D.C.’s hottest June day on record, storms possible overnight

11:45 p.m. update: Strong to severe storms have developed in southern Fauquier, Prince William and extreme southern Fairfax county. These storms may produce large hail as they head east towards Charles county. A severe thunderstorm warning covers these areas through midnight. This will be the last update for this evening, but to track any storms overnight, try our “interactive” radar/map on the Weather Wall at Postweather.com

9:15 p.m. update: The worst of the storms have passed Baltimore and just widely scattered showers and thundershowers continue to the south, mainly in Montgomery county into northern Fairfax county. This activity should gradually diminish as it heads off to the east. A few additional showers and storms could pop up overnight but otherwise just expect muggy conditions as described below.

8:45 p.m. update: While many areas in the immediate D.C. area could use the rain, it looks like storms are once again trying to avoid them. A severe thunderstorm warning is in effect for Baltimore city and Baltimore county until 9:30 p.m., but the storms to the south in Fairfax and Montgomery county are widely scattered, disorganized and weakening. The National Weather Service reports storms in Loudoun county produced half dollar sized hail in Middleburg just before 7:30 p.m.

Record highs:Here are the highs: 102 at National, 97 at Dulles and 100 at Baltimore. Hottest June day ever (tied) at D.C. Yuck!

Through Tonight: It’s way too hot heading into the evening, as temperatures slowly fall off highs and through the 90s. By 6 p.m.-8 p.m or so, scattered showers and storms should be approaching or entering the area. Some of these may be severe (watches are up just north and possible here later), with wind damage the main threat, along with potentially very heavy rain and lightning. Storms could then last into the overnight. Good news is they may cool things off a bit! Overnight lows range from the upper 60s to the mid-70s, perhaps a little warmer downtown should we escape cooling rain.

Tomorrow (Friday): Partly cloudy skies of the morning increasingly bubble heading into the afternoon, and scattered showers and t’storms are a good bet into the evening. Normally this would still be classified as a pretty hot one, though after the last two days, maybe not as much, as highs reach near 90 to the mid-90s. Some storms could be strong or severe, and again heavy rain will be a threat where they occur with all this moisture in the atmosphere.

See David Streit’s forecast through the beginning of next week. And if you haven’t already, join us on Facebook and follow us on Twitter .

La Nina and May U.S. weather recap:The Climate Prediction Center announced today that La Nina is finished, as ENSO-neutral conditions re-appeared in May. There may still be some lingering atmospheric effects, but neutral conditions are expected through summer. And speaking of May, the U.S. was slightly cooler and wetter than normal during the month -- not around here though.

Pollen update: Susan Kosisky of Walter Reed writes, “Tree pollen is LOW (NAB range) at 4.79 gr/cubic meter which is MODERATE for our local area. Grass pollen is MODERATE (NAB range) at 6.39 gr/cubic meter which his HIGH for our local area grass counts. Weed pollen is LOW at 2.56 gr/cubic meter and mold spores are in the MODERATE range at 6711.68 spores/cubic meter.”

8:15 p.m. update:The severe t’storm watch has expired, but a few bigger storms are still roaming. One severe warning is in effect until 8:45 p.m. in Anne Arundel and Howard counties, and this storm will move out of the area shortly. The storm moving east over Loudoun County toward Fairfax is currently weakening, but it may hold together on its way toward D.C.

7:40 p.m. update:None of the activity in the immediate area is severe warned, though storms producing heavy rain and lightning are still impacting western suburbs. A severe t’storm warning is up until 8:15 p.m. for Frederick and Carroll counties where hail to the size of quarters and winds to 60 mph are possible. Very heavy rain has fallen in parts of Loudoun County and surrounds, be wary for water on roads.

6:55 p.m. update: A line of storms moving slowly east has prompted another severe t’storm warning, this time for much of the western part of the area until 7:30 p.m. Winds to 60 mph and hail to the size of quarters is possible with this activity, along with heavy rain and lightning.

6:15 p.m. update:A Severe T’storm Warning is in effect for southern Loudoun and northern Fauquier counties until 7:00 p.m. Ping pong size hail is possible with this storm.

6:00 p.m. update:A Severe T’storm Warning is in effect for Loudoun County until 6:45 p.m. This storm may produce hail up to the size of half dollars and strong winds. Other activity remains rather isolated, but may increase in coverage as it heads into the area.

5:10 p.m. update:According to the National Weather Service, National hit at least 102 this afternoon, this ties both the daily record high and the monthly record high — both set on this date in 1874. We’ll update with official highs shortly.

4:35 p.m. update:The Severe T’storm Watch up to our northwest has been expanded eastward, now covering all but southeastern portions of the area through 8 p.m. A few isolated storms have formed over far western ‘burbs and activity is likely to increase heading into evening. National has hit at least 101 now, with Dulles still at 95.

3:30 p.m.: We’ve broken more local records today as highs top out in the upper 90s to near 100 this afternoon. Baltimore has set a new high temp record with 100 (thus far), and D.C. has hit 99 (3 shy), while Dulles is hovering at 95 (1 shy). Happily, this is the peak of the heat, and a cold front, which will drift toward the area before stalling out, should bring some relief, mainly in the form of increased clouds and storm risks starting this evening into tomorrow.

Ian Livingston is a forecaster/photographer and information lead for the Capital Weather Gang. By day, Ian is a defense and national security researcher at a D.C. think tank.

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