Alert archive / Maryland / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 93, NWS Wakefield, VA

May 29, 2009Dorchester County, Maryland

NWS Wakefield, VA issued this severe thunderstorm warning at May 29, 2009, 5:21 PM EDT for Dorchester County, Maryland. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 29, 2009, 5:21 PM EDT (21:21 UTC)
Expired
May 29, 2009, 6:00 PM EDT
In force
39 min
Issued by
NWS Wakefield, VA
Area
Storm-based polygon

County Dorchester County, MD

The radar

The Dover AFB radar (KDOX), 72 km from the middle of the area, began a volume at 21:24 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 29, 1:26 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.4 hours before the alert went out and 116 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 2009-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2009-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
4 J/kg
Mixed-layer CIN
-283 J/kg
Mixed-layer LCL
620 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
139 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Wakefield, VA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 29, 2:54 PM EDT, 2 hours 27 minutes earlier.

Area forecast discussion, May 29, 2:54 PM EDT, 2 hours 27 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE WAKEFIELD VA
254 PM EDT FRI MAY 29 2009

.SYNOPSIS...
A COLD FRONT WILL PUSH ACROSS THE AREA THIS EVENING...THEN MOVE OFF
THE COAST LATE TONIGHT. HIGH PRESSURE WILL BUILD OVER THE AREA
SATURDAY INTO SUNDAY. A WEAK FRONT PUSHES THROUGH THE REGION
SUNDAY MORNING. HIGH PRESSURE WILL SLIDE OFF THE COAST MONDAY
INTO TUESDAY.

&&

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
HTG/MOD INSTABILITY ACRS FA...DP LYRD SW FLO IN PLC...JET DYNAMICS
FM NRN PART OF FA ON NEWD. WATCHING DVLPG (SCTD) CNVTN OVR WRN
VA...CVRG TO CNVTN HERE DIFFICULT TO PINPOINT ATTM. MDLS SUGG THAT
DVLPMNT OF SGFNT AREA OF CNVTN OCCURS FM MID TO LT EVE HRS...FM
LWR MD ERN SHR TO SCNTRL VA...ON TO THE E. WL INCLD ENHANCE SVR
WORDING FOR SVR WATCHES 314/315 THROUGH ERY/MID EVE HRS. ALL
AREAS WL HV SCTD CHCS...CONCERNED OVR LCLLY HVY RAINFALL.
TRANSITION OF PCPN TO THE CST LTR TNGT W/ SFC CDFNT. LWRG DWPTS
BEGIN TO SPRD INTO FAR WRN SXNS AFT MDNGT. LO TEMPS 60S TO ARND
70.

&&

.SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY/...
WK SFC HI PRES SLIDES ACRS FA (LT) SAT NGT/SUN MRNG. MDLS SUGG
SCNDRY/DRY PUSH FM THE NW FM LTR SAT THROUGH SUN. LMTD SUPPORT FOR
ANY PCPN...SO WL GO JUST CLR/PCLDY THRUT. BY MON...SFC HI PRES
OFFSHR...LLVL FLO TURNS FM E TO SSE. WL HV TO WAIT AND SEE IF ANY
MSTR WOULD SPRD INLAND/NWD INTO RGN MON AFTN.

HI TEMPS SAT/SUN IN THE 70S TO M80S...L70S TO L80S MON. COMFY
NGTS...W/ LO TEMPS SAT NGT IN THE 50S TO L60S...THEN FM THE 40S TO
U50S SUN NGT.

