Understanding Extratropical Cyclones: Weather Systems Exploration
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Explore the features, life cycle, and movements of extratropical cyclones with detailed figures and explanations. Learn about winter storms, blizzards, and public safety precautions for extreme weather events.
Understanding Extratropical Cyclones: Weather Systems Exploration
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Presentation Transcript
MADISON’S CURRENT WEATHER Madison Weather at 1000 AM CDT TUE AUG 7 2001 Updated twice an hour at :05 and :25 Sky/Weather: SUNNY Temperature: 85 F (29 C) Dew Point: 76 F (24 C) Relative Humidity: 74% Wind: VRB7 MPH Barometer: 30.13F
ATM OCN 100 - Spring 2002 LECTURE 25 (con’t.) MID-LATITUDE WEATHER SYSTEMS:PART II: THE EXTRATROPICAL CYCLONE • Introduction • The Norwegian Model of Extratropical Cyclones • Observed Weather Features surrounding Extratropical Cyclones • Life Cycle of an Extratropical Cyclone
Life Cycle of an Extratropical CycloneSee Fig. 11.9 Moran & Morgan (1997)
Incipient Cyclone Stage in the Life Cycle of an Extratropical CycloneSee Fig. 11.9A Moran & Morgan (1997)
Linkage between surface weather systems & winds aloftSee Fig. 10.22 Moran & Morgan (1997)
Wave Cyclone Stage in the Life Cycle of an Extratropical CycloneSee Fig. 11.9B Moran & Morgan (1997)
Occluding Stage in the Life Cycle of an Extratropical CycloneSee Fig. 11.9C Moran & Morgan (1997)
Bent-Back Occlusion Stage in the Life Cycle of an Extratropical CycloneSee Fig. 11.9D Moran & Morgan (1997)
E. MOVEMENTS OF EXTRATROPICAL WAVE CYCLONES • General Movements • Steering winds aloft
Meridional Circulation RegimeFigure 10.10 Moran & Morgan (1997)
Stagnant Circulation Regime with Cut-off Lows & Blocking HighsFigure 10.13 Moran & Morgan (1997)
E. MOVEMENTS OF EXTRATROPICAL WAVE CYCLONES (con’t.) • General Movements • Regions of Cyclogenesis • Lee-side of mountains • Along east coasts of continents
Lee-slope CyclogenesisSee Fig.1 pg. 275, Moran & Morgan (1997)
E. MOVEMENTS OF EXTRATROPICAL WAVE CYCLONES (con’t.) • General Movements • Regions of Cyclogenesis • Lee-side of mountains • Along east coasts of continents • Principal Cyclone Tracks over North America
E. MOVEMENTS OF EXTRATROPICAL WAVE CYCLONES (con’t.) • General Movements • Regions of Cyclogenesis • Principal Cyclone Tracks over North America • Time Sequences of Weather Events - Single Point Forecasting
Weather along Storm Tracks(A) Warm Side vs. (B) Cold sidesee Fig. 11.15 of Moran & Morgan (1997)
Weather on Warm Side Windy, warm & rainy in Madison
Weather on Cold Side Development of a 5 inch snow storm in Madison (with temperatures in the teens)
Incipient Cyclone Stage in the Life Cycle of an Extratropical CycloneSee Fig. 11.9A Moran & Morgan (1997)
Wave Cyclone Stage in the Life Cycle of an Extratropical CycloneSee Fig. 11.9B Moran & Morgan (1997)
Occluding Stage in the Life Cycle of an Extratropical CycloneSee Fig. 11.9C Moran & Morgan (1997)
Bent-Back Occlusion Stage in the Life Cycle of an Extratropical CycloneSee Fig. 11.9D Moran & Morgan (1997)
G. WINTER STORMS • Definitions • Winter Weather Conditions • Hazards of Winter Storms • HEAVY SNOW • ICE STORMS • STRONG WINDS • Ingredients of a Winter Storm • COLD AIR • MOISTURE • LIFT
WINTER STORMS (con’t.) • Blizzards • Winter weather condition lasting 3 hours or more with: • Strong winds (35 mph or more); • Snow & blowing snow with visibility less than 1/4 mile.
WINTER STORMS (con’t.) • Public Information Dissemination & Public Safety Precautions • Blizzard warnings; • Winter storm watches & warnings; • Ice storm warnings; • High wind warnings; • Wind chill warnings.
