Tuesday, February 5, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, FEBRUARY 5, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A SLIGHTLY WARMER DAY THAN YESTERDAY, WITH
NEAR CLOUDLESS SKIES IN THE AFTERNOON….

We observed near overcast skies this morning become
almost clear at the 1 P.M. observation. Wind has shifted
SW to W throughout the day, with a peak gust so far of
29 mph. Visibility was highest in the afternoon at 50
miles. Warm and dry air continues to dominate the region,
with a humidity of 50% by noontime and a high so far today
of 61F. That is 26 degrees above the daily normal maximum
of 35F. The low since midnight is 40F, 23 degrees above the
normal minimum of 17F.
PRELIMINARY STATS FOR JANUARY 2019

TEMPERATURE, Deg. F
Avg. Max. 34.3 [+0.5] Avg. Min. 17.9 [+0.8] Mean      26.1 [+0.6] 24-hour corrected mean: 26.6
Max. for month: 57F on  24th
Min. for month: 32F on  5th

HEATING DEGREE DAYS
Total heating units:   1200 [-26] Total for the season:  3496 [-35] Total for last season: 3321

PRECIPITATION, Inches
Total: 5.35 [-0.18] Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 4.7 [-12.4] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 13.4
Avg. corrected wind speed: 13.7
Prevailing wind direction: NW at 19%
Peak gust and direction: 77 S on 24th

SUNSHINE:
Campbell-Stokes card minutes: 8988 minutes of possible 17130 or 52%
Astronomical total minutes:   9273 minutes of possible 17650 or 53%

Today’s Observations:

7 A.M.
Weather: Broken altocumulus and cirrocumulus
Temperature: 45F; Dew Point: 41F; Wind: SW at 15G21 kts
Sea-level pressure: 29.96 ins. Hg, falling then rising
Visibility: 30 miles, distant haze in all directions
6-hr Max temp: 45F
6-hr Min temp: 40F
24-hr Precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E160 BKN 250 BKN 30 145/45/41/2215G21/996/
DSNT HZ ALQDS/ 8/079 50001 10045 20040

10 A.M.
Weather: Broken altocumulus
Temperature: 50F; Dew Point: 40F; Wind: SW at 14G18 kts
Sea-level pressure: 29.94 ins. Hg, falling steadily
Visibility: 45 miles, thin smoke layer along horizon
3-hr Precip: 0.00 ins.
BHO SA 1455 E160 BKN 45 141/50/40/2214G18/994/
THN K LYR ALQDS/ 8/070 58004

1 P.M.
Weather: Scattered altocumulus
Temperature: 60F; Dew Point: 43F; Wind: W at 13G22 kts
Sea-level pressure: 29.90 ins. Hg, falling steadily
Visibility: 50 miles
6-hr Max temp: 61F
6-hr Min temp: 45F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1755 110 SCT 50 125/60/43/2713G22/990/ 8/080
58016 10061 20045

SUMMARY FOR MONDAY, FEBRUARY 4, 2019

TEMPERATURE (DEGREES F)
MAX…..59   NORMAL…..35
MIN…..33   NORMAL…..17
MEAN….46   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL…………………..+20
TOTAL DEPARTURE FOR THE MONTH……………………+6 [+1.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..19   DEPARTURE……..-20
TOTAL HEATING UNITS FOR THE MONTH………….150   DEPARTURE………-6
TOTAL HEATING UNITS FOR THE SEASON………..3646   DEPARTURE……..-41
TOTAL HEATING UNITS LAST SEASON TO DATE……3475   DIFFERENCE……+171

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 SSW AT  2:27 A.M.
AERO…………………….28 SSW AT  3:08 A.M.
ASOS…………………….29 SSW AT  2:16 A.M.
DAVIS……………………29 SSW AT  2:16 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….21 S   AT  2:28 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 S   AT  2:58 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 SSW AT  2:58 A.M.
AVERAGE WIND SPEED AND DIRECTION………….13.7 SSW
ASOS………………….14.1
DAVIS…………………13.1 SW [214 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……….0.00  DEPARTURE…….-0.54
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR………..5.35  DEPARTURE…….+0.46
ASOS…………..5.48

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE……..-2.0
TOTAL SNOWFALL FOR THE SEASON…………..12.4  DEPARTURE…….-22.7

PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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

