Skip Navigation Links 
NOAA logo-Select to go to the NOAA homepage NOAA's National Weather Service   Select to go to the NWS homepage
Storm Prediction Center
navigation bar left  
  navigation bar end cap is the U.S. Government's official Web portal to all Federal, state and local government Web resources and services.

Mesoscale Discussion 117
< Previous MD         Next MD >
MD 117 graphic

   Mesoscale Discussion 0117
   NWS Storm Prediction Center Norman OK
   0202 PM CST Sun Jan 22 2017

   Areas affected...Portions of north FL and south GA

   Concerning...Tornado Watch 21...

   Valid 222002Z - 222100Z

   The severe weather threat for Tornado Watch 21 continues.

   SUMMARY...The onset of a dangerous tornado outbreak is ongoing. A
   line of potentially tornadic supercells is spreading eastward around
   45-50 kt. Long-track, fast-moving, strong tornadoes will be

   DISCUSSION...A line of discrete/semi-discrete supercells extending
   from far southwest GA to central/eastern portions of the FL
   Panhandle will continue spreading eastward around 45-50 kt.
   Approximate times of arrival of this line are depicted in the
   accompanying graphical product. Storm-relative motion from radar
   suggests tightening/strengthening low-level mesocyclones with this
   activity. This activity now lies east of a front that arcs northward
   to surface low pressure over central AL featuring a deepening rate
   of over 1 mb per hour. Preceding pressure falls of 7-9 mb per 2
   hours have been noted, with open-warm-sector pressure falls of 3-6
   mb per 2 hours. As a plume of high theta-e air continues to stream
   northward to a warm front advancing north across south GA (serving
   as convective inflow), and very strong low-level SRH (around 550
   m2/s2 in the lowest 1 km above ground per Tallahassee VAD wind
   profile) continues given the strong surface cyclogenesis, the
   potential for significant, long-track, fast-moving tornadoes will

   ..Cohen.. 01/22/2017


   LAT...LON   31558464 32018406 31958312 31148294 29988310 29708361
               29668433 30018477 31558464 

Top/All Mesoscale Discussions/Forecast Products/Home
Weather Topics:
Watches, Mesoscale Discussions, Outlooks, Fire Weather, All Products, Contact Us

NOAA / National Weather Service
National Centers for Environmental Prediction
Storm Prediction Center
120 David L. Boren Blvd.
Norman, OK 73072 U.S.A.
Page last modified: January 22, 2017
Information Quality
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities