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The Data originates at the National Weather Service, and is
made available here by the
UAlbany Department of Earth and Atmospheric Sciences
Surface Observations
KHEF 090055Z AUTO 00000KT 10SM CLR M11/M12 A3016 RMK AO1=
KHEF 090155Z AUTO 00000KT 10SM CLR M13/M17 A3017 RMK AO1=
KHEF 090255Z AUTO 00000KT 3SM CLR M13/M15 A3018 RMK AO1 52010=
KHEF 090355Z AUTO 00000KT 5SM CLR M14/M17 A3017 RMK AO1=
KHEF 090455Z AUTO 00000KT 8SM CLR M14/M18 A3019 RMK AO1=
KHEF 090555Z AUTO 00000KT 10SM CLR M13/M16 A3018 RMK AO1 11080 21150 54000=
KHEF 090655Z AUTO 00000KT 10SM CLR M14/M18 A3019 RMK AO1=
KHEF 090755Z AUTO 00000KT 1SM CLR M15/M17 A3019 RMK AO1=
KHEF 090855Z AUTO 00000KT 6SM CLR M14/M16 A3017 RMK AO1 57003=
KHEF 090955Z AUTO 00000KT 5SM CLR M15/M18 A3016 RMK AO1=
KHEF 091055Z AUTO 00000KT 10SM CLR M15/M18 A3015 RMK AO1=
KHEF 091155Z AUTO 15003KT 10SM OVC120 M14/M18 A3015 RMK AO1 11130 21170 57007=
KHEF 091255Z AUTO 00000KT 8SM OVC110 M12/M15 A3014 RMK AO1=
KHEF 091355Z AUTO 00000KT 10SM FEW045 OVC075 M11/M12 A3016 RMK AO1=
KHEF 091455Z AUTO 00000KT 10SM OVC043 M09/M11 A3018 RMK AO1 52010=
KHEF 091555Z AUTO 00000KT 10SM BKN050 OVC060 M07/M09 A3015 RMK AO1=
KHEF 091655Z AUTO 00000KT 10SM SCT035 BKN042 OVC050 M03/M08 A3010 RMK AO1=
KHEF 091755Z AUTO 00000KT 10SM BKN044 OVC070 M02/M09 A3006 RMK AO1 11020 21140
57041=
KHEF 091855Z AUTO 35003KT 10SM SCT070 SCT080 00/M06 A2997 RMK AO1=
KHEF 091955Z AUTO 00000KT 10SM SCT080 OVC090 01/M07 A2996 RMK AO1=
KHEF 092055Z AUTO 00000KT 10SM OVC060 01/M07 A2993 RMK AO1 57044=
KHEF 092155Z AUTO 13005KT 10SM OVC048 01/M07 A2990 RMK AO1=
KHEF 092255Z AUTO 13004KT 1SM BKN008 OVC013 M01/M04 A2990 RMK AO1=
KHEF 092355Z AUTO 11004KT 1 1/4SM OVC013 M02/M04 A2987 RMK AO1 10020 21020
400201170 57020=
KHEF 100055Z AUTO 00000KT 1 3/4SM SCT008 OVC015 M02/M03 A2984 RMK AO1=
Decoded Surface Observations
The weather observed at MANASSAS MUNI, VA (KHEF) at 07:55 PM EST was:
The skies were clear.
Temperature: 12F (-11C) Dewpoint: 10F (-12C) Relative Humidity: 92%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.16 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 08:55 PM EST was:
The skies were clear.
Temperature: 9F (-13C) Dewpoint: 1F (-17C) Relative Humidity: 72%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.17 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 09:55 PM EST was:
The skies were clear.
Temperature: 9F (-13C) Dewpoint: 5F (-15C) Relative Humidity: 85%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.18 inches of mercury.
The prevailing visibility was 3 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 10:55 PM EST was:
The skies were clear.
