Storm-Relative Hodograph Nowcast

Now

(A thorough explanation of storm-relative hodographs can be found here!)

*Image may not be current! (Floater domain updates hourly only when activity anticipated)

Arrows: Approximate storm track over 1 hour (*calculated from operational SharpPy method for Bunkers’ right motion).

  • Arrow motion along/into/out of hodograph has direct implications on spotting strategy

Range Rings: 20kt and 40kt storm-relative wind

 

Pink: 0-1km – governs the strength of a supercell’s low-level mesocyclone

  • Especially large curved or sickle-shaped segments favorable for tornadoes, with surface storm-relative inflow > 40kt becoming more favorable for longer-tracked tornadoes

Red: 1-3km – governs the strength of a supercell’s mid-level mesocyclone

  • Especially long segments favorable for robust supercell formation, with straighter segments becoming more favorable for storm splitting

Green: 3-6km – may govern precipitation ventilation especially within the foward flank “vault” region

  • Especially segments lying outside the 15kt range ring may be more favorable for clean “vault” regions, with curved segments at constant storm-relative wind becoming more favorable for deep “mothership” structures

Yellow: 6-8km – may govern precipitation ventilation especially within the rear-flank downdraft region

  • Especially segments lying outside the 40kt range ring may be more favorable for “low-precipitation” mode (segments lying inside the 20kt range ring may be more favorable for “high-precipitation” mode), with longer, straighter segments radial to storm motion becoming more favorable for “tilted”, backsheared anvil-less structures

 


Forecast

*1800z-1700z (scroll to find time of interest)

*Run infrequently and variably

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