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View Full Version : Aug.10, 2011 - severe thunderstorm goes through St. Catharines


DarkSky
08-10-2011, 01:45 AM
12:50am, woke me up. One of the few nights I managed to get to sleep early.

*Intense* thunder and lightning, torrential rain, very gusty wind, hail mixed in with rain.

Easily the most intense storm we've had this year. Most intense part only lasted about 10 mins. Storm itself lasted about 20-25mins (finally passed over now - 1:12am with the odd flash from the distance still lighting up the room).

I would have loved to have seen this one in the daylight. Not much to see looking out the windows in the dark of night, illuminated only by streetlights and lightning flashes.

http://img97.imageshack.us/img97/1374/0105bufloop.gif

The cell below is the one NNW of the letter 'B' in Buffalo :

http://img703.imageshack.us/img703/5080/0104radar.jpg

No warning issued, but to their credit EC did have St. Catharines under a watch, but mistakenly DROPPED the watch at 11:44PM long before the cell was near St. Catharines :


184
WWCN11 CWTO 100241
SEVERE WEATHER BULLETIN
ISSUED BY ENVIRONMENT CANADA
AT 10:41 PM EDT TUESDAY 9 AUGUST 2011.
---------------------------------------------------------------------
WATCHES/WARNINGS IN EFFECT FOR SOUTHERN ONTARIO...

SEVERE THUNDERSTORM WATCH FOR:
=NEW= DUNNVILLE - CALEDONIA - HALDIMAND
=NEW= BRANTFORD - COUNTY OF BRANT
=NEW= ST. CATHARINES - GRIMSBY - NORTHERN NIAGARA REGION
=NEW= CITY OF HAMILTON
=NEW= GUELPH - ERIN - SOUTHERN WELLINGTON COUNTY
WOODSTOCK - TILLSONBURG - OXFORD COUNTY
KITCHENER - CAMBRIDGE - REGION OF WATERLOO.

SLIGHT RISK OF THUNDERSTORMS APPROACHING SEVERE LIMITS.

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.

---------------------------------------------------------------------
WATCHES/WARNINGS ENDED FOR SOUTHERN ONTARIO...

SEVERE THUNDERSTORM WATCH ENDED FOR:
LONDON - PARKHILL - EASTERN MIDDLESEX COUNTY
HURON - PERTH
MOUNT FOREST - ARTHUR - NORTHERN WELLINGTON COUNTY
GREY - BRUCE.

---------------------------------------------------------------------
==DISCUSSION==
AT 10:35 PM EDT WEATHER RADAR AND LIGHTNING DETECTOR INDICATED A
CLUSTER OF INTENSE THUNDERSTORMS SOUTHWEST OF KITCHENER WITH A
POTENTIAL OF BECOMING SEVERE. THE MAIN THREATS WITH THIS
THUNDERSTORM ARE DAMAGING WIND GUSTS, HEAVY DOWNPOURS AND LARGE HAIL.
THESE STORMS ARE MOVING EAST AT 50 KM/H.

=REFER TO YOUR LOCAL PUBLIC FORECAST FOR FURTHER DETAILS.

END/OSPC

Nagii
08-10-2011, 03:45 AM
It was a meh for me. Power flickered once, some thunder, little rain. Lasted about 20-30mins...maybe even less.

Wait you live like 10mins from my house Dark, how did you get hail mixed with rain and gusty wind?

JohnCyr
08-10-2011, 06:53 AM
hahahhahahahaha

obwan
08-10-2011, 07:17 AM
In Thorold, we had no rain just some scud moving past. We did have a good light show both north and south. The storm to the south appeared to be more intense as far as lightning goes..

DarkSky
08-10-2011, 09:32 AM
The cell traveled with it's center right on the shoreline. So make 5kms north (on the lake) and 5km south. So if you lived towards downtown, and especially the south end, you wouldn't have been under the core.


000
AWCN11 CWTO 100648
UPDATED WEATHER SUMMARY FOR ALL OF SOUTHERN ONTARIO AND THE
NATIONAL CAPITAL REGION ISSUED BY ENVIRONMENT CANADA
AT 2:07 AM EDT WEDNESDAY 10 AUGUST 2011.

-------------------------------------------------------------
==WEATHER EVENT DISCUSSION==

AN AREA OF RAIN WITH A FEW THUNDERSTORMS MOVED ACROSS SOUTHERN
ONTARIO TUESDAY MORNING INTO THE EVENING HOURS. THERE WAS
SIGNIFICANT RAINFALL AND LOCALLY HIGH AMOUNTS REPORTED BY
ENVIRONMENT CANADA WEATHER STATIONS AND VOLUNTEER CLIMATE OBSERVERES.

FOLLOWING ARE SOME OF THE REPORTS OF TOTAL RAINFALL RECEIVED BY
ENVIRONMENT CANADA AS OF 8 PM TUESDAY.

-------------------------------------------------------------
LOCATION RAINFALL AMOUNTS (MILLIMETRES)

HAMILTON 47.4
LONDON 44.9
DORCHESTER 41.5
NEW GLASGOW 38.0
WINDSOR 34.8
ST. THOMAS 33.3
TORONTO EAST 32.8
OSHAWA 32.2
GRIMSBY MNT. 29.8
BROCKVILLE 29.1


THIS WEATHER SUMMARY CONTAINS PRELIMINARY INFORMATION
AND MAY NOT CONSTITUTE AN OFFICIAL OR FINAL REPORT.

END/OSPC