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Friday, September 24, 2021

September 24, 2021

BLUE HILL METEOROLOGICAL OBSERVATORYMILTON, MASSACHUSETTSELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, SEPTEMBER 24, 2021ALL TIMES ARE IN EASTERN STANDARD…

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

FRIDAY, SEPTEMBER 24, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0534E
SUNSET:  1737E
 
OVERCAST WITH GUSTY SOUTHERLY WINDS…

A very slow moving cold front is meandering eastward across the
northeast bringing a prolonged period of cloudiness, wind, and
humidity. Peak gust so far is 43 MPH out of the SSE. Daily average
wind speed is cranking at 19 MPH! No sunshine observed so far today
and the dew points are juiced up in the low 70s! Due to these
impressive dew points, we are currently tied for the highest minimum
temperature of 68F for this date as of this writing. Forecast models
suggest, however, this value won’t hold as we approach the nighttime
hours, but an indication of how anomalously warm it is.

With regards to precipitation, we noted a few brief passing sprinkles
streaming up from the south. Only 0.01 inch was measured by 1PM.

The high so far today is 74F, 4 degrees above the normal max of
70F. The low since midnight is 68F, a whopping 15 degrees above the
normal low of 53F.

Today’s Observations:

7 A.M.
Weather: Overcast Stratus (few bright spots in overcast distant NE-SE)
Temperature: 72F; Dew Point: 70F; Relative Humidity: 94%
Wind: S @ 20G30 kts
Peak Wind: 35 MPH (30 kts) S @ 6:47 A.M.
Sea-level pressure: 1016.8 mb; 30.03 in. Hg; steady, then falling
Visibility: 15 miles, thin fog  
6-hr Max temp: 72F
6-hr Min temp: 68F
24-hr Precip: 0.09 ins.
BHO SA 1155 15 OVC 15 168/72/70/1820G30/003/ FEW BRGHT SPTS IOVC DSNT
NE-SE THN F ALQDS PK WND 1830/47/ 8/6// 58009 70009 10072 20068

10 A.M.
Weather: Overcast Stratus & Stratus Fractus (virga SSW-NNW)
Temperature: 73F; Dew Point: 69F; Relative Humidity: 88%
Wind: S @ 17G28kts
Peak Wind: 35 MPH (30 kts) S @ 9:18 A.M.
Sea-level pressure: 1017.4 mb; 30.004 in Hg; rising unsteadily
Visibility: 15 miles (10 miles SSW-NNW), thin fog
3-hr Precip: 0.00 ins.
BHO SA 1455 12 OVC 15 174/73/69/1817G28/004/ VSBY SSW-NNE 10
VIRGA SSW-NNW THN F ALQDS PK WND 1830/18/ 8/6// 52006

1 P.M.
Weather: Scattered Stratus Fractus, Overcast Altocumulus/Altostratus
(few breaks in overcast south, virga distant all quads)
Temperature: 73F, Dew point: 70F; Relative Humidity: 90%
Wind: S @ 18G28kts
Peak Wind: 32 MPH (28 kts) S @ 12:45 P.M.
Sea-level pressure: 1016.1 mb; 30.01 in Hg; Rising, then falling
Visibility: 20 miles (thin fog)
6-hr Max temp: 74F
6-hr Min temp: 72F
6-hr Precip: 0.01 ins.
BHO SA 1755 12 SCT 130 OVC 20 161/73/70/1818G28/001/ FEW BINOVC S
VIRGA DSNT ALQDS THN F ALQDS PK WND 1828/45/ 8/65/ 58013 6001/ 10074
20072

SUMMARY FOR THURSDAY, SEPTEMBER 23, 2021

TEMPERATURE (DEGREES F)
MAX…….78     NORMAL…..70
MIN…….65     NORMAL…..53
MEAN……72     NORMAL…..62

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+10
TOTAL DEPARTURE FOR THE MONTH…………………….+29 [+1.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE MONTH……………15  DEPARTURE…….-42
TOTAL HEATING UNITS FOR THE SEASON…………..43  DEPARTURE…….-32
TOTAL HEATING UNITS LAST SEASON TO DATE………97  DEPARTURE…….-54

