MADISON’S CURRENT WEATHER

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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

Surface Weather Map from Today with Isobars & Fronts

Current Temperatures (oF) & Isotherms

Current Dewpoints (oF)

Current Winds Aloft at 34,000 Ft.

Tomorrow’s 7AM Forecast

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 Cyclone See Fig. 11 Life Cycle of an Extratropical Cyclone See Fig. 11.9 Moran & Morgan (1997)

Incipient Cyclone Stage in the Life Cycle of an Extratropical Cyclone See Fig. 11.9A Moran & Morgan (1997)

The Surface Low & the Jet

Linkage between surface weather systems & winds aloft See Fig. 10 Linkage between surface weather systems & winds aloft See Fig. 10.22 Moran & Morgan (1997)

Wave Cyclone Stage in the Life Cycle of an Extratropical Cyclone See Fig. 11.9B Moran & Morgan (1997)

Occluding Stage in the Life Cycle of an Extratropical Cyclone See Fig Occluding Stage in the Life Cycle of an Extratropical Cyclone See Fig. 11.9C Moran & Morgan (1997)

Bent-Back Occlusion Stage in the Life Cycle of an Extratropical Cyclone See Fig. 11.9D Moran & Morgan (1997)

Cyclone Families from TIROS

Occluded Cyclone over British Isles

E. MOVEMENTS OF EXTRATROPICAL WAVE CYCLONES General Movements Steering winds aloft

Zonal Circulation Regime Figure 10.10 Moran & Morgan (1997)

Meridional Circulation Regime Figure 10.10 Moran & Morgan (1997)

Stagnant Circulation Regime with Cut-off Lows & Blocking Highs Figure 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 Cyclogenesis See 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

Storm Tracks see Fig. 11.16 of Moran & Morgan (1997)

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 side see Fig. 11 Weather along Storm Tracks (A) Warm Side vs. (B) Cold side see Fig. 11.15 of Moran & Morgan (1997)

Windy, warm & rainy in Madison 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 Cyclone See Fig. 11.9A Moran & Morgan (1997)

Wave Cyclone Stage in the Life Cycle of an Extratropical Cyclone See Fig. 11.9B Moran & Morgan (1997)

Occluding Stage in the Life Cycle of an Extratropical Cyclone See Fig Occluding Stage in the Life Cycle of an Extratropical Cyclone See Fig. 11.9C Moran & Morgan (1997)

Bent-Back Occlusion Stage in the Life Cycle of an Extratropical Cyclone See Fig. 11.9D Moran & Morgan (1997)

Winter Weather Conditions 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

See Figure 11.14 Moran & Morgan (1997)

Winter weather condition lasting 3 hours or more with: 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.

Cyclones along the Polar Front http://www.geog.ouc.bc.ca/conted/onlinecourses/geog_111/5s.html

Cross Section thru a cyclone http://www.geog.ouc.bc.ca/conted/onlinecourses/geog_111/5s.html

An extratropical cyclone http://www.geog.ouc.bc.ca/conted/onlinecourses/geog_111/5s.html

Typical cyclone tracks http://www.geog.ouc.bc.ca/conted/onlinecourses/geog_111/5s.html