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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

KIAD 151952Z 20010G19KT 10SM FEW050 SCT080 37/20 A2986 RMK AO2 SLP107 T03670200=
KIAD 152052Z 21012KT 10SM BKN050CB BKN080 35/19 A2985 RMK AO2 LTG DSNT ALQDS
 SLP103 CB ALQDS MOV E T03500189 56019=
KIAD 152059Z 22007KT 10SM TS BKN050CB BKN090 34/19 A2986 RMK AO2 TSB59 OCNL
 LTGICCG N TS N MOV E T03440194=
KIAD 152121Z 04020G30KT 10SM BKN050CB BKN090 28/19 A2987 RMK AO2 PK WND
 03030/2120 WSHFT 2104 TSB2059E21 TS MOV E CB NE AND SW MOV E T02830189=
KIAD 152152Z 10010KT 10SM BKN050CB BKN120 28/18 A2986 RMK AO2 PK WND 03030/2120
 WSHFT 2104 TSB2059E21 SLP109 TS MOV E CB NE AND SW MOV E T02830178=
KIAD 152252Z 15007KT 10SM SCT060 BKN150 31/19 A2984 RMK AO2 PRESFR SLP101
 T03060194=
KIAD 152352Z 20009KT 10SM CLR 29/19 A2984 RMK AO2 SLP101 T02940189 10372 20272
 58002=
KIAD 152352Z COR 20009KT 10SM SCT070 SCT150 29/19 A2984 RMK AO2 SLP101
 T02940189 10372 20272 58002=
KIAD 160052Z 19005KT 10SM CLR 27/19 A2986 RMK AO2 SLP108 T02720189=
KIAD 160052Z COR 19005KT 10SM SCT060 SCT150 27/19 A2986 RMK AO2 SLP108
 T02720189=
KIAD 160152Z 18005KT 10SM FEW070 SCT150 27/19 A2987 RMK AO2 SLP110 T02670194=
KIAD 160252Z 19006KT 10SM CLR 27/20 A2986 RMK AO2 SLP107 T02670200 50006=
KIAD 160352Z 19005KT 10SM CLR 26/20 A2984 RMK AO2 SLP101 T02610200=
KIAD 160452Z 19007KT 10SM CLR 26/21 A2984 RMK AO2 SLP099 T02610206 403720239=
KIAD 160552Z 00000KT 10SM CLR 26/21 A2983 RMK AO2 SLP098 T02560206 10294 20256
 56009=
KIAD 160652Z 20005KT 10SM CLR 25/21 A2983 RMK AO2 SLP099 T02500206=
KIAD 160752Z 00000KT 10SM CLR 23/21 A2984 RMK AO2 SLP101 T02280206=
KIAD 160852Z 00000KT 10SM CLR 23/21 A2985 RMK AO2 SLP105 T02330206 53007=
KIAD 160952Z 15005KT 10SM CLR 23/21 A2985 RMK AO2 SLP105 T02330211=
KIAD 161052Z 19004KT 10SM FEW100 FEW250 25/22 A2987 RMK AO2 SLP112 T02500217=
KIAD 161152Z 19004KT 10SM FEW150 FEW250 26/22 A2989 RMK AO2 SLP116 T02610217
 10261 20228 53011=
KIAD 161252Z 19006KT 10SM FEW150 FEW250 29/22 A2988 RMK AO2 SLP113 T02940217=
KIAD 161352Z 20008KT 10SM FEW250 32/22 A2987 RMK AO2 SLP109 T03220222=
KIAD 161452Z 19010KT 10SM FEW250 34/22 A2986 RMK AO2 SLP108 T03440217 56008=
KIAD 161552Z 19011KT 10SM FEW250 36/21 A2986 RMK AO2 SLP108 T03560211=
KIAD 161652Z 19008G20KT 10SM FEW060 FEW250 36/21 A2984 RMK AO2 SLP101 T03610211=
KIAD 161752Z 21011G24KT 10SM FEW070 FEW250 37/21 A2982 RMK AO2 SLP095 T03720206
 10372 20261 58013=
KIAD 161852Z 23007G19KT 10SM FEW070 FEW150 38/20 A2980 RMK AO2 SLP088 T03780200=
KIAD 161952Z 21009G19KT 10SM FEW070 SCT150 38/21 A2978 RMK AO2 SLP080 T03780211=

