A NARROW BAND OF MOIST UNCONDITIONALLY UNSTABLE AIR JUST BEHIND THE FRONTTHE MOISTURE USUALLY EXTENDS TROUGH A DEEP LAYER (TO 300 MB)PWS 150-200% OR NORMALOROGRAPHIC LIFT PROVIDES MECHANISM TO RELEASE INSTABILITY

Times when the surface dewpoints extend westward to the front range should be monitored very closely

especially when the low-level winds are easterly or southeasterly

FROM CHAPPELL COMET NOTES

A NARROW BAND OF MOIST UNCONDITIONALLY UNSTABLE AIR JUST BEHIND THE FRONT THE MOISTURE USUALLY EXTENDS TROUGH A DEEP LAYER (TO 300 MB) PWS 150-200% OR NORMAL OROGRAPHIC LIFT PROVIDES MECHANISM TO RELEASE INSTABILITY