|
Mesoscale Discussion 327 |
< Previous MD Next MD >
|
|
MESOSCALE DISCUSSION 0327
NWS STORM PREDICTION CENTER NORMAN OK
1246 PM CDT FRI APR 01 2016
AREAS AFFECTED...PORTIONS OF THE MID-ATLANTIC AND SOUTHERN NEW
ENGLAND
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 011746Z - 011945Z
PROBABILITY OF WATCH ISSUANCE...20 PERCENT
SUMMARY...A BROKEN BAND OF SHOWERS AND THUNDERSTORMS WILL GRADUALLY
ORGANIZE THIS AFTERNOON FROM NORTHERN VIRGINIA TO SOUTHERN NEW
ENGLAND. SOME THREAT FOR A FEW DAMAGING WIND GUSTS AND A MARGINALLY
SEVERE HAIL REPORT OR TWO IS EXPECTED. WATCH ISSUANCE IS CURRENTLY
UNLIKELY...BUT CONDITIONS WILL BE MONITORED FOR AN INCREASE IN
THUNDERSTORM ORGANIZATION.
DISCUSSION...RECENT SATELLITE AND RADAR MOSAIC IMAGERY DEPICT A BAND
OF SCATTERED SHOWERS AND THUNDERSTORMS STRETCHING FROM WESTERN NEW
ENGLAND SOUTHWESTWARD TO WEST VIRGINIA. MID-LEVEL ASCENT FROM A
PASSING IMPULSE...AS WELL AS SOME SFC CONVERGENCE ALONG/NEAR A
PRE-FRONTAL TROUGH...ARE LIKELY AIDING THIS CONVECTION. AS LOW-LEVEL
CONVERGENCE ADVANCES EASTWARD...DEVELOPING CELLS WILL ENCOUNTER A
MORE FAVORABLE THERMODYNAMIC ENVIRONMENT...CHARACTERIZED BY DEW
POINTS IN THE UPPER 50S/LOWER 60S AND MLCAPE VALUES AROUND 500-800
J/KG. SUCH DESTABILIZATION IS BEING AIDED BY A CONSIDERABLE
CLEARING/THINNING OF CLOUD COVER ACROSS MUCH OF THE REGION.
WHILE THE VERTICAL DISTRIBUTION OF BUOYANCY SUGGESTS UPDRAFT
ACCELERATION SHOULD NOT BE TOO STRONG...LONG/STRAIGHT HODOGRAPHS
/I.E. AMPLE UNIDIRECTIONAL SHEAR/ SHOULD BE FAVORABLE FOR SMALL
BOWING SEGMENTS AND STORM SPLITS. WHERE DIURNAL HEATING HAS RESULTED
IN STEEPER LOW-LEVEL LAPSE RATES...EFFICIENT DOWNWARD TRANSPORT OF
STRONG FLOW ALOFT SHOULD FAVOR A FEW DAMAGING WIND GUSTS THIS
AFTERNOON AND EARLY EVENING. ALTHOUGH HAIL GROWTH SHOULD BE LIMITED
BY A LACK OF GREATER BUOYANCY ALOFT...PLENTIFUL DEEP-LAYER SHEAR
WILL PROMOTE MID-LEVEL ROTATION AND PERHAPS A COUPLE SEVERE HAIL
REPORTS. WHILE WATCH ISSUANCE IS CURRENTLY NOT
ANTICIPATED...CONDITIONS WILL BE MONITORED CLOSELY FOR A POTENTIAL
INCREASE IN THE THREAT...ESPECIALLY CONSIDERING THE STRENGTH OF THE
KINEMATIC FIELD.
..PICCA/HART.. 04/01/2016
ATTN...WFO...GYX...BOX...OKX...ALY...PHI...BGM...CTP...LWX...
LAT...LON 39917809 40937709 42797451 43157355 43207263 43097246
42577255 41597305 41187324 40627372 40307410 40167426
39207577 38927690 38707806 38767875 39037885 39407867
39917809
|
Top/All Mesoscale Discussions/Forecast Products/Home
|
|