3-4 August 2008 Hudson/Mohawk Convergence
(Click on any image to see larger image)
Hudson/Mohawk convergence is typically thought to occur
mostly during the cold season, often contributing to lingering snow and low
clouds within a 3 mile radius of
On 3-4 August 2008, Hudson/Mohawk Convergence occurred, that
supported a localized band of low clouds, showers and thunderstorms, which in
some cases affected the
Figure 1. Upper plots
Figure 2. Upper plots
Figure 3. Raobs at 1200 UTC 3 August from a) Albany, NY, b) Buffalo, NY and c) Manawaki, ON. Note the near saturation below 700 hPa in each sounding, and although relatively limited, surface-based instability exists.
Figure 4. Raobs at 1200 UTC 4 August from a) Albany, NY, b) Buffalo, NY and c) Manawaki, ON. Note the continued saturation below 700 hPa, but drying is gradually filtering in at mid and upper levels.
Figure 5. Raobs at 0000
UTC 4 August from a)
Figure 6. Surface
plots from a) MSAS 1800Z 3 August MSLP and wind barbs, and b) MSAS 1900Z 3
August MSLP and station plot. Note the
SW/NE-oriented isobars across eastern NY.
Also note the northeast winds along the NY/VT border, and NW winds over
central and southern NY into southern
Figure 7. Visible satellite imagery from a) 2145 UTC 3 August and b) 2145 UTC 4 August. Note the lines of convective cloudiness oriented NNW/SSE across eastern NY on the 2 successive days.
Figure 8. KENX loop of 0.5º base reflectivity in hourly increments from 2002Z through 2300Z 3 August. Note the showers and thunderstorms in NNW/SSE oriented lines training over roughly the same locations.
Figure 9. Regional 0.5º base reflectivity at a) 2200 UTC 4 August and b) 2257 UTC 4 August. Note the showers and thunderstorms in NNW/SSE oriented lines training over roughly the same locations for the second day.
Figure 10. METAR observations at Albany, NY airport from 1747Z through 2351Z 3 August. Note the thunderstorms reported and the brief IFR visibility from 2309Z to 2316Z. Rainfall of 0.12” was observed at the airport, but some locations within 5 miles of the airport received over 1.00” of rain.