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Hydrometeorological Discussion
Issued by NWS Northeast RFC

000
AGUS71 KTAR 221647
HMDTAR
HYDROMETEOROLOGICAL DISCUSSION
NATIONAL WEATHER SERVICE
NORTHEAST RIVER FORECAST CENTER...TAUNTON...MA
1245 PM EDT WED MAY 22 2013

HYDROMETEOROLOGICAL DISCUSSION:
:
EARLY WEDNESDAY MORNING A BACK DOOR COLD FRONT WAS LOCATED NEAR
NEW YORK CITY NORTHWARD THROUGH THE HUDSON VALLEY.  AS THIS FRONT
MOVED SOUTHWARD DURING TUESDAY IT TRIGGERED NUMEROUS THUNDERSTORMS
WITH SOME OF THEM PRODUCING DAMAGING WIND AND LARGE HAIL.  DURING
TODAY THE FRONT IS EXPECTED LIFT BACK TO THE NORTH ALLOWING WARM
AND HUMID AIR TO RETURN TO MUCH OF NEW ENGLAND EXCEPT FOR MAINE.
WITH THE RETURN OF THE WARM AND HUMID AIRMASS THE ATMOSPHERE WILL
ONCE AGAIN BECOME VERY UNSTABLE DURING THE AFTERNOON.  SHOWERS AND
THUNDERSTORMS WILL BECOME NUMEROUS AGAIN...WITH THE POTENTIAL FOR
SOME TO PRODUCE DAMAGING WINDS AND LARGE HAIL.  IN ADDITION THE
ATMOSPHERE IS VERY MOIST SO SOME OF THE STORMS WILL PRODUCE
LOCALLY VERY HEAVY RAIN.
:
AS WE HEAD INTO FRIDAY A STRONG COLD FRONT WILL VERY SLOWLY
APPROACH FROM THE WEST.  SHOWERS AND THUNDERSTORMS WILL BE ALIGNED
AHEAD OF THE FRONT AND WILL MARCH VERY SLOWLY EASTWARD THROUGH
FRIDAY. ONCE THE FRONT APPROACHES THE COAST ON FRIDAY AND SATURDAY
A LOW PRESSURE SYSTEM MAY DEVELOP ALONG THE NEW ENGLAND COAST TO
KEEP SHOWERS OR EVEN A STEADY RAIN OVER EASTERN SECTIONS OF THE
NERFC SERVICE AREA.
:
HYDROLOGIC DISCUSSION:
:
THE THUNDERSTORMS THAT DEVELOPED AND MOVED ACROSS THE REGION
TUESDAY AFTERNOON AND NIGHT PRODUCED LOCALLY HEAVY RAIN AS WELL AS
DAMAGING WINDS AND HAIL. MINOR RIVER FLOODING WAS REPORTED ON THE
WALLOOMSAC RIVER AT BENNINGTON, VT. RISES ABOVE ACTION BUT BELOW
FLOOD STAGE WERE NOTED ON THE NEARBY HOOSIC RIVER AS WELL. SEVERAL
OTHER LOCATIONS SAW SHARP...BUT MINOR RISES.
:
THE UNSETTLED WEATHER PATTERN OVER THE REGION WILL PRODUCE SHOWERS
AND THUNDERSTORMS FOR THE REST OF THE WORK WEEK. SOME OF THE
STORMS WILL PRODUCE LOCALLY HEAVY RAIN. RIVER FLOODING IS NOT
CURRENTLY FORECAST...BUT RISES TO NEAR FLOOD STAGE COULD BE
OBSERVED IN AREAS THAT RECEIVE LOCALLY HEAVY RAIN.
:
THE RISES SEEN ON AREA RIVERS HAVE RETURNED FLOWS TO NEAR SEASONAL
NORMAL LEVELS ACROSS CENTRAL NEW YORK AND NORTHERN NEW ENGLAND.
FLOWS IN NORTHERN AND SOUTHERN NEW YORK...SOUTHERN NEW ENGLAND...
AND EXTREME NORTHERN MAINE ARE STILL BELOW TO MUCH BELOW SEASONAL
NORMAL LEVELS. COMPARISONS OF CURRENT TO HISTORICAL STREAMFLOW
LEVELS CAN BE FOUND AT HTTP://WATERWATCH.USGS.GOV.
:
FLOOD OUTLOOK DISCUSSION:
:
THE NERFC FLOOD POTENTIAL OUTLOOK GRAPHIC INDICATES NO SIGNIFICANT
RIVER FLOODING IS LIKELY FOR THE RIVERS IN NEW ENGLAND AND NEW
YORK FOR THE NEXT FIVE DAYS.  THE FLOOD OUTLOOK GRAPHIC IS
AVAILABLE ON THE WEB AT:
:
HTTP://WWW.WEATHER.GOV/NERFC/FOP.SHTML
:
ADDITIONAL WATER AND WEATHER RELATED INFORMATION CAN BE FOUND ON
THE NWS/NERFC HOME PAGE AT http://www.nws.noaa.gov/er/nerfc
:
$$
:
HYDROMETEOROLOGICAL DISCUSSION:          STEVE NOGUEIRA
HYDROLOGIC DISCUSSION:                   JEFF OUELLET