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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

KDAA 151855Z AUTO 20007KT 10SM CLR 37/19 A2986 RMK AO2 SLP114 T03650194 $=
KDAA 151955Z AUTO 17008KT 10SM CLR 37/20 A2983 RMK AO2 SLP103 T03730201 $=
KDAA 152055Z AUTO 17005KT 10SM CLR 36/20 A2982 RMK AO2 SLP100 T03550202 57021 $=
KDAA 152155Z AUTO 23003KT 10SM CLR 35/21 A2984 RMK AO2 LTG DSNT SW SLP107
 T03460205 $=
KDAA 152201Z AUTO 27003KT 10SM -RA FEW070 34/21 A2984 RMK AO2 LTG DSNT SW RAB01
 SLP107 $=
KDAA 152202Z AUTO 27004KT 10SM FEW070 34/21 A2984 RMK AO2 LTG DSNT SW RAB01E02
 SLP107 $=
KDAA 152204Z AUTO 30004KT 10SM -RA FEW070 34/21 A2984 RMK AO2 LTG DSNT SW
 RAB01E02RAB04 SLP107 $=
KDAA 152202Z AUTO 27004KT 10SM FEW070 34/21 A2984 RMK AO2 LTG DSNT SW RAB01E02
 SLP107 $=
KDAA 152204Z AUTO 30004KT 10SM -RA FEW070 34/21 A2984 RMK AO2 LTG DSNT SW
 RAB01E02RAB04 SLP107 $=
KDAA 152218Z AUTO 00000KT 10SM FEW070 FEW160 32/19 A2983 RMK AO2 LTG DSNT SW
 RAB01E02RAB04E18 SLP103 $=
KDAA 152255Z AUTO 30005KT 10SM CLR 32/21 A2982 RMK AO2 RAB01E02RAB04E18 SLP100
 P0000 T03230205 $=
KDAA 152355Z AUTO 00000KT 10SM CLR 32/18 A2980 RMK AO2 SLP093 60000 T03230181
 10374 20317 58004 $=
KDAA 160055Z AUTO 00000KT 10SM CLR 30/18 A2982 RMK AO2 SLP100 T02990183 $=
KDAA 160155Z AUTO 00000KT 10SM CLR 26/20 A2983 RMK AO2 SLP103 T02640200 $=
KDAA 160255Z AUTO 00000KT 10SM FEW100 26/21 A2983 RMK AO2 SLP103 T02580206
 51010 $=
KDAA 160355Z AUTO 00000KT 10SM CLR 25/21 A2981 RMK AO2 SLP097 T02490210 $=
KDAA 160455Z AUTO 00000KT 10SM CLR 24/21 A2981 RMK AO2 SLP097 T02400209
 403740237 $=
KDAA 160555Z AUTO 00000KT 10SM CLR 25/21 A2980 RMK AO2 SLP093 T02490214 10323
 20236 57012 $=
KDAA 160655Z AUTO 00000KT 10SM CLR 24/22 A2980 RMK AO2 SLP093 T02410218 $=
KDAA 160755Z AUTO 00000KT 10SM CLR 23/22 A2982 RMK AO2 SLP100 T02340216 $=
KDAA 160855Z AUTO 00000KT 10SM CLR 23/22 A2982 RMK AO2 SLP100 T02290217 52008 $=
KDAA 160955Z AUTO 00000KT 10SM CLR 23/22 A2983 RMK AO2 SLP103 T02300216 $=
KDAA 161055Z AUTO 00000KT 10SM CLR 24/22 A2984 RMK AO2 SLP107 T02380222 $=
KDAA 161155Z AUTO 00000KT 10SM CLR 28/23 A2986 RMK AO2 SLP114 T02770226 10277
 20223 52012 $=
KDAA 161255Z AUTO 16003KT 10SM CLR 29/23 A2985 RMK AO2 SLP110 T02930225 $=
KDAA 161355Z AUTO 00000KT 10SM CLR 32/23 A2984 RMK AO2 SLP107 T03160226 $=
KDAA 161455Z AUTO 15005KT 10SM CLR 34/23 A2984 RMK AO2 SLP107 T03370234 55006 $=
KDAA 161555Z AUTO 19006KT 10SM CLR 35/23 A2983 RMK AO2 SLP103 T03520231 $=
KDAA 161655Z AUTO 15008KT 10SM CLR 38/20 A2982 RMK AO2 SLP100 T03760204 $=
KDAA 161755Z 18007G17KT 140V260 10SM CLR 38/20 A2978 RMK A02A=
KDAA 161855Z AUTO 18010G15KT 10SM CLR 38/20 A2978 RMK AO2 SLP086 T03800198 $=

Decoded Surface Observations


The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 02:55 PM EDT was:
  The skies were clear.
  Temperature: 98F ( 37C)  Dewpoint:  67F ( 19C)  Relative Humidity:  37%
  Winds from the SSW(200 degs) at  8 mph.
  Pressure: 1011.4 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 03:55 PM EDT was:
  The skies were clear.
  Temperature: 99F ( 37C)  Dewpoint:  68F ( 20C)  Relative Humidity:  37%
  Winds from the S  (170 degs) at  9 mph.
  Pressure: 1010.3 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 04:55 PM EDT was:
  The skies were clear.
  Temperature: 96F ( 36C)  Dewpoint:  68F ( 20C)  Relative Humidity:  41%
  Winds from the S  (170 degs) at  6 mph.
  Pressure: 1010.0 millibars.  Altimeter:29.82 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 05:55 PM EDT was:
  The skies were clear.
  Temperature: 94F ( 35C)  Dewpoint:  69F ( 21C)  Relative Humidity:  44%
  Winds from the SW (230 degs) at  3 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 06:01 PM EDT was:
  The skies were mostly clear.
  The weather reported was light rain.
  Temperature: 93F ( 34C)  Dewpoint:  70F ( 21C)  Relative Humidity:  47%
  Winds from the W  (270 degs) at  3 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 06:02 PM EDT was:
  The skies were mostly clear.
  Temperature: 93F ( 34C)  Dewpoint:  70F ( 21C)  Relative Humidity:  47%
  Winds from the W  (270 degs) at  5 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 06:04 PM EDT was:
  The skies were mostly clear.
  The weather reported was light rain.
  Temperature: 93F ( 34C)  Dewpoint:  70F ( 21C)  Relative Humidity:  47%
  Winds from the NW (300 degs) at  5 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 06:02 PM EDT was:
  The skies were mostly clear.
  Temperature: 93F ( 34C)  Dewpoint:  70F ( 21C)  Relative Humidity:  47%
  Winds from the W  (270 degs) at  5 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 06:04 PM EDT was:
  The skies were mostly clear.
  The weather reported was light rain.
  Temperature: 93F ( 34C)  Dewpoint:  70F ( 21C)  Relative Humidity:  47%
  Winds from the NW (300 degs) at  5 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 06:18 PM EDT was:
  The skies were mostly clear.
  Temperature: 90F ( 32C)  Dewpoint:  66F ( 19C)  Relative Humidity:  46%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.3 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 06:55 PM EDT was:
  The skies were clear.
  Temperature: 90F ( 32C)  Dewpoint:  69F ( 21C)  Relative Humidity:  50%
  Winds from the NW (300 degs) at  6 mph.
  Pressure: 1010.0 millibars.  Altimeter:29.82 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 FORT BELVOIR/DAV, VA (KDAA) at 07:55 PM EDT was:
  The skies were clear.
  Temperature: 90F ( 32C)  Dewpoint:  65F ( 18C)  Relative Humidity:  43%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1009.3 millibars.  Altimeter:29.80 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was  99F.
  The minimum temperature in the past 6 hours was  89F.
  There has been 0.00 inches of precipitation in the past 6 hours.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 08:55 PM EDT was:
  The skies were clear.
  Temperature: 86F ( 30C)  Dewpoint:  65F ( 18C)  Relative Humidity:  50%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.0 millibars.  Altimeter:29.82 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 09:55 PM EDT was:
  The skies were clear.
  Temperature: 80F ( 26C)  Dewpoint:  68F ( 20C)  Relative Humidity:  68%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.3 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 10:55 PM EDT was:
  The skies were mostly clear.
  Temperature: 78F ( 26C)  Dewpoint:  69F ( 21C)  Relative Humidity:  73%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.3 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 11:55 PM EDT was:
  The skies were clear.
