Friday, November 21, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, NOVEMBER 21, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

A SECOND INSTALLMENT OF ARCTIC AIR ARRIVED OVERNIGHT INTO TODAY
TEMPERATURES STRUGGLED TO REACH LOW 30’S WITH GUSTY WINDS
WINDY WITH GUSTS FROM WNW 30 TO 35 MPH

After a one day break yesterday from the unseasonably cold
weather it was back to much colder and windy today.  During
yesterday afternoon the thermometer touched 47 degrees but
after a 23-degree low this morning the early afternoon readings
today were in the low 30’s, barely breaking above freezing.
We’re watching for ice formation on the nearby ponds but none
is seen as yet.

Today’s Observations:

7 A.M.
Weather: Clear sky, cumulus/stratocumulus along and offshore to the
distant NNE-ESE-SSW
Temperature: 23F; Dew Point: 12F; Wind: W at 13 kts
Sea-level pressure: 30.03 ins. Hg, rising
Visibility: 35 miles, except 45 miles WNW, distant haze
6-hr max temp: 27F
6-hr min temp: 23F
24-hr precip: 0.00 inch
BHO SA 1155 CLR 35 168/23/12/2713/003/ CU/SC ALG/OFFSHR DSNT NNE-SSW
VSBY WNW 45 DSNT HZ/ 8/500 53020 10027 20023

10 A.M.
Weather: Clear, cumulus/stratocumulus generated by cumulus distant
W-N-ESE
Temperature: 30F; Dew Point: 11F; Wind: WNW at 13G18 kts
Sea-level pressure: 30.10 ins. Hg, falling then more quickly
Visibility: 50 miles, light distant haze
BHO SA 1455 CLR 50 192/30/11/2913G18/010/ CU/SC DSNT W-N-ESE ALG HRZN
LGT DSNT HZ GST 23 KTS PST HR/ 8/400 51024

1 P.M.
Weather: Scattered cumulus and stratocumulus generated by cumulus
Temperature: 33F; Dew Point: 10F; Wind: WNW at 16G24 kts
Sea-level pressure: 30.12 ins. Hg, rising slightly
Visibility: 60 miles, light distant haze, virga distant WNW-NW
6-hr max temp:
6-hr min temp: 23F
6-hr precip: 0.00 ins.
BHO SA 1755 55 SCT 60 200/33/10/3016G24/012/ CU/SCCG ALQDS
VIRGA DSNT WNW-NW PK WND 2927/35/ 8/400 53008 10033 20023

SUMMARY FOR THURSDAY, NOVEMBER 20, 2014

TEMPERATURE (DEGREES F)
MAX…..47   NORMAL…..49
MIN…..26   NORMAL…..32
MEAN….37   NORMAL…..40

8DEPARTURE FROM 30-YEAR NORMAL…………………….-3
TOTAL DEPARTURE FOR THE MONTH…………………….-35 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..28  DEPARTURE………..+3
TOTAL HEATING UNITS FOR THE MONTH………….467  DEPARTURE……….+35
TOTAL HEATING UNITS FOR THE SEASON…………889  DEPARTURE………-106
TOTAL HEATING UNITS LAST SEASON TO DATE…….897  DIFFERENCE……… -8

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………35 WSW AT  2:43 P.M.
ASOS…………………..39 WSW AT  2:43 P.M.
DAVIS………………….37 SW  AT  2:43 P.M. RMY 41
FASTEST MILE FOR YESTERDAY………………..28 WSW AT  2:44 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..28 WSW AT  2:44 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….26 WSW AT  2:44 P.M.
AVERAGE WIND SPEED AND DIRECTION…………14.8 SSW
ASOS…………………13.9
DAVIS………………..13.2 WSW (240 degrees)
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…..-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.70  DEPARTURE…..+0.55
ASOS…………..3.73
TOTAL PRECIPITATION FOR THE YEAR……….45.25  DEPARTURE…..-1.67
ASOS………….45.60

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH…………….5.3  DEPARTURE……+4.4
TOTAL SNOWFALL FOR THE SEASON……………5.3  DEPARTURE……+4.1

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

11/1  45/36/41/-5/0.79/0.0/000/00              35 NNE RMY N/A
11/2  37/32/35/-11/0.29/1.8/000/00             46 NW  RMY 49
11/3  50/30/45/-6/0.00/0.0/584/95              39 WNW RMY 43
11/4  61/44/53/+8/0.00/0.0/208/34              28 SSW RMY 32
11/5  66/50/58/+13/0.00/0.0/006/01             29 SSW RMY N/A
11/6  52/45/49/+4/0.58/0.0/000/00              23 NE  RMY 24
11/7  46/34/40/-5/0.00/0.0/079/13              39 NW  RMY 42
11/8  47/30/39/-5/0.00/0.0/555/92              24 W   RMY 25
11/9  56/38/47/+3/0.00/0.0/204/34              23 SSW RMY N/A
11/10 58/40/49/+5/0.00/0.0/592/99              17 S   RMY 20
11/11 61/43/52/+9/0.00/0.0/358/60              22 S   RMY 25
11/12 59/40/50/+7/0.00/0.0/…/..              22 W   RMY 25
11/13 49/32/41/-2/0.08/T/…/..                21 NW  RMY N/A
11/14 41/27/34/-8/0.00/0.0/…/..              23 NW  RMY 27
11/15 37/24/31/-11/0.00/0.0/…/..             23 NW  RMY 23
11/16 39/26/33/-9/0.00/0.0/…/..              17 S   RMY 19
11/17 52/34/43/+2/1.67/0.0/000/00              29 ENE RMY 31
11/18 44/23/34/-7/0.00/0.0/…/..              33 W   RMY 39
11/19 35/19/27/-14/0.00/0.0/…/..             31 WSW RMY N/A
11/20 47/26/37/-3/0.00/0.0/…/..              35 WSW RMY 41

11/21 morning low temp: 23F since midnight; normal low now 32F

DAILY RECORDS FOR NOVEMBER 2014:
11/2  – A NEW RECORD DAILY SNOWFALL: 1.8 INCHES;
surpasses the previous record of 0.2 ins. in 1906, 1951
11/14 – DAILY SNOWFALL RECORD EQUALED: 3.5 INCHES;
ties previous record on this date in 1997

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

RECORDS FOR NOVEMBER 21
HIGH 69 IN 1931
LOW 10 IN 1888
PRECIP 2.60 INCHES IN 1950
SNOWFALL 4.0 INS IN 1929
PEAK GUST 69 NW IN 1989

RECORDS FOR NOVEMBER 22
HIGH 70 IN 1931
LOW 12 IN 1987
PRECIP 1.78 INS IN 2005
SNOWFALL 9.0 INS IN 1971
PEAK GUST 70e SE IN 1945

TODAY’S REPORT PREPARED BY: Robert Skilling