ANASYG-PRESYG symbolism
A. Basic elements for the synoptic situation
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| D = D↓ D↑ | Localisation and evolution of the lows. |
| A = A↓ A↑ | Localisation and evolution of the highs. |
| B+ | Situation of the blocking type: high anomaly. |
| B- | Situation of the blocking type: low anomaly. |
| d | Heat lows. |
| δ | Orographic lows. |
| DHugo | Low originating from an ex-tropical cyclone. |
| DP | Polar lows. |
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Hurricanes. |
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Tropical storms. |
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Tropical depressions. |
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Low level jets. |
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Surface or very low levels convergence lines. |
B. Synoptic dynamics markers.
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Jet stream, upper troposphere maximum wind axis |
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Area of strong diffluence at the exit. |
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Area of strong confluence at the entrance. |
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Latent tropopause anomaly. |
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Dynamic tropopause anomaly. |
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Upper troposphere trough. |
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Moderate easterly waves (shallow, surface-1500 m). |
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Enhanced easterly waves (deep, surface-3000 m). |
C. The bad weather systems.
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The surface fronts, in "frontogenesis"
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Warm front. |
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Cold front. |
Active occluded fronts
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Occlusion. |
Split cold fronts or "Catafronts"
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A front at upper level (about 600 hPa). |
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Intersection of the front with the surface. |
Frontolysing fronts
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Warm front. |
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Cold front. |
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Almost stationary front. |
The pseudo-fronts
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Pseudo warm front. |
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Pseudo cold front. |
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Pseudo almost stationary. |
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Pseudo subsident front. |
D. Precipitating activity.
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Activity of the fronts.
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Weak precipitations. |
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Moderate precipitations . |
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Strong precipitations . |
Precipitating areas.
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Weak. |
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Moderate. |
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Strong. |
E. The areas of strong convection.
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Convective activity. |
In cold air.
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Strongly active depression rear. |
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Strongly subsident depression rear. |
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Convection organised in lines. |
In warm air.
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Strong convective instability area. |
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Squall lines. |
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Inter Tropical Convective Zone, active ITCZ. |
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Inter Tropical Convective Zone, ITCZ with no convective activity . |
F. Others.
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Sand advection. |