Temperature: 7F (-14C) Dewpoint: 1F (-17C) Relative Humidity: 78%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.17 inches of mercury.
The prevailing visibility was 5 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 11:55 PM EST was:
The skies were clear.
Temperature: 7F (-14C) Dewpoint: 0F (-18C) Relative Humidity: 72%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.19 inches of mercury.
The prevailing visibility was 8 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 12:55 AM EST was:
The skies were clear.
Temperature: 9F (-13C) Dewpoint: 3F (-16C) Relative Humidity: 78%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.18 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 18F.
The minimum temperature in the past 6 hours was 5F.
The weather observed at MANASSAS MUNI, VA (KHEF) at 01:55 AM EST was:
The skies were clear.
Temperature: 7F (-14C) Dewpoint: 0F (-18C) Relative Humidity: 72%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.19 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 02:55 AM EST was:
The skies were clear.
Temperature: 5F (-15C) Dewpoint: 1F (-17C) Relative Humidity: 85%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.19 inches of mercury.
The prevailing visibility was 1 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 03:55 AM EST was:
The skies were clear.
Temperature: 7F (-14C) Dewpoint: 3F (-16C) Relative Humidity: 85%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.17 inches of mercury.
The prevailing visibility was 6 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 04:55 AM EST was:
The skies were clear.
Temperature: 5F (-15C) Dewpoint: 0F (-18C) Relative Humidity: 78%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.16 inches of mercury.
The prevailing visibility was 5 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 05:55 AM EST was:
The skies were clear.
Temperature: 5F (-15C) Dewpoint: 0F (-18C) Relative Humidity: 78%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.15 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 06:55 AM EST was:
The skies were cloudy.
Temperature: 7F (-14C) Dewpoint: 0F (-18C) Relative Humidity: 72%
Winds from the SE (150 degs) at 3 mph.
Altimeter:30.15 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 9F.
The minimum temperature in the past 6 hours was 1F.
The weather observed at MANASSAS MUNI, VA (KHEF) at 07:55 AM EST was:
The skies were cloudy.
Temperature: 10F (-12C) Dewpoint: 5F (-15C) Relative Humidity: 78%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.14 inches of mercury.
The prevailing visibility was 8 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 08:55 AM EST was:
The skies were cloudy.
Temperature: 12F (-11C) Dewpoint: 10F (-12C) Relative Humidity: 92%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.16 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 09:55 AM EST was:
The skies were cloudy.
Temperature: 16F ( -9C) Dewpoint: 12F (-11C) Relative Humidity: 85%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.18 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 10:55 AM EST was:
The skies were cloudy.
Temperature: 19F ( -7C) Dewpoint: 16F ( -9C) Relative Humidity: 86%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.15 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 11:55 AM EST was:
The skies were cloudy.
Temperature: 27F ( -3C) Dewpoint: 18F ( -8C) Relative Humidity: 68%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.10 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 12:55 PM EST was:
The skies were cloudy.
Temperature: 28F ( -2C) Dewpoint: 16F ( -9C) Relative Humidity: 59%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:30.06 inches of mercury.
The prevailing visibility was 10 miles.
The maximum temperature in the past 6 hours was 28F.
The minimum temperature in the past 6 hours was 7F.
The weather observed at MANASSAS MUNI, VA (KHEF) at 01:55 PM EST was:
The skies were partly cloudy.
Temperature: 32F ( 0C) Dewpoint: 21F ( -6C) Relative Humidity: 64%
Winds from the N (350 degs) at 3 mph.
Altimeter:29.97 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 02:55 PM EST was:
The skies were cloudy.
Temperature: 34F ( 1C) Dewpoint: 19F ( -7C) Relative Humidity: 55%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:29.96 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 03:55 PM EST was:
The skies were cloudy.
Temperature: 34F ( 1C) Dewpoint: 19F ( -7C) Relative Humidity: 55%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:29.93 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 04:55 PM EST was:
The skies were cloudy.