  Temperature: 77F ( 25C)  Dewpoint:  70F ( 21C)  Relative Humidity:  79%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1009.7 millibars.  Altimeter:29.81 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 12:55 AM EDT was:
  The skies were clear.
  Temperature: 75F ( 24C)  Dewpoint:  70F ( 21C)  Relative Humidity:  83%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1009.7 millibars.  Altimeter:29.81 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 24 hours was  99F.
  The minimum temperature in the past 24 hours was  75F.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 01:55 AM EDT was:
  The skies were clear.
  Temperature: 77F ( 25C)  Dewpoint:  71F ( 21C)  Relative Humidity:  81%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1009.3 millibars.  Altimeter:29.80 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was  90F.
  The minimum temperature in the past 6 hours was  74F.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 02:55 AM EDT was:
  The skies were clear.
  Temperature: 75F ( 24C)  Dewpoint:  71F ( 22C)  Relative Humidity:  87%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1009.3 millibars.  Altimeter:29.80 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 03:55 AM EDT was:
  The skies were clear.
  Temperature: 74F ( 23C)  Dewpoint:  71F ( 22C)  Relative Humidity:  90%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.0 millibars.  Altimeter:29.82 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 04:55 AM EDT was:
  The skies were clear.
  Temperature: 73F ( 23C)  Dewpoint:  71F ( 22C)  Relative Humidity:  93%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.0 millibars.  Altimeter:29.82 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 05:55 AM EDT was:
  The skies were clear.
  Temperature: 73F ( 23C)  Dewpoint:  71F ( 22C)  Relative Humidity:  92%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.3 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 06:55 AM EDT was:
  The skies were clear.
  Temperature: 75F ( 24C)  Dewpoint:  72F ( 22C)  Relative Humidity:  91%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 07:55 AM EDT was:
  The skies were clear.
  Temperature: 82F ( 28C)  Dewpoint:  73F ( 23C)  Relative Humidity:  74%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1011.4 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was  82F.
  The minimum temperature in the past 6 hours was  72F.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 08:55 AM EDT was:
  The skies were clear.
  Temperature: 85F ( 29C)  Dewpoint:  73F ( 23C)  Relative Humidity:  67%
  Winds from the SSE(160 degs) at  3 mph.
  Pressure: 1011.0 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 09:55 AM EDT was:
  The skies were clear.
  Temperature: 89F ( 32C)  Dewpoint:  73F ( 23C)  Relative Humidity:  59%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 10:55 AM EDT was:
  The skies were clear.
  Temperature: 93F ( 34C)  Dewpoint:  74F ( 23C)  Relative Humidity:  55%
  Winds from the SE (150 degs) at  6 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 11:55 AM EDT was:
  The skies were clear.
  Temperature: 95F ( 35C)  Dewpoint:  74F ( 23C)  Relative Humidity:  50%
  Winds from the S  (190 degs) at  7 mph.
  Pressure: 1010.3 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 12:55 PM EDT was:
  The skies were clear.
  Temperature:100F ( 38C)  Dewpoint:  69F ( 20C)  Relative Humidity:  37%
  Winds from the SE (150 degs) at  9 mph.
  Pressure: 1010.0 millibars.  Altimeter:29.82 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 01:55 PM EDT was:
  The skies were clear.
  Temperature:100F ( 38C)  Dewpoint:  68F ( 20C)  Relative Humidity:  35%
  Winds from the S  (180 degs) at  8 mph.
  Altimeter:29.78 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at FORT BELVOIR/DAV, VA (KDAA) at 02:55 PM EDT was:
  The skies were clear.
  Temperature:100F ( 38C)  Dewpoint:  68F ( 20C)  Relative Humidity:  35%
  Winds from the S  (180 degs) at 12 mph.
  Pressure: 1008.6 millibars.  Altimeter:29.78 inches of mercury.
  The prevailing visibility was 10 miles.