&&

.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
EXPECT A RETURN TO MORE DRIER...SUMMERLY LIKE WEATHER FOR AT LEAST
THE BEGINNING OF NEXT WEEK. RETURN FLOW BEHIND THE LAST FROPA ON
SUN TURNS SOUTHERLY BY MON AFTN WITH SURFACE HIGH PRES FROM THE
SOUTHERN STATES BEGINNING TO TAKE OVER AS THE DOMINANT FEATURE. THIS
HIGH BEGINS TO MOVE OFFSHORE ON MONDAY EVENING WHERE IT PARKS ITSELF
AS A BERMUDA-LIKE HIGH...ALLLOWING S/SW FLOW TO INFILTRATE OVER THE
REGION, BRINGING HIGH TEMPS 8-12 DEGREES ABOVE CLIMO NORMAL ON
MON/TUE. BY WED EXPECT A RETURN TO MORE CLIMO NORMAL TEMPS AS AS A
BACKDOOR COLD FRONT SLOWLY APPROACHES FROM THE NORTH. THE GFS AND
EURO APPEAR TO BE EQUALLY PROGRESSIVE WITH THIS FEATURE, ALONG IWHT
LOTHER LONG RAINGE GUIDANCE. BASED ON DECENT MODEL CONTINUITY BEEFED
UP POPS IN DURING THE AFTNS OF WED-FRI TO 30-40 PERCENT WITH
THUNDERSTORMS MENTIONED IN THE GRIDS BASED ON THE MODERATE TO HIGH
INSTABILITY INDICATED.

&&

.AVIATION /19Z FRIDAY THROUGH WEDNESDAY/...
SHWRS AND TSTMS DVLPNG AHEAD OF A COLD FRONT THAT WILL PUSH THRU OUR
FCST AREA THIS EVE. FIRST ROUND OF SHWRS/TSTMS DVLPNG ALG A LINE
FROM CHO TO JUST WEST OF DAN...COVERAGE AND TIMING MAIN PROBLEM SO
HAVE CB IN ALL SITES WITH FIRST SITES AFFECTED RIC AND SBY. CHNC OF
RA LINGERS ALG CST UNTIL FRONT PUSHES OFFSHORE LATER TONIGHT.

AFTER THE FRONT MVS THROUGH TONIGHT...SKIES WILL CLEAR AND DRIER
AIR FINALLY MEANS LITTLE/NO THREAT OF LOW CLOUDS/FG OVERNIGHT.
CONDS REMAIN VFR ON SAT AND SUN.

&&

.MARINE...
A FRONT MVS OVER THE WATERS THIS EVENING...SHIFTING WINDS TO THE
WEST AND THEN EVENTUALLY NORTH BY MID MORNING ON SAT. PRES GRAD IS
NOT VERY IMPRESSIVE WITH THIS FEATURE...SO CONDS SHOULD REMAIN BELOW
SMALL CRAFT CRITERIA...WITH WINDS HIGHEST AROUND 15 KTS.

SPEEDS REMAIN 10 KT OR LESS FOR THR REST OF THE WEEKEND...ALTHOUGH
DIRECTIONS WILL AGAIN BE SHIFTING AROUND DUE TO ANOTHER WEAK FRONT
MVG THROUGH THE AREA ON SUNDAY. NO FLAGS ANTICIPATED THROUGH AT
LEAST MID WEEK.

&&

.AKQ WATCHES/WARNINGS/ADVISORIES...
MD...NONE.
NC...NONE.
VA...NONE.
MARINE...NONE.

&&

SYNOPSIS...ALB/TMG
NEAR TERM...ALB
SHORT TERM...ALB
LONG TERM...SMF
AVIATION...CY
MARINE...SMF
Hazardous weather outlook, May 29, 4:08 PM EDT, 1 hour 13 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE WAKEFIELD VA
408 PM EDT FRI MAY 29 2009

ANZ631>633-NCZ012>017-030>032-102-VAZ060-065>068-070-079>082-084-
086>098-100-302015-
CHESAPEAKE BAY FROM WINDMILL POINT TO NEW POINT COMFORT VA-
CHESAPEAKE BAY FROM NEW POINT COMFORT TO CAPE HENRY VA-
CURRITUCK SOUND-NORTHAMPTON NC-HERTFORD-GATES-PASQUOTANK-CAMDEN-
INLAND CURRITUCK-BERTIE-CHOWAN-PERQUIMANS-OUTER BANKS CURRITUCK-
PRINCE EDWARD-MECKLENBURG-LUNENBURG-NOTTOWAY-AMELIA-CHESTERFIELD-
BRUNSWICK-DINWIDDIE-PRINCE GEORGE-CHARLES CITY-GLOUCESTER-MATHEWS-
GREENSVILLE-SUSSEX-SURRY-JAMES CITY-YORK-SOUTHAMPTON-ISLE OF WIGHT-
NEWPORT NEWS/HAMPTON-NORFOLK/PORTSMOUTH-SUFFOLK-CHESAPEAKE-
VIRGINIA BEACH-NORTHAMPTON VA-
408 PM EDT FRI MAY 29 2009

