Severe Thunderstorm Warning 13, NWS Baltimore/Washington

393 
WWUS51 KLWX 210110
SVSLWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
910 PM EDT MON APR 20 2015

MDC009-017-033-037-VAC099-177-179-210120-
/O.CAN.KLWX.SV.W.0013.000000T0000Z-150421T0130Z/
CHARLES MD-PRINCE GEORGES MD-ST. MARYS MD-CALVERT MD-SPOTSYLVANIA VA-
KING GEORGE VA-STAFFORD VA-
910 PM EDT MON APR 20 2015

...THE SEVERE THUNDERSTORM WARNING FOR CHARLES...SOUTHEASTERN PRINCE
GEORGES...NORTHWESTERN ST. MARYS...CENTRAL CALVERT...NORTHEASTERN
SPOTSYLVANIA...NORTHERN KING GEORGE AND SOUTHEASTERN STAFFORD
COUNTIES IS CANCELLED...
            
THE STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 3843 7644 3834 7698 3843 7701 3844 7704
      3839 7714 3837 7709 3840 7704 3837 7701
      3833 7702 3826 7744 3842 7732 3837 7729
      3838 7725 3848 7728 3852 7725 3866 7653
      3862 7651 3852 7651
TIME...MOT...LOC 0109Z 229DEG 34KT 3869 7700 3840 7730 

$$

BAJ

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
325 PM EDT MON APR 20 2015

.SYNOPSIS...
A WARM FRONT RESIDES JUST NORTH OF THE AREA LATE TODAY. A COLD
FRONT WILL PUSH EAST ACROSS THE REGION EARLY THIS EVENING. AN
UPPER LOW WILL THEN PERSIST ACROSS THE GREAT LAKES TO NEW ENGLAND
THROUGHOUT THE WEEK.

&&

.NEAR TERM /THROUGH TUESDAY/...
SFC WMFNT HAS JUST SNUCK OVER THE MD/PA BORDER. CDFNT STILL ACROSS
WVA. ALTHO CWFA W/IN WARM SECTOR...A CPL OF CHALLENGES HAVE CROPPED
UP. FIRST IS THE DEBRIS CI WHICH HAS IMPEDED SGFNT WARMING. SECOND
ARE MID LVL CAPS AT H8 AND H6. THE COMBO OF THE TWO HV RESULTED IN A
COLUMN THAT STILL IS STBL. INITIATION HAS OCCURRED W OF THE CWFA...
IN A MORE FVRBL ENVIRONMENT.

TREND IN SOME GDNC IS TO DELAY ONSET OF PCPN. THE GDNC SETS THAT
HAVENT CAUGHT ONTO THIS TREND HV BEEN DVLPG PCPN TOO SOON...AND HV
BEEN NEGLECTED. BELIEVE THAT MID LVL COOLING WL STILL TAKE PLACE...
AND THE CI SOON TO DEPART. THEREFORE...STILL BELIEVE THAT WE WL
BE DSTBLZG SOON.

DECENT SHEAR AND INCRSG INSTBY SUGGESTS THAT A THREAT FOR SVR WX
STILL EXISTS. FURTHER...AS UPR LVL SPD MAX CREEPS UP COAST JUST AHD
OF APPRCHG CDFNT...WL HV NCSRY FORCING FOR ENHANCED LIFT. THEREFORE
WL HV DELAYED ONSET...OTRW HV MADE FEW CHGS TO GOING FCST TAFTN-
EVNG. AS NAM DEPICTS...ONCE INITIATION BEGINS XPCT RAPID DVLPMNT TO
TAKE PLACE. THINK ITLL BE MIXED MODE...W/ WIND AND HAIL THREATS. FZL
AND WBZ QUITE LOW WHILE LOW-MID LVL LAPSE RATES MDT-HIGH.  IN
ADDITION...HV BACKED LLVL FLOW NEAR WMFNT. AS A RESULT...SPC HAS
ISSUED A TOR WATCH FOR ENTIRE AREA TIL 02Z.

