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The Data originates at the National Weather Service, and is made available here by the UAlbany Department of Atmospheric and Environmental Sciences

Surface Observations

KHEF 151956Z 21007G15KT 180V240 10SM CLR 35/21 A2987 RMK AO2 SLP117 T03500211=
KHEF 152056Z 21006KT 10SM CLR 33/22 A2985 RMK AO2 LTG DSNT ALQDS SLP113
 T03330217 56022=
KHEF 152156Z 23008G16KT 10SM FEW110 29/21 A2988 RMK AO2 LTG DSNT NE AND S AND
 SW RAB19E41 SLP120 P0000 T02890206=
KHEF 152256Z VRB03KT 10SM CLR 28/20 A2986 RMK AO2 SLP114 T02830200=
KHEF 152356Z 27003KT 10SM CLR 27/21 A2985 RMK AO2 SLP112 60000 T02720206 10361
 20272 58001=
KHEF 160056Z 26003KT 10SM CLR 27/21 A2987 RMK AO2 SLP119 T02670211=
KHEF 160156Z 00000KT 8SM CLR 25/22 A2988 RMK AO2 SLP122 T02500217=
KHEF 160256Z AUTO 15004KT 10SM CLR 23/22 A2987 RMK AO2 SLP117 T02330217 50006=
KHEF 160356Z AUTO 00000KT 10SM CLR 24/22 A2985 RMK AO2 SLP111 T02390217
 403610228=
KHEF 160456Z AUTO 00000KT 10SM CLR 23/22 A2984 RMK AO2 SLP109 T02330217=
KHEF 160556Z AUTO 19003KT 10SM CLR 22/22 A2984 RMK AO2 SLP108 T02170217 10272
 20217 56009=
KHEF 160656Z AUTO 14003KT 10SM CLR 22/21 A2984 RMK AO2 SLP108 T02170211=
KHEF 160756Z AUTO 16005KT 10SM CLR 22/21 A2985 RMK AO2 SLP112 T02170211=
KHEF 160856Z AUTO 00000KT 10SM CLR 23/22 A2986 RMK AO2 SLP116 T02280217 53007=
KHEF 160956Z AUTO 00000KT 10SM CLR 22/22 A2986 RMK AO2 SLP115 T02220217=
KHEF 161056Z 00000KT 10SM CLR 23/22 A2988 RMK AO2 SLP120 T02330222=
KHEF 161156Z 00000KT 10SM CLR 25/23 A2989 RMK AO2 SLP126 T02500228 10250 20217
 53011=
KHEF 161256Z 20004KT 10SM CLR 28/23 A2988 RMK AO2 SLP123 T02830228=
KHEF 161356Z VRB06KT 10SM CLR 31/23 A2988 RMK AO2 SLP121 T03110233=
KHEF 161456Z 19007KT 10SM CLR 33/24 A2987 RMK AO2 SLP118 T03330244 56008=
KHEF 161556Z 23009KT 10SM CLR 34/23 A2987 RMK AO2 SLP117 T03440228=
KHEF 161656Z 17008KT 10SM CLR 36/23 A2985 RMK AO2 SLP112 T03560228=
KHEF 161756Z 23006G15KT 10SM CLR 36/23 A2983 RMK AO2 SLP103 T03610228 10361
 20256 58014=
KHEF 161856Z 20010G16KT 10SM CLR 37/23 A2981 RMK AO2 SLP097 T03670233=
KHEF 161956Z 18011G16KT 10SM CLR 37/23 A2979 RMK AO2 SLP090 T03670228=

Decoded Surface Observations


The weather observed at MANASSAS MUNI, VA (KHEF) at 03:56 PM EDT was:
  The skies were clear.
  Temperature: 95F ( 35C)  Dewpoint:  70F ( 21C)  Relative Humidity:  44%
  Winds from the SW (210 degs) at  8 mph.
  Pressure: 1011.7 millibars.  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 04:56 PM EDT was:
  The skies were clear.
  Temperature: 92F ( 33C)  Dewpoint:  71F ( 22C)  Relative Humidity:  51%
  Winds from the SW (210 degs) at  7 mph.
  Pressure: 1011.3 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 05:56 PM EDT was:
  The skies were mostly clear.
  Temperature: 84F ( 29C)  Dewpoint:  70F ( 21C)  Relative Humidity:  62%
  Winds from the SW (230 degs) at  9 mph.
  Pressure: 1012.0 millibars.  Altimeter:29.88 inches of mercury.
  The prevailing visibility was 10 miles.
  There has been 0.00 inches of precipitation in the past hour.

