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September 17-19 2012 rain and severe weather potential


SNO

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 642

NWS STORM PREDICTION CENTER NORMAN OK

1055 AM EDT TUE SEP 18 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF

DISTRICT OF COLUMBIA

MARYLAND

NORTHERN NORTH CAROLINA

CENTRAL AND EASTERN VIRGINIA

EASTERN WEST VIRGINIA PANHANDLE

COASTAL WATERS

EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1055 AM UNTIL 700

PM EDT.

TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 35 MILES EAST SOUTHEAST OF

SOUTH HILL VIRGINIA TO 40 MILES NORTH NORTHEAST OF BALTIMORE

MARYLAND. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS.

OTHER WATCH INFORMATION...CONTINUE...WW 641...

DISCUSSION...A GRADUAL INCREASE IN STORM COVERAGE AND INTENSITY IS

EXPECTED TODAY AS LARGE-SCALE FORCING FOR ASCENT INCREASES ACROSS A

VERY MOIST AND MARGINALLY UNSTABLE WARM SECTOR. CURRENT VAD AND

MODEL FORECAST DATA INDICATE A CONTINUED STRENGTHENING OF THE

DEEP-LAYER WIND FIELD THROUGH THE PEAK OF THE DIURNAL HEATING CYCLE

WITH THE ENVIRONMENT BECOMING SUPPORTIVE OF EMBEDDED BOW/LEWP AND

SUPERCELL STRUCTURES CAPABLE OF TORNADOES AND DAMAGING WINDS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 23040.

...MEAD

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BULLETIN - EAS ACTIVATION REQUESTED

SEVERE THUNDERSTORM WARNING

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

1113 AM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

SOUTHERN FREDERICK COUNTY IN NORTH CENTRAL MARYLAND...

SOUTHERN WASHINGTON COUNTY IN NORTH CENTRAL MARYLAND...

EASTERN CLARKE COUNTY IN NORTHWEST VIRGINIA...

JEFFERSON COUNTY IN THE PANHANDLE OF WEST VIRGINIA...

NORTHERN LOUDOUN COUNTY IN NORTHERN VIRGINIA...

* UNTIL NOON EDT

* AT 1111 AM EDT...SEVERE THUNDERSTORMS WERE DETECTED ALONG A LINE

EXTENDING FROM CHARLES TOWN TO BLUEMONT...AND WERE MOVING NORTHEAST

AT 45 MPH. THIS LINE OF STORMS IS CAPABLE OF PRODUCING DAMAGING

WINDS IN EXCESS OF 60 MPH.

* LOCATIONS IMPACTED INCLUDE...

ROUND HILL...

NEERSVILLE...

PURCELLVILLE...

BRUNSWICK...

POINT OF ROCKS...

BRADDOCK HEIGHTS...

FREDERICK...

BALLENGER CREEK...

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Watch out Front Royal

BULLETIN - EAS ACTIVATION REQUESTED

SEVERE THUNDERSTORM WARNING

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

1115 AM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

SOUTHERN SHENANDOAH COUNTY IN NORTHWEST VIRGINIA...

WARREN COUNTY IN NORTHWEST VIRGINIA...

SOUTHERN FREDERICK COUNTY IN NORTHWEST VIRGINIA...

NORTHERN PAGE COUNTY IN NORTHWEST VIRGINIA...

* UNTIL NOON EDT

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Mod risk at 1630 from SPC to end the severe year... ;)

You got it!

MESOSCALE DISCUSSION 1960

NWS STORM PREDICTION CENTER NORMAN OK

1019 AM CDT TUE SEP 18 2012

AREAS AFFECTED...FAR NRN SC...CNTRL/ERN NC...CNTRL/ERN VA...DISTRICT

OF COLUMBIA...CNTRL/ERN MD...MUCH OF DE...ERN PA...WRN/NRN

NJ...PARTS OF ERN NY

CONCERNING...OUTLOOK UPGRADE

VALID 181519Z - 181645Z

SUMMARY...A CATEGORICAL UPGRADE TO MODERATE RISK IS PLANNED FOR THE

UPCOMING 1630 UTC DAY-1 CONVECTIVE OUTLOOK FROM PARTS OF THE

CAROLINAS NWD INTO PARTS OF ERN NY.

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mod risk inbound

Looks like 45 wind... maybe 15 tor?

DISCUSSION...STRONG LOW-LEVEL AND DEEP SHEAR IN ASSOCIATION WITH A

CONUS-FULL-LATITUDE TROUGH WILL SUPPORT MULTIPLE QLCS SEGMENTS

ACROSS A BROAD WARM SECTOR OVER THE ERN CONUS. WIDESPREAD SVR WIND

GUSTS WILL BE THE MAIN CONCERN ACROSS THE UPCOMING MODERATE RISK

AREA...AND SVR WIND PROBABILITIES WILL BE INCREASED TO 45 PERCENT

ACROSS THIS REGION. HOWEVER...TORNADOES WILL ALSO BE

POSSIBLE...PARTICULARLY WITH EMBEDDED LEWP STRUCTURES...LINE

BREAKS...AND DISCRETE CONVECTION EVOLVING AHEAD AN APPROACHING

EXTENSIVE COLD FRONT. PLEASE SEE THE FORTHCOMING OUTLOOK FOR

ADDITIONAL METEOROLOGICAL INFORMATION.

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Looks like 45 wind... maybe 15 tor?

DISCUSSION...STRONG LOW-LEVEL AND DEEP SHEAR IN ASSOCIATION WITH A

CONUS-FULL-LATITUDE TROUGH WILL SUPPORT MULTIPLE QLCS SEGMENTS

ACROSS A BROAD WARM SECTOR OVER THE ERN CONUS. WIDESPREAD SVR WIND

GUSTS WILL BE THE MAIN CONCERN ACROSS THE UPCOMING MODERATE RISK

AREA...AND SVR WIND PROBABILITIES WILL BE INCREASED TO 45 PERCENT

ACROSS THIS REGION. HOWEVER...TORNADOES WILL ALSO BE

POSSIBLE...PARTICULARLY WITH EMBEDDED LEWP STRUCTURES...LINE

BREAKS...AND DISCRETE CONVECTION EVOLVING AHEAD AN APPROACHING

EXTENSIVE COLD FRONT. PLEASE SEE THE FORTHCOMING OUTLOOK FOR

ADDITIONAL METEOROLOGICAL INFORMATION.

possible.. tho 10% is already pretty high. i'd lean toward is staying 10%.

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