Decoded Surface Observations


The weather observed at WASHINGTON DC, VA (KIAD) at 03:52 PM EDT was:
  The skies were partly cloudy.
  Temperature: 99F ( 37C)  Dewpoint:  68F ( 20C)  Relative Humidity:  37%
  Winds from the SSW(200 degs) at 12 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 04:52 PM EDT was:
  The skies were mostly cloudy.
  Temperature: 95F ( 35C)  Dewpoint:  66F ( 19C)  Relative Humidity:  39%
  Winds from the SW (210 degs) at 14 mph.
  Pressure: 1010.3 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 04:59 PM EDT was:
  The skies were mostly cloudy.
  The weather reported was a thunderstorm.
  Temperature: 93F ( 34C)  Dewpoint:  66F ( 19C)  Relative Humidity:  41%
  Winds from the SW (220 degs) at  8 mph.
  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 05:21 PM EDT was:
  The skies were mostly cloudy.
  Temperature: 82F ( 28C)  Dewpoint:  66F ( 19C)  Relative Humidity:  58%
  Winds from the NE (040 degs) at 23 mph.
  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 05:52 PM EDT was:
  The skies were mostly cloudy.
  Temperature: 82F ( 28C)  Dewpoint:  64F ( 18C)  Relative Humidity:  55%
  Winds from the E  (100 degs) at 12 mph.
  Pressure: 1010.9 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 06:52 PM EDT was:
  The skies were mostly cloudy.
  Temperature: 88F ( 31C)  Dewpoint:  66F ( 19C)  Relative Humidity:  49%
  Winds from the SE (150 degs) at  8 mph.
  Pressure: 1010.1 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 07:52 PM EDT was:
  The skies were clear.
  Temperature: 85F ( 29C)  Dewpoint:  66F ( 19C)  Relative Humidity:  53%
  Winds from the SSW(200 degs) at 10 mph.
  Pressure: 1010.1 millibars.  Altimeter:29.84 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  81F.

The weather observed at WASHINGTON DC, VA (KIAD) at 07:52 PM EDT was:
  The skies were partly cloudy.
  Temperature: 85F ( 29C)  Dewpoint:  66F ( 19C)  Relative Humidity:  53%
  Winds from the SSW(200 degs) at 10 mph.
  Pressure: 1010.1 millibars.  Altimeter:29.84 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  81F.

The weather observed at WASHINGTON DC, VA (KIAD) at 08:52 PM EDT was:
  The skies were clear.
  Temperature: 81F ( 27C)  Dewpoint:  66F ( 19C)  Relative Humidity:  62%
  Winds from the S  (190 degs) at  6 mph.
  Pressure: 1010.8 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 08:52 PM EDT was:
  The skies were partly cloudy.
  Temperature: 81F ( 27C)  Dewpoint:  66F ( 19C)  Relative Humidity:  62%
  Winds from the S  (190 degs) at  6 mph.
  Pressure: 1010.8 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 09:52 PM EDT was:
  The skies were partly cloudy.
  Temperature: 81F ( 27C)  Dewpoint:  66F ( 19C)  Relative Humidity:  62%
  Winds from the S  (180 degs) at  6 mph.
  Pressure: 1011.0 millibars.  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 10:52 PM EDT was:
  The skies were clear.
  Temperature: 80F ( 27C)  Dewpoint:  68F ( 20C)  Relative Humidity:  67%
  Winds from the S  (190 degs) at  7 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 11:52 PM EDT was:
  The skies were clear.
  Temperature: 79F ( 26C)  Dewpoint:  68F ( 20C)  Relative Humidity:  70%
  Winds from the S  (190 degs) at  6 mph.
  Pressure: 1010.1 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 12:52 AM EDT was:
  The skies were clear.
  Temperature: 79F ( 26C)  Dewpoint:  69F ( 21C)  Relative Humidity:  72%
  Winds from the S  (190 degs) at  8 mph.
  Pressure: 1009.9 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 01:52 AM EDT was:
  The skies were clear.
  Temperature: 78F ( 26C)  Dewpoint:  69F ( 21C)  Relative Humidity:  74%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1009.8 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was  85F.
  The minimum temperature in the past 6 hours was  78F.

The weather observed at WASHINGTON DC, VA (KIAD) at 02:52 AM EDT was:
  The skies were clear.
  Temperature: 77F ( 25C)  Dewpoint:  70F ( 21C)  Relative Humidity:  78%
  Winds from the SSW(200 degs) at  6 mph.
  Pressure: 1009.9 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 03:52 AM EDT was:
  The skies were clear.
  Temperature: 73F ( 23C)  Dewpoint:  70F ( 21C)  Relative Humidity:  89%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.1 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 04:52 AM EDT was:
  The skies were clear.
  Temperature: 74F ( 23C)  Dewpoint:  69F ( 21C)  Relative Humidity:  85%
  Winds from the CLM(CLM degs) at  0 mph.
  Pressure: 1010.5 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 05:52 AM EDT was:
  The skies were clear.
  Temperature: 73F ( 23C)  Dewpoint:  70F ( 21C)  Relative Humidity:  89%
  Winds from the SE (150 degs) at  6 mph.
  Pressure: 1010.5 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 06:52 AM EDT was:
  The skies were mostly clear.
  Temperature: 77F ( 25C)  Dewpoint:  72F ( 22C)  Relative Humidity:  83%
  Winds from the S  (190 degs) at  5 mph.
  Pressure: 1011.2 millibars.  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 07:52 AM EDT was:
  The skies were mostly clear.
  Temperature: 79F ( 26C)  Dewpoint:  71F ( 22C)  Relative Humidity:  77%
  Winds from the S  (190 degs) at  5 mph.
  Pressure: 1011.6 millibars.  Altimeter:29.89 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was  79F.
  The minimum temperature in the past 6 hours was  73F.

