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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

KDCA 151952Z 17012KT 10SM SCT070 SCT250 37/21 A2985 RMK AO2 SLP107 T03720211=
KDCA 152052Z 19010G19KT 10SM SCT065 BKN250 37/21 A2983 RMK AO2 LTG DSNT N AND
 NW SLP099 CB DSNT SW-NW MOV E T03670206 58022=
KDCA 152148Z 33017G29KT 10SM TS FEW065CB BKN160 BKN250 33/19 A2987 RMK AO2 PK
 WND 29029/2146 LTG DSNT N AND NW TSB48 PRESRR OCNL LTGICCG VC NW-N TS NW-N MOV
 E=
KDCA 152152Z 32013G29KT 10SM TS FEW065CB BKN160 BKN250 32/18 A2987 RMK AO2 PK
 WND 29029/2146 WSHFT 2135 LTG DSNT N AND NW TSB48 SLP114 OCNL LTGICCG VC NW-N
 TS NW-N MOV E T03170183=
KDCA 152159Z 34016G25KT 10SM TS SCT070CB BKN160 BKN250 31/19 A2987 RMK AO2
 WSHFT 2139 OCNL LGTICCG VC N-NE TS N-NE MOV E T03110189=
KDCA 152223Z 35004KT 10SM FEW070CB BKN160 BKN250 32/19 A2984 RMK AO2 WSHFT 2139
 LTG DSNT NE AND E TSE22 CB VC NE-E MOV E T03170194=
KDCA 152252Z 16005KT 10SM FEW075 SCT160 BKN210 32/21 A2983 RMK AO2 WSHFT 2139
 TSE22 SLP101 T03170211=
KDCA 152352Z 21006KT 10SM FEW080 FEW160 BKN220 33/19 A2982 RMK AO2 SLP097
 T03280194 10389 20306 58004=
KDCA 160052Z 19008KT 10SM FEW085 FEW170 SCT220 32/18 A2984 RMK AO2 SLP102
 T03220183=
KDCA 160152Z 21005KT 10SM CLR 31/18 A2985 RMK AO2 SLP107 T03110183=
KDCA 160152Z COR 21005KT 10SM FEW080 FEW160 SCT230 31/18 A2985 RMK AO2 SLP107
 T03110183=
KDCA 160252Z 20007KT 10SM FEW085 BKN180 BKN240 30/19 A2985 RMK AO2 SLP106
 T03000194 50011=
KDCA 160352Z 22004KT 10SM FEW180 BKN250 29/19 A2983 RMK AO2 SLP100 T02890194=
KDCA 160452Z 21005KT 10SM BKN250 28/21 A2983 RMK AO2 SLP099 T02830206 403890272=
KDCA 160552Z 23007KT 10SM BKN250 28/21 A2982 RMK AO2 SLP096 T02830211 10328
 20283 56010=
KDCA 160652Z 20007KT 10SM BKN250 28/21 A2982 RMK AO2 SLP098 T02780211=
KDCA 160752Z 18007KT 10SM SCT250 27/21 A2983 RMK AO2 SLP100 T02670211=
KDCA 160852Z 22004KT 10SM SCT250 27/21 A2985 RMK AO2 SLP106 T02670211 53009=
KDCA 160952Z 19007KT 10SM FEW150 FEW250 27/22 A2985 RMK AO2 SLP107 T02670217=
KDCA 161052Z 21005KT 10SM FEW080 FEW150 27/22 A2986 RMK AO2 SLP111 T02720222=
KDCA 161152Z 22007KT 10SM SCT140 28/22 A2988 RMK AO2 SLP117 T02830222 10289
 20267 53010=
KDCA 161252Z 17008KT 9SM FEW140 FEW250 30/23 A2987 RMK AO2 SLP115 T03000233=
KDCA 161352Z 17010KT 9SM FEW250 32/23 A2985 RMK AO2 SLP109 T03170233=
KDCA 161452Z 17009KT 9SM CLR 34/23 A2986 RMK AO2 SLP109 T03390233 55006=
KDCA 161552Z 17012KT 10SM FEW075 FEW250 36/23 A2985 RMK AO2 SLP107 T03560228=
KDCA 161652Z 18011G19KT 10SM FEW075 38/19 A2984 RMK AO2 SLP104 T03830194=
KDCA 161752Z 17014KT 10SM FEW075 38/21 A2980 RMK AO2 SLP092 T03830206 10389
 20283 58018=
KDCA 161852Z 21016G24KT 10SM FEW075 39/18 A2979 RMK AO2 SLP086 T03940178=
KDCA 161952Z 20014KT 10SM FEW080 SCT150 39/19 A2977 RMK AO2 PK WND 20026/1906
 SLP079 T03940189=

