Tuesday, September 24, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 24, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

COOLER AND MUCH LESS HUMID TODAY…

After yesterday’s hot and humid weather, a cold front moved
through overnight bringing with it showers and thunderstorms to
the area. Only 0.04″ of rain fell at the Observatory just after
midnight.

Today has transitioned into a top notch day. A mix of sun and
clouds has been the theme with lowering dew points. A westerly
breeze has only added to the cooler feel of the day.

The high so far today has been 75F, which is still 6 degrees
above the normal high of 69F. The low since midnight was 62F,
which is 10 degrees above our normal low of 52F.

Today’s Observations:

7 A.M.
Weather: Clear; few stratus fractus distant ESE-S, few moderate cumulus
distant W-N, altocumulus layer distant NE-SE-S, few altocumulus W-NW
Temperature: 63F; Dew Point: 61F; Wind: W at 10 kts, gusting to 18 kts
Sea-level pressure: 29.73 ins. Hg, rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 66F
6-hr Min temp: 62F
24-hr Precip: 0.04 ins.
BHO SA 1155 CLR 60 069/63/61/2610G18/973/ FEW STFRA DSNT ESE-S
FEW MDT CU DSNT W-N AC LYR DSNT NE-SE-S FEW AC DSNT W-NW/
8/530 51006 70004 10066 20062

10 A.M.
Weather: Scattered cumulus, scattered cirrus; cumulonimbus distant WNW-NW
Temperature: 72F; Dew Point: 56F; Wind: W at 13 kts, gusting to 20 kts
Sea-level pressure: 29.73 ins. Hg, steady, then falling
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 30 SCT 200 SCT 60 067/72/56/2813G20/973/ CB DSNT
WNW-NW/ 8/904 58002

1 P.M.
Weather: Scattered cumulus, cumulonimbus distant N-NNE, few cirrus distant
W-NW and NE-E
Temperature: 74F; Dew Point: 54F; Wind: W at 9 kts
Sea-level pressure: 29.71 ins. Hg, falling, then steady
Visibility: 70 miles
6-hr Max temp: 75F
6-hr Min temp: 62F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 70 060/74/54/2709/971/ CB DSNT N-NNE FEW CI
DSNT W-NW AND NE-E/ 8/901 55007 10075 20062

SUMMARY FOR MONDAY, SEPTEMBER 23, 2019

TEMPERATURE (DEGREES F)
MAX…..88   NORMAL…..69
MIN…..65   NORMAL…..52
MEAN….77   NORMAL…..60

DEPARTURE FROM 30-YEAR NORMAL…………………+17
TOTAL DEPARTURE FOR THE MONTH………………… +1 [-0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON AUG TO JUL)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-6
TOTAL HEATING UNITS FOR THE MONTH…………..64   DEPARTURE………-4
TOTAL HEATING UNITS FOR THE SEASON………….76   DEPARTURE……..-11
TOTAL HEATING UNITS LAST SEASON TO DATE……..44   DEPARTURE……..+32

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..12   DEPARTURE……..+11
TOTAL COOLING UNITS FOR THE MONTH…………..53   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE SEASON…………672   DEPARTURE……..+81
TOTAL COOLING UNITS LAST SEASON TO DATE…….855   DEPARTURE…….-183

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 SSW AT  2:54 P.M.
AERO…………………….28 SSW AT  2:53 P.M.
ASOS…………………….30 SSW AT  2:54 P.M.
DAVIS……………………31 S   AT  2:50 P.M. RMY 29
FASTEST MILE FOR YESTERDAY………………….22 SSW AT  2:54 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….22 SSW AT  3:07 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………21 SSW AT  2:53 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….14.6 SSW
ASOS…………………….14.8
DAVIS……………………13.8 SSW [212 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.04  DEPARTURE……-0.11
ASOS…………..0.03
TOTAL PRECIPITATION FOR THE MONTH……….1.02  DEPARTURE……-2.00
ASOS…………..0.98
TOTAL PRECIPITATION FOR THE YEAR……….38.17  DEPARTURE……+0.12
ASOS………….38.02

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/01  73/56/65/-3/0.00/…/..                21 ENE AERO 14 ENE RMY 18
9/02  75/57/66/-2/0.37/…/..                39 W   AERO 41 W   RMY 41
9/03  77/61/69/+2/0.00/…/..                18 S   AERO 16 S   RMY N/A
9/04  83/61/72/+5/0.00/…/..                30 SW  AERO 28 SW  RMY 30
9/05  68/54/61/-6/0.00/…/..                23 NW  AERO 17 NW  RMY N/A
9/06  65/56/61/-6/0.03/…/..                37 ENE AERO 36 ENE RMY 36
9/07  70/51/61/-5/0.27/…/..                37 N   AERO 37 N   RMY N/A
9/08  73/53/63/-3/0.00/…/..                25 W   AERO 21 W   RMY N/A
9/09  71/54/63/-3/0.00/…/..                17 SE  AERO 16 SE  RMY 16
9/10  73/57/65/0/0.00/…/..                 25 S   AERO 25 S   RMY N/A
9/11  83/63/73/+8/0.00/…/..                31 SW  AERO 32 SW  RMY N/A
9/12  70/52/61/-4/0.11/…/..                29 ENE AERO 28 ENE RMY 28
9/13  65/49/57/-7/0.00/…/..                29 ENE AERO 27 ENE RMY 27
9/14  69/49/59/-5/0.19/…/..                36 S   AERO 37 S   RMY 37
9/15  78/62/70/+6/0.00/…/..                24 W   AERO 23 W   RMY 22
9/16  72/54/63/0/0.00/…/..                 25 WNW AERO 23 WNW RMY 25
9/17  67/49/58/-5/0.00/…/..                23 NW  AERO 23 N   RMY N/A
9/18  61/49/55/-7/0.00/…/..                26 NE  AERO 25 NE  RMY 25
9/19  67/43/55/-7/0.00/…/..                17 NE  AERO 18 NE  RMY N/A
9/20  78/50/64/+2/0.00/…/..                21 W   AERO 18 W   RMY 20
9/21  83/60/72/+11/0.00/…/..               21 WNW AERO 18 WNW RMY N/A
9/22  85/62/74/+13/0.00/…/..               24 SW  AERO 23 SW  RMY 25
9/23  88/65/77/+17/0.00/…/..               29 SSW AERO 28 SSW RMY 29

9/24  The low since midnight is 62F, normal daily minimum is 52F

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

RECORDS FOR SEPTEMBER 24
HIGH 87F IN 1959
LOW 33F IN 1885,1950,1963
PRECIP 1.19 INCHES IN 1955
PEAK GUST 54e MPH SW IN 1940

RECORDS FOR SEPTEMBER 25
HIGH 87F IN 1970
LOW 31F IN 1950
PRECIP 2.68 INCHES IN 1961
PEAK GUST 63 MPH SSW IN 1991

TODAY’S REPORT PREPARED BY: Matt Douglas