The weather observed at WASHINGTON DC, VA (KIAD) at 08:52 AM EDT was:
  The skies were mostly clear.
  Temperature: 84F ( 29C)  Dewpoint:  72F ( 22C)  Relative Humidity:  66%
  Winds from the S  (190 degs) at  7 mph.
  Pressure: 1011.3 millibars.  Altimeter:29.88 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 09:52 AM EDT was:
  The skies were mostly clear.
  Temperature: 90F ( 32C)  Dewpoint:  72F ( 22C)  Relative Humidity:  56%
  Winds from the SSW(200 degs) at  9 mph.
  Pressure: 1010.9 millibars.  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 10:52 AM EDT was:
  The skies were mostly clear.
  Temperature: 94F ( 34C)  Dewpoint:  71F ( 22C)  Relative Humidity:  48%
  Winds from the S  (190 degs) at 12 mph.
  Pressure: 1010.8 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 11:52 AM EDT was:
  The skies were mostly clear.
  Temperature: 97F ( 36C)  Dewpoint:  70F ( 21C)  Relative Humidity:  42%
  Winds from the S  (190 degs) at 13 mph.
  Pressure: 1010.8 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 12:52 PM EDT was:
  The skies were mostly clear.
  Temperature: 97F ( 36C)  Dewpoint:  70F ( 21C)  Relative Humidity:  42%
  Winds from the S  (190 degs) at  9 mph.
  Pressure: 1010.1 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 01:52 PM EDT was:
  The skies were mostly clear.
  Temperature: 99F ( 37C)  Dewpoint:  69F ( 21C)  Relative Humidity:  38%
  Winds from the SW (210 degs) at 13 mph.
  Pressure: 1009.5 millibars.  Altimeter:29.82 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  79F.

The weather observed at WASHINGTON DC, VA (KIAD) at 02:52 PM EDT was:
  The skies were mostly clear.
  Temperature:100F ( 38C)  Dewpoint:  68F ( 20C)  Relative Humidity:  35%
  Winds from the SW (230 degs) at  8 mph.
  Pressure: 1008.8 millibars.  Altimeter:29.80 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KIAD) at 03:52 PM EDT was:
  The skies were partly cloudy.
  Temperature:100F ( 38C)  Dewpoint:  70F ( 21C)  Relative Humidity:  37%
  Winds from the SW (210 degs) at 10 mph.
  Pressure: 1008.0 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

KIAD   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          69          88    65
TMP  99 98 88 82 78 75 80 90 93 91 83 77 72 71 73 80 85 86 81 71 71
DPT  63 64 68 69 69 68 71 70 67 68 71 72 70 68 68 65 63 62 62 61 59
CLD  BK BK BK OV BK BK SC BK BK OV OV OV OV OV BK BK BK BK BK BK SC
WDR  22 23 24 26 28 22 21 22 24 25 30 00 31 31 33 33 33 32 28 35 36
WSP  12 12 05 04 03 02 03 07 10 11 07 00 06 04 05 07 07 06 04 05 07
P06         7    24     7     2    62    58     7    13     5 14 11
P12                    31          72          64          16    14
Q06         0     0     0     0     4     2     0     0     0  0  0
Q12                     0           3           2           0     0
T06     32/35 25/11  2/ 1  4/10 45/38 23/11  1/ 1  3/ 6  9/19  1/ 0
T12           45/40        5/12       48/40        3/ 6    10/22
CIG   8  8  8  8  8  8  8  8  8  7  6  6  7  7  7  7  7  8  8  8  8
VIS   7  7  7  7  7  7  7  7  7  7  6  6  7  7  7  7  7  7  7  7  7
OBV   N  N  N  N  N  N  N  N  N  N  N HZ  N  N  N  N  N  N  N  N  N

GFS Long-Range Model Output Statistics (MOS) Forecast

KIAD   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| 69  88| 65  88| 68  91| 68  90| 69  92| 70  89| 68 64 87
TMP  80  83| 73  81| 71  82| 75  82| 75  81| 75  83| 75  81| 74
DPT  71  71| 68  62| 59  59| 65  65| 68  66| 69  67| 68  68| 67
CLD  PC  OV| OV  OV| PC  PC| PC  OV| OV  OV| OV  OV| OV  OV| OV
WND   5  11|  7   7|  7   7|  6   7|  5   6|  4   7|  5   7|  6
P12  31  72| 64  16| 14   5| 12  16| 19  23| 19  20| 27  30| 28 20 23
P24      78|     65|     14|     17|     36|     30|     47|       34
Q12   0   3|  2   0|  0   0|  0   0|  0   0|  0   0|       |
Q24       3|      2|      0|      0|      0|      0|       |
T12  25  45| 23   9|  6   8|  5  17| 13  23| 13  24| 18  28| 14
T24        | 45    |  9    |  8    | 19    | 25    | 34    | 31

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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