Decoded Surface Observations


The weather observed at WASHINGTON DC, VA (KDCA) at 03:52 PM EDT was:
  The skies were partly cloudy.
  Temperature: 99F ( 37C)  Dewpoint:  70F ( 21C)  Relative Humidity:  40%
  Winds from the S  (170 degs) at 14 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 04:52 PM EDT was:
  The skies were mostly cloudy.
  Temperature: 98F ( 37C)  Dewpoint:  69F ( 21C)  Relative Humidity:  39%
  Winds from the S  (190 degs) at 12 mph.
  Pressure: 1009.9 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 05:48 PM EDT was:
  The skies were mostly cloudy.
  The weather reported was a thunderstorm.
  Temperature: 91F ( 33C)  Dewpoint:  66F ( 19C)  Relative Humidity:  44%
  Winds from the NW (330 degs) at 20 mph.
  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 05:52 PM EDT was:
  The skies were mostly cloudy.
  The weather reported was a thunderstorm.
  Temperature: 90F ( 32C)  Dewpoint:  64F ( 18C)  Relative Humidity:  43%
  Winds from the NW (320 degs) at 15 mph.
  Pressure: 1011.4 millibars.  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 05:59 PM EDT was:
  The skies were mostly cloudy.
  The weather reported was a thunderstorm.
  Temperature: 88F ( 31C)  Dewpoint:  66F ( 19C)  Relative Humidity:  49%
  Winds from the NNW(340 degs) at 18 mph.
  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 06:23 PM EDT was:
  The skies were mostly cloudy.
  Temperature: 90F ( 32C)  Dewpoint:  66F ( 19C)  Relative Humidity:  46%
  Winds from the N  (350 degs) at  5 mph.
  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 06:52 PM EDT was:
  The skies were mostly cloudy.
  Temperature: 90F ( 32C)  Dewpoint:  70F ( 21C)  Relative Humidity:  52%
  Winds from the SSE(160 degs) at  6 mph.
  Pressure: 1010.1 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 07:52 PM EDT was:
  The skies were mostly cloudy.
  Temperature: 91F ( 33C)  Dewpoint:  67F ( 19C)  Relative Humidity:  45%
  Winds from the SW (210 degs) at  7 mph.
  Pressure: 1009.7 millibars.  Altimeter:29.82 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was 102F.
  The minimum temperature in the past 6 hours was  87F.

The weather observed at WASHINGTON DC, VA (KDCA) at 08:52 PM EDT was:
  The skies were partly cloudy.
  Temperature: 90F ( 32C)  Dewpoint:  64F ( 18C)  Relative Humidity:  43%
  Winds from the S  (190 degs) at  9 mph.
  Pressure: 1010.2 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 09:52 PM EDT was:
  The skies were clear.
  Temperature: 88F ( 31C)  Dewpoint:  64F ( 18C)  Relative Humidity:  46%
  Winds from the SW (210 degs) at  6 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 09:52 PM EDT was:
  The skies were partly cloudy.
  Temperature: 88F ( 31C)  Dewpoint:  64F ( 18C)  Relative Humidity:  46%
  Winds from the SW (210 degs) at  6 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 10:52 PM EDT was:
  The skies were mostly cloudy.
  Temperature: 86F ( 30C)  Dewpoint:  67F ( 19C)  Relative Humidity:  53%
  Winds from the SSW(200 degs) at  8 mph.
  Pressure: 1010.6 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 11:52 PM EDT was:
  The skies were mostly cloudy.
  Temperature: 84F ( 29C)  Dewpoint:  66F ( 19C)  Relative Humidity:  55%
  Winds from the SW (220 degs) at  5 mph.
  Pressure: 1010.0 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 12:52 AM EDT was:
  The skies were mostly cloudy.
  Temperature: 83F ( 28C)  Dewpoint:  69F ( 21C)  Relative Humidity:  63%
  Winds from the SW (210 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 (KDCA) at 01:52 AM EDT was:
  The skies were mostly cloudy.
  Temperature: 83F ( 28C)  Dewpoint:  70F ( 21C)  Relative Humidity:  65%
  Winds from the SW (230 degs) at  8 mph.
  Pressure: 1009.6 millibars.  Altimeter:29.82 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was  91F.
  The minimum temperature in the past 6 hours was  83F.

