Wednesday, July 26, 2023

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

WEDNESDAY, JULY 26, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0431E
SUNSET:  1910E

ABUNDANT SUNSHINE, WARM, AND HUMID HERE ON THE HILL TODAY…

Storms late yesterday afternoon and evening brought another
bout of heavy rainfall to the hill. 1.02″ of rain was measured,
most of that falling in a 2 hour period between 3pm-5pm.
This brings the monthly total over 8″ now, with more rain
likely over the coming days!

Sunshine has been the theme today with only some cumulus
clouds popping up this afternoon in the increasingly unstable
air mass. Temperatures have warmed into the mid 80s once
again today. The dew point has been generally in the mid
60s, so it’s feeling a bit sticky out there.

The wind has been mainly on the light side once again today.
The average speed for the day so far is only around 9mph.
A peak gust of around 20mph occurred way back around 1am.

Visibility has been limited thanks to hazy conditions due to
the higher moisture content in the air. The view has been
decreasing through the day, from 30 miles early this morning
to only 15 miles this afternoon.

The maximum temperature so far today is 85F, this is 3 degrees
above the normal high of 82F. The minimum temperature today is
63F, which is 1 degree below the normal low of 64F.

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Today’s Observations:

7 A.M.
Weather: Clear
Temperature: 66F; Dew Point: 64F; Relative Humidity: 92%
Wind: WSW @ 6 kts, wind light
Sea-level pressure: 1018.9 mb; 30.09 in. Hg: rising, then more rapidly
Visibility: 30 miles
6-hr Max temp: 66F
6-hr Min temp: 63F
24-hr Precip: 1.02 inches
BHO SA 1155 CLR 30 189/66/64/2506/009/ WND LGT/ 8/000 53004
70102 10066 20063

10 A.M.
Weather: Clear
Temperature: 77F; Dew Point: 67F; Relative Humidity: 72%
Wind: WSW @ 5 kts, wind light
Sea-level pressure: 1019.9 mb; 30.12 in. Hg: rising, then more slowly
Visibility: 20 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 20 199/77/67/2505/012/ HAZY WND LGT/ 8/000 51010

1 P.M.
Weather: Clear, few cumulus all quadrants, few cirrus distant NW-N
Temperature: 84F; Dew Point: 65F; Relative Humidity: 53%
Wind: SW @ 9 kts
Sea-level pressure: 1018.3mb; 30.07 in. Hg: falling, then more rapidly
Visibility: 15 miles, hazy
6-hr Max temp: 85F
6-hr Min temp: 66F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 15 183/84/65/2309/007/ FEW CU ALQDS FEW CI DSNT NW-N
HAZY/ 8/201 58016 10085 20066

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SUMMARY FOR TUESDAY, JULY 25, 2023

TEMPERATURE (DEGREES F)
MAX…….85   NORMAL…..82
MIN…….64   NORMAL…..64
MEAN……75   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+2
TOTAL DEPARTURE FOR THE MONTH…………………+53 [+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……..-6
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE……..-6
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY……………10  DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH…………..243  DEPARTURE…….+45
TOTAL COOLING UNITS FOR THE SEASON………….371  DEPARTURE…….+34
TOTAL COOLING UNITS LAST SEASON TO DATE……..435  DEPARTURE…….-64

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 NNE   @  03:25 P.M.
VECTOR #1 (1-Sec)……….30 NNW   @  02:13 P.M.
VECTOR #2 (1-Sec)……….28 NW    @  03:17 P.M.
DAVIS #1……………….26 NNW   @  02:13 P.M.
DAVIS #2 ………………25 N     @  02:17 P.M.
RMY #1 (Instantaneous)…..29 NNW   @  02:13 P.M.
RMY #2 (Instantaneous)…..28 NW    @  03:17 P.M.
MERLIN…………………25 NW
RICHARDS (C5C) (Inst)……27       @  02:13 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 NNE @  03:30 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20     @  03:28 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22     @  03:27 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 NNE @  03:27 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 NNE @  03:27 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 NNE @  03:27 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 NNE @  03:27 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19     @  03:59 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……….. 9.6 SW [231 total miles] VECTOR #1………………… 9.9
VECTOR #2…………………10.3
DAVIS #1…………………. 9.5 SW
DAVIS #2………………….10.1 SW
RMY #1…………………… 9.8 SW
RMY #2……………………10.4 SW
RICHARDS (C5C)……………. 9.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..1.02 DEPARTURE…..+0.91
TOTAL PRECIPITATION FOR THE MONTH…………..8.11 DEPARTURE…..+5.34
TOTAL PRECIPITATION FOR THE YEAR…………..33.29 DEPARTURE…..+3.29

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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  83/68/76/+3/0.00/…/..             23 W    VEC1 23 W   RMY 22
7/20  82/64/73/+0/0.00/…/..             17 NNE  VEC1 17 SE  RMY 18
7/21  79/62/71/-2/1.99/…/..             30 NW   VEC1 31 NW  RMY 32 TSTM
7/22  81/64/73/0/0.00/…/..              15 W    VEC1 14 W   RMY 16
7/23  85/65/75/+2/0.00/…/..             21 NW   VEC1 20 W   RMY 21
7/24  85/67/76/+3/0.00/…/..             23 S    VEC1 24 S   RMY 24
7/25  85/64/75/+2/1.02/…/..             29 NNE  VEC1 30 NNW RMY 29 TSTM

7/26 The low since midnight is 63, the daily normal low is 64F

DAILY RECORDS

07/16/2023: NEW RECORD DAILY PRECIPITATION OF 2.56 INCHES;
SURPASSES THE PREVIOUS RECORD OF 0.98 INCHES IN 2014

07/16/2023: RECORD HIGH DAILY MINIMUM TEMPERATURE OF 71F;
TIES THE RECORD OF 71F SET IN 1901, 1958, 1968, AND 2013

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

RECORDS FOR JULY 26
HIGH 97F IN 1963
LOW 47F IN 1920
PRE 2.05 INS IN 1899
WIND 74e MPH NNW IN 1940

RECORDS FOR JULY 27
HIGH 95F IN 1949, 1963
LOW 50F IN 1920, 2001
PRECIP 4.01 INS IN 1979
WIND 47 MPH ENE IN 1984

TODAY’S REPORT PREPARED BY: Matt Douglas