The weather observed at MANASSAS MUNI, VA (KHEF) at 06:56 PM EDT was:
  The skies were clear.
  Temperature: 82F ( 28C)  Dewpoint:  68F ( 20C)  Relative Humidity:  62%
  Winds from the VRB(VRB degs) at  3 mph.
  Pressure: 1011.4 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 07:56 PM EDT was:
  The skies were clear.
  Temperature: 81F ( 27C)  Dewpoint:  69F ( 21C)  Relative Humidity:  67%
  Winds from the W  (270 degs) at  3 mph.
  Pressure: 1011.2 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was  97F.
  The minimum temperature in the past 6 hours was  81F.
  There has been 0.00 inches of precipitation in the past 6 hours.

The weather observed at MANASSAS MUNI, VA (KHEF) at 08:56 PM EDT was:
  The skies were clear.
  Temperature: 81F ( 27C)  Dewpoint:  70F ( 21C)  Relative Humidity:  70%
  Winds from the W  (260 degs) at  3 mph.
  Pressure: 1011.9 millibars.  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 09:56 PM EDT was:
  The skies were clear.
  Temperature: 77F ( 25C)  Dewpoint:  72F ( 22C)  Relative Humidity:  83%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1012.2 millibars.  Altimeter:29.88 inches of mercury.
  The prevailing visibility was 8 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 10:56 PM EDT was:
  The skies were clear.
  Temperature: 74F ( 23C)  Dewpoint:  71F ( 22C)  Relative Humidity:  91%
  Winds from the SE (150 degs) at  5 mph.
  Pressure: 1011.7 millibars.  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 11:56 PM EDT was:
  The skies were clear.
  Temperature: 75F ( 24C)  Dewpoint:  71F ( 22C)  Relative Humidity:  88%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1011.1 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 12:56 AM EDT was:
  The skies were clear.
  Temperature: 73F ( 23C)  Dewpoint:  72F ( 22C)  Relative Humidity:  94%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.9 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 01:56 AM EDT was:
  The skies were clear.
  Temperature: 71F ( 22C)  Dewpoint:  71F ( 22C)  Relative Humidity: 100%
  Winds from the S  (190 degs) at  3 mph.
  Pressure: 1010.8 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was  81F.
  The minimum temperature in the past 6 hours was  71F.

The weather observed at MANASSAS MUNI, VA (KHEF) at 02:56 AM EDT was:
  The skies were clear.
  Temperature: 72F ( 22C)  Dewpoint:  70F ( 21C)  Relative Humidity:  94%
  Winds from the SE (140 degs) at  3 mph.
  Pressure: 1010.8 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 03:56 AM EDT was:
  The skies were clear.
  Temperature: 72F ( 22C)  Dewpoint:  70F ( 21C)  Relative Humidity:  94%
  Winds from the SSE(160 degs) at  6 mph.
  Pressure: 1011.2 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 04:56 AM EDT was:
  The skies were clear.
  Temperature: 73F ( 23C)  Dewpoint:  71F ( 22C)  Relative Humidity:  94%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1011.6 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 05:56 AM EDT was:
  The skies were clear.
  Temperature: 72F ( 22C)  Dewpoint:  72F ( 22C)  Relative Humidity: 100%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1011.5 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 06:56 AM EDT was:
  The skies were clear.
  Temperature: 73F ( 23C)  Dewpoint:  72F ( 22C)  Relative Humidity:  94%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1012.0 millibars.  Altimeter:29.88 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 07:56 AM EDT was:
  The skies were clear.
  Temperature: 77F ( 25C)  Dewpoint:  73F ( 23C)  Relative Humidity:  88%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1012.6 millibars.  Altimeter:29.89 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was  77F.
  The minimum temperature in the past 6 hours was  71F.

The weather observed at MANASSAS MUNI, VA (KHEF) at 08:56 AM EDT was:
  The skies were clear.
  Temperature: 82F ( 28C)  Dewpoint:  73F ( 23C)  Relative Humidity:  74%
  Winds from the SSW(200 degs) at  5 mph.
  Pressure: 1012.3 millibars.  Altimeter:29.88 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 09:56 AM EDT was:
  The skies were clear.
  Temperature: 88F ( 31C)  Dewpoint:  73F ( 23C)  Relative Humidity:  62%
  Winds from the VRB(VRB degs) at  7 mph.
  Pressure: 1012.1 millibars.  Altimeter:29.88 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 10:56 AM EDT was:
  The skies were clear.
  Temperature: 92F ( 33C)  Dewpoint:  76F ( 24C)  Relative Humidity:  60%
  Winds from the S  (190 degs) at  8 mph.
  Pressure: 1011.8 millibars.  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 11:56 AM EDT was:
  The skies were clear.
  Temperature: 93F ( 34C)  Dewpoint:  73F ( 23C)  Relative Humidity:  53%
  Winds from the SW (230 degs) at 10 mph.
  Pressure: 1011.7 millibars.  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 12:56 PM EDT was:
  The skies were clear.
  Temperature: 97F ( 36C)  Dewpoint:  73F ( 23C)  Relative Humidity:  47%
  Winds from the S  (170 degs) at  9 mph.
  Pressure: 1011.2 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 01:56 PM EDT was:
  The skies were clear.
  Temperature: 97F ( 36C)  Dewpoint:  73F ( 23C)  Relative Humidity:  46%
  Winds from the SW (230 degs) at  7 mph.
  Pressure: 1010.3 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was  97F.
  The minimum temperature in the past 6 hours was  78F.

