Thursday, February 20, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, FEBRUARY 20, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

RISING TEMPERATURES UNDER A STRENGTHENING SUN
BEGIN THE THAW TODAY FOLLOWING YESTERDAY’S
MIXED PRECIPITATION.

Yesterday afternoon we observed another familiar sight- more frozen
precipitation! Beginning just after the 1:00 PM observation light
snow began to fall, followed by a transition to ice pellets and
finally freezing rain. In total we received 0.1 inches of frozen
precipitation with a total liquid equivalent including the freezing
rain of 0.25 inches. The glaze ice that formed on most surfaces
also measured 0.25 inches.

Today, Thursday, began with nearly cloudless skies and temperatures
hovering just under the freezing mark at 31.5F. With a stronger
mid-February sun and a shift in the winds to WSW temperatures were
able to climb to 38.2F. At 1:00 PM the climb continued to 46.1F.

Today’s Observations:

7 A.M.
Weather: Clear, few cirrus WSW
Temperature: 32F; Dew Point: 31F; Wind: W at 13 kts,
Sea-level pressure: 30.13 ins. Hg, increasing, then more slowly
Visibility: 20 miles, thin fog all quadrants
6-hr min temp: 32F
6-hr max temp: 30F
24-hr precip: 0.25 in.
24-hr snowfall: 0.1 ins.
24-hr glaze ice accumulation: 0.25 ins.
Snow depth: 19 inches
BHO SA 1155 CLR 20 203/32/31/2613/013/ FEW CI WSW THN F ALQDS
TOTAL GLZ PST 24 HRS 0.25 IN NEW SNW PST 24 HRS 0.1/
8/001 4/019 51046 ASOS 70025 MANUAL 70025 10032 20030

10 A.M.
Weather: Clear, few cirrus in all quadrants, few cirrocumulus NW
Temperature: 38F Dew Point: 29F; Wind: W at 7 kts
Sea-level pressure: 30.19 ins. Hg, increasing, then steady
Visibility: 30 miles, thin smoke along the horizon SW-NE,
40 miles ENE-SSW
BHO SA 1455 CLR 30 225/38/29/27/2707/019/ FEW CI DSNT ALQDS
FEW CC NW K LYR ALG HRZN SW-NE VSBY ENE-SSW 50 MI/ 8/001 51022

1 P.M.
Weather: Clear, few altostratus lenticularis distant W-NE,
few cirrostratus in all quadrants, and increasing
Temperature: 46F; Dew Point: 21F; Wind: WSW at 9 kts
Sea-level pressure: 30.18 Hg, steady, then falling
Visibility: 40 miles
6-hr max. temp: 47F
6-hr min. temp: 32F
BHO SA 1755 CLR 40 220/46/21/2409/018/ FEW ACSL DSNT W-NE
FEW CS DSNT ALQDS K LYR ALG NNE-ENE/ 8/045 58005 10047 20032

WEATHER SUMMARY FOR WEDNESDAY, FEBRUARY 19, 2014

TEMPERATURE (DEGREES F)
MAX…..35    NORMAL…..37
MIN…..20    NORMAL…..20
MEAN….28    NORMAL…..29

DEPARTURE FROM 30-YEAR NORMAL…………………….-1
TOTAL DEPARTURE FOR THE MONTH……………………-37 [-2.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..37 DEPARTURE……….+1
TOTAL HEATING UNITS FOR THE MONTH………….756 DEPARTURE……….35
TOTAL HEATING UNITS FOR THE SEASON………..4273 DEPARTURE………+22
TOTAL HEATING UNITS LAST SEASON TO DATE……3838 DIFFERENCE…….+435

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………21 W     AT     1:01 A.M. *
AERO…………………..20 ESE   AT    11:02 A.M.
ASOS…………………..24 NW    AT     7:57 P.M.
DAVIS………………….21 SSE   AT    11:03 A.M. RMY 26
FASTEST MILE FOR YESTERDAY………………..16 W     AT    12:30 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..17 ENE   AT     3:41 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….16 SE    AT    11:05 A.M.
AVERAGE WIND SPEED AND DIRECTION………… 10.0 W
ASOS………………….10.4
DAVIS…………………7.6 W [280 deg.] * last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.25 DEPARTURE………….+0.10
ASOS…………..0.25
TOTAL PRECIPITATION FOR THE MONTH……….5.04 DEPARTURE………….+2.38
ASOS…………..5.19
TOTAL PRECIPITATION FOR THE YEAR………..9.66 DEPARTURE………….+2.65
ASOS…………..10.10

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.1 DEPARTURE…………..-0.4
TOTAL SNOWFALL FOR THE MONTH……………32.0 DEPARTURE………….+22.6
TOTAL SNOWFALL FOR THE SEASON…………..80.8 DEPARTURE………….+38.3

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 2014 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY: RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized

2/1 45/30/38/+12/0.00/0.0/402/67         24 S   AERO 23 MPH S   RMY 25
2/2 53/33/43/+17/0.00/0.0/181/30         22 S   AERO 21 MPH WNW RMY 21
2/3 36/22/29/+3/0.32/2.8/000/00          22 NNE AERO 18 MPH NNE RMY 21
2/4 33/18/26/0/0.00/0.0/377/62           20 NW AERO 16 MPH NW RMY 17
2/5 31/21/26/0/1.32/10.7/000/00          32 ENE AERO 30 MPH ENE RMY 30
2/6 26/15/21/-5/0.02/0.4/398/65          22 WNW AERO 21 MPH WNW RMY 22
2/7 29/13/21/-6/0.00/0.0/615/100         25 W   AERO 23 MPH W   RMY 27
2/8 28/12/20/-7/0.00/0.0/612/99          24 W   AERO 23 MPH W   RMY 23
2/9 28/19/24/-3/0.05/1.0/112/18          21 N   AERO 17 MPH N   RMY 19
2/10 27/14/21/-6/0.00/0.0/617/99          28 NW AERO 28 MPH NW RMY 30
2/11 24/8/16/-11/0.00/0.0/625/100         22 WNW AERO 20 MPH WNW RMY 25
2/12 25/2/14/-13/0.00/0.0/…/..          25 NNW AERO 23 MPH NW RMY 21
2/13 33/19/26/-2/…./…/000/00          46 NE AERO 51 MPH NE RMY 51
2/14 34/27/31/+3/…./…/…/..          48 W   AERO 51 MPH WNW RMY 49
2/15 34/27/31/+3/…./…/…/..          35 NW AERO 35 MPH NW RMY 48
2/16 30/18/24/-4/…./…/…/..          45 NW AERO 46 MPH NW RMY N/A
2/17 27/9/18/-10/0.00/0.0/…/..          38 NW AERO 38 MPH NW RMY 41
2/18 32/12/22/-7/0.32/4.0/…/..          27 ESE AERO 25 MPH WNW RMY 28
2/19 35/20/28/-1/0.25/0.1/…/..          21 W   AERO 20 MPH ESE RMY 26