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DC Special: Hazy, Hot and Humid with PM T'storms

Matt Ross @ 8:30 AM

** Severe Thunderstorm Watch in Effect Until 11 PM **

We will have one more day of 90s, before a cold front ushers in showers, thunderstorms, and then more seasonable weather for the end of the week.

Today and Tonight

Forecast Confidence: HighVery Hot, T'storms Late. Today will be partly sunny and very hot with the heat index nearing 100 degrees. High temperatures will reach the mid 90s. An approaching cold front will bring a 40% chance of showers and thunderstorms as we head toward evening rush. Tonight, showers and thunderstorms (70%) will be on the increase as a cold front passes through the region -- a few could be strong or severe. Overnight lows will be around 70 degrees.


Forecast Confidence: HighShowers Early, Cooler Late. Wednesday will start off cloudy and muggy with a 40% chance of lingering showers and thunderstorms as a cold front clears the area. The sun will come out in the afternoon along with lower humidity levels and pleasant temperatures in the mid 80s. Refer to Jason's forecast for the rest of the week and weekend.

Pictured Above: Satellite images depicting Sea Surface Temperature (SST) anomalies from one month ago (top) and yesterday (bottom). As you can see, the El Nino regions along the Equatorial Pacific west of South America, while still running below normal, have warmed substantially over the past month. Many early predictions of a moderate to strong La Nina event next winter look to be in jeopardy. Courtesy of the NOAA Satellite and Information Service.

Climate Notes

Thanks to our warmest day so far this year yesterday (high of 95 at Reagan National), temperatures are currently averaging about 1.4 degrees above normal for June. However in recent years, few June months have averaged much above normal. We have to go back to 1996 (+2.8) to find a June where we averaged more than 2 degrees above normal for the month. With cooler temperatures in the forecast and recent climatology on our side, I think it is a good bet that if June finishes above normal it will be by less than 2 degrees -- but it will be close.

The consistent blowtorch heat of June 1996 and June 1994 will have to wait at least another year for a repeat. As I mentioned last week, June 1994 was our warmest June on record at 5 degrees above normal. 13 years ago today, when high temperatures soared to 98, we were smack dab in the middle of a historic streak of 14 consecutive 90 degree days from June 13th to June 26th. The streak featured 4 record highs, a high of 101 on the 15th, and an average high of 94.6, 10 degrees above the average for the time period. Thanks, but no thanks.

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