WL HV DECREASING THUNDER CHCS AFTR SUNSET...BUT PCPN MAY LINGER TIL
MIDNGT-ISH WHEN CDFNT CLEARS AREA. AFTER THAT LOOK FOR A RAPIDLY
DRYING AMS AS WLY WINDS INCREASE. HV HELD ONTO SOME CLDS THO DUE TO
MID LVL TROF AXIS.

DP UPR LOW WL RESIDE NORTH OF THE GRTLKS TMRW...WHICH WL PROVIDE
FAST MID-LVL FLOW. KEEPING A DRY FCST W/ CLDY PERIODS AS IMPULSES
ZIP THRU THE FLOW. DOWNSLOPING WL PROVIDE THE WARMING IN SPITE OF
CAA.

&&

.SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/...

NOT MUCH OF A BREAK BETWEEN SYSTEMS AS THE MID-ATLC STAYS JUST ON
THE OUTER FRINGE OF A LARGE UPPER GREAT LAKES TROUGH. ONE OF THE
WEAKER VORTS SLIDING AROUND THE BASE OF THE TROUGH WILL SLIDE INTO
THE WINDWARD SIDE OF THE APLCNS LATE TUE NIGHT. LITTLE MORE THAN
COOLER AIR WILL MAKE IT OVER THE MTNS...W/ THE MOISTURE DISSIPATING
OVER THE HIGHER TERRAIN. HEADING INTO EARLY WED...A STRONGER LOW
PRESSURE SYSTEM WILL BE DEVELOPING WELL TO OUR NORTH WHICH WILL ALSO
STRENGTHEN THE INCOMING COLD FRONT.

GUSTY SW WINDS WILL ARRIVE BEFORE ANY PRECIP E OF THE APLCNS...AND
GRADUALLY PULL UP OUR COOL TEMPS FROM OVERNIGHT BACK INTO A WARMER
REGIME BY MIDDAY. UNLIKE TODAY'S CONDITIONS...THIS FRONTAL PASSAGE
IS NOT EXPECTED TO MUSTER UP MUCH INSTABILITY. THE SRN HALF OF THE
CWA MAY SEE SOME WEAK CONVECTIVE POTENTIAL BUT THE REMAINDER OF THE
AREA WILL SEE AT SOLID CHANCE FOR RAIN SHOWERS. TEMPS WILL BE ABOVE
AVG FOR THE VA/MD PIEDMONT. QPF FAIRLY LIGHT FOR THIS PASSAGE AND A
RELATIVELY BRIEF PERIOD OF THE MID AFTN TO EVE. BY LATE EVE...MOST
OF THE PRECIP WILL BE SLIDING OUT OF THE SE PORTION OF THE CWA AND
CLOUDS WILL ALLOW EXIT OFF THE COAST.
&&

.LONG TERM /THURSDAY THROUGH MONDAY/...
LONG TERM PERIOD WILL BE DOMINATED BY A COLD UPPER-LEVEL LOW
PRESSURE SYSTEM STALLED OVER THE NORTHEASTERN CONUS...WITH
PERSISTENT CHILLY WEST OR NORTHWEST FLOW OVER THE REGION.

A TROUGH MAY BRING PRECIPITATION TO THE AREA SATURDAY...BUT OTHER
THAN THAT IT LOOKS MAINLY DRY. TEMPERATURES WILL BE WELL BELOW
NORMAL /I.E. 10-15 DEGREES BELOW NORMAL/ THROUGH THE PERIOD WITH
HIGH STRUGGLING TO GET OUT OF THE 50S AND LOWS IN THE UPPER 30S TO
40S.

&&

.AVIATION /19Z MONDAY THROUGH SATURDAY/...

AM KEEPING VFR TAFS THRU THE PD. HWVR...THERE ARE OTHER
CONSIDERATIONS. NMRS TSRA WL BE DVLPG TAFTN. XPCT BRIEF CIG/VIS
RESTRICTIONS W/IN ANY STORMS. THE MITIGATING FACTOR IS AREAL CVRG.
ONCE THAT BECOME CLEAR...THEN RESTRICTIONS WL BE ADDED TO TAFS.
THREAT WINDOW WL BE 20/21Z THRU 02Z.