01/01 54/29/42/+15/…./0.0/386/72         53 W   AERO 53 W   RMY 54
01/02 34/24/29/+2/…./…/432/81          22 NW  AERO 22 NW  RMY N/A
01/03 42/28/35/+9/0.01/T/228/43            28 WNW AERO 30 WNW RMY 30
01/04 43/30/37/+11/…./…/354/66         29 SW  AERO 29 SW  RMY 29
01/05 41/32/37/+11/1.19/000/000/00         26 NE  AERO 25 NNW RMY 27
01/06 42/21/32/+6/0.00/0.0/300/56          42 NW  AERO 46 NW  RMY 50
01/07 26/14/20/-6/…/…/474/88 37 NW  AERO 41 NW  RMY N/A
01/08 40/24/32/+6/…/…/000/00           24 SSE AERO 23 SSE RMY N/A
01/09 42/31/37/+11/…/…/084/16          44 W   AERO 46 WNW RMY 45
01/10 32/20/26/+1/T/T/090/17               37 NW  AERO 41 NW  RMY 43
01/11 26/12/19/-6/0.00/0.0/366/68          36 WNW AERO 37 WNW RMY 38
01/12 26/9/18/-7/0.00/0.0/486/89           32 NW  AERO 32 NW  RMY 29
01/13 25/11/18/-7/0.00/0.0/456/84          18 NNW AERO 16 NW  RMY N/A
01/14 27/20/24/-1/0.00/0.0/120/22          20 NNE AERO 17 N   RMY N/A
01/15 34/18/26/1/0.00/0.0/402/73 22 NW  AERO 21 NNW RMY N/A
01/16 34/23/29/+4/0.00/0.0/270/47          33 W   AERO 32 W   RMY 35
01/17 27/13/20/-5/0.00/0.0/480/87          30 NNW AERO 28 NW  RMY N/A
01/18 40/21/31/+6/0.00/0.0/156/28          18 WNW AERO 18 WNW RMY N/A
01/19 31/24/28/+3/…/1.6/198/36           30 E   AERO 30 E   RMY N/A
01/20 33/3/18/-7/…/…/000/00            39 ENE AERO 43 ENE RMY 39
01/21 3/-2/1/-24/0.00/0.0/348/62           32*WNW AERO 41 WNW RMY M
01/22 24/0/12/-13/0.00/0.0/522/93          28 NW  AERO 30 NW  RMY 29
01/23 46/15/31/+6/0.00/0.0/000/00          37 SSW AERO 39 SSW RMY N/A
01/24 57/31/44/+19/1.44/0.0/000/00         77 S   AERO 79 S   RMY N/A
01/25 37/23/30/+5/0.00/0.0/378/66          41 WNW AERO 46 WNW RMY N/A
01/26 33/17/25/0/0.00/0.0/534/94           25 W   AERO 25 W   RMY 27
01/27 44/24/34/+9/0.00/0.0/480/84          39 S   AERO 39 S   RMY 41
01/28 30/19/28/+3/…./…/348/60          28 NW  AERO 28 NW  RMY N/A
01/29 32/19/26/+1/…./…/072/13          22 SE  AERO 21 E   RMY N/A
01/30 36/3/20/-6/…./0.5/504/88           52 W   AERO 53 W   RMY 57
01/31 14/-2/6/-20/0.00/0.0/570/99          33 WNW AERO 35 WNW RMY N/A

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 19/5/12/-14/0.00/0.0/…/..          29 W   AERO 28 W   RMY N/A
02/02 30/7/19/-7/0.00/0.0/…/..           32 WSW AERO 32 WSW RMY 31
02/03 38/27/26/+7/0.00/0.0/…/..          26 S   AERO 25 S   RMY N/A
02/04 59/33/46/+20/0.00/0.0/…/..         25 SSW AERO 28 SSW RMY N/A

02/05 Low temp since midnight is 40F; normal low is 17F

*Official gust chart reading low on 1/21/19

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

RECORDS FOR FEBRUARY 5
HIGH 65F IN 1991
LOW -14F IN 1918
PRECIP 1.55 INS. IN 2001
SNOWFALL 16.0 INS. IN 1907
PEAK GUST 67 MPH WNW IN 1969

RECORDS FOR FEBRUARY 6
HIGH 54F IN 1909
LOW -10F IN 1895
PRECIP 1.88 INS. IN 1896
SNOWFALL 13.0 INS. IN 1978 [BLIZZARD OF 1978] PEAK GUST 84e MPH NE IN 1978

TODAY’S REPORT PREPARED BY: Benjamin Turner