NOUS41 KWBC
071125 CCA
PNSWSH
Service Change
Notice 12-29: Corrected
National Weather
Service Headquarters Washington DC
725 AM EDT Fri
Sep 7 2012
To: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather Information
Network
-NOAAPort
Other NWS partners and employees
From: Eli Jacks
Chief, Fire and Public Weather
Services Branch
Subject: Corrected: Transition of NWS Storm Prediction
Center
(SPC) Thunderstorm Outlook (CONUS
Only) from
Experimental to Operational Status
Effective
September 26, 2012
Corrected to
change the fourth issuance time of the day from
2030Z
to 2100Z.
Effective
Wednesday, September 26, 2012, at 1700 Coordinated
Universal Time
(UTC), the SPC Thunderstorm Outlook becomes
operational. This product is issued only for the CONUS.
The SPC
Thunderstorm Outlook depicts the expected geographic
areas of thunderstorms including 10, 40 and 70
percent
probabilities in 4 or 8 hour time periods. A 40 percent
probability means given similar environmental
conditions, a
thunderstorm would be observed at any one location (in
either a
county or city) within the 40 percent thunder
probability area
four times out of ten, or 40 percent of the time.
Forecasts of
thunderstorms are critical for the protection of
life and property since every thunderstorm
contains lightning
that is a potential killer. The high temporal and
spatial
resolution of the SPC Thunderstorm Outlook will aid
both NWS
forecasters and NWS partners in time-sensitive decisions
related
to thunderstorms and ultimately provide greater
safety for the
U.S.
public.
SPC Thunderstorm
Outlook issuance and valid times are:
Issue Time
(UTC) Valid Periods (UTC)
---------- -------------------
0600Z 1200-1600, 1600-2000, 2000-0000
1300Z 1600-2000, 2000-0000, 0000-0400
1700Z 2000-0000, 0000-0400, 0400-1200
2100Z 0000-0400, 0400-1200
0130Z 0400-1200
The SPC
Thunderstorm Outlooks web-based graphic is online at:
http://www.spc.noaa.gov/products/exper/enhtstm/
If you have any
questions, please contact:
John Ferree
NWS Severe Storms Services
Norman, OK
73072
405-325-2209
National Service
Change Notices are online at:
http://www.weather.gov/os/notif.htm
$$