19Z Update
19Z Update
Surface:
Southern Plains
Central Plains
Northern Plains (not available at this update)
Upper Midwest
Midwest/Mid-Mississippi valley
Satellite:
National (unavailable)
Southern Plains
Central Plains
Northern Plains
Mid-Mississippi valley
Radar:
National
SPC mesoanalysis graphics available this hour:
0-3 km CAPE and sfc vorticity
Bulk Richardson Shear
1 km EHI
3 km EHI
Effective Shear
LFC heights
MESOSCALE DISCUSSION #2
NWS STORM PREDICTION CENTER NORMAN OK (
graphic)
AREAS AFFECTED...WRN NEB...SW SD
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
DEEPENING CONVECTIVE DEVELOPMENT EVIDENT IN LATEST VISIBLE IMAGERY
APPEARS TO BE OCCURRING IN ZONE OF ENHANCED LOW-LEVEL
CONVERGENCE/WARM ADVECTION TO THE NORTHEAST OF CENTRAL HIGH PLAINS
SURFACE CYCLONE. THIS IS ALSO ALONG AND JUST AHEAD OF SURFACE COLD
FRONT ADVANCING TO THE EAST OF THE WYOMING FRONT RANGE.
DUE TO LIMITED LOW-LEVEL MOISTURE...MIXED LAYER CAPE IS PRESENTLY
VERY WEAK. BUT...MID-LEVEL COOLING IN THE EXIT REGION OF STRONG
SOUTHERLY HIGH LEVEL JET IS CONTRIBUTING TO STEEPENING MID-LEVEL
LAPSE RATES. AND...LIFT SEEMS LIKELY TO OVERCOME WEAK INHIBITION
FOR AT LEAST ISOLATED TO WIDELY SCATTERED DEEP CONVECTIVE
DEVELOPMENT LATE THIS AFTERNOON...POSSIBLY AS EARLY AS 20-21Z.
AS THIS OCCURS...IN STRONGLY SHEARED DEEP LAYER FLOW WITH STRONG
CLOCKWISE CURVED LOW-LEVEL HODOGRAPHS...FORMATION OF SUPERCELLS IS
EXPECTED WITH RISK FOR TORNADOES...IN ADDITION TO LARGE HAIL/
ISOLATED DAMAGING WIND GUSTS. ACTIVITY SEEMS POSSIBLE AS FAR NORTH
AS THE BLACK HILLS AREA...WHERE FAVORABLE OROGRAPHY WILL ENHANCE
FORCING FOR STORMS...DESPITE PRESENCE OF COOLER LESS UNSTABLE
BOUNDARY LAYER.
Current wayfaring map:
http://www.wayfaring.com/maps/show/60773
Expect the next hourly update tomorrow afternoon, and expect three updates tomorrow.