Temperature: 34F ( 1C) Dewpoint: 19F ( -7C) Relative Humidity: 55%
Winds from the SE (130 degs) at 6 mph.
Altimeter:29.90 inches of mercury.
The prevailing visibility was 10 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 05:55 PM EST was:
The skies were cloudy.
Temperature: 30F ( -1C) Dewpoint: 25F ( -4C) Relative Humidity: 80%
Winds from the SE (130 degs) at 5 mph.
Altimeter:29.90 inches of mercury.
The prevailing visibility was 1 miles.
The weather observed at MANASSAS MUNI, VA (KHEF) at 06:55 PM EST was:
The skies were cloudy.
Temperature: 28F ( -2C) Dewpoint: 25F ( -4C) Relative Humidity: 86%
Winds from the ESE(110 degs) at 5 mph.
Altimeter:29.87 inches of mercury.
The prevailing visibility was 1.25 miles.
The maximum temperature in the past 6 hours was 36F.
The minimum temperature in the past 6 hours was 28F.
The maximum temperature in the past 24 hours was 36F.
The minimum temperature in the past 24 hours was 1F.
The weather observed at MANASSAS MUNI, VA (KHEF) at 07:55 PM EST was:
The skies were cloudy.
Temperature: 28F ( -2C) Dewpoint: 27F ( -3C) Relative Humidity: 93%
Winds from the CLM(CLM degs) at 0 mph.
Altimeter:29.84 inches of mercury.
The prevailing visibility was 1.75 miles.
Short Range Forecast
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Zone Forecast
VAZ052-100230-
PRINCE WILLIAM/MANASSAS/MANASSAS PARK-
INCLUDING THE CITIES OF...MANASSAS...MANASSAS PARK
601 PM EST TUE FEB 9 2010
...WINTER STORM WARNING IN EFFECT UNTIL 7 PM EST WEDNESDAY...
.TONIGHT...SNOW. SNOW ACCUMULATION OF 4 TO 6 INCHES. LOWS IN THE
UPPER 20S. EAST WINDS AROUND 5 MPH...BECOMING NORTH WITH GUSTS UP TO
20 MPH AFTER MIDNIGHT. CHANCE OF SNOW NEAR 100 PERCENT.
.WEDNESDAY...SNOW. AREAS OF BLOWING SNOW. SNOW MAY BE HEAVY AT TIMES
IN THE MORNING WITH VISIBILITY ONE QUARTER MILE OR LESS AT TIMES.
TOTAL SNOW ACCUMULATION OF 8 TO 12 INCHES. BLUSTERY WITH HIGHS IN
THE UPPER 20S. NORTHWEST WINDS 15 TO 25 MPH. GUSTS UP TO 35 MPH...
INCREASING TO 45 MPH IN THE AFTERNOON. CHANCE OF SNOW 90 PERCENT.
.WEDNESDAY NIGHT...MOSTLY CLOUDY. A CHANCE OF SNOW IN THE EVENING.
BLUSTERY WITH LOWS IN THE LOWER 20S. NORTHWEST WINDS 15 TO 25 MPH
WITH GUSTS UP TO 40 MPH. CHANCE OF SNOW 30 PERCENT.
.THURSDAY...MOSTLY SUNNY. HIGHS IN THE MID 30S. NORTHWEST WINDS
15 TO 20 MPH WITH GUSTS UP TO 30 MPH.
.THURSDAY NIGHT...PARTLY CLOUDY. LOWS AROUND 19. NORTHWEST WINDS
10 TO 15 MPH.
.FRIDAY...MOSTLY SUNNY. HIGHS IN THE UPPER 30S.
.FRIDAY NIGHT...PARTLY CLOUDY. LOWS AROUND 20.
.SATURDAY...MOSTLY SUNNY. HIGHS IN THE MID 30S.
.SATURDAY NIGHT...PARTLY CLOUDY. LOWS 15 TO 20.