WLY WINDS OVNGT THRU TUE...W/ GUSTS UP TO 20 KT ATTM.

ANOTHER COLD FRONT WILL SWING THRU ON WED AFTN. GUSTY SW WINDS AHEAD
OF THE FRONT AND MAINLY BRIEF/SCTD SHOWER ALONG THE BOUNDARY AS IT
SLIDE THRU DURING THE 2ND HALF OF THE DAY.

WLY FLOW 10 KT OR SO W/ MAINLY VFR EXPECTED THU-SAT.

&&

.MARINE...

SLY FLOW TAFTN-EVE...SCA AT TIMES. STORMS POSSIBLE LATE
AFTERNOON/EVENING WITH STRONG WINDS AND HAIL. COLD FRONT CROSSES
TONIGHT WITH WIND SHIFT TO WEST. PERHAPS A WEAKENING OF WINDS NEAR
DAWN TUESDAY...BUT THEN INCREASE AGAIN TO SCA LEVELS DURING THE DAY.

SOLID SCA WINDS POSSIBLE ON WED AHEAD OF AND ALONG A COLD FRONT THAT
IS EXPECTED TO SWING THRU THE WATERS BY LATE EVE.

SCA GUSTS POSSIBLE IN WLY SURGE BEHIND FRONTAL BOUNDARY
THURSDAY...THEN LIGHTER FLOW BELOW SCA CRITERIA LIKELY FRIDAY-
SATURDAY.

&&

.TIDES/COASTAL FLOODING...
WATER LEVELS STILL BETWEEN 1.5 AND 2.0 FT ABV ASTRO NORMS. AT THIS
RATE...WILL HAVE MINOR FLOODING AT ANNAPOLIS AND BALTIMORE. SLY
FLOW WILL REINFORCE THE POSITIVE DEPARTURES. HOWEVER...A COLD
FRONT WILL BE APPROACHING...SWINGING AROUND WIND DIRECTION RIGHT
NEAR THE TIME OF HIGH TIDE. THAT MAKES IT LOWER CONFIDENCE...BUT
STILL OPTED TO ISSUE ADVY. WILL CONTINUE TO MONITOR.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...NONE.
MD...COASTAL FLOOD ADVISORY UNTIL 11 PM EDT THIS EVENING FOR MDZ011-
     014.
VA...NONE.
WV...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 6 PM EDT TUESDAY FOR ANZ530>534-
     537>543.
     SMALL CRAFT ADVISORY UNTIL 1 AM EDT TUESDAY FOR ANZ535-536.
     SMALL CRAFT ADVISORY FROM 10 AM TO 6 PM EDT TUESDAY FOR ANZ535-
     536.

&&

SYNOPSIS...HTS
NEAR TERM...HTS
SHORT TERM...GMS
LONG TERM...DFH
AVIATION...GMS/HTS/DFH
MARINE...GMS/HTS/DFH
TIDES/COASTAL FLOODING...HTS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
757 PM EDT MON APR 20 2015

ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-211400-
CHESAPEAKE BAY NORTH OF POOLES ISLAND MD-
CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD-
CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD-
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD-
CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA-
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD-
TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD-
TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA-
PATAPSCO RIVER INCLUDING BALTIMORE HARBOR-
CHESTER RIVER TO QUEENSTOWN MD-EASTERN BAY-
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER-
PATUXENT RIVER TO BROOMES ISLAND MD-
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH
ISLAND-DISTRICT OF COLUMBIA-SOUTHERN BALTIMORE-PRINCE GEORGES-
ANNE ARUNDEL-CHARLES-ST. MARYS-CALVERT-SOUTHEAST HARFORD-
PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA-
KING GEORGE-
757 PM EDT MON APR 20 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE MARYLAND PORTION OF THE
CHESAPEAKE BAY...TIDAL POTOMAC RIVER...AND ADJACENT COUNTIES IN
CENTRAL MARYLAND AND NORTHERN VIRGINIA AS WELL AS THE DISTRICT OF
COLUMBIA.