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….7  DEPARTURE……..+6
TOTAL COOLING UNITS FOR THE MONTH……………56  DEPARTURE…….-12
TOTAL COOLING UNITS FOR THE SEASON………….706  DEPARTURE…….+43
TOTAL COOLING UNITS LAST SEASON TO DATE……..807  DEPARTURE……-101

PEAK WIND GUST (MPH):
                     Official……………….36 SSE @ 11:11 A.M.
                     AEROVANE (south tower)…..37 SSE @ 10:27 A.M.
                     VECTOR #2 (south tower)….40     @ 10:17 A.M.
                     DAVIS #2 (south tower)…..41 S   @ 11:07 A.M.
                     ASOS………..OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
                     RMY…………OUT OF SERVICE D/T RENOVATIONS  
                     MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………29 SSE  @ 11:09 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..26      @ 11:12 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………30 S    @ 11:09 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY AVERAGE……..OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL…….15.8 SE [380 total miles]
                     VECTOR #2……………..16.0
                     DAVIS #2………………15.8 SSE
                     RMY……………..OUT OF SERVICE D/T RENOVATIONS
                     ASOS…………….OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS   

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.09  DEPARTURE….-0.05
TOTAL PRECIPITATION FOR THE MONTH………….5.63  DEPARTURE….+2.62
TOTAL PRECIPITATION FOR THE YEAR………….45.97  DEPARTURE….+8.61

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

09/01   68/56/62/-7/1.47/000/00          34 NNE AERO 37 NNE RMY N/A    
09/02   71/55/63/-6/2.53/322/41          49 ENE AERO 52 ENE RMY N/A
09/03   72/52/62/-6/0.00/735/94          23 NW  AERO 23 NW  RMY N/A
09/04   76/55/66/-2/0.00/757/97          22 WNW AERO 21 WNW RMY N/A
09/05   72/60/66/-2/0.04/008/01          27 S   AERO 29 S   RMY N/A
09/06   80/61/71/+3/0.00/…/..          24 WNW AERO 25 WNW RMY N/A
09/07   78/57/68/+1/0.00/…/..          23 WSW AERO 22 WSW RMY N/A
09/08   81/61/71/+4/0.00/…/..          43 S   AERO 45 S   RMY N/A
09/09   71/64/68/+1/0.90/…/..          33 S   AERO 36 S   RMY N/A
09/10   74/55/65/-1/0.04/…/..          31 NW  AERO 32 WNW RMY N/A
09/11   75/51/63/-3/0.00/…/..          24 SW  AERO 24 SW  RMY N/A
09/12   79/60/70/+4/0.00/…/..          33 SW  AERO 32 SW  RMY N/A
09/13   77/62/70/+5/0.06/…/..          22 NW  AERO 23 NW  RMY N/A
09/14   75/59/67/+2/0.00/…/..          23 S   AERO 25 S   RMY N/A
09/15   82/65/74/+9/T/…/..             32 SSW AERO 35 SSW RMY N/A
09/16   69/61/65/+1/0.27/…/..          24 ENE AERO 24 ENE RMY N/A TSTM      
09/17   66/60/63/-1/0.02/…/..          22 NE  AERO 23 NE  RMY N/A
09/18   74/62/68/+5/0.04/…/..          17 WNW AERO 18 WNW RMY N/A TSTM
09/19   71/57/64/+1/0.15/…/..          23 NNE AERO 24 NNE RMY N/A
09/20   71/55/63/0/0.00/…/..           20 SE  AERO 20 SE  RMY N/A
09/21   75/55/65/+3/0.00/…/..          19 SSE AERO 20 SSE RMY N/A
09/22   75/65/70/+8/…./…/..          30 S   AERO 30 S   RMY N/A
09/23   78/65/72/+10/…./…/..         36 SSE AERO 37 SSE RMY N/A

09/24   The low since midnight is 68F, the daily normal low is 53F

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: Andrew Swanson

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

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§ 02

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§ 03

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§ 05

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Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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