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Apr_20_2010_SPC_mcs_compass - greater from a volume of...

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SPC Graphics http://www.spc.noaa.gov
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Watches: Conditions are “Favorable” Conditions:       Surface Moisture- Look at sfc. Td map for Td>60F        Lifting Mechanism- Look at sfc. Analysis maps for  fronts       Unstable Atmos.- Look at sounding (CAPE and LI)       Wind Shear- Look at sounding (change in speed and  dir) Warm Moist Air
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1925 Tri-state Tornado June 7, 2007 Watches are county based Large watch boxes are for aviation purposes
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Warnings: A storm is warned if  one  of the following happens: 1. A storm spotter or official reports hail or a tornado. 2. An ASOS station or Doppler radar records winds in  excess of 50kts within a t-storm. 3. Doppler radar “sees” strong rotation in a t-storm. 4. Doppler radar measures reflectivity of 55dBZ or 
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Unformatted text preview: greater from a volume of radar sweeps. 2101 9 E MOSINEE MARATHON WI 4478 8951 HOUSE LEVELED, TREE DAMAGE. TORNADO ON THE GROUND. TIME APPROX. TORNADO STILL ON GROUND AT 407 PM. (GRB) 20,000-30,000 reports of severe weather each year Mesoscale Convective System: Defining Characteristics 50-500+ miles long, can last for several hours and track 100s of miles Responsible for the majority of the summer rainfall in the central US Major Features: Leading edge = gust front and shelf cloud Bow echo = section of high radar reflectivity (intense storms) that “bow” outward Training Stratiform Region = light to moderate rain that follows the intense leading edge Severe Threat: strong straight line winds Shelf cloud MCS – Mesoscale Convective System – Severe Aspect...
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