The watch has been issued for the potential of fast-acting flooding. A flash flood can occur in less than an hour, leaving little time to react. If a flash flood is imminent, then a flash flood warning will be issued.
Already, this month is the fourth wettest June on record. So far, we’re received 8.87 inches. The normal June rainfall is 3.23 inches.
The high rainfall has saturated the ground and swollen rivers and streams.
On top of this the NWS says “there is a chance that thunderstorms that develop could be strong to severe.”
So why is this happening?
“Low pressure will approach from the west today then move north tonight and Friday,” the NWS says. “Heavy showers and thunderstorms will become increasingly likely this afternoon into tonight as the system interacts with a moist unstable air mass over the area. This activity will continue into Friday.
“This setup is conducive to bands of heavy rain showers and thunderstorms training over the same area. Localized rainfall rates could exceed 2 inches an hour if thunderstorms train over the same area for an hour, which which would cause urban and small stream flash flooding.
The first rain started falling shortly after 7:30 a.m. in southwestern Connecticut.
You can watch Doppler radar to keep track of the precipitation.
Here’s the updated forecast for southwest Connecticut:
Today: A chance of showers and thunderstorms. Some of the storms could produce gusty winds and heavy rain. Mostly cloudy, with a high near 82. South wind around 8 mph. Chance of precipitation is 40%.
Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2am. Some of the storms could produce heavy rain. Low around 66. Southeast wind 6 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Friday: Showers and thunderstorms likely. Some of the storms could produce heavy rain. Mostly cloudy, with a high near 80. South wind 8 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Friday night: Showers and thunderstorms likely, mainly after 2am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 64. South wind 3 to 7 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Weather junkies can find a much longer forecast discussion here.
East winds will be blowing at 5 knots, becoming south around 10 knots in the afternoon. Seas will be 1 foot of less.
Tides: High tide around 3:15 p.m.; low tide around 9:30 p.m.
Water temperature: 72 degrees.
Air quality: Good.
Pollen count: 1.8 low.
Sunset: 8:29 a.m.
High temperatures on Wednesday:
Bridgeport, New Haven and Hartford hit 85 degrees.
Danbury reached 80 degrees.