Estimate Surface Low Pressure System Using Polar Jet Stream Core during winter

Abstract

Present paper investigated the relationship between polar jet stream core speed at 300 hPa level and the surface low pressure system. Winter seasons were studied during years from 2014 to 2016. February months were chosen from winter seasons which the polar jet stream passes with high frequencies over the area of study. The polar jet structure was almost continuous jet-type that the increasing in the jet core speed would decrease the pressure value in the low pressure system. the Pearson's (R) statistical test used to show the strength of that relationship which accessible values were between (83% strong and over strong) that presented the core speed values as a good element to derive equation connecting between the low pressure system value in (hPa) at surface and core speed value in (kt) at 300 hPa level . The simple linear regression technique is used to drive the equation that connects between the low pressure system and the jet core speed value which was [Low pressure center value (hPa) =1042.57 ̶ (0.307 × core speed (kt)]. The general fit equation was tested against some jet stream cases at 300 hPa that were the highest value of the jet core speed, the lowest and middle selected value which presented the percentage errors were between (0.03-0.09). the chart analyzing presented the lowest low pressure system center corresponded the highest the jet core speed values as shown in 11 Feb., 2015 at 00 UTC which the core speed was 150 (kt) corresponding the surface low pressure system which was 993 (hPa).