Monday, October 20, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 20, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

NORTHWEST WINDS USHER IN OVERNIGHT LOWS IN THE 30S

This morning’s low of 33F represents the coldest reading
thus far on top of Blue Hill this season. Many surrounding
areas received the first frosts of the season.

Cool Canadian air also brought excellent visibility for the
7:00 AM EST observation with 80 miles visibility in most
directions.

By the 1:00 PM EST observation a maximum of 54F had been
reached with increasing bands of altocumulus, altocumulus
lenticularis, and cirrus bands becoming denser. Winds had
shifted from the NW very early this morning to SW by
the 1:00 PM EST observation.

Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus distant SW-N, few
altocumulus lenticularis distant NW-N, few cirrus
distant in all directions
Temperature: 34F; Dew Point: 27F; Wind: WSW at 10 kts
Sea-level pressure: 30.06 ins. Hg, rising then more slowly
Visibility: 80 miles, except 70 miles W-N
6-hr max temp: 37F
6-hr min temp: 33F
24-hr precip: 0.00 inch
BHO SA 1155 CLR 80 179/34/27/2510/006/ VSBY W-N 70 MI FEW AC DSNT
SW-N FEW ACSL DSNT NW-N FEW CI DSNT ALQDS/ 8/041 51016 10037 20033

10 A.M.
Weather: Clear, few altocumulus distant SW-E,
few altocumulus lenticularis SW-NNE, few cirrus distant SE-N
Temperature: 48F; Dew Point: 29F; Wind: SW at 8 kts,
Sea-level pressure: 30.06 ins. Hg, rising slightly
Visibility: 70 miles, 80 miles NE
BHO SA 1455 CLR 70 180/48/29/2208/006/ VSBY NE 80 MI
FEW AC DSNT SW-E FEW ACSL SW-NNE FEW CI DSNT SE-N/ 8/041 50001

1 P.M.
Weather: Scattered altocumulus, scattered cirrus fibratus
growing more dense
Temperature: 54F; Dew Point: 31F; Wind: SW at 10G16 kts,
Sea-level pressure: 30.00 ins. Hg, falling, then more quickly
Visibility: 70 miles, 80 miles NE
6-hr precip: 0.00 inches
BHO SA 1755 140 SCT 250 SCT 70 158/54/31/2310G16/000/
VSBY NE 80 MI FEW ACSL DSNT WNW-N/ 8/052 58022 10054 20034

WEATHER SUMMARY FOR SUNDAY, OCTOBER 19, 2014

TEMPERATURE (DEGREES F)
MAX…..55   NORMAL…..59
MIN…..39   NORMAL…..42
MEAN….47   NORMAL…..50

DEPARTURE FROM 30-YEAR NORMAL…………………….-3
TOTAL DEPARTURE FOR THE MONTH……………………+63 [+3.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..18  DEPARTURE………..+3
TOTAL HEATING UNITS FOR THE MONTH………….160  DEPARTURE……….-61
TOTAL HEATING UNITS FOR THE SEASON…………261  DEPARTURE………-102
TOTAL HEATING UNITS LAST SEASON TO DATE…….269  DIFFERENCE……….-8

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………28 NW  AT   4:56 P.M.
ASOS…………………..31 NW  AT   4:56 P.M.
DAVIS………………….29 NW  AT  11:19 A.M. RMY 29
FASTEST MILE FOR YESTERDAY………………..22 NW  AT   4:56 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE……………..21 NW  AT   4:56 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….19 NW  AT  11:19 A.M.
AVERAGE WIND SPEED AND DIRECTION…………12.4 NW
ASOS…………………12.1
DAVIS………………..10.4 NW (308 degrees)
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……..-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.50  DEPARTURE……..+0.67
ASOS…………..3.47
TOTAL PRECIPITATION FOR THE YEAR……….35.09  DEPARTURE……..-6.82
ASOS………….35.27

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

10/1  56/55/56/-1/1.63/000/00              33 NE  RMY 36
10/2  55/47/51/-6/0.29/000/00              30 NE  RMY N/A
10/3  54/46/50/-6/0.05/000/00              20 NE  RMY 20
10/4  63/52/58/+2/0.30/000/00              30 SE  RMY 32
10/5  60/45/53/-3/0.00/658/95              26 W   RMY 28
10/6  66/42/54/-1/0.00/669/97              25 SSE RMY N/A
10/7  72/54/63/+8/0.01/281/38              43 S   RMY 49
10/8  72/53/63/+9/0.01/562/82              40 S   RMY N/A
10/9  64/48/56/+2/0.00/648/95              35 W   RMY 39
10/10 63/43/53/-1/0.00/489/72              23 W   RMY N/A
10/11 50/43/47/-6/0.35/000/00              15 N   RMY N/A
10/12 60/40/50/-3/0.00/…/..              20 NW  RMY N/A
10/13 61/45/53/+0/0.00/…/..              23 S   RMY 25
10/14 75/58/67/+15/0.00/…/..             29 S   RMY 31
10/15 79/62/71/+18/0.02/…/..             32 SSW RMY 36
10/16 70/60/65/+14/0.60/000/00             37 S   RMY 41
10/17 71/57/64/+13/0.00/…/..             28 SW  RMY 30
10/18 71/52/62/+11/0.24/…/..             28 WNW RMY 30 TSTM
10/19 55/39/47/-3/0.00/…/..              28 NW  RMY 29

10/20 morning low temp: 33F since midnight; normal low now 41F

DAILY RECORDS FOR OCTOBER 2014:
10/1 – A NEW RECORD DAILY PRECIPITATION OF 1.63 INCHES;
surpasses the previous record of 1.44 ins. in 1984

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

RECORDS FOR OCTOBER 20
HIGH 78F IN 1965,1984
LOW 24F IN 1972
PRECIP 7.10 INCHES IN 1996 (RECORD FOR MONTH)
SNOWFALL TRACE IN 1934,1943
PEAK GUST 63 MPH W IN 1966

RECORDS FOR OCTOBER 21
HIGH 79F IN 1979
LOW 24F IN 1974
PRECIP 2.39 INCHES IN 1944
SNOWFALL TRACE IN 1895,1907,1940
PEAK GUST 69e MPH S IN 1976

TODAY’S REPORT PREPARED BY: Brian Fitzgerald