Saturday, July 15, 2023

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

SATURDAY, JULY 15, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0420E
SUNSET:  1919E

HUMID MORNING WITH EARLY FOG CLEARS FOR BETTER VISIBILITY AND
WARM WEATHER FOR OUR GRAND REOPENING…

Early this morning, fog covered the top of the hill and lifted
shortly before the 7 o’clock observation. Dew point was high
throughout the day reading in the 70’s between 7 and 1. Visibility
increased from 30 miles at 7 to about 50 miles between 10 and 1.
Our high temperature so far today was 86F which is 4 degrees higher
than our normal high temperature of 82F. Our low since midnight was
70F which is 6 degrees higher than our normal low temperature of 64F.
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Today’s Observations:

7 A.M.
Weather: Broken stratocumulus
Temperature: 74F; Dew Point: 71F; Relative Humidity: 90%
Wind: SW @ 6 kts
Sea-level pressure: 1015.5 mb; 29.99 in. Hg: rising then steady
Visibility: 30 miles
6-hr Max temp: 74F
6-hr Min temp: 70F
24-hr Precip: 0.00 inches
BHO SA 1155 E30 BKN 30 155/74/71/2206/999/ 8/400 51007 10074 20070

10 A.M.
Weather: Broken stratocumulus
Temperature: 79F; Dew Point: 72F; Relative Humidity: 79%
Wind: SSW @ 11 kts
Sea-level pressure: 1016.8 mb; 30.03 in. Hg: rising unsteadily
Visibility: 40 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E30 BKN 40 168/79/72/2011/003/ 8/400 52013

1 P.M.
Weather: Broken stratocumulus
Temperature: 86F; Dew Point: 71F; Relative Humidity: 62%
Wind: S @ 7 kts
Sea-level pressure: 1015.3mb; 29.98 in. Hg: decreasing unsteadily
Visibility: 40 miles
6-hr Max temp: 86F
6-hr Min temp: 74F
6-hr Precip: 0.00 inches
BHO SA 1755 E30 BKN 40 153/86/71/1807/998/ 8/400 57015 10086 20074

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SUMMARY FOR FRIDAY, JULY 14, 2023

TEMPERATURE (DEGREES F)
MAX…….78   NORMAL…..82
MIN…….65   NORMAL…..64
MEAN……72   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-1
TOTAL DEPARTURE FOR THE MONTH…………………+29 [+1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….0  DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE……..-4
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….7  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………..131  DEPARTURE…….+26
TOTAL COOLING UNITS FOR THE SEASON………….259  DEPARTURE…….+15
TOTAL COOLING UNITS LAST SEASON TO DATE……..271  DEPARTURE…….-12

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated

F420C (Official)……….E29 SSW   @  04:37 P.M.
VECTOR #1 (1-Sec)……….21 SSW   @  04:37 P.M.
VECTOR #2 (1-Sec)……….32 SSW   @  04:37 P.M.
DAVIS #1……………….29 S     @  04:34 P.M.
DAVIS #2 ………………35 S     @  04:33 P.M.
RMY #1 (Instantaneous)…..32 SSW   @  04:37 P.M.
RMY #2 (Instantaneous)…..32 SSW   @  05:00 P.M.
MERLIN…………………29 SW
RICHARDS (C5C) (Inst)……31       @  04:37 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 SSW @  04:37 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21     @  04:37 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22     @  04:38 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 SW  @  04:37 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 S   @  04:35 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 SSW @  04:37 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 SSW @  04:38 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19     @  04:37 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………..9.0 S [217 total miles] VECTOR #1…………………9.4
VECTOR #2………………..10.0
DAVIS #1………………….8.9 S
DAVIS #2…………………10.0 S
RMY #1……………………9.2 S
RMY #2…………………..10.1 S
RICHARDS (C5C)…………….9.5

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..2.54 DEPARTURE…..+0.98
TOTAL PRECIPITATION FOR THE YEAR…………..27.72 DEPARTURE…..-1.07

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PRELIMINARY CLIMATE SUMMARY FOR JULY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

7/1   80/61/71/0/0.00/567/62              17 SSE  VEC1 16 SSE RMY 17
7/2   74/63/69/-2/0.34/027/03             35 S    VEC1 35 S   RMY 35
7/3   79/63/72/-1/0.40/265/29             18 NNW  VEC1 18 NNW RMY 17 TSTM
7/4   71/65/68/-4/0.81/000/00             17 NE   VEC1 18 NE  RMY 17 TSTM
7/5   88/66/77/+5/0.00/720/79             17 S    VEC1 16 SE  RMY 15
7/6   92/69/81/+9/0.00/683/75             23 SSW  VEC1 22 SSW RMY 23
7/7   87/70/78/+6/0.00/763/84             23 SW   VEC1 22 SW  RMY 23
7/8   84/70/77/+5/0.00/463/51             20 W    VEC1 20 W   RMY 19
7/9   81/69/75/+2/T/200/22                17 ESE  VEC1 18 E   RMY 17
7/10  71/66/69/-4/0.68/000/00             22 ESE  VEC1 21 ESE RMY 22
7/11  85/62/74/+1/0.00/796/88             24 WNW  VEC1 25 WNW RMY 25
7/12  91/70/81/+8/0.00/…/..             21 WSW  VEC1 22 SSW RMY 20
7/13  88/67/78/+5/…/…/..              35 SSW  VEC1 35 SSW RMY 38 TSTM
7/14  78/65/72/-1/…/…/..              29 SSW  VEC1 32 SSW RMY 32

7/15 The low since midnight is 70, the daily normal low is 64F

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

RECORDS FOR JULY 15
HIGH 94F IN 1995
LOW 50F IN 1929, 1930
PRECIP 1.64 INS IN 1896
WIND 71 MPH WNW IN 2002

RECORDS FOR JULY 16
HIGH 94F IN 1968, 1980, 1983, 1999
LOW 50F IN 1903
PRECIP 0.98 INS IN 2014
WIND 48e MPH SW 1944

TODAY’S REPORT PREPARED BY: Samantha Richard