...SEVERE THUNDERSTORM WATCH 315 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE SOUTHERN CHESAPEAKE
BAY...CURRITUCK SOUND...COASTAL NORTHEAST NORTH CAROLINA...INTERIOR
NORTHEAST NORTH CAROLINA...THE NORTHERN OUTER BANKS OF NORTH
CAROLINA...CENTRAL VIRGINIA...EAST CENTRAL VIRGINIA...INTERIOR
SOUTHEAST VIRGINIA...SOUTH CENTRAL VIRGINIA...SOUTH HAMPTON ROADS
VIRGINIA...THE EASTERN SHORE OF VIRGINIA...THE MIDDLE PENINSULA OF
VIRGINIA...THE PENINSULA OF SOUTHEAST VIRGINIA AND THE PIEDMONT OF
CENTRAL VIRGINIA.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SEVERE THUNDERSTORM WATCH.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

ANZ630-MDZ021>025-VAZ048-049-061>064-069-071>078-083-085-099-302015-
CHESAPEAKE BAY FROM SMITH POINT TO WINDMILL POINT VA-DORCHESTER-
WICOMICO-SOMERSET-INLAND WORCESTER-MARYLAND BEACHES-FLUVANNA-LOUISA-
CUMBERLAND-GOOCHLAND-HANOVER-CAROLINE-POWHATAN-HENRICO-KING WILLIAM-
KING AND QUEEN-ESSEX-WESTMORELAND-RICHMOND-NORTHUMBERLAND-LANCASTER-
NEW KENT-MIDDLESEX-ACCOMACK-
408 PM EDT FRI MAY 29 2009

...SEVERE THUNDERSTORM WATCH 314 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE CENTRAL CHESAPEAKE
BAY...THE LOWER EASTERN SHORE OF MARYLAND...CENTRAL VIRGINIA...EAST
CENTRAL VIRGINIA...THE EASTERN SHORE OF VIRGINIA...THE MIDDLE
PENINSULA OF VIRGINIA...THE NORTHERN NECK OF VIRGINIA AND THE
PIEDMONT OF CENTRAL VIRGINIA.

.DAY ONE...TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SEVERE THUNDERSTORM WATCH.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

ANZ650-652-654-656-658-302015-
COASTAL WATERS FROM FENWICK ISLAND DE TO CHINCOTEAGUE VA OUT 20 NM-
COASTAL WATERS FROM CHINCOTEAGUE TO PARRAMORE ISLAND VA OUT 20 NM-
COASTAL WATERS FROM PARRAMORE ISLAND TO CAPE CHARLES LIGHT VA OUT
20 NM-
COASTAL WATERS FROM CAPE CHARLES LIGHT VA TO NC VA BORDER OUT 20 NM-
COASTAL WATERS FROM NC VA BORDER TO CURRITUCK BEACH LIGHT NC OUT
20 NM-
408 PM EDT FRI MAY 29 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE MID ATLANTIC COASTAL
WATERS.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

In the hours before

Special weather statement, May 29, 3:31 PM EDT, 1 hour 50 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WAKEFIELD VA
331 PM EDT FRI MAY 29 2009

VAZ065>067-292030-
LUNENBURG VA-MECKLENBURG VA-NOTTOWAY VA-
331 PM EDT FRI MAY 29 2009

...A LINE OF STRONG THUNDERSTORMS APPROACHING WESTERN LUNENBURG AND
MECKLENBURG COUNTIES...

