Forecast: Heat's last gasp, cooling set to begin
Markedly cooler Sunday, rain early next week
FORECAST IN DETAIL
We've talked and talked about all the heat records we've set in 2010 but perhaps the most significant still stands: the number of 90+ days at Reagan National that occurred in 1980. Everyone knows the magic number is 67 and we're one short. Today could well be our last chance to get there and it's going to be a very close call. After today, the pattern turns cool and wet so if you like summer-like days, soak in today.
Today (Saturday): It's a balmy morning after overnight lows only in the mid-60s to the low 70s (downtown). Sunshine pushes temps into the low 80s by midday. By that time, a cold front will have moved through the area perhaps briefly increasing clouds and even triggering an isolated shower (15-20% chance). But winds from the west behind the front quickly dry things out with considerable afternoon sunshine. With cool air lagging the frontal passage, highs probably reach the upper 80s to around 90. Confidence: Medium
Tonight: Skies are clear to partly cloudy with seasonable overnight lows ranging from the mid-50s in the cooler suburbs to near 60 downtown. Confidence: Medium-High
Keep reading for the forecast into early next week...
Tomorrow (Sunday): Flow from the north and northeast means much cooler temps with highs only reaching the low-to-mid 70s. Cloud cover is likely to gradually increase in the afternoon as moisture starts to creep towards the area from the south. However, any rain should hold off until the evening. Confidence: Medium
Tomorrow Night: Light rain probably develops overnight (60% chance), especially late, as a slow moving area of low pressure develops to the southwest. Lows range from 55-60. Confidence: Medium
A soaking rain is a legitimate possibility Monday into Tuesday as low pressure - accompanied by abundant moisture from the Gulf of Mexico -- passes over the region from the south. Highs both days are most likely in the mid-70s with overnight lows near 60. By Tuesday afternoon, we may start to see some slow clearing. Confidence: Medium
| September 25, 2010; 5:00 AM ET
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