Friday, July 12, 2024

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

FRIDAY, JULY 12, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0419E
SUNSET:  1921E

CLOUDS INCREASE WITH SHOWERS MOVING IN EARLY THIS AFTERNOON….

We started the day with partial sunshine which lasted through
most of the morning hours. However clouds overtook the sky by
early this afternoon with showers following soon behind.

Temperatures did reach the mid 80s before the clouds and rain
moved in, making for yet another warm and humid day.

The dew point started the day lower than the past few days with
readings in the upper 60s, however it has risen back into the
mid 70s early this afternoon as the showers moved in.

The wind is less busy than yesterday with an average speed for
the day so far of around 10mph. It has been gusty at times
with values of 20-25mph occurring occasionally. The peak gust
so far is 25mph, which occurred just before 11:30am.

Visibility got as high as 50 miles this morning, but has since
decreased with the rain showers in the area. The view early
this afternoon has dropped below 6 miles at times.

The maximum temperature so far today is 85F, which is 3 degrees
above the normal high of 82F. The minimum temperature since
midnight is 69F, which is 5 degrees above the normal low of 64F.

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Today’s Observations:

7 A.M.
Weather: Scattered altocumulus/castellanus, scattered cirrus,
few cumulonimbus distant S-SW, few lower altostratus distant SE-W
Temperature: 76F; Dew Point: 69F; Relative Humidity: 79%
Wind: SSW @ 5 kts, wind light
Sea-level pressure: 1022.0 mb; 30.18 in. Hg: rising, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 69F
24-hr Precip:  0.00 inches
BHO SA 1155 85 SCT 250 SCT 40 220/76/69/2105/018/ FEW CB DSNT S-SW
FEW LWR AS DSNT SE-W HAZY/ 8/371 53019 10076 20069

10 A.M.
Weather: Scattered altostratus, scattered altocumulus/castellanus,
scattered cirrus, few cumulus/cumulus fractus all quadrants
Temperature: 84F; Dew Point: 69F; Relative Humidity: 61%
Wind: SSW @ 10G18 kts
Sea-level pressure: 1021.9 mb; 30.18 in. Hg: rising, then falling
Visibility: 50 miles
3-hr Precip: 0.00 inches
BHO SA 1455 85 SCT 120 SCT 250 SCT 50 219/84/69/2110G18/018/
FEW CU/CUFRA ALQDS/ 8/271 58001

1 P.M.
Weather: Broken stratus fractus, overcast nimbostratus,
light rain showers
Temperature: 75F; Dew Point: 74F; Relative Humidity: 95%
Wind: SW @ 8 kts
Sea-level pressure: 1022.4 mb; 30.19 in. Hg: rising, then steady
Visibility: 4 miles, fog
6-hr Max temp: 85F
6-hr Min temp: 75F
6-hr Precip: 0.02 inches
BHO SA 1755 E10 BKN 27 OVC 3RW-F 224/75/74/2308/019/ RW-E09B20/
8/72/ 51005 6002/ 10085 20075

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SUMMARY FOR THURSDAY, JULY 11, 2024

TEMPERATURE (DEGREES F)
MAX…….87  NORMAL…..82
MIN…….71  NORMAL…..64
MEAN……79  NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+6
TOTAL DEPARTURE FOR THE MONTH…………………….+44 [+3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….0  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE……..-3
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY……………14  DEPARTURE……..+6
TOTAL COOLING UNITS FOR THE MONTH…………..122  DEPARTURE…….+41
TOTAL COOLING UNITS FOR THE SEASON………….300  DEPARTURE…….+80
TOTAL COOLING UNITS LAST SEASON TO DATE……..223  DEPARTURE…….+77

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

F420C (Official)……….E41 SSW  @   02:08 P.M.
VECTOR #1 (1-Sec)……….40 SSW  @   03:45 A.M.
VECTOR #2 (1-Sec)……….42 SSW  @   03:39 A.M.
DAVIS #1……………….42 S    @   03:40 A.M.
DAVIS #2 ………………42 S    @   03:25 A.M.
RMY #1 (Instantaneous)…..41 SSW  @   02:08 P.M.
RMY #2 (Instantaneous)…..45 SSW  @   03:39 A.M.
MERLIN…………………37 SSW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………30 SW   @   02:24 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..27      @   03:24 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..28      @   02:09 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………28 S    @   03:24 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………29 SSW  @   03:25 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..27 SSW  @   03:24 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..29 SSW  @   02:09 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……16.4 SSW [393 total miles] VECTOR #1…………….16.2
VECTOR #2…………….17.1
DAVIS #1……………..15.7 SSW
DAVIS #2……………..17.0 SSW
RMY #1……………….15.9 SSW
RMY #2……………….17.2 SSW
RICHARDS (C5C)…………OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..0.44 DEPARTURE…..-0.77
TOTAL PRECIPITATION FOR THE YEAR (2024)…….36.12 DEPARTURE…..+7.68

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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   77/63/70/-1/0.07/722/79             29 N   VEC1 27 N   RMY 28 TSTM
7/2   80/60/70/-1/0.00/886/97             20 N   VEC1 20 N   RMY 19
7/3   84/62/73/+1/0.00/856/94             25 S   VEC1 25 S   RMY 26
7/4   85/62/74/+2/0.04/392/43             28 SSW VEC1 28 SSW RMY 28
7/5   84/68/76/+4/0.22/146/16             29 SSW VEC1 29 SSW RMY 29
7/6   77/71/74/+2/0.10/009/01             31 SW  VEC1 33 SSW RMY 33
7/7   88/72/80/+8/0.00/345/38             15 SW  VEC1 15 SW  RMY 14
7/8   91/71/81/+9/0.00/780/86             17 NW  VEC1 18 NW  RMY 18
7/9   88/72/80/+7/T/534/59                26 SSW VEC1 27 SSW RMY 29
7/10  88/72/80/+7/0.00/552/61             38 SSW VEC1 37 SSW RMY 38
7/11  87/71/79/+6/0.01/470/52             41 SSW VEC1 40 SSW RMY 41

7/12  The low since midnight is 69F, the daily normal low is 64F.

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JULY DAILY RECORDS TO DATE

NONE.

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

RECORDS FOR JULY 12
HIGH 96F IN 1908
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944

RECORDS FOR JULY 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996

TODAY’S REPORT PREPARED BY: Matt Douglas