Thursday, September 25, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 25, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

IMPORTANT RAIN AREA WELL TO OUR SOUTH BEING BLOCKED BY HIGH PRESSURE
THE MOST BADLY NEEDED RAINFALL IS NEEDED JUST SOUTH OF BOSTON
SMALL AMOUNTS OF RAINFALL THROUGH 2 P.M. EDT TO OUR SOUTH

A large area of significant rainfall well to our south today
is running into a block of high pressure and dry air while edging
northward.  It’s not making much progress.
As of 6 hours ending 2 P.M. no rain has fallen here at Blue Hill:

Taunton  0.02
Plymouth trace
Chatham    0.06
Providence 0.02
Westerly   0.14

Most of Cape Cod has only a trace to a few hundredths while
the Islands to the south report up to 0.2 inch rainfall.
Only very small amounts of rain have fallen in Rhode Island
and Connecticut.

HERE AT BLUE HILL…
Only 0.26 inches of precipitation has been recorded for
the month of September with less than one week left in the month.
The driest September on record of 0.45 inches, back in 1914, may
be in jeopardy depending on what rain may fall today and
during tonight.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, few altocumulus lenticularis,
overcast altostratus, break in overcast with cirrus visible
distant WNW-NNE, with thin spots and small break in clouds
Temperature: 53F; Dew Point: 50F; Wind: NE at 8 kts,
Sea-level pressure: 30.49 ins. Hg, falling, then more slowly
Visibility: 20 miles, except 30 miles NE, 15 miles SW, hazy,
patch dense fog 15 WNW, mountain summit WNW 20 clearly visible
above fog patch and inversion
6-hr max temp: 54F
6-hr min temp: 52F
24-hr precip: 0.00
BHO SA 1155 110 SCT E150 OVC 20 326/53/50/0508/049/  FEW PTCHS ACSL
HIER CLDS VSB WNW-NNE/LYR AT 220/THN SPTS/SML BINOVC DSNT WNW-NNE
SUN DMLY VSB VSBY NE 30 SW 15 HAZY ALQDS PTCH DNS FG 15 WNW SMT MTN
20 WNW CLRLY VSB ABV FG/ 8/071 56010 10054 20052

10 A.M.
Weather: Scattered stratocumulus, overcast nimbostratus, bright
spots in overcast, sun occasionally dimly visible
Temperature: 58F; Dew Point: 51F; Wind: ENE at 9 kts,
Sea-level pressure: 30.47 ins. Hg, falling then more slowly
Visibility: 35 miles, distant haze
BHO SA 1455 25 SCT E32 OVC 35 317/58/51/0709/047/ BRGHT SPTS IOVC
SUN OCNL DMLY VSB DSNT HZ/ 8/52/ 56009

1 P.M.
Weather: Scattered stratus fractus, overcast nimbostratus,
stratus fractus SE-SW, bright spots in overcast NE, VIRGA
distant SE-WSW
Temperature: 58F; Dew Point: 51F; Wind: ENE at 8 kts,
Sea-level pressure: 30.42 ins. Hg, falling then more slowly
Visibility: 55 miles, light distant haze, virga distant SE-WSW
6-hr max temp: 59F
6-hr min temp: 53F
6-hr precip: none
BHO SA 1755 10 SCT E24 OVC 55 300/58/51/0508/042/ STFRA SE-SW
BRGHT SPTS IOVC NE VIRGA DSNT SE-WSW LGT DSNT HZ/ 8/72/ 56017
10059 20053

WEATHER SUMMARY FOR WEDNESDAY, SEPTEMBER 24, 2014

TEMPERATURE (DEGREES F)
MAX…..69    NORMAL…..69
MIN…..52    NORMAL…..52
MEAN….61    NORMAL…..60

DEPARTURE FROM 30-YEAR NORMAL…………………….+1
TOTAL DEPARTURE FOR THE MONTH……………………+31 [+1.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..0   DEPARTURE………. -1
TOTAL COOLING UNITS FOR THE MONTH………….92   DEPARTURE……….+37
TOTAL COOLING UNITS FOR THE SEASON………..571   DEPARTURE……….-21
TOTAL COOLING UNITS LAST SEASON TO DATE……696   DIFFERENCE……..-125

