From the ABC 7 Weather team

Archive for June 2015

Saturday Soaker with Some Severe Storms

June 26, 2015 - 06:51 AM
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It's been a wet start to the month of June.  As of this writing, June has received 9.18"  of rain at Reagan National, which is 6.03" over the average for the month!  Get ready to add an additional 1-3" to that total, Saturday.

A strong area of low pressure will develop over the Ohio River Valley, Saturday, bringing heavy rain and possible severe storms to the area.  Here's a look at the surface features forecast for Saturday at 8 PM courtesy of the Weather Prediction Center.

Weather Prediction Center

Rain will move in from west to east Saturday morning.  Here's a look at our simulated radar at 8 AM Saturday. 

Radar simulation at 8AM Saturday

Heavier rain and possible severe storms move in later in the afternoon and evening.  Here's another snapshot of our local futurecast at 8 PM.  Notice the brighter colors, indicating heavier precipitation.

Radar simulation at 8PM Saturday

Rain totals could reach 1-3", so flooding is a concern.  The entire ABC7 viewing area is under a Flash Flood Watch from late tonight through late Saturday night.

Here is another local computer simulation forecasting rainfall accumulations through Sunday morning.  Remember, if you encounter standing water on the roads, turn around, don't drown.
Accumulated Rain Projection through Sunday AM

Along with the threat of flooding, also comes the risk of strong, to severe, storms.  The dynamics with this system will be conducive to gusty winds and an isolated tornado.  The Storm Prediction Center has put our region under the 'Slight' risk category. 

Storm Prediction Center

You'll want to stay weather alert on Saturday.  Stay with ABC7, NewsChannel, and right here at WJLA.com.  If you're on the go, download our free, StormWatch7 weather app.  Live radar, alerts, and more.

StormWatch7 Mobile App

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Washington D.C. Weather: record warm June underway

June 22, 2015 - 09:54 AM
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We’re just two-thirds of the way through the month, and D.C. is already in the number 6 position for warmest Junes in the record books! Ten of the last 21 days have been in the 90s, making our average monthly temperature 78.0 degrees. That’s almost 4° above normal. According to National Climatic Data Center records in Washington, D.C. dating back to 1871, there are only 5 instances in which we were warmer. Keep in mind that those records include a full 30 days and here we are pushing the top five with eight more days to go!

Warmest Junes in DC since 1871

I am confident that today, the 22nd, we will continue this well above average trend, easily breaking the 90 degree mark. Tomorrow will be even hotter and there is a chance that we could set new all-time daily record highs. We are forecasting mid 90s with the record at Reagan National of 98° and at Dulles of 96° both set back in 1988.

A cold front will drop the heat and humidity by mid-week with upper 80s replacing the current 90s but we will still remain slightly, above the average of 86/87 through Friday. The weekend will then bring our first below-average set of days. Looking at the Climate Prediction Centers outlook for the remainder of the month, we have equal chances of above or below average temperatures which likely means no more extremes. However, the numbers thus far speak for themselves and I certainly will remember this month as a toasty one. But before you start to complain about the recent spate of high heat, let’s not forget about the well below average winter we just experienced. The month of February was nearly 9 degrees below average temperatures.

Past Six Months

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Heavy rainfall possible this weekend in the D.C. area

June 19, 2015 - 12:30 PM
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On facebook? Be sure to connect with me here for the latest weather information.

Let's face it, it's been a very wet June so far, with rainfall recorded in 11 out of the first 18 days and more on the way. So far this month, Reagan National has recorded 5.34" of rain which is more than 3 inches above normal. Average rainfall for the month is typically around 4 inches.

Enough climate data Alex, is Father's Day weekend going to be a washout or not?

While heavy rain is in the forecast, I don't think you'll need to carry your umbrella everywhere with you this weekend. Saturday should start cloudy and mild with temperatures in the low to mid 80s by the afternoon. Some sunshine should peek through the overcast by the afternoon.

Rainfall Potential

Here's where you'll need your umbrella. Shower and thunderstorm activity is expected to increase Saturday evening and will continue through early Sunday morning. If you have outdoor plans Saturday evening into Saturday night, be sure to give Doppler radar a look.

By Sunday morning conditions should begin to improve. There's a chance for a few showers or storms by the afternoon hours but those should be isolated with only about a 30% chance. Highs Sunday should approach the 90 degree mark.

Precipitation Outlook from July through September from the CPC

If you are sick of the rain, there may be some good news from the Climate Prediction Center. The latest 3 month outlook for July through September is highlighting the chance for drier than normal conditions across the D.C. area. I guess it might be a good thing after all the area is getting rain while it can.

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Summer Solstice this Sunday

June 15, 2015 - 05:38 PM
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The Summer Solstice occurs at 12:39pm on Sunday ushering the region into astronomical summer. This occurs when the sun's zenith reaches its farthest northern position at the Tropic of Cancer. This coincides with the longest duration of daylight in the northern hemisphere with D.C.'s stretch coming the 18th through the 24th of June.

As far as temperatures are concerned, our average high will continue to rise through July with the warmest average high temperature hitting 89 degrees from July 7th through the 22nd. I'm not sure anyone would even realize the change though as hot as it has been in May as well as the past 5 days at 92 degrees or higher!

Duration of Daylight

There will be 14 hours and 54 minutes of daylight through the period. The region will lose 3 minutes of daylight by June 30th, and 42 minutes by July 31st. The autumnal equinox doesn't occur until September 26th when we finally head back to equal duration of daylight and darkness. Our shortest daylight hours will be experienced as usual on December 21st and 22nd with 9 hours and 26 minutes of daylight.

Sick of getting up so early because of the sun? Sunrise times will eventually push back to 6am by July 21st.

Sunrise and sunset times

 

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Improvements by the weekend in D.C. and at the beach

June 4, 2015 - 03:00 PM
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It has now been two days in a row with temperatures in the mid 60s. Rain continues to be a threat tonight into Friday morning. So far through the first four days of June, Reagan National Airport has received over 3 inches of rain. The average for the month is 3.78", so we're not far off!

The transitional day is Friday. Clouds, drizzle, a few showers and some patchy fog will be likely in the morning hours. Low temperatures will be in the 50s in the suburbs to near 60 degrees around town. Rain should taper off by the early afternoon as the low pressure moves east of D.C. and the area gets a little subsidence to help dry us out. We're even expecting a few peeks of sunshine by the later afternoon and evening! Don't forget to head out to Celebrate Fairfax tomorrow (a celebration might be in order just for the rain to stop!).

Forecast for Friday Evening

Conditions should continue to improve for the weekend ahead. Saturday will feature more sunshine and warmer temperatures with highs in the lower 80s. Though we didn't put it on our graphic below, there's still a SLIGHT chance for a few storms with the highest likelihood south and west of D.C.

High pressure will filter in overhead on Sunday making for mostly sunny to partly cloudy skies. Temperatures will be a touch cooler  in the upper 70s with a more northeasterly component to the wind.

3-Day Outlook Friday through Sunday

Delmarva Beaches:

If you're heading to the beach this weekend, conditions should be nice on Saturday with highs in the mid to upper 70s under partly sunny skies. With easterly winds expected on Sunday, not only will it be breezy at times through the day, but temperatures on the beach itself may struggle to reach the 70 degree mark. Just an FYI, the water temperature at the Ocean City Inlet was only 59 degrees as of Wednesday!

Weekend Outlook at the Beaches

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