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Local Time: Mar 26 2017, 10:54 AM
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23 Feb 2017
Looks like we might get our 1st set of Severe Thunderstorms Friday evening in Southwestern Ontario.. Best risk area seems to be London, Sarnia and Windsor being the most likely.
Severe thunderstorms are forecast to affect portions of the southern
Great Lakes, Ohio Valley, and Tennessee on Friday and Friday night.
Damaging winds, tornadoes, and large hail are possible.
A mid-level trough/low is forecast to move from the middle MO Valley
eastward to the central Great Lakes and OH Valley. Concurrently, a
belt of strong and cyclonically curved 500-mb flow is forecast to
intensify to 100+ kt over the OH Valley late Friday night. A
surface low near the MO/IA border will develop northeastward to
southern Lake Michigan by early evening before partially occluding
over northern Michigan by early Saturday. A northward-advancing
warm front will move from north-central IL and Michiana through
southern Lower Michigan by mid-late afternoon. A cold front near
the MS River around midday Friday will sweep eastward across the OH
and TN Valleys by daybreak Saturday.
...southern Great Lakes and Ohio Valley...
The northeastward advection of an elevated mixed layer and
associated steep to very steep 700-500 mb lapse rates (7-8.5 degrees
per km) from the south-central states will overspread this region
during the morning. A capping inversion will likely limit
showers/thunderstorms to be near the advancing warm frontal zone
during the morning with mid-upper 50s dewpoints amidst strong
southerly low-level flow. By early to mid-afternoon, NAM model
guidance indicates temperatures will warm well into the 60s across
much of the warm sector compared to the much cooler GFS. The
increasing influence of DCVA/500-mb height falls coupled with
heating will likely lead to thunderstorms developing into one or
more broken bands. Strong effective shear (45-60 kt) coupled with
MLCAPE increasing into the 250-1250 J/kg range will support strong
to severe thunderstorms. Forecast soundings show moist boundary
layers with effective SRH in the 150-200 m2/s2 range over much of
the warm sector but locally higher (200-300 m2/s2) over the northern
portion of the Enhanced Risk in the Michiana/southern Lower Michigan
vicinity. A mixed mode of both linear and cellular (some of which
maturing into supercells) is expected during the early half of the
convective life cycle. The threats from the more intense storms
include damaging winds, large hail, and the possibility for
tornadoes. Upscale growth will likely occur during the
evening/overnight as storms move eastward across the OH Valley and
the severe risk transitions to primarily damaging winds as
southwesterly 700-mb flow strengthens to 60-kt.
1 Mar 2015
Just thought you guys could check this out if you wanted got my new server up... With a great view looking at London's Downtown core from the South.. More to come soon..
Here is the link or click on my Signature..
1420450315_Weather_London_Ontario_Canada_London.jpg ( 115.36K ) Number of downloads: 8
2 Aug 2013
Watches up for Southwestern Ontario. looks like some good cells moving over lake Huron in a bit.
Severe thunderstorm watch for
London - Parkhill - Eastern Middlesex County issued
Risk of severe thunderstorms this afternoon and evening.
Scattered thunderstorms are expected to develop over the above regions this afternoon. Some of these storms will have the potential to become severe with damaging winds, large hail, and torrential downpours. The threat for severe storms will end by mid-evening.
This is an alert to the potential development of severe thunderstorms with large hail, damaging winds or heavy rainfall..Monitor weather conditions and listen for updated bulletins.
son.png ( 35.48K ) Number of downloads: 0
22 May 2016 - 21:20
3 Jan 2015 - 20:20
8 Nov 2014 - 10:26
13 May 2014 - 21:54
9 Jul 2013 - 0:24
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