[nws-changes] 20120907: SPC thunderstorm outlook-Fwd: ADMIN NOTICE NOUS41 KWBC

• To: nws-changes@xxxxxxxxxxxxxxxx
• Subject: [nws-changes] 20120907: SPC thunderstorm outlook-Fwd: ADMIN NOTICE NOUS41 KWBC
• From: Linda Miller <lmiller@xxxxxxxxxxxxxxxx>
• Date: Fri, 07 Sep 2012 06:35:00 -0600

-------- Original Message --------

731
NOUS41 KWBC 071125
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
   john.t.ferree@xxxxxxxx
   405-325-2209

National Service Change Notices are online at:

http://www.weather.gov/os/notif.htm

$$