Wednesday, July 19, 2023

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

WEDNESDAY, JULY 19, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0424E
SUNSET:  1917E

MORE CLOUDS THAN SUN ONCE AGAIN TODAY, BUT STILL WARM AND HUMID…

Early morning fog burned off, but a lot of high level cloud
cover remained through most of the day. Haziness from the
wildfire smoke continued to reduce visibility after the fog
burned off, with views of only around 10-15 miles being the
norm today.

Temperatures have warmed into the low 80s despite the abundance
of cloud cover. With the dew point in the mid to upper 60s, it
still feels sticky outside.

The wind has been generally light today. The average speed for
the day so far is around 8mph. The peak gust so far is around
18mph, occurring just before 2pm!

The maximum temperature so far today is 82F, this is equal to
the normal high of 82F. The minimum temperature today is 68F,
this is 4 degrees above the normal low of 64F.

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Today’s Observations:

7 A.M.
Weather: Thin scattered cirrus, few stratus fractus distant SSW-NNW
Temperature: 71F; Dew Point: 69F; Relative Humidity: 93%
Wind: W @ 5 kts, wind light
Sea-level pressure: 1016.0 mb; 30.00 in. Hg: rising, then more rapidly
Visibility: 10 miles, thin fog
6-hr Max temp: 71F
6-hr Min temp: 68F
24-hr Precip: 0.00 inches
BHO SA 1155 250 -SCT 10 160/71/69/2705/000/ FEW STFRA DSNT SSW-NNW
THN F ALQDS WND LGT/ 8/701 53017 10071 20068

10 A.M.
Weather: Broken cirrus, smoke layer all quadrants
Temperature: 79F; Dew Point: 68F; Relative Humidity: 68%
Wind: WNW @ 5 kts, wind light
Sea-level pressure: 1016.1 mb; 30.01 in. Hg: falling, then rising
Visibility: 10 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E250 BKN 10 161/79/68/3005/001/ K LYR ALQDS HAZY
WND LGT/ 8/002 53001

1 P.M.
Weather: Broken cirrus, few cumulus all quadrants, smoke layer
all quadrants
Temperature: 82F; Dew Point: 65F; Relative Humidity: 57%
Wind: W @ 7 kts
Sea-level pressure: 1015.7mb; 29.99 in. Hg: rising, then falling
Visibility: 15 miles, hazy
6-hr Max temp: 82F
6-hr Min temp: 71F
6-hr Precip: 0.00 inches
BHO SA 1755 E250 BKN 15 157/82/65/2707/999/ FEW CU ALQDS K LYR ALQDS
HAZY/ 8/201 58004 10082 20071

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SUMMARY FOR TUESDAY, JULY 18, 2023

TEMPERATURE (DEGREES F)
MAX…….84   NORMAL…..82
MIN…….70   NORMAL…..64
MEAN……77   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+4
TOTAL DEPARTURE FOR THE MONTH…………………+45 [+2.3 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……..-5
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE……..-5
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY……………12  DEPARTURE……..+4
TOTAL COOLING UNITS FOR THE MONTH…………..179  DEPARTURE…….+40
TOTAL COOLING UNITS FOR THE SEASON………….307  DEPARTURE…….+29
TOTAL COOLING UNITS LAST SEASON TO DATE……..309  DEPARTURE……..-2

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)……….E28 SSW   @  04:07 P.M.
VECTOR #1 (1-Sec)……….28 SSW   @  04:07 P.M.
VECTOR #2 (1-Sec)……….26 SW    @  03:48 P.M.
DAVIS #1……………….25 S     @  02:33 P.M.
DAVIS #2 ………………32 S     @  04:10 P.M.
RMY #1 (Instantaneous)…..27 SSW   @  04:07 P.M.
RMY #2 (Instantaneous)…..26 SW    @  03:48 P.M.
MERLIN…………………25 SSW
RICHARDS (C5C) (Inst)……26       @  04:07 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 SW  @  03:48 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18     @  03:50 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19     @  03:50 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 SSW @  03:50 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 S   @  01:26 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 SW  @  03:50 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 SW  @  03:50 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………17     @  02:33 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……….. 9.8 SSW [235 total miles] VECTOR #1…………………10.1
VECTOR #2…………………10.8
DAVIS #1…………………. 9.5 SSW
DAVIS #2………………….10.8 SSW
RMY #1…………………… 9.9 SSW
RMY #2……………………10.9 SSW
RICHARDS (C5C)……………. 9.9

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.10
TOTAL PRECIPITATION FOR THE MONTH…………..5.10 DEPARTURE…..+3.10
TOTAL PRECIPITATION FOR THE YEAR…………..30.28 DEPARTURE…..+1.05

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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/+8/0.00/713/79             21 WSW  VEC1 22 SSW RMY 20
7/13  88/67/78/+5/0.13/695/77             35 SSW  VEC1 35 SSW RMY 38 TSTM
7/14  78/65/72/-1/0.18/342/38             29 SSW  VEC1 32 SSW RMY 32 TSTM
7/15  86/70/78/+5/T/548/61                28 SSW  VEC1 30 SSW RMY 29 TSTM
7/16  76/71/74/+1/2.56/000/00             40 S    VEC1 41 SSW RMY 48 TSTM
7/17  86/71/79/+6/0.00/699/78             21 WSW  VEC1 21 W   RMY 23
7/18  84/70/77/+4/0.00/402/45             28 SSW  VEC1 28 SSW RMY 27

7/19 The low since midnight is 68, 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 19
HIGH 96F IN 1977, 1991
LOW 50F IN 1890
PRECIP 1.10 INS IN 1951
WIND 63 MPH SSW IN 1982

RECORDS FOR JULY 20
HIGH 99F IN 1991
LOW 47F IN 1890
PRECIP 1.64 INS IN 1938
WIND 56e MPH SSW IN 1943

TODAY’S REPORT PREPARED BY: Matt Douglas