SKYWARN UK SEVERE WEATHER WARNING OF RAIN

SKYWARN UK SEVERE WEATHER WARNING #018 ISSUED: 1510UTC MONDAY 13TH MAY 2013 SKYWARN UK HAS ISSUED A WARNING FOR SEVERE WEATHER AS FOLLOWS: HEAVY RAIN LEADING TO A RISK OF LOCALISED FLOODING – SOUTHWEST ENGLAND, SOUTH WALES, MIDLANDS & NORTHEAST ENGLAND STRONG, POTENTIALLY DAMAGING WINDS – SOUTHERN AND SOUTHEAST ENGLAND IN EFFECT UNTIL 1800UTC WEDNESDAY 16TH MAY 2013
SKYWARN UK SEVERE WEATHER WARNING #018 ISSUED: 1510UTC MONDAY 13TH MAY 2013 SKYWARN UK HAS ISSUED A WARNING FOR SEVERE WEATHER AS FOLLOWS: HEAVY RAIN LEADING TO A RISK OF LOCALISED FLOODING – SOUTHWEST ENGLAND, SOUTH WALES, MIDLANDS & NORTHEAST ENGLAND STRONG, POTENTIALLY DAMAGING WINDS – SOUTHERN AND SOUTHEAST ENGLAND IN EFFECT UNTIL 1800UTC WEDNESDAY 16TH MAY 2013 A RAPIDLY DEVELOPING LOW TO ~980MB MOVING NORTHEAST UNDER THE ASCENT SIDE OF THE UPPER TROUGH. DISCUSSION: THERE IS IMPROVING MODEL AND PARTNER AGENCY CONFIDENCE IN THE LIKELIHOOD OF A SEVERE WEATHER RISK THROUGH TUESDAY AND OVERNIGHT INTO WEDNESDAY. A LOW CROSSES UNDER THE JETSTREAM TO THE SOUTH AND DEVELOPS RAPIDLY UP THE EASTERN SIDE OF THE UPPER TROUGH. SUCH FAVOURABLE CONDITIONS WILL LEAD TO INTENSE RAINFALL ALONG IT’S WESTERN AND NORTHERN FLANKS, WHILE ENCOURAGING GALE FORCE WINDS WITH GUSTS POSSIBLY ABOVE 70MPH THROUGH THE CHANNEL AND ACROSS SOUTHEAST ENGLAND. PRECIPIATION ACCUMULATIONS OF 30MM WIDELY, WITH POSSIBLY 60MM LOCALLY, WITHIN A 12 HOUR PERIOD ARE EXPECTED. THIS WILL LEAD TO EXCESS SURFACE WATER, RAPID RUN-OFF FROM STEEP SLOPES AND FLASH FLOODING OF INFRASTRUCTURE. THERE MAY ALSO BE A RISK OF SUDDEN RIVER FLOODING OVER HIGH GROUND. WINDS IN THE SOUTH AND SOUTHEAST MAY BE DAMAGING, ESPECIALLY FOR EXPOSED COASTS, WHILE SOME STRONG GUSTS MAY ALSO ACCOMPANY THE HEAVIEST RAINFALL FURTHER NORTHWEST. WINTRY MIXTURES OF PRECIPIATION ARE ALSO POSSIBLE OVER PARTS OF WALES AND SOUTHWEST AS THE HEAVIER RAIN MOVES AWAY, THOUGH ACCUMULATIONS OF SNOW WILL BE SHORT-LIVED. THIS WARNING MAY BE UPDATED. PLEASE MONITOR WEATHER AND TRAVEL INFO AS NECESSARY. SPOTTER ACTIVATION IS REQUESTED AND SPOTTERS ARE REQUESTED TO REPORT ALL FACTORS EXCEEDING ACTIVATION CRITERIA

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