.SUNDAY...MOSTLY SUNNY. HIGHS IN THE LOWER 30S.
.SUNDAY NIGHT...PARTLY CLOUDY. LOWS AROUND 20.
.PRESIDENTS DAY...MOSTLY SUNNY. HIGHS IN THE UPPER 30S.
.MONDAY NIGHT...PARTLY CLOUDY. LOWS AROUND 20.
.TUESDAY...MOSTLY SUNNY. HIGHS IN THE MID 30S.
State Forecast
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State Forecast Discussion
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GFS Short-Range Model Output Statistics (MOS) Forecast
KHEF GFS MOS GUIDANCE 2/09/2010 1800 UTC
DT /FEB 10 /FEB 11 /FEB 12
HR 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 12 18
N/X 22 28 19 38 15
TMP 30 30 30 29 26 22 25 26 27 28 26 24 22 28 36 36 28 23 21 17 33
DPT 21 22 21 19 17 14 14 14 15 15 13 12 12 15 14 13 11 11 10 7 10
CLD OV OV OV OV OV OV OV OV OV BK BK SC BK BK OV BK SC FW FW FW BK
WDR 09 03 02 33 32 31 31 32 32 32 32 32 32 31 31 32 30 30 31 32 31
WSP 01 04 03 05 10 17 17 22 23 20 18 14 10 14 15 14 09 07 06 05 08
P06 100 99 71 57 18 4 4 5 0 0 3
P12 100 78 18 8 0
Q06 3 3 1 1 0 0 0 0 0 0 0
Q12 3 1 0 0 0
T06 1/ 0 0/ 2 0/ 2 0/ 4 0/ 3 0/ 2 0/ 2 0/ 2 0/ 0 0/ 0
T12 2/ 2 1/ 4 0/ 2 0/ 2 0/ 0
POZ 60 61 46 24 10 6 3 1 0 2 7 3 4 3 1 2 1 2 3 1 2
POS 24 20 34 54 77 88 89 91 87 86 91 97 93 90 93 93 85 83 81 83 95
TYP Z Z Z S S S S S S S S S S S S S S S S S S
SNW 2 0
CIG 5 3 2 3 3 4 5 6 6 6 7 8 8 7 6 8 8 8 8 8 8
VIS 4 3 3 4 5 5 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
OBV BR BR BR BR BR N N N N N N N N N N N N N N N N
GFS Long-Range Model Output Statistics (MOS) Forecast
KHEF GFSX MOS GUIDANCE 2/09/2010 1200 UTC
FHR 24 36| 48 60| 72 84| 96 108|120 132|144 156|168 180|192
WED 10| THU 11| FRI 12| SAT 13| SUN 14| MON 15| TUE 16|WED CLIMO
N/X 20 27| 20 39| 15 37| 14 33| 13 37| 15 34| 18 40| 20 26 47
TMP 23 26| 23 29| 17 28| 16 24| 15 29| 17 26| 20 32| 22
DPT 15 15| 14 10| 7 11| 9 11| 10 17| 9 14| 11 17| 15
WND 10 25| 25 15| 10 10| 6 11| 7 6| 5 14| 9 11| 4
P12 100 70| 11 2| 2 3| 10 8| 3 10| 44 26| 2 7| 17999999
P24 100| 11| 3| 10| 10| 44| 7| 999
Q12 3 1| 0 0| 0 0| 0 0| 0 0| 1 0| |
Q24 4| 0| 0| 0| 0| 1| |
T12 2 0| 0 0| 0 0| 0 0| 0 0| 2 1| 1 1| 1
T24 | 4 | 1 | 1 | 1 | 2 | 1 | 1
SNW 2| 0| 9| 9| 9| | |
NGM Model Output Statistics (MOS) Forecast
Climatological Summary
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Watch and Warning Statment
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Park/Ski Recreation Report/Forecast
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