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Meteorology 415 EVENTS CB, Lightning and t-storms

Fall 2012. Meteorology 415 EVENTS CB, Lightning and t-storms. Cumulonimbus. Basics of Cb Visibility. Instability – present or develops Good viewing; no haze or obstructions Length of daylight Favored region for convection; convergence zones (sea-breeze fronts). Cb Basics.

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Meteorology 415 EVENTS CB, Lightning and t-storms

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  1. Fall 2012 Meteorology 415EVENTSCB, Lightning and t-storms

  2. Cumulonimbus

  3. Basics of Cb Visibility • Instability – present or develops • Good viewing; no haze or obstructions • Length of daylight • Favored region for convection; convergence zones (sea-breeze fronts)

  4. Cb Basics KDAB 071753Z 06007KT 10SM FEW025TCU BKN250 28/23 A2999 RMK AO2 SLP154 TCU VC NW DSNT NE E-SE S-W

  5. Thunderstorm Risk *Recall that thunder must be heard! *Beware of instrument sensor issues (TSNO) *Remember diurnal cycle to convection and seasonal cycles (equinoxes) *Expect CAPE >750 j/kg *Look for Td >= 45/50F (North) ; 55/60F (South) *Check for MOS T pops >25% *Examine the analysis for a convergence lines *Recall SPC Outlook for risk of t-storms

  6. Thunderstorm Event • KMLB 071853Z AUTO 07008KT 10SM CLR 29/23 A2994 RMK AO2 SLP139 T02940233 TSNO=

  7. Frequency of Thunderstorms

  8. Convergence Lines

  9. MOS Threshold POP

  10. Lightning • Simply double the risk of a thunderstorm!

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