By Alex Sosnowski, Expert Senior Meteorologist
May 13,2014; 8:29PM,EDT
A flow of tropical moisture ahead of a slow-moving front will trigger heavy rain and raise the risk of flash and urban flooding problems along the Atlantic Seaboard late in the week.
While spotty showers and storms Tuesday and Wednesday are forecast to occur ahead of the heavier rainfall, there will be a greater risk for disruptions to outdoor activities and travel problems along the I-95 corridor on Thursday and Friday in the mid-Atlantic and on Friday and Saturday in New England.
The flood risk extends well inland to the Appalachians along the I-77, I-81 and I-85 corridors.
After a wedge of cool air trims temperatures in much of the Northeast at midweek, a front with showers and thunderstorms will push toward the East Coast late in the week.
Tropical moisture, which has produced flooding and mudslides in the Virgin Islands and Puerto Rico since last week, will be drawn northward along the Atlantic coast around the same time the front arrives from the west. While the system is not expected to develop, it is carrying tropical moisture.
The front alone has the potential to bring a general 1 to 2 inches of rain from showers and thunderstorms. However, where the tropical moisture gets involved, double that amount can fall in localized areas from Georgia to New Hampshire.
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As long as the narrow corridor of heavy rainfall continues to move along, widespread flooding problems will be avoided. If the zone of heavy rain were to stall, there is more of a risk for stream and river flooding, along with widespread urban flooding issues.
There will be minor incidents of flash and urban flooding, with poor visibility over a several-hour period as the band of heavy rain pivots slowly to the northeast later this week.
Major cities that will be impact by a period of drenching showers and thunderstorms with the associated travel delays from poor visibility include Atlanta, Charlotte, Washington, D.C., Baltimore, Pittsburgh, Philadelphia, New York City and Boston.
In the wake of the drenching rain, cooler air will roll eastward from the Midwest in time for the weekend. Similar to a storm that brought cool and unsettled conditions to the area a week ago, this new storm the upper atmosphere has the potential to bring angry clouds and spotty showers mainly during the afternoon and evening hours.
Beneath the storm in the upper atmosphere, high temperatures may be held to the 50 over the mountains and the lower 70s in many areas east of the Appalachians.
On Social Media
Weather Savior
WeatherSavior
@MisterEd5 Tropical moisture combining with strong cold front=a lot of rain in short period of time on Friday. Will keep u updated.
EPAWx Authority
EPAWA1
Friday
heavy rain w/ tropical connection along the front - could be flash
flooding (not to be confused w/ reg. flooding) and heavy downpours
Zack Shields FOX 7
zackshieldsFOX7
Late season front + moisture + upper low nearby = heavy rain possible. FLASH FLOOD WATCH from 7pm today to Noon... fb.me/16KvlxZ1A
Becki
spode411
@redpenmamapgh ..."cleared" = no longer risk for tornado. Still heavy rain, lots of flooding and severe thunderstorm warnings. Gah.
Scott Dorsett
scottdorsett
Cars navigate flooded roadways on Ferris Avenue in front of Walgreens Mon. evening after heavy rains hit Waxahachie. pic.twitter.com/SKCVYg7fYj
Walk in Forests
walkinforests
Risk of Flooding Downpours, Northeast of USA, Thursday night into Friday ... accuweather.com/en/weather-new…
Jason Hampton
JasonBHampton
Parts
of NEA and the Mo Boot heel are under a Flash Flood Watch,2-3 inches
with isolated 4+ possible. Heavy rain starts late this afternoon.
May 12- Brian Patterson · Follow · Top Commenter · Bronx, New YorkNever seen so many people complain. For all of your information....we have not had really any record high or low temps to really talk about much this Spring. We had a pretty dry April and towards the end into May we received rain and that on time - flooding rain in NYC. This is nothing to complain about and is not unusual in the transition month of Spring. A Tropical Low will be in the Atlantic (it already is) but the front that will affect us in the East will work in tandem with the moisture provided by the tropical system in the Atlantic - partly thanks to flow from the south. This Thursday and Friday look gloomy with the potential for what they mentioned above at an 80-100% Chance, depending where you exactly live. So believe it, this time...because it is A Likely probability according to all global weather model forecasts. - NYC Meteorologist here. Now calling this past Winter in the northeast can certainly be justified. Lol
Grant McGuire · Top Commenter · Western Connecticut State UniversityAfter an awful winter. people are tired of mild days, cool nights, low humidity, Canadian air, excessive rain. Maybe if you lived in a northern suburb, where the temperature plummets 30-40 degrees every night and we run our heating systems until mid-June, you'd understand how much a "normal" spring sucks. I envy the people out west.
- Grant McGuire · Top Commenter · Western Connecticut State University
- Grant McGuire · Top Commenter · Western Connecticut State University
- Brian Patterson · Follow · Top Commenter · Bronx, New YorkWell I can admit that there haven't been many days where we were above average temps compared to below average that is for sure for this Spring and definitely the past winter. In NYC since March 1st we are only over 2 inches above average in precipitation, which isn't that bad. I don't care for drenching and flooding rainfall, but at least it is beneficial for those suffering from pollen allergies.
- Grant McGuire · Top Commenter · Western Connecticut State University
- Grant McGuire · Top Commenter · Western Connecticut State UniversityFunny how we get the tropical moisture, but not the tropical temperatures.
- Brian Patterson · Follow · Top Commenter · Bronx, New YorkI apologize, I meant to say calling this last Winter crazy*** can be justified.
Peter Kane · Top CommenterThe Fun Day at my school better not be rained out on Friday in Philadelphia.- Peter Kane · Top Commenter
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