802
NOUS41 KPBZ 071242
PNSPBZ
OHZ039-040-048>050-057>059-PAZ014-020>022-029-031-073>078-
WVZ001>004-080045-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
742 AM EST FRI NOV 7 2025
..APRIL 29TH STORM OFFICIALLY CALLED A DERECHO
THE STORM PREDICTION CENTER HAS OFFICIALLY DECLARED THE APRIL
29TH STORM THAT WENT THROUGH PARTS OF EASTERN OHIO, NORTHERN WEST
VIRGINIA, AND WESTERN PENNSYLVANIA A DERECHO.
A DERECHO (PRONOUNCED SIMILAR TO DEH-REY-CHO IN ENGLISH) IS A
WIDESPREAD, SEVERE WINDSTORM THAT ORIGINATES FROM A MID- LATITUDE
THUNDERSTORM COMPLEX CALLED A MESOSCALE CONVECTIVE SYSTEM THAT IS
DRIVEN BY A COLD POOL AND OTHER POSSIBLE INTERNAL FORCING MECHANISMS.
ALTHOUGH A DERECHO CAN PRODUCE DESTRUCTION SIMILAR TO THAT OF A
TORNADO, THE DAMAGE TYPICALLY OCCURS IN ONE DIRECTION ALONG A
RELATIVELY STRAIGHT PATH. AS A RESULT, THE TERM STRAIGHT-LINE WIND
DAMAGE IS SOMETIMES USED TO DESCRIBE DERECHO DAMAGE. BY
DEFINITION, IF THE SWATH OF WIND DAMAGE EXTENDS AT LEAST 250 MILES
(ABOUT 400 KILOMETERS) LONG, INCLUDES WIND GUSTS OF AT LEAST 58
MPH (93 KM/H) ALONG ITS LENGTH, WITH SEVERAL, WELL-SEPARATED 75
MPH (121 KM/H) OR GREATER GUSTS, AND ORIGINATES FROM A
THUNDERSTORM COMPLEX THAT MOVES FASTER THAN THE MEAN WIND SPEED
(THUS BEING PRIMARILY COLD POOL DRIVEN), THE EVENT MAY BE
CLASSIFIED AS A DERECHO.
MORE INFORMATION CAN BE FOUND HERE:
HTTPS://WWW.SPC.NOAA.GOV/MISC/ABTDERECHOS/DERECHOFACTS.HTM
MCMULLEN
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page