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< Day 3 Outlook    
Day 4-8 Severe Weather Outlook Issued on Apr 20, 2018
Updated: Fri Apr 20 08:47:03 UTC 2018
D4-8 D4 D5 D6 D7 D8
 Population  Cities  CWAs  Interstates  Counties  ARTCC  FEMA Regions

D4Mon, Apr 23, 2018 - Tue, Apr 24, 2018 D7Thu, Apr 26, 2018 - Fri, Apr 27, 2018
D5Tue, Apr 24, 2018 - Wed, Apr 25, 2018 D8Fri, Apr 27, 2018 - Sat, Apr 28, 2018
D6Wed, Apr 25, 2018 - Thu, Apr 26, 2018 (All days are valid from 12 UTC - 12 UTC the following day)
Note: A severe weather area depicted in the Day 4-8 period indicates 15%, 30% or higher probability for severe thunderstorms within 25 miles of any point.
PREDICTABILITY TOO LOW is used to indicate severe storms may be possible based on some model scenarios. However, the location or occurrence of severe storms are in doubt due to: 1) large differences in the deterministic model solutions, 2) large spread in the ensemble guidance, and/or 3) minimal run-to-run continuity.
POTENTIAL TOO LOW means the threat for a regional area of organized severe storms appears unlikely (i.e., less than 15%) for the forecast day.
 Forecast Discussion

   ZCZC SPCSWOD48 ALL
   ACUS48 KWNS 200845
   SPC AC 200845

   Day 4-8 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0345 AM CDT Fri Apr 20 2018

   Valid 231200Z - 281200Z

   ...DISCUSSION...
   Upper low over the Southeast states at the beginning of the extended
   period (12Z D4/Monday) is expected to slowly drift
   northward/northwestward on D4/Monday and D5/Tuesday before
   eventually becoming absorbed into a shortwave trough progressing
   eastward/southeastward from the Plains into the eastern CONUS on
   D6/Wednesday and D7/Thursday. More northerly trajectory of this
   shortwave trough coupled with only modest moisture return should
   mitigate the severe-weather potential through next week.

   ..Mosier.. 04/20/2018

   CLICK TO GET WUUS48 PTSD48 PRODUCT


To retrieve previous Day 4-8 convective outlooks, enter the date YYYYMMDD (e.g., 20050310 for March 10, 2005.)
Data available since March 8, 2005.
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Page last modified: April 20, 2018
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