An Historical Analysis of Transient Rain Bearing Systems in the NAME Domain:
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An Historical Analysis of Transient Rain Bearing Systems in the NAME Domain: The Impact of Inverted Troughs on Monsoon Rainfall . Art Douglas and Phil Englehart Creighton University. Research Objectives.

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Art Douglas and Phil Englehart Creighton University

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Art douglas and phil englehart creighton university

An Historical Analysis of Transient Rain Bearing Systems in the NAME Domain:The Impact of Inverted Troughs on Monsoon Rainfall

Art Douglas and Phil Englehart

Creighton University


Research objectives

Research Objectives

  • 1. To develop an historical climatology of transient synoptic systems in northern Mexico.

  • 2. To determine relationships between these transient systems and fluctuations in summer rainfall.

  • 3. To relate variability in the frequency of transient systems to large scale oceanic and atmospheric anomalies.

  • 4. To provide a benchmark for modeling studies in order to determine model performance relative to the prediction of these transient features and their associated rainfall.


Transient synoptic features affecting northern mexico

Transient Synoptic Features Affecting Northern Mexico

  • 1. Tropical Cyclones (Published).

  • 2. Inverted Troughs: Cold and Warm.

  • 3. Cold Fronts.

  • 4. Cutoff Lows.

  • 5. Open Troughs.


Transient synoptic features affecting northern mexico1

Transient Synoptic Features Affecting Northern Mexico

  • 1. Tropical Cyclones (Published).

  • 2. Inverted Troughs: Cold and Warm.

  • 3. Cold Fronts.

  • 4. Cutoff Lows.

  • 5. Open Troughs.


Noaa nws library

NOAA NWS LIBRARY


Meridional wind time section 8 july to 12 august 2005

Meridional Wind Time Section8 July to 12 August 2005


Meridional wind time section july 1973

Meridional Wind Time SectionJuly 1973


Art douglas and phil englehart creighton university

Average Daily Rainfall (mm)

Inverted Trough Days

vs.

Days with No Synoptic Feature

Increase in Daily Rainfall (%)

Inverted Trough Days

with respect to

Days with No Synoptic Feature


Art douglas and phil englehart creighton university

Inverted Troughs Contribution to Seasonal (June-Sept) Rainfall (1967-2001)

Average Rainfall (mm)

Percent Contribution to Seasonal Total


Art douglas and phil englehart creighton university

RAINFALL Associated with INVERTED TROUGHS as a function of TROUGH POSITION (i.e. Displacement East (-) or West (+) of the Division Location in º Long.)

SONORA/SINALOA DURANGO TAMAULIPAS/NUEVO LEON


Art douglas and phil englehart creighton university

CONTRIBUTION OF INVERTED TROUGHS TO SEASONAL TOTAL RAINFALL

2004/CLIMO


Transient synoptic features affecting northern mexico2

Transient Synoptic Features Affecting Northern Mexico

  • 1. Tropical Cyclones (Published).

  • 2. Inverted Troughs: Cold and Warm.

  • 3. Cold Fronts.

  • 4. Cutoff Lows.

  • 5. Open Troughs.


Vis 16z october 7 2005

VIS 16Z October 7, 2005


Total rainfall october 2 7 2005

Total Rainfall October 2-7, 2005


Art douglas and phil englehart creighton university

TAMAULIPAS/NUEVO LEON (DIVISION 7)

Percentage of Total Seasonal Rainfall Associated with Fronts (< 350 km)


Summary and conclusions

Summary and Conclusions

1. A 35 year climatology of transient synoptic features indicates that NAME 2004 was characterized by:

a. Cold Front Days 200% of normal.

b. Inverted Trough Days 70% of normal.

c. Cutoff Low Days 90% of normal.

d. Open Trough Days 170% of normal.

2. Inverted troughs provide 20%-25% of the summer rainfall received in NC and NE Mexico.


Art douglas and phil englehart creighton university

3. Rainfall with IV troughs peaks when the system is overhead in NC Mexico. Rainfall peaks in Western Mexico when the IV system is 3° to 4° upstream: associated with MCS development ahead of IV troughs (downslope, weak capping).

4. IV Rainfall in NE Mexico peaks when the system is 4° upstream and this may be related to disruption of the normal divergent trade system in the western Gulf of Mexico

5. In NE Mexico cold fronts provide about 6% of the normal summer rainfall (June to September).


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