.DAY ONE...TONIGHT

A TORNADO WATCH IS IN EFFECT FOR THE OUTLOOK AREA UNTIL 10 PM.
THUNDERSTORMS MAY BECOME SEVERE WITH A THREAT OF DAMAGING WIND
GUSTS...LARGE HAIL AND AN ISOLATED TORNADO.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SKYWARN HAS BEEN ACTIVATED. PLEASE REPORT ANY SEVERE WEATHER TO
THE NATIONAL WEATHER SERVICE.

MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053-
055-501>506-211400-
WASHINGTON-FREDERICK MD-CARROLL-NORTHERN BALTIMORE-
EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY-
NORTHWEST MONTGOMERY-CENTRAL AND SOUTHEASTERN MONTGOMERY-
NORTHWEST HOWARD-CENTRAL AND SOUTHEAST HOWARD-NORTHWEST HARFORD-
AUGUSTA-ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE-
NELSON-ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-ORANGE-CULPEPER-
NORTHERN FAUQUIER-SOUTHERN FAUQUIER-WESTERN HIGHLAND-
EASTERN HIGHLAND-WESTERN LOUDOUN-EASTERN LOUDOUN-
NORTHERN VA BLUE RIDGE-CENTRAL VA BLUE RIDGE-HAMPSHIRE-MORGAN-
BERKELEY-JEFFERSON-HARDY-WESTERN GRANT-EASTERN GRANT-
WESTERN MINERAL-EASTERN MINERAL-WESTERN PENDLETON-
EASTERN PENDLETON-
757 PM EDT MON APR 20 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN WEST VIRGINIA...
NORTHERN AND CENTRAL VIRGINIA...AND CENTRAL AND WESTERN MARYLAND
WITH THE EXCEPTION OF GARRETT COUNTY.

.DAY ONE...TONIGHT

A TORNADO WATCH IS IN EFFECT FOR THE OUTLOOK AREA UNTIL 10 PM.
THUNDERSTORMS MAY BECOME SEVERE WITH A THREAT OF DAMAGING WIND
GUSTS...LARGE HAIL AND AN ISOLATED TORNADO.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SKYWARN HAS BEEN ACTIVATED. PLEASE REPORT ANY SEVERE WEATHER TO
THE NATIONAL WEATHER SERVICE.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
531 PM EDT MON APR 20 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0529 PM     HAIL             1 E WOLFE MILL          39.68N  78.71W
04/20/2015  M0.88 INCH       ALLEGANY           MD   TRAINED SPOTTER

&&

EVENT NUMBER LWX1500052

MSE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
533 PM EDT MON APR 20 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0509 PM     HAIL             E FORT ASHBY            39.50N  78.77W
04/20/2015  M0.75 INCH       MINERAL            WV   BROADCAST MEDIA

            RELAYED BY MEDIA

&&

EVENT NUMBER LWX1500053

SEARS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
709 PM EDT MON APR 20 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0708 PM     HAIL             2 WNW BERRYVILLE        39.62N  78.26W
04/20/2015  M1.00 INCH       MORGAN             WV   TRAINED SPOTTER

&&

EVENT NUMBER LWX1500054

MSE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
804 PM EDT MON APR 20 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0801 PM     HAIL             WESTOVER                38.88N  77.13W
04/20/2015  E0.75 INCH       ARLINGTON          VA   TRAINED SPOTTER

&&

EVENT NUMBER LWX1500055

LEE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
825 PM EDT MON APR 20 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0820 PM     HAIL             1 W FAIRLAND            39.08N  76.97W
04/20/2015  M0.75 INCH       MONTGOMERY         MD   TRAINED SPOTTER

&&

EVENT NUMBER LWX1500056

MSE