What is a Strong Thunderstorm Advisory?

With the beginning of the new one inch hail severe thunderstorm criterion on April 1st, NWS Indianapolis now has a new product at its disposal to communicate the threat to the public and our partners of storms that are strong, but not quite severe.  Remember that severe thunderstorms are defined as any storm producing one inch hail or larger, winds to 58 mph (50 knots), or a tornado.  Strong storms are those thunderstorms which approach, but do not exceed, these limits.

For these strong, but not quite severe storms, a Special Weather Statement (SPS) product may be issued, headlined as a Strong Thunderstorm Advisory.  An example of this product is below.  These products will be issued as necessary, unless conditions dictate that all immediate focus be turned only to a large number of severe thunderstorms in the area.

For questions and more information, contact us at w-ind.webmaster@noaa.gov

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
659 PM EDT THU APR 2 2009

INZ064-065-071-072-022330-
BARTHOLOMEW-DECATUR-JACKSON-JENNINGS-
659 PM EDT THU APR 2 2009

...STRONG THUNDERSTORM ADVISORY FOR JENNINGS...NORTHEASTERN
JACKSON...SOUTHEASTERN BARTHOLOMEW AND SOUTHWESTERN DECATUR COUNTIES
UNTIL 730 PM EDT...

AT 657 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 9 MILES EAST OF SEYMOUR TO 8 MILES EAST OF
SEYMOUR...AND MOVING NORTH AT 35 MPH.

SMALL HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THESE STORMS.

* THESE STORMS WILL BE NEAR...
  HAYDEN AROUND 705 PM EDT...
  BUTLERVILLE AROUND 710 PM EDT...
  SCIPIO AROUND 715 PM EDT...
  AZALIA AROUND 720 PM EDT...

BE PREPARED TO TAKE SHELTER IN THE EVENT THESE STORMS INTENSIFY AND
BECOME SEVERE...OR A WARNING IS ISSUED BY THE NATIONAL WEATHER
SERVICE.

$$



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