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………4  DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH…………..78  DEPARTURE……….+4
TOTAL HEATING UNITS FOR THE SEASON………….80  DEPARTURE………-19
TOTAL HEATING UNITS LAST SEASON TO DATE…….105* DIFFERENCE……..-25*

* error in report for yesterday, 9/24, has been corrected….

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………21 NE  AT  8:12 A.M.
ASOS…………………..22 NE  AT  8:12 A.M.
DAVIS………………….21 NE  AT  8:12 A.M. RMY 21
FASTEST MILE FOR YESTERDAY………………..14 E   AT  4:13 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..15 E   AT  4:13 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….14 E   AT  4:15 P.M.
AVERAGE WIND SPEED AND DIRECTION…………10.9 E
ASOS…………………10.8
DAVIS…………………9.5 ENE (060 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……….0.26  DEPARTURE……….-2.91
ASOS…………..0.23
TOTAL PRECIPITATION FOR THE YEAR……….31.44  DEPARTURE……….-6.75
ASOS………….31.66

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/1  88/69/79/+11/0.00/710/90             16 W   RMY 19
9/2  91/70/81/+13/0.00/495/63             24 S   RMY 27 TSTM
9/3  83/67/75/+8/0.00/681/87              24 NW  RMY 27
9/4  86/61/74/+7/0.00/758/97              20 SW  RMY 22
9/5  89/66/78/+11/0.00/731/94             25 SSW RMY 29
9/6  90/67/79/+12/T/481/62                33 SSW RMY 36 TSTM
9/7  77/62/70/+4/0.03/687/89              26 NW  RMY N/A
9/8  74/57/66/+0/0.00/601/78              25 ENE RMY 25
9/9  71/59/65/-1/0.00/384/50              23 ENE RMY 23
9/10 71/58/65/0/0.00/329/43               20 NE  RMY 20
9/11 78/60/69/+4/0.00/099/13              31 SW  RMY 35
9/12 72/51/62/-3/0.00/735/97              25 NNW RMY 22
9/13 67/50/59/-5/0.17/159/21              23 E   RMY 24
9/14 66/47/57/-7/0.00/685/91              25 NW  RMY 24
9/15 67/43/55/-9/0.00/698/93              17 W   RMY 18
9/16 66/52/59/-4/T/030/04                 16 SW  RMY 16
9/17 72/50/61/-2/0.00/722/97              16 NW  RMY 17
9/18 74/52/63/+1/0.00/578/78              21 N   RMY 23
9/19 56/43/50/-12/0.00/…/..             21 NE  RMY 23
9/20 71/45/58/-4/…./…/..              29 S   RMY 30
9/21 80/61/71/+10/0.06/…/..             26 SSE RMY 27
9/22 72/48/60/-1/0.00/…/..              33 W   RMY 35
9/23 70/44/57/-3/0.00/…/..              20 W   RMY 20
9/24 69/52/61/+1/0.00/…/..              21 NE  RMY 21

9/25 morning low temp: 52F since midnight; normal low now 51F

DAILY RECORDS FOR SEPTEMBER 2014:
None so far.

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

RECORDS FOR SEPTEMBER 25
HIGH 87F IN 1970
LOW 31F IN 1950
PRECIP 2.68 INCHES IN 1961
PEAK GUST 63 MPH SSW IN 1991

RECORDS FOR SEPTEMBER 26
HIGH 91F IN 2007
LOW 36F IN 1905,1922,1978
PRECIP 3.84 INCHES IN 1888
PEAK GUST 54e MPH S IN 1977

TODAY’S REPORT PREPARED BY: Robert Skilling