Tuesday, October 20, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 20, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

MAJOR WARMING TREND AFTER COLDEST OF THE SEASON

Temperatures bottomed out at 26 degrees early
yesterday but had risen to 60 degrees by noon today.
The turn-around occurred last evening around 8 p.m.
EDT when the low temperature for last night occurred.
around 8 p.m. at 40 degrees. Rising temperatures did
occur for the rest of last night and have continued
into today.
Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, overcast altocumulus, few altocumulus
castellanus distant S-SSW, large break in overcast SE
Temperature: 48F; Dew Point: 33F; Wind: SW at 13 kts,
Sea-level pressure: 30.16 ins. Hg, about steady
Visibility: 35 miles, 30 miles W-N, 40 miles NE-E
6-hr Max temp: 48F
6-hr Min temp: 44F
24-hr precip: 0.00 ins.
BHO SA 1155 80 SCT E130 OVC 35 214/48/33/2213/016/ FEW ACC DSNT
S-SSE LGE BINOVC SE DRK DSNT W-NNE VSBY W-N 30 NE-E 40 HZY XCPT
NE-E/ 8/08/ 55001 10048 20044

10 A.M.
Weather: Broken altocumulus of a chaotic sky, few altocumulus,
castellanus, dense cirrus distant W, patches clear sky E-S-SW
Temperature: 58F; Dew Point 35F; Wind: SW at 12 kts,
Sea-level pressure: 30.14 ins. Hg, falling then more rapidly
Visibility: 35 miles, except 45 miles WNW, distant haze
BHO SA 1455 E95 BKN 200 BKN 35 208/58/35/2212/014/ AC CHAOTIC
PTCHS CLR SKY E-S-SW DNS CI DSNT W DSNT HZ VSBY WNW 45/
8/092 56006

1 P.M.
Weather: Broken altocumulus, clear sky band extending SE-SW
Temperature: 63F; Dew Point 37F; Wind: SW at 13G19 kts,
Sea-level pressure: 30.10 ins. Hg, falling then more quickly
Visibility: 55 miles, distant haze
BHO SA 1755 E110 BKN 55 193/63/37/2313G19/010/ CLR SKY BND
SE-SW DSNT HZ/ 8/090 58015 10065 20048

SUMMARY FOR MONDAY, OCTOBER 19, 2015

TEMPERATURE (DEGREES F)
MAX…..47   NORMAL…..59
MIN…..26   NORMAL…..42
MEAN….37   NORMAL…..50

DEPARTURE FROM 30-YEAR NORMAL………………….-13
TOTAL DEPARTURE FOR THE MONTH………………….-23  [-1.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH……………0   DEPARTURE……….-5
TOTAL COOLING UNITS FOR THE SEASON…………810   DEPARTURE……..+208
TOTAL COOLING UNITS LAST SEASON TO DATE…….595   DIFFERENCE…….+215

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..28   DEPARTURE………+13
TOTAL HEATING UNITS FOR THE MONTH………….238   DEPARTURE………+17
TOTAL HEATING UNITS FOR THE SEASON…………281   DEPARTURE………-82
TOTAL HEATING UNITS LAST SEASON TO DATE…….261   DIFFERENCE……..+20

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25   SSW AT  11:20 P.M. *
ASOS……………………30   SSW AT   8:49 P.M.
DAVIS…………………..28   SW  AT   8:36 P.M. RMY 30
FASTEST MILE FOR YESTERDAY…………………22   SSW AT  11:23 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………22   SSW AT  11:23 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20   SSW  AT  8:47 P.M.
AVERAGE WIND SPEED AND DIRECTION………….12.0   NNW
ASOS………………….12.5
DAVIS…………………10.4   W [280 Deg.]

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………..1.06  DEPARTURE…..-1.77
ASOS……………1.04
TOTAL PRECIPITATION FOR THE YEAR………..35.20  DEPARTURE…..-6.71
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings

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  55/51/53/-4/…./000/00               39 NE  RMY N/A
10/2  51/47/49/-8/…./000/00               40 NE  RMY 43
10/3  51/45/48/-8/…./000/00               38 NE  RMY N/A
10/4  55/49/52/-4/0.00/474/68               35 E   RMY 40
10/5  59/46/53/-3/T/125/18                  21 NE  RMY 20
10/6  68/43/56/+1/0.00/663/96               17 NW  RMY 17
10/7  69/46/58/+3/0.00/640/93               20 W   RMY 20
10/8  63/49/56/+2/0.00/678/99               21 S   RMY N/A
10/9  68/50/59/+5/0.27/…/..               45 S   RMY 49
10/10 59/44/53/-2/0.00/…/..               33 NNW RMY N/A
10/11 67/46/57/+4/0.00/…/..               26 SW  RMY 28
10/12 76/50/63/+10/0.00/…/..              22 SSW RMY 24
10/13 70/55/63/+10/0.27/…/..              23 S   RMY 24
10/14 66/46/56/+4/0.00/…/..               26 W   RMY 29
10/15 60/41/51/-1/0.00/…/..               20 SW  RMY 27
10/16 60/44/52/+1/T/…/..                  31 W   RMY 34
10/17 54/35/45/-6/T/…/..                  30 WNW RMY 33
10/18 45/28/37/-14/0.00/…/..              24 NNW RMY 25
10/19 47/26/37/-13/0.00/…/..              25 SSW RMY 30

10/20 low since midnight is 43F; normal low is now 41F

DAILY RECORDS FOR OCTOBER 2015

-NONE SO FAR.

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: Robert Skilling