Monday, July 27, 2020

| July 27, 2020 | Reply

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

MONDAY, JULY 27, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

HOT AND HUMID WITH NEAR RECORD HIGH TEMPERATURE…

The heat dome that’s been building over the northeast
is peaking today and tomorrow. The temperature so far
today has reached 93 degrees here on the summit. The
record high for today is 95 degrees set in 1949 and 1963.

In addition to the high heat, humidity levels have
remained on the high side with dew points in the mid
60s. This is yielding heat indices in the upper 90s!

A steady westerly wind is once again blowing today,
helping to maximize the heat across eastern southern
New England.

The high so far today is 93 degrees. This is 12 degrees
above the daily normal high of 81F. The low since
midnight is 72F, which is 9 degrees above the daily
normal low of 63F

Today’s Observations:

7 A.M.
Weather: Scattered Altocumulus, scattered Cirrostratus,
thin broken Cirrus
Temperature: 77F; Dew Point: 65F; Relative Humidity: 67%
Wind: W at 13 kts
Sea-level pressure: 29.81 ins. Hg: falling, then more slowly
Visibility: 35 miles, hazy
6-hr Max temp: 77F
6-hr Min temp: 72F
24-hr Precip: 0.00 ins.
BHO SA 1155 140 SCT 200 SCT 250 –BKN 35 096/77/65/2613/981/
HAZY/ 8/082 51005 10077 20072

10 A.M.
Weather: Thin broken Cirrus, few Altocumulus distant NW-NE
Temperature: 87F; Dew Point: 67F; Relative Humidity: 52%
Wind: W at 8 kts
Sea-level pressure: 29.79 ins. Hg: falling, then more rapidly
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 250 –BKN 30 088/87/67/2708/979/
FEW AC DSNT NW-NE HAZY/ 8/071 58008

1 P.M.
Weather: Thin broken Cirrus, few small cumulus all quadrants
Temperature: 93F; Dew Point: 65F; Relative Humidity: 40%
Wind: W at 9G16 kts
Sea-level pressure: 29.76 ins. Hg: falling, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 93F
6-hr Min temp: 77F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 –BKN 30 078/93/65/2609G16/976/
FEW SML CU ALQDS HAZY/ 8/101 58010 10093 20077

SUMMARY FOR SUNDAY, JULY 26, 2020

TEMPERATURE (DEGREES F)
MAX…..89   NORMAL…..81
MIN…..70   NORMAL…..63
MEAN….80   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………….. +8
TOTAL DEPARTURE FOR THE MONTH……………..+60 [+2.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..15  DEPARTURE……. +7
TOTAL COOLING UNITS FOR THE MONTH…………….224  DEPARTURE…….+39
TOTAL COOLING UNITS FOR THE SEASON……………408  DEPARTURE…….+94
TOTAL COOLING UNITS LAST SEASON TO DATE……….344  DEPARTURE…….+64

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..27 W   AT  2:04 P.M.
AERO…………………….28 W   AT  1:25 P.M.
ASOS…………………….28 W   AT  2:05 P.M.
DAVIS……………………29 W   AT  9:35 A.M
RMY 28  MERLIN 27
FASTEST MILE FOR YESTERDAY………………….22 W   AT  2:35 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 W   AT  2:35 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 W   AT  2:34 P.M.
AVERAGE WIND SPEED AND DIRECTION……………12.8 W
ASOS……………………12.7
DAVIS…………………..13.3 W [264 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.71  DEPARTURE……-1.58
ASOS…………..1.79
TOTAL PRECIPITATION FOR THE YEAR……….29.06  DEPARTURE……-1.20
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 The low since midnight is 72F, 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 27
HIGH 95F IN 1949, 1963
LOW 50F IN 1920, 2001
PRE 4.01 INS IN 1979
WIND 47 MPH ENE IN 1984

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

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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