|
Mesoscale Discussion 282 |
< Previous MD Next MD >
|
|
MESOSCALE DISCUSSION 0282
NWS STORM PREDICTION CENTER NORMAN OK
0632 PM CDT TUE MAR 29 2016
AREAS AFFECTED...SW...WRN AND CNTRL NEBRASKA...ADJACENT NE COLORADO
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 292332Z - 300130Z
PROBABILITY OF WATCH ISSUANCE...5 PERCENT
SUMMARY...ONE OR TWO SEVERE STORMS /MOSTLY MARGINAL/ ARE POSSIBLE
ACROSS PARTS OF SOUTHWESTERN NEBRASKA THIS EVENING. A WATCH IS NOT
CURRENTLY ANTICIPATED...BUT TRENDS WILL BE MONITORED.
DISCUSSION...VERTICAL SHEAR FOR BOUNDARY LAYER BASED THUNDERSTORM
DEVELOPMENT IS QUITE STRONG WITHIN THE SURFACE TROUGH ACROSS THE
NORTH CENTRAL HIGH PLAINS...AS MODERATE SOUTHEASTERLY NEAR SURFACE
WINDS VEER TO SOUTHWESTERLY AND INCREASE IN SPEED TO 45+ KT AROUND
500 MB. HOWEVER...DESPITE THE PRESENCE OF STEEP LAPSE
RATES...LOW-LEVEL MOISTURE RETURN IS ONLY SUPPORTING GENERALLY WEAK
MIXED LAYER CAPE ON THE ORDER OF 500 J/KG OR LESS.
THE EXTENT TO WHICH THIS ENVIRONMENT IS ACTUALLY SUPPORTIVE OF
BOUNDARY LAYER BASED STORMS REMAINS UNCLEAR...BUT INITIAL ATTEMPTS
AT CONVECTIVE DEVELOPMENT ARE UNDERWAY NORTH AND WEST OF IMPERIAL
NEB. PERHAPS AIDED BY FAVORABLE LARGE-SCALE FORCING FOR ASCENT TO
THE NORTHEAST OF A MID-LEVEL CLOSED LOW OVER THE GREAT
BASIN...FURTHER DEEPENING/INTENSIFICATION OF CONVECTION DOES NOT
APPEAR OUT OF THE QUESTION THROUGH 00-02Z. ONE OR TWO SUPERCELLS
COULD EVENTUALLY EVOLVE...POSSIBLY ACCOMPANIED BY THE RISK FOR
SEVERE HAIL AND...PERHAPS...LOCALIZED STRONG SURFACE GUSTS BEFORE
BOUNDARY LAYER INSTABILITY WANES.
ACTIVITY SHOULD TEND TO SPREAD NORTHWARD/NORTHEASTWARD ACROSS PARTS
OF WESTERN INTO CENTRAL NEBRASKA...WHERE SOME INCREASE IN STORM
DEVELOPMENT APPEARS POSSIBLE LATER THIS EVENING IN RESPONSE TO
FORCING ASSOCIATED WITH LOW-LEVEL WARM ADVECTION. DESPITE THE
POSSIBLE INCREASE IN COVERAGE...SOMEWHAT WEAKER MID-LEVEL LAPSE
RATES...AND WEAKER SHEAR FOR STORMS ROOTED ABOVE THE BOUNDARY
LAYER...SEEM LIKELY TO RESULT IN MORE LIMITED SEVERE WEATHER
POTENTIAL.
..KERR/HART.. 03/29/2016
ATTN...WFO...LBF...GLD...BOU...CYS...
LAT...LON 41160303 42010287 42280168 41860100 40950055 40370110
40370233 41160303
|
Top/All Mesoscale Discussions/Forecast Products/Home
|
|