District of ColumbiaSite status

Severe weather analysis

Observations and analyses of the atmosphere now, from NWS, WPC and SPC. Not a forecast and not a warning: for those, see the Briefing and the Live tracker.

SPC soundings: feeds current

SPC soundings: Feed current; checked .

Checked means retrieved, not newly issued. Each graphic retains its issue, observation, initialization or valid time. Site publishing status is separate.

Soundings: what weather balloons measured

SPC’s skew-T diagram and hodograph of the sounding at Yarmouth, Nova Scotia (YQI), 00Z. Its levels are in the table below.
Observed Sounding at Yarmouth, Nova Scotia (YQI), for (5 h 6 min ago). SPC’s graphic; the values in its panels (CAPE, shear, the indices) are SPC’s computations from these levels. Data: NOAA/SPC.

A balloon launched about an hour before the time named, measuring as it rose and drifted with the wind: the atmosphere above one place, at one time. Model soundings, which are forecasts, are not shown here.

The levels this sounding was drawn from (56)
Yarmouth, Nova Scotia (YQI): the surface first, then up through the atmosphere. Temperature and dew point in °C, as measured.
PressureHeightTemperatureDew pointWind
998 mb9 m14.013.7185° 13 kt
979 mb178 m13.413.4—
965 mb305 m14.114.1210° 45 kt
932 mb610 m15.615.6230° 57 kt
925 mb680 m16.016.0235° 57 kt
900 mb914 m15.715.7245° 52 kt
868 mb1219 m14.814.8240° 50 kt
850 mb1400 m14.214.2240° 47 kt
808 mb1829 m12.212.2245° 45 kt
779 mb2134 m10.710.7245° 50 kt
751 mb2438 m9.39.3245° 46 kt
724 mb2743 m7.37.3250° 49 kt
700 mb3019 m5.65.5260° 47 kt
666 mb3425 m2.0-1.0—
647 mb3658 m1.7-0.2260° 62 kt
618 mb4028 m-0.3-0.3—
600 mb4267 m-2.0-2.3255° 64 kt
574 mb4616 m-4.5-5.2—
560 mb4810 m-6.1-10.6—
546 mb5008 m-6.7-11.7—
532 mb5211 m-8.1-9.7—
521 mb5373 m-9.3-19.3—
502 mb5659 m-11.1-20.1—
500 mb5690 m-11.1-21.1250° 73 kt
486 mb5907 m-12.3-25.3—
474 mb6096 m-12.9-22.0245° 83 kt
464 mb6259 m-13.9-38.9—
446 mb6559 m-14.7-41.7—
416 mb7080 m-18.9-40.9—
400 mb7370 m-21.3-32.3240° 84 kt
387 mb7620 m-23.3-35.3240° 85 kt
366 mb8020 m-26.3-42.3—
356 mb8230 m-24.7-50.3250° 88 kt
341 mb8534 m-24.6-53.1250° 86 kt
319 mb9018 m-27.6-50.7255° 105 kt
305 mb9342 m-30.1-48.1—
300 mb9460 m-31.3-50.3255° 101 kt
257 mb10532 m-39.9-56.9—
250 mb10720 m-40.9-59.9255° 98 kt
236 mb11109 m-43.1-67.1—
200 mb12192 m-51.4-69.5260° 102 kt
200 mb12200 m-51.5-69.5260° 101 kt
150 mb14020 m-62.5-79.5265° 85 kt
129 mb14935 m-65.8-82.3270° 64 kt
113 mb15746 m-68.9-83.9255° 62 kt
100 mb16459 m-69.2-85.3275° 56 kt
100 mb16480 m-69.3-85.3255° 46 kt
86 mb17374 m-65.5-85.9270° 48 kt
74 mb18288 m-65.3-87.3255° 35 kt
64 mb19202 m-62.2-87.3250° 37 kt
52 mb20422 m-60.6-86.9200° 16 kt
41 mb21946 m-59.4-86.5265° 5 kt
31 mb23774 m-56.2-85.0230° 14 kt
20 mb26500 m-54.9-84.9270° 14 kt
10 mb30980 m-48.5-82.5275° 14 kt
5 mb35313 m-42.7-80.7—
Every station with a sounding (78)

SPC observed soundings checked · Data: NOAA/SPC

District of Columbia briefing

Not an official warning service. Warnings and watches are the National Weather Service’s, outlooks and reports the Storm Prediction Center’s and the Weather Prediction Center’s (Data: NOAA/NWS, NOAA/SPC, NOAA/WPC). When a warning is issued for you, act on it, and use weather.gov or a NOAA Weather Radio for where you are.