Sunday, October 19, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, OCTOBER 19, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

BRIEF THUNDERSTORM YESTERDAY AFTERNOON PRECEDES
ARRIVAL OF MUCH COOLER AND DRIER AIR OVERNIGHT

A thunderstorm yesterday afternoon brought a brief downpour
of 0.10 inch in just 5 minutes with a total of 0.24 inch in the
hour from 3 to 4 P.M.
Yesterday completed 5 days with double digits above normal
warmth leaving the month more than 3 degrees warmer than
the average for mid-October.

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus variable overcast, higher altocumulus
overcast, few cumulus distant ESE-S and WSW-WNW, break in the
overcast distant ESE-S, and WSW-WNW
Temperature: 48F; Dew Point: 39F; Wind: SSW at 11 kts
Sea-level pressure: 29.76 ins. Hg, rising then more rapidly
Visibility: 70 miles, except 80 miles, NW
6-hr max temp: 51F
6-hr min temp: 48F
24-hr precip: 0.24 inch
BHO SA 1155 E23 BKN 28V OVC 70 077/48/39/3211/976/
28 OVC V BKN HIER OVC AC 85 HND FEW DSNT CU DSNT ESE-S
AND WSW-WNW BINOVC DSNT WSW-WNW AND DSNT ESE-S ALG HZN
VSBY NW 80/ 8/87/ 53030 MANUAL 70024 ASOS 70023 10051 20048

10 A.M.
Weather: Scattered cumulus, few moderate, broken stratocumulus,
overcast altocumulus, breaks in overcast all quadrants
Temperature: 50F; Dew Point: 38F; Wind: NW at 10 kts,
Sea-level pressure: 29.78 ins. Hg, rising then falling
Visibility: 75 miles
BHO SA 1455 20 SCT E34 BKN 90 OVC 75 086/50/38/3110/978/
FEW MDT CU BINOVC ALQDS/ 8/83/ 50009

WEATHER SUMMARY FOR SATURDAY, OCTOBER 18, 2014

TEMPERATURE (DEGREES F)
MAX…..71   NORMAL…..60
MIN…..52   NORMAL…..42
MEAN….62   NORMAL…..51

DEPARTURE FROM 30-YEAR NORMAL……………………+11
TOTAL DEPARTURE FOR THE MONTH……………………+66 [+3.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………3  DEPARTURE……….-11
TOTAL HEATING UNITS FOR THE MONTH………….142  DEPARTURE……….-64
TOTAL HEATING UNITS FOR THE SEASON…………243  DEPARTURE………-105
TOTAL HEATING UNITS LAST SEASON TO DATE…….259  DIFFERENCE………-16

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………28 WNW AT   5:20 A.M. *
ASOS…………………..30 S   AT  11:20 A.M.
DAVIS………………….30 SSW AT  11:29 A.M. RMY 30
FASTEST MILE FOR YESTERDAY………………..23 SSW AT  12:12 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..24 S   AT  12:12 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….22 SSW AT  11:04 A.M.
AVERAGE WIND SPEED AND DIRECTION…………13.5
ASOS…………………13.3
DAVIS………………..12.7 SW (220 degrees)
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.24  DEPARTURE……..+0.08
ASOS…………..0.23
TOTAL PRECIPITATION FOR THE MONTH……….3.50  DEPARTURE……..+0.82
ASOS…………..3.47
TOTAL PRECIPITATION FOR THE YEAR……….35.09  DEPARTURE……..-6.67
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 morning low temp: 48F since midnight; normal low now 42F

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 19
HIGH 81F IN 1945
LOW 21F IN 1922
PRECIP 3.64 INCHES IN 1932
SNOWFALL 1.0 INCHES IN 1972
PEAK GUST 66 MPH SSW IN 1967

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

TODAY’S REPORT PREPARED BY: Robert Skilling