The weather observed at MANASSAS MUNI, VA (KHEF) at 02:56 PM EDT was:
  The skies were clear.
  Temperature: 99F ( 37C)  Dewpoint:  73F ( 23C)  Relative Humidity:  45%
  Winds from the SSW(200 degs) at 12 mph.
  Pressure: 1009.7 millibars.  Altimeter:29.81 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at MANASSAS MUNI, VA (KHEF) at 03:56 PM EDT was:
  The skies were clear.
  Temperature: 99F ( 37C)  Dewpoint:  73F ( 23C)  Relative Humidity:  45%
  Winds from the S  (180 degs) at 13 mph.
  Pressure: 1009.0 millibars.  Altimeter:29.79 inches of mercury.
  The prevailing visibility was 10 miles.

Short Range Forecast

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Zone Forecast

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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    7/16/2024  1200 UTC
DT /JULY 16/JULY 17                /JULY 18                /JULY 19
HR   18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 06 12
N/X                    72          95          71          88    63
TMP  99 99 90 81 76 73 81 91 93 91 84 77 74 72 73 81 86 85 79 68 70
DPT  67 68 71 72 71 70 72 72 71 71 74 74 71 69 69 68 66 65 66 64 62
CLD  SC SC BK OV SC SC SC BK BK OV OV OV OV OV OV BK BK BK BK BK SC
WDR  21 22 30 03 33 22 19 21 22 23 31 17 32 33 35 34 35 33 36 34 36
WSP  10 11 04 04 01 01 02 06 09 10 06 03 05 03 05 07 07 06 03 03 07
P06         6    21     7     1    60    55    10    15     7 14 11
P12                    30          69          62          20    14
Q06         0     0     0     0     4     2     0     0     0  0  0
Q12                     0           3           2           0     0
T06     30/27 25/11  3/ 1  3/ 6 48/34 23/10  1/ 2  4/ 3 12/16  2/ 0
T12           42/36        4/ 8       50/35        5/ 5    14/18
CIG   8  8  8  8  8  8  8  8  8  8  6  6  7  7  7  7  7  8  8  8  8
VIS   7  7  7  7  7  7  7  7  7  7  7  6  6  5  7  7  7  7  7  7  7
OBV   N  N  N  N  N  N  N  N  N  N  N  N  N BR  N  N  N  N  N  N  N

GFS Long-Range Model Output Statistics (MOS) Forecast

KHEF   GFSX MOS GUIDANCE   7/16/2024  1200 UTC
FHR  24  36| 48  60| 72  84| 96 108|120 132|144 156|168 180|192
     WED 17| THU 18| FRI 19| SAT 20| SUN 21| MON 22| TUE 23|WED CLIMO
N/X  72  95| 71  88| 63  88| 67  90| 68  90| 67  91| 69  89| 69 66 88
TMP  81  84| 73  79| 70  81| 74  81| 73  81| 73  81| 74  80| 74
DPT  72  74| 69  66| 62  64| 68  68| 69  70| 69  70| 70  71| 69
CLD  PC  OV| OV  OV| PC  PC| PC  OV| OV  OV| OV  OV| OV  OV| OV
WND   4  10|  6   7|  7   7|  4   7|  4   6|  3   6|  3   7|  5
P12  30  69| 62  20| 14   6| 12  17| 19  26| 22  22| 28  29| 28999999
P24      74|     65|     15|     17|     39|     34|     48|      999
Q12   0   3|  2   0|  0   0|  0   0|  0   0|  0   0|       |
Q24       2|      1|      0|      0|      0|      0|       |
T12  25  48| 23  14|  9  11|  6  19| 14  28| 17  28| 20  30| 15
T24        | 48    | 14    | 11    | 21    | 31    | 37    | 32

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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