The weather observed at WASHINGTON DC, VA (KDCA) at 02:52 AM EDT was:
  The skies were mostly cloudy.
  Temperature: 82F ( 28C)  Dewpoint:  70F ( 21C)  Relative Humidity:  66%
  Winds from the SSW(200 degs) at  8 mph.
  Pressure: 1009.8 millibars.  Altimeter:29.82 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 03:52 AM EDT was:
  The skies were partly cloudy.
  Temperature: 81F ( 27C)  Dewpoint:  70F ( 21C)  Relative Humidity:  70%
  Winds from the S  (180 degs) at  8 mph.
  Pressure: 1010.0 millibars.  Altimeter:29.83 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 04:52 AM EDT was:
  The skies were partly cloudy.
  Temperature: 80F ( 27C)  Dewpoint:  70F ( 21C)  Relative Humidity:  71%
  Winds from the SW (220 degs) at  5 mph.
  Pressure: 1010.6 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 05:52 AM EDT was:
  The skies were mostly clear.
  Temperature: 81F ( 27C)  Dewpoint:  72F ( 22C)  Relative Humidity:  74%
  Winds from the S  (190 degs) at  8 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 06:52 AM EDT was:
  The skies were mostly clear.
  Temperature: 81F ( 27C)  Dewpoint:  72F ( 22C)  Relative Humidity:  74%
  Winds from the SW (210 degs) at  6 mph.
  Pressure: 1011.1 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 07:52 AM EDT was:
  The skies were partly cloudy.
  Temperature: 83F ( 28C)  Dewpoint:  72F ( 22C)  Relative Humidity:  70%
  Winds from the SW (220 degs) at  8 mph.
  Pressure: 1011.7 millibars.  Altimeter:29.88 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was  84F.
  The minimum temperature in the past 6 hours was  80F.

The weather observed at WASHINGTON DC, VA (KDCA) at 08:52 AM EDT was:
  The skies were mostly clear.
  Temperature: 86F ( 30C)  Dewpoint:  73F ( 23C)  Relative Humidity:  66%
  Winds from the S  (170 degs) at  9 mph.
  Pressure: 1011.5 millibars.  Altimeter:29.87 inches of mercury.
  The prevailing visibility was 9 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 09:52 AM EDT was:
  The skies were mostly clear.
  Temperature: 90F ( 32C)  Dewpoint:  73F ( 23C)  Relative Humidity:  59%
  Winds from the S  (170 degs) at 12 mph.
  Pressure: 1010.9 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 9 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 10:52 AM EDT was:
  The skies were clear.
  Temperature: 93F ( 34C)  Dewpoint:  74F ( 23C)  Relative Humidity:  54%
  Winds from the S  (170 degs) at 10 mph.
  Pressure: 1010.9 millibars.  Altimeter:29.86 inches of mercury.
  The prevailing visibility was 9 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 11:52 AM EDT was:
  The skies were mostly clear.
  Temperature: 97F ( 36C)  Dewpoint:  73F ( 23C)  Relative Humidity:  47%
  Winds from the S  (170 degs) at 14 mph.
  Pressure: 1010.7 millibars.  Altimeter:29.85 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 12:52 PM EDT was:
  The skies were mostly clear.
  Temperature:100F ( 38C)  Dewpoint:  66F ( 19C)  Relative Humidity:  33%
  Winds from the S  (180 degs) at 13 mph.
  Pressure: 1010.4 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 01:52 PM EDT was:
  The skies were mostly clear.
  Temperature:101F ( 38C)  Dewpoint:  69F ( 21C)  Relative Humidity:  36%
  Winds from the S  (170 degs) at 16 mph.
  Pressure: 1009.2 millibars.  Altimeter:29.80 inches of mercury.
  The prevailing visibility was 10 miles.
  The maximum temperature in the past 6 hours was 102F.
  The minimum temperature in the past 6 hours was  83F.