Short Range Forecast

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Zone Forecast

VAZ053-162300-
Fairfax-
Including the cities of Reston, Herndon, Annandale, Centreville,
Chantilly, McLean, and Franconia
344 PM EDT Tue Jul 16 2024

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...
...SEVERE THUNDERSTORM WATCH 548 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...
...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT WEDNESDAY...

.REST OF THIS AFTERNOON...Mostly sunny with scattered showers and
thunderstorms. Some thunderstorms may be severe with damaging
winds. Hot with highs around 101. South winds around 10 mph with
gusts up to 20 mph. Chance of rain 40 percent. Heat index values
up to 109.
.TONIGHT...Mostly cloudy with scattered showers and thunderstorms
in the evening, then partly cloudy after midnight. Some
thunderstorms may be severe with damaging winds. Lows in the mid
70s. Southwest winds 5 to 10 mph. Chance of rain 40 percent.
.WEDNESDAY...Mostly sunny. Showers and scattered thunderstorms in
the afternoon. Hot with highs in the upper 90s. Southwest winds
5 to 10 mph. Chance of rain 80 percent. Heat index values up to
108.
.WEDNESDAY NIGHT...Showers and numerous thunderstorms in the
evening, then numerous showers and scattered thunderstorms after
midnight. Lows in the lower 70s. West winds 5 to 10 mph. Chance
of rain 80 percent.
.THURSDAY...Mostly cloudy in the morning, then becoming partly
sunny. Scattered showers. Highs in the mid 80s. North winds 5 to
10 mph. Chance of rain 40 percent.
.THURSDAY NIGHT...Partly cloudy. Lows in the mid 60s.
.FRIDAY...Mostly sunny. Highs in the mid 80s.
.FRIDAY NIGHT...Mostly cloudy. Lows in the upper 60s.
.SATURDAY...Partly sunny with a chance of showers and
thunderstorms. Highs in the mid 80s. Chance of rain 30 percent.
.SATURDAY NIGHT...Mostly cloudy. Lows around 70.
.SUNDAY...Partly sunny. Highs around 90.
.SUNDAY NIGHT...Mostly cloudy. Lows around 70.
.MONDAY...Partly sunny with a chance of showers and
thunderstorms. Highs in the upper 80s. Chance of rain 50 percent.


State Forecast

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State Forecast Discussion

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GFS Short-Range Model Output Statistics (MOS) Forecast

KDAA   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          96          71          89    67
TMP  99 99 91 81 76 74 80 91 94 90 83 78 74 72 75 82 86 87 79 72 74
DPT  65 66 71 71 71 70 73 72 70 72 74 74 72 71 71 67 65 64 67 64 63
CLD  SC FW BK OV SC SC FW BK BK OV OV OV OV OV OV BK BK BK BK BK FW
WDR  18 19 17 32 31 27 18 18 20 24 30 00 31 32 32 32 31 24 23 32 34
WSP  09 09 01 01 01 01 02 04 08 09 04 00 05 03 03 04 05 04 01 02 03
P06         6    22     8     1    58    63    11    16     6 14 13
P12                    31          66          71          18    15
Q06         0     0     0     0     3     3     0     0     0  0  0
Q12                     0           2           2           0     0
T06     30/30 26/13  3/ 3  3/ 7 47/34 27/13  2/ 3  4/ 3 10/14  2/ 1
T12           43/33        3/ 9       54/36        4/ 6    13/15
CIG   8  8  8  8  8  8  8  8  8  8  6  6  7  7  7  7  8  8  8  8  8
VIS   7  7  7  7  7  7  7  7  7  7  7  6  6  7  7  7  7  7  7  7  7
OBV   N  N  N  N  N  N  N  N  N  N  N  N BR  N  N  N  N  N  N  N  N

GFS Long-Range Model Output Statistics (MOS) Forecast

KDAA   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  96| 71  89| 67  87| 68  91| 69  90| 70  91| 68  91| 69 67 88
TMP  80  83| 75  79| 74  79| 75  82| 75  81| 76  81| 74  82| 73
DPT  73  74| 71  67| 63  65| 68  70| 71  72| 71  71| 69  72| 69
CLD  PC  OV| OV  OV| PC  PC| PC  PC| OV  OV| OV  OV| OV  PC| PC
WND   2   9|  5   5|  3   4|  2   5|  1   4|  1   5|  2   5|  2
P12  31  66| 71  18| 15   6| 12  16| 19  27| 24  23| 29  27| 28999999
P24      70|     71|     17|     16|     39|     35|     48|       31
Q12   0   2|  2   0|  0   0|  0   0|  0   0|  0   0|       |
Q24       2|      2|      0|      0|      0|      0|       |
T12  26  47| 27  11| 10   8|  5  17| 14  28| 19  28| 21  28| 16
T24        | 47    | 11    |  8    | 18    | 34    | 37    | 33

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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