00/…/..           19 WSW AERO 18 SSW  RMY N/A
07/16   90/70/80/+7/…./…/..           36 NNW AERO 39 NNW  RMY N/A

07/17   The low since midnight is 67F, the daily normal low is 64F

RECORDS FOR JULY:
JULY 2: Record daily precipitation of 1.49″,
        Surpasses previous record of 1.42″ set in 1986

JULY 3: Record daily precipitation of 1.98″,
        Surpasses previous record of 1.36″ set in 1985

JULY 7: Record peak gust of 63 MPH,
        Surpasses previous record of 55 MPH set in 1989


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

RECORDS FOR JULY 17
HIGH 96F IN 1999
LOW 47F IN 1892
PRECIP 1.39 INS IN 1989
WIND 46 MPH WNW IN 1971

RECORDS FOR JULY 18
HIGH 96F IN 1991, 1999
LOW 54F IN 1892, 1956, 1971
PRECIP 1.65 INS IN 2000
WIND 43e MPH SW IN 1949

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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