Storm Prediction Center Severe Thunderstorm Watch 642

Note: 
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for Watch Status Reports.

   SEL2

   URGENT - IMMEDIATE BROADCAST REQUESTED
   Severe Thunderstorm Watch Number 642
   NWS Storm Prediction Center Norman OK
   925 AM EDT Wed Sep 2 2026

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     Central and South-Central Pennsylvania

   * Effective this Wednesday morning and afternoon from 925 AM
     until 200 PM EDT.

   * Primary threats include...
     Scattered damaging wind gusts to 70 mph likely
     Isolated large hail events to 1.5 inches in diameter possible

   SUMMARY...A small bowing cluster will likely continue moving quickly
   southeastward this morning and early afternoon while posing a threat
   for mainly scattered severe/damaging winds. Isolated hail may also
   occur with any stronger cores on the western flank of the cluster.

   The severe thunderstorm watch area is approximately along and 55
   statute miles east and west of a line from 25 miles north northwest
   of State College PA to 45 miles southwest of Harrisburg PA. For a
   complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU2).

   PRECAUTIONARY/PREPAREDNESS ACTIONS...

   REMEMBER...A Severe Thunderstorm Watch means conditions are
   favorable for severe thunderstorms in and close to the watch area.
   Persons in these areas should be on the lookout for threatening
   weather conditions and listen for later statements and possible
   warnings. Severe thunderstorms can and occasionally do produce
   tornadoes.

   &&

   AVIATION...A few severe thunderstorms with hail surface and aloft to
   1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
   few cumulonimbi with maximum tops to 550. Mean storm motion vector
   31040.

   ...Gleason

Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.

   SAW2 
   WW 642 SEVERE TSTM PA 021325Z - 021800Z
   AXIS..55 STATUTE MILES EAST AND WEST OF LINE..
   25NNW UNV/STATE COLLEGE PA/ - 45SW CXY/HARRISBURG PA/
   ..AVIATION COORDS.. 50NM E/W /16N PSB - 26NW EMI/
   HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
   MAX TOPS TO 550. MEAN STORM MOTION VECTOR 31040.

   LAT...LON 41187698 39757640 39757847 41187908

   THIS IS AN APPROXIMATION TO THE WATCH AREA.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
   FOR WOU2.

Watch 642 Status Report Message has not been issued yet.

Note:
 Click for Complete Product Text.

Tornadoes

Wind

Hail

Combined Severe Hail/Wind

For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The “Low” category contains probability values ranging from less than 2%
to 20% (EF2-EF5 tornadoes), less than 5% to 20% (all other probabilities),
“Moderate” from 30% to 60%, and “High” from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.