WX: UK: Severe Thunderstorm Watch – Mon 28th May 2012

UK SEVERE THUNDERSTORM WATCH #022
ISSUED: 1030UTC MONDAY 28TH MAY 2012 (GB/SM)

SEVERE THUNDERSTORM WATCH FOR THE FOLLOWING REGIONS:
SOUTH-EAST ENGLAND

IN EFFECT FROM 1030UTC MONDAY 28TH MAY 2012 UNTIL 2359 MONDAY 28TH MAY 2012

COLD FRONT PUSHING NORTH EAST THROUGH ENGLAND INTO HIGH TEMPERATURES AND HIGH INSTABILITY

THERE IS A POSSIBILITY OF SEVERE WEATHER AFFECTING THE INDICATED REGIONS IN THE TIME PERIOD SPECIFIED. THREATS WITHIN THIS WATCH INCLUDE, BUT ARE NOT LIMITED TO:
LIGHTNING…HAIL…HEAVY RAIN…LOCALISED FLOODING

DISCUSSION:
COLD FRONT MOVING NE INTO HIGH TEMPERATURES AND RESULTING HIGH INSTABILITY IS LIKELY TO CAUSE A FEW THUNDERSTORMS DURING THIS AFTERNOON. ALTHOUGH BOTH LLS AND DLS IS WEAK TO ALMOST NON-EXISTENT SOME OROGRAPHIC FORCING WILL HELP TO PROMOTE THUNDERSTORM DEVELOPMENT.

UHI EFFECT TOWARDS THE SOUTH-EAST IS EXPECTED TO PLAY A LARGE PART IN TODAYS DEVELOPMENTS AND A CONVERGENCE ZONE AHEAD OF THE COLD FRONT WILL FURTHER PROVIDE SUPPORT FOR THUNDERSTORMS HERE. WITH LIGHT WINDS + LITTLE SHEAR, THUNDERSTORMS ARE LIKELY TO BE SLOW MOVING, COUPLED WITH PW VALUES >2.8CM LOCALISED FLOODING IS EXPECTED.

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