AT 330 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
NEARLY SOLID LINE OF STRONG THUNDERSTORMS FROM 14 MILES WEST OF
VICTORIA TO 30 MILES SOUTHWEST OF CHASE CITY...OR FROM KEYSVILLE TO
11 MILES NORTHWEST OF VIRGILINA...MOVING EAST AT 25 MPH. THE STRONG
THUNDERSTORMS WILL BE NEAR...
  VICTORIA AROUND 410 PM EDT...
  KENBRIDGE AROUND 430 PM EDT...

WIND GUSTS TO 50 MPH AND SMALL HAIL ARE EXPECTED WITH THESE
STORMS.

EXPECT FREQUENT CLOUD TO GROUND LIGHTNING IN THE PATH OF THESE
STORMS. IF YOU HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING. MOVE INTO A SAFE SHELTER BEFORE THESE STORMS REACH YOUR
AREA. REMAIN INDOORS UNTIL THE STORMS HAVE PASSED.

RAINFALL RATES OF 1 TO 2 INCHES PER HOUR WILL CAUSE PONDING OF WATER
ON ROADWAYS...AND POSSIBLE LOCALIZED FLOODING IN LOW LYING AND OTHER
POOR DRAINAGE AREAS.

ALB
Special weather statement, May 29, 4:28 PM EDT, 53 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WAKEFIELD VA
428 PM EDT FRI MAY 29 2009

VAZ060-062-063-065>071-079-080-292130-
AMELIA VA-BRUNSWICK VA-CHESTERFIELD VA-DINWIDDIE VA-GOOCHLAND
VA-HANOVER VA-HENRICO VA-LUNENBURG VA-MECKLENBURG VA-NOTTOWAY
VA-POWHATAN VA-PRINCE EDWARD VA-
428 PM EDT FRI MAY 29 2009

...SCATTERED THUNDERSTORMS MOVING INTO CENTRAL AND SOUTH CENTRAL
VIRGINIA...

AT 428 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SCATTERED STRONG THUNDERSTORMS FROM GOOCHLAND TO 16 MILES
SOUTHWEST OF CHASE CITY...OR FROM GOOCHLAND TO 9 MILES NORTHEAST OF
VIRGILINA...MOVING EAST AT 20 MPH. THE THUNDERSTORMS WILL BE
NEAR...  OILVILLE AROUND 435 PM EDT...
  RUBERMOUNT AROUND 440 PM EDT...
  JOHNSONS SPRINGS AROUND 445 PM EDT...
  CENTERVILLE AROUND 450 PM EDT...
  THE FALLS AROUND 455 PM EDT...
  WILBURN AROUND 500 PM EDT...

WIND GUSTS TO 45 TO 50 MPH AND SMALL HAIL ARE EXPECTED WITH THESE
STORMS.

EXPECT FREQUENT CLOUD TO GROUND LIGHTNING IN THE PATH OF THESE
STORMS. IF YOU HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING. MOVE INTO A SAFE SHELTER BEFORE THESE STORMS REACH YOUR
AREA. REMAIN INDOORS UNTIL THE STORMS HAVE PASSED.

RAINFALL RATES OF 1 TO 1.5 INCHES PER HOUR WILL CAUSE PONDING OF
WATER ON ROADWAYS...AND POSSIBLE LOCALIZED FLOODING IN LOW LYING AND
OTHER POOR DRAINAGE AREAS.

ALB
Special weather statement, May 29, 4:48 PM EDT, 33 minutes before
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Special weather statement, May 29, 5:14 PM EDT, 7 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WAKEFIELD VA
514 PM EDT FRI MAY 29 2009

MDZ021-022-292200-
DORCHESTER MD-WICOMICO MD-
514 PM EDT FRI MAY 29 2009

...STRONG THUNDERSTORM MOVING INTO NORTHERN DORCHESTER COUNTY...

AT 514 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER HURLOCK...MOVING EAST AT 25 MPH. THE STRONG
THUNDERSTORMS WILL