Thursday, July 23, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JULY 23, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

SPRINKLES OVERNIGHT BRING ONLY INTERRUPTION TO
CLEAR SKIES AND SEASONAL TEMPERATURES

Seasonal temperatures in the low 80s and overnight
low in the low 60s have characterized the past few
days with only a couple brief showers. Yesterday’s
maximum temperature of 82F was just one degree
above the daily normal temperature, while this morning’s
overnight low of 62F was just one degree below the
daily normal minimum.

A trace of rain overnight added to our annual deficit
of precipitation, which now stands at 2.43 inches
below normal. July so far stands at 0.27 inches above
normal.

Clear skies this morning have given way to partly cloudy
skies with some growing, but small cumulus by the 1:00
PM EST observation. A maximum temperature of 80F
had been recorded by this time as well.
Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus distant WNW-E,
few cirrostratus distant SE-S
Temperature: 68F; Dew Point: 57F; Wind: estimated W at 6 kts
Wind Speed: Light
Sea-level pressure: 29.88 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 68F
6-hr Min temp: 62F
24-hr precip: Trace
BHO SA 1155 CLR 70 119/68/57/E2806/988/ FEW AC DSNT WNW-E
FEW CS DSNT SE-S WND LGT/ 8/038 53013 10068 20062

10 A.M.
Weather: Scattered cumulus
Temperature: 75F; Dew Point 56F; Wind: WNW at 9G16 kts
Sea-level pressure: 29.87 ins. Hg, rising, then falling and lower
Visibility: 80 miles
BHO SA 1455 39 SCT 80 116/75/56/2909G16/987/ 8/100 58003

1 P.M.
Weather: Scattered cumulus
Temperature: 79F; Dew Point: 55F; Wind: WNW at 9 kts,
Sea-level pressure: 29.86 ins. Hg, falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 80F
6-hr Min temp: 68F
BHO SA 1755 50 SCT 80 111/79/55/3009/986/ 8/100 56005 10080 20068
SUMMARY FOR WEDNESDAY, JULY 21, 2015

TEMPERATURE (DEGREES F)
MAX…..82   NORMAL…..81
MIN…..64   NORMAL…..63
MEAN….73   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………+1
TOTAL DEPARTURE FOR THE MONTH…………………..+24 [+0.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………8   DEPARTURE……….+0
TOTAL COOLING UNITS FOR THE MONTH………….169   DEPARTURE………+16
TOTAL COOLING UNITS FOR THE SEASON…………307   DEPARTURE………+25
TOTAL COOLING UNITS LAST SEASON TO DATE…….282   DIFFERENCE……..+25

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….24  WNW AT  4:07 P.M.
ASOS……………………26  NW  AT  4:08 P.M.
DAVIS…………………..25  WNW AT  4:07 P.M. RMY 26
FASTEST MILE FOR YESTERDAY…………………18  WNW AT  4:19 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………18  WNW AT  4:21 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16  WNW AT  4:08 P.M.
AVERAGE WIND SPEED AND DIRECTION……………10.7 NW
ASOS……………………10.1
DAVIS…………………..8.9 NW  [307 deg.] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….TRACE  DEPARTURE…..-0.13
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..2.99  DEPARTURE…..+0.27
ASOS……………3.01
TOTAL PRECIPITATION FOR THE YEAR………..27.26  DEPARTURE…..-2.43
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
PRELIMINARY CLIMATE SUMMARY FOR JULY 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

7/1  80/63/72/+2/0.59/466/51               30 SSE RMY 33  TSTM
7/2  78/60/69/-1/0.00/721/79               23 WNW RMY N/A
7/3  79/58/69/-2/0.00/867/95               17 SSW RMY 17
7/4  74/61/68/-3/T/109/12                  16 S   RMY N/A
7/5  82/58/70/-1/0.00/865/95               20 WSW RMY 20
7/6  85/64/75/+4/0.00/755/83               20 S   RMY 21
7/7  84/65/75/+4/0.02/445/49               35 S   RMY 40
7/8  87/68/78/+6/T/372/41                  23 NE  RMY N/A
7/9  73/61/67/-5/…./390/43               24 NE  RMY 25
7/10 80/59/70/-2/…./535/59               18 W   RMY N/A TSTM
7/11 84/61/73/+1/0.00/868/96               21 NW  RMY 19
7/12 88/67/78/+6/0.00/813/90               20 W   RMY 17
7/13 82/66/74/+2/0.00/424/47               21 E   RMY 20
7/14 81/64/73/+1/…./396/44               25 S   RMY 27
7/15 84/61/73/+1/…./…/..               24 ENE RMY 26
7/16 72/56/64/-8/0.00/…/..               25 NNE RMY 24
7/17 79/56/68/-4/0.00/…/..               21 S   RMY N/A
7/18 76/63/70/-2/0.16/…/..               29 SSW RMY 30  TSTM
7/19 89/68/79/+7/0.01/…/..               25 SSW RMY 27
7/20 90/73/82/+10/0.00/…/..              24 W   RMY 26
7/21 87/70/79/+7/T/…/..                  24 W   RMY 25
7/22 82/64/73/+1/T/…/..                  24 WNW RMY 26

7/23 low since midnight is 62F; normal low is now 63F

DAILY RECORDS FOR JULY 2015

7/10- NEW RECORD DAILY PRECIPITATION PENDING OF X.XX in 2015
surpasses previous record of 1.68 in. in 1933

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

RECORDS FOR JULY 23
HIGH 99F IN 1952
LOW 51F IN 1923,1977
PRECIP 1.82 INS IN 1953
PEAK GUST 54e MPH S IN 1946

RECORDS FOR JULY 24
HIGH 96F IN 1987
LOW 49F IN 1893,1912
PRECIP 2.27 INS IN 2008
PEAK GUST 46 MPH NE IN 2009

TODAY’S REPORT PREPARED BY: Brian Fitzgerald