Tuesday, July 28, 2020

| July 28, 2020 | Reply

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

TUESDAY, JULY 28, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

HOT AND HUMID WITH NEAR RECORD HIGH TEMPERATURE AGAIN…

After coming only 1 degree shy of the record high for
yesterday, we’ve come within 2 degrees of the record
high for today. As of 1 P.M. today we’ve recorded a
high of 95.0, the record for today is 97 degrees set
in 1931! A brief rain shower did knock the temperature
back into the low 80s between 1-2 P.M., however it’s
currently recovering back close to 90 degrees.

So far we’ve had a low temperature of 76 degrees, if
this holds through midnight tonight, this will be a
new record high minimum for the date. The previous
record is 74 degrees set in 1919!

In addition to the high heat, humidity levels have
been on the high side with dew points in the low 70s
most of the day. This has yielded heat indices in the
over 100F at times.

The high so far today is 95 degrees. This is 14 degrees
above the daily normal high of 81F. The low since
midnight is 76F, which is 13 degrees above the daily
normal low of 63F

Today’s Observations:

7 A.M.
Weather: Clear, Cumulonimbus distant WNW-NW, few Altocumulus/
Altocumulus Castellanus all quadrants
Temperature: 80F; Dew Point: 70F; Relative Humidity: 72%
Wind: WSW at 7 kts
Sea-level pressure: 29.75 ins. Hg: rising, then more slowly
Visibility: 20 miles, hazy
6-hr Max temp: 80F
6-hr Min temp: 76F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 20 076/80/70/2407/975/ CB DSNT WNW-NW
FEW AC/ACC ALQDS HAZY/ 8/380 51013 10080 20076

10 A.M.
Weather: Clear, Cumulonimbus distant NW-N, few Altocumulus/
Altocumulus Castellanus distant WSW-NW-N
Temperature: 89F; Dew Point: 70F; Relative Humidity: 54%
Wind: SW at 8G17 kts
Sea-level pressure: 29.77 ins. Hg: rising, then more slowly
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 30 081/89/70/2208G17/977/ CB DSNT NW-N
FEW CU ALQDS FEW AC/ACC DSNT WSW-NW-N HAZY/ 8/380 51005

1 P.M.
Weather: Scattered Cumulus, scattered Altocumulus, Cumulonimbus
SW-W, rain shower SW moving NE
Temperature: 91F; Dew Point: 69F; Relative Humidity: 49%
Wind: WSW at 12G18 kts
Sea-level pressure: 29.74 ins. Hg: falling, then more rapidly
Visibility: 60 miles, except 10 miles SW
6-hr Max temp: 95F
6-hr Min temp: 80F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 80 BKN 60 072/91/69/2512G18/974/ CB SW-W
RW SW MVG NE VSBY 10 SW/ 8/360 58009 10095 20080

SUMMARY FOR MONDAY, JULY 27, 2020

TEMPERATURE (DEGREES F)
MAX…..94   NORMAL…..81
MIN…..72   NORMAL…..63
MEAN….83   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………..+11
TOTAL DEPARTURE FOR THE MONTH……………..+71 [+2.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..18  DEPARTURE…….+10
TOTAL COOLING UNITS FOR THE MONTH…………….242  DEPARTURE…….+49
TOTAL COOLING UNITS FOR THE SEASON……………426  DEPARTURE……+104
TOTAL COOLING UNITS LAST SEASON TO DATE……….353  DEPARTURE…….+73

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 SW  AT  5:13 P.M.
AERO…………………….25 SW  AT  4:51 P.M.
ASOS…………………….24 SW  AT  5:14 P.M.
DAVIS……………………24 W   AT 12:16 A.M
RMY N/A  MERLIN N/A
FASTEST MILE FOR YESTERDAY………………….18 SW  AT  7:46 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 SW  AT  7:47 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 W   AT 12:25 A.M.
AVERAGE WIND SPEED AND DIRECTION……………12.3 WSW
ASOS……………………12.4
DAVIS…………………..12.5 WSW [250 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.71  DEPARTURE……-1.72
ASOS…………..1.79
TOTAL PRECIPITATION FOR THE YEAR……….29.06  DEPARTURE……-1.34
ASOS………….29.80

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  76/63/70/0/0.00/228/25              16 E    AERO 14 E    RMY 14  TSTM
07/02  86/61/74/4/0.00/803/88              30 WSW  AERO 25 WSW  RMY 33
07/03  73/60/67/-4/0.00/091/10             30 NE   AERO 28 NE   RMY 30
07/04  79/60/70/-1/0.00/565/62             16 S    AERO 16 S    RMY 16
07/05  83/63/73/+2/0.54/373/41             24 NW   AERO 30 NW   RMY 26  TSTM
07/06  73/60/67/-4/0.00/482/53             20 ENE  AERO 16 NNE  RMY 18
07/07  78/60/69/-2/0.00/454/50             25 S    AERO 25 S    RMY 26
07/08  83/64/74/+2/0.00/227/25             32 SSW  AERO 32 SSW  RMY 32
07/09  89/70/80/+8/0.00/834/92             24 S    AERO 23 S    RMY 22
07/10  83/70/77/+5/0.05/109/12             30 SSE  AERO 32 SSE  RMY N/A
07/11  85/70/78/+6/0.00/614/68             39 S    AERO 39 S    RMY 38
07/12  86/70/78/+6/0.00/830/92             28 WSW  AERO 28 WSW  RMY 29
07/13  82/69/76/+4/0.23/306/34             30 SSE  AERO 31 SSE  RMY 30  TSTM
07/14  78/63/71/-1/0.00/369/41             26 ENE  AERO 25 ENE  RMY 26
07/15  72/59/66/-6/0.00/539/60             21 NE   AERO 21 NE   RMY N/A
07/16  73/57/65/-7/0.00/815/91             21 E    AERO 21 E    RMY 19
07/17  71/57/64/-8/0.19/027/03             24 SSW  AERO 24 SSW  RMY 25
07/18  89/66/78/+6/0.00/822/92             18 W    AERO 17 W    RMY 19
07/19  92/69/81/+9/0.00/…/..             28 S    AERO 28 S    RMY 26
07/20  91/72/82/+10/T/…/..               25 SSW  AERO 25 SSW  RMY N/A
07/21  88/68/78/+6/0.00/…/..             25 W    AERO 25 W    RMY 24
07/22  80/67/74/+2/…./…/..             16 ENE  AERO M  M    RMY 16
07/23  88/68/78/+6/0.48/…/..             31 N    AERO 32 N    RMY 31
07/24  81/68/75/+3/0.00/…/..             15 ENE  AERO 15 ENE  RMY 16
07/25  88/67/78/+6/0.00/…/..             18 W    AERO 18 WNW  RMY N/A
07/26  89/70/80/+8/0.00/…/..             27 W    AERO 28 W    RMY 27
07/27  94/72/83/+11/0.00/…/..            23 SW   AERO 25 SW   RMY N/A

07/28 The low since midnight is 76F, the daily normal low is 63F

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

RECORDS FOR JULY 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INS IN 1911
PEAK GUST 62 MPH SW IN 2006

RECORDS FOR JULY 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INS IN 1901
PEAK GUST 40e MPH E IN 1941

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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