The weather observed at WASHINGTON DC, VA (KDCA) at 02:52 PM EDT was:
  The skies were mostly clear.
  Temperature:102F ( 39C)  Dewpoint:  64F ( 18C)  Relative Humidity:  29%
  Winds from the SW (210 degs) at 18 mph.
  Pressure: 1008.6 millibars.  Altimeter:29.79 inches of mercury.
  The prevailing visibility was 10 miles.

The weather observed at WASHINGTON DC, VA (KDCA) at 03:52 PM EDT was:
  The skies were partly cloudy.
  Temperature:102F ( 39C)  Dewpoint:  66F ( 19C)  Relative Humidity:  31%
  Winds from the SSW(200 degs) at 16 mph.
  Pressure: 1007.9 millibars.  Altimeter:29.77 inches of mercury.
  The prevailing visibility was 10 miles.

Short Range Forecast

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Zone Forecast

DCZ001-162300-
District of Columbia-
Including the city of Washington
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 102. Southwest winds around 10 mph
with gusts up to 20 mph. Chance of rain 30 percent. Heat index
values up to 110.
.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
upper 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 mid 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 upper 80s. North winds
around 5 mph. Chance of rain 40 percent.
.THURSDAY NIGHT...Partly cloudy. Lows in the upper 60s.
.FRIDAY...Mostly sunny. Highs in the upper 80s.
.FRIDAY NIGHT...Partly cloudy. Lows around 70.
.SATURDAY...Partly sunny. Highs in the upper 80s.
.SATURDAY NIGHT...Mostly cloudy. Lows in the lower 70s.
.SUNDAY...Partly sunny. Highs around 90.
.SUNDAY NIGHT...Mostly cloudy. Lows in the lower 70s.
.MONDAY...Partly sunny with a chance of showers and
thunderstorms. Highs in the upper 80s. Chance of rain 40 percent.


State Forecast

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State Forecast Discussion

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GFS Short-Range Model Output Statistics (MOS) Forecast

KDCA   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                    79          96          74          90    72
TMP  99 98 92 87 83 81 83 90 94 91 84 80 77 75 77 82 87 88 83 76 75
DPT  67 67 69 71 71 71 71 71 70 71 73 74 72 70 69 66 64 63 62 64 63
CLD  SC SC BK OV SC BK SC BK BK OV OV OV OV OV OV BK BK BK BK BK BK
WDR  19 20 23 24 29 27 20 19 20 23 28 21 29 32 34 35 35 33 16 34 01
WSP  13 14 07 04 04 03 05 08 11 15 07 04 08 06 07 07 08 08 06 07 10
P06         8    23     7     1    59    65    11    15     4 14 14
P12                    30          66          74          15    14
Q06         0     0     0     0     4     3     0     0     0  0  0
Q12                     0           3           3           0     0
T06     30/42 26/15  3/ 2  3/ 9 47/42 27/15  2/ 2  4/ 6 10/20  2/ 0
T12           43/43        3/13       54/43        4/ 7    13/22
CIG   8  8  8  8  8  8  8  8  8  8  6  5  7  7  7  7  7  8  8  8  8
VIS   7  7  7  7  7  7  7  7  7  7  7  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

KDCA   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  79  96| 74  90| 72  89| 73  91| 75  91| 75  92| 74  89| 74 67 88
TMP  83  84| 77  83| 75  83| 77  84| 78  84| 78  84| 77  83| 77
DPT  71  73| 69  62| 63  61| 66  67| 68  69| 69  68| 69  68| 69
CLD  PC  OV| OV  OV| PC  PC| PC  OV| OV  OV| OV  OV| OV  OV| OV
WND   7  15|  8   8| 10  10|  7   9|  7   7|  6   7|  7   9|  7
P12  30  66| 74  15| 14   6| 12  16| 18  24| 22  21| 29  28| 28 20 23
P24      71|     74|     16|     16|     37|     33|     47|       34
Q12   0   3|  3   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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