Tuesday, March 9, 2021

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

TUESDAY, MARCH 9, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0606E
SUNSET:  1744E

SUNNY AND MUCH MILDER TODAY WITH A BRISK WEST WIND…

A snow shower moved through late last evening along the leading
edge of a warmer air mass moving into the region. The
warm front itself moved through pre-dawn this morning with a
couple of rain showers. Warm air advection has been occurring
since with temperatures rising rapidly through the morning.

A freshening west wind is helping temperatures to over-achieve
thanks to downsloping. We have reached the mid 50s here on the
hill as of early this afternoon.

Visibility has been restricted to around 30-35 miles due to
hazy conditions.

We have certainly entered another dry stretch, with no
measurable precipitation occurring in the last 8 days. Total
precipitation for the month to date is only 0.13″, which is
now 1.26″ below normal. The departure for the year has reached
1.68″ below normal.

The high so far today is 55F, 13 degrees above the daily
normal max of 42F. The low since midnight is 30F, 6 degrees
above the daily average low of 24F.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, thin broken cirrus,
few altocumulus castellanus distant S-SSW
Temperature: 35F; Dew Point: 23F; Relative Humidity: 61%
Wind: SW @ 13 kts
Sea-level pressure: 30.22 in Hg; falling, then more slowly
Visibility: 35 miles, hazy
6-hr Max temp: 35F
6-hr Min temp: 32F
24-hr Precip: Trace
24-hr Snow: Trace
Snow Depth: Trace
BHO SA 1155 90 SCT E250 -BKN 35 232/35/23/2213/022/ FEW ACC
DSNT S-SSW HAZY/ 8/081 4/000 56008 6000/ 70000 10035 20032

10 A.M.
Weather: Thin scattered cirrus, few stratocumulus N
Temperature: 47F; Dew Point: 23F; Relative Humidity: 38%
Wind: W @ 12 kts
Sea-level pressure: 30.22 in Hg; rising, then falling
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 250 -SCT 30 233/47/23/2812/022/ FEW SC N HAZY/
8/501 50001

1 P.M.
Weather: Thin scattered cirrus, few stratocumulus distant NNW-NE
Temperature: 55F, Dew point: 27F; Relative Humidity: 33%
Wind: WNW @ 11G17 kts
Sea-level pressure: 30.19in Hg; falling, then more rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 55F
6-hr Min temp: 35F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: Trace
BHO SA 1755 250 -SCT 35 223/55/27/2911G17/019/
FEW SC DSNT NNW-NE HAZY/ 8/501 4/000 58010 10055 20035

SUMMARY FOR MONDAY, MARCH 8, 2021

TEMPERATURE (DEGREES F)
MAX…….38   NORMAL…..42
MIN…….19   NORMAL…..24
MEAN……29   NORMAL…..33

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……..-4
TOTAL DEPARTURE FOR THE MONTH……………….-39 [-5.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………36  DEPARTURE…….+4
TOTAL HEATING UNITS FOR THE MONTH…………..303  DEPARTURE……+39
TOTAL HEATING UNITS FOR THE SEASON…………4348  DEPARTURE…..-484
TOTAL HEATING UNITS LAST SEASON TO DATE…….4343  DEPARTURE…….+5

PEAK WIND GUST (MPH):
420C/Official…………..20 NW  @  6:03 A.M.
AEROVANE (south tower)…..20 NW  @  7:17 A.M.
ASOS…………………..19 NW  @  6:32 A.M.
DAVIS #1……………….19 NNW @  6:03 A.M.
DAVIS #2 (south tower)…..18 NW  @  1:41 A.M.
RMY……………………21     @  6:32 A.M.
VECTOR…………………23     @  6:32 A.M.
MERLIN…………………N/A

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 NW  @  6:26 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 NW  @  6:54 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 NNW @  6:34 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 NNW @  7:18 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..15 NNW @  6:31 A.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..15     @  6:31 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…… 7.6 NW [183 total miles] ASOS………………… 8.1
DAVIS #1…………….. 8.1 WNW
DAVIS #2…………….. 8.1 NW
RMY…………………. 7.7 WNW
VECTOR………………. 8.2

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……TRACE  DEPARTURE….-0.18
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….0.13  DEPARTURE….-1.26
ASOS………….0.16
TOTAL PRECIPITATION FOR THE YEAR…………..8.13  DEPARTURE….-1.68
ASOS…………8.42

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………TRACE  DEPARTURE…. -0.5
TOTAL SNOWFALL FOR THE MONTH……………… 0.1  DEPARTURE…. -4.0
TOTAL SNOWFALL FOR THE SEASON……………..72.5  DEPARTURE….+21.9

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

02/01   32/21/27/+1/1.86/12.7/000/00      53 NE   AERO 65 NE   RMY 62
02/02   34/29/32/+6/0.91/1.6/000/00       52 NNE  AERO 55 NE   RMY 58
02/03   34/26/30/+4/0.01/0.2/036/06       20 NW   AERO 20 NW   RMY 22
02/04   37/26/32/+6/0.02/0.7/158/26       23 NW   AERO 22 NW   RMY M
02/05   39/26/33/+7/0.01/T/000/00         33 S    AERO 32 S    RMY 30
02/06   40/28/34/+8/0.00/0.0/595/97       42 WSW  AERO 41 WSW  RMY 47
02/07   35/25/30/+3/0.71/11.6/000/00      27 WNW  AERO 28 WNW  RMY 30
02/08   27/13/20/-7/0.00/0.0/619/100      29 NW   AERO 31 WNW  RMY 32
02/09   27/18/23/-4/0.17/2.2/000/00       16 N    AERO 16 N    RMY 17
02/10   31/15/23/-4/0.00/0.0/436/70       26 WNW  AERO 25 WNW  RMY 28
02/11   31/15/23/-4/0.00/0.0/526/84       28 NW   AERO 26 NW   RMY 31
02/12   25/8/17/-10/0.00/0.0/421/67       32 NW   AERO 35 NW   RMY 36
02/13   27/15/21/-7/0.00/0.0/252/40       20 NNW  AERO 20 NNW  RMY 23
02/14   34/24/29/+1/0.00/0.0/000/00       19 ENE  AERO 16 ENE  RMY 19
02/15   31/27/29/+1/0.11/0.0/000/00       21 NNE  AERO 21 NNE  RMY 22
02/16   44/29/37/+9/0.63/0.0/000/00       39 W    AERO 41 W    RMY 43
02/17   30/19/25/-3/0.00/0.0/552/86       40 W    AERO 41 WNW  RMY 40
02/18   29/21/25/-4/0.13/1.7/000/00       24 ENE  AERO 24 ENE  RMY 25
02/19   30/24/27/-2/0.66/7.7/000/00       24 NE   AERO 23 NE   RMY 24
02/20   32/19/26/-3/0.02/0.5/156/24       32 NW   AERO 35 NW   RMY 38
02/21   33/15/24/-5/0.00/0.0/653/100      27 NW   AERO 28 NW   RMY 29
02/22   40/21/31/+2/0.22/T/020/03         41 S    AERO 41 SSE  RMY 44
02/23   43/31/37/+7/0.00/0.0/…/..       31 WNW  AERO 31 WNW  RMY 32
02/24   49/34/42/+12/0.00/0.0/…/..      39 SSW  AERO 39 SSW  RMY 42
02/25   43/28/30/+6/0.00/0.0/…/..       50 WNW  AERO 55 WNW  RMY 57
02/26   40/22/31/+1/0.00/0.0/…/..       22 WNW  AERO 22 WNW  RMY 21
02/27   47/29/38/+7/0.21/0.1/…/..       40 SSE  AERO 41 SSE  RMY 44
02/28   41/33/37/+6/0.01/0.0/…/..       24 NW   AERO 22 NW   RMY 25

DAILY RECORDS

02/01 -RECORD SNOWFALL OF 12.7 INS, BREAKING PREVIOUS RECORD
OF 11.0 INS SET IN 1898
02/01 -RECORD PRECIPITATION OF 1.86 INS, BREAKING PREVIOUS
RECORD OF 1.30 INS SET IN 1898

PRELIMINARY CLIMATE SUMMARY FOR MARCH CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

03/01   42/24/33/+2/0.13/T/…/..        69 WNW   AERO 78 WNW  RMY 78
03/02   27/10/19/-12/T/0.1/…/..        63 WNW   AERO 71 WNW  RMY 69
03/03   45/19/32/0/0.00/0.0/…/..       30 W     AERO 30 W    RMY 34
03/04   38/22/30/-2/0.00/0.0/…/..      46 NW    AERO 51 NW   RMY 53
03/05   31/18/25/-7/0.00/0.0/…/..      39 WNW   AERO 44 NW   RMY 45
03/06   33/15/24/-8/0.00/0.0/…/..      28 WNW   AERO 29 WNW  RMY 30
03/07   35/15/25/-8/0.00/0.0/…/..      21 NW    AERO 22 NW   RMY 23
03/08   38/19/29/-4/T/T/…/..           20 NW    AERO 20 NW   RMY 21

03/09 The low since midnight is 30F, the daily normal low is 24F

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

RECORDS FOR MARCH 9
HIGH 75 IN 2016
LOW 1 IN 2007
PRECIP 2.67 INS. IN 1998
SNOWFALL 6.3 INS. IN 2001
PEAK GUST 102e MPH S IN 1942 [RECORD FOR MONTH]

RECORDS FOR MARCH 10
HIGH 69 IN 1977
LOW 2 IN 1984
PRECIP 2.00 INS. IN 1994
SNOWFALL 5.5 INS. IN 1918
PEAK GUST 80 MPH NW IN 1974

TODAY’S REPORT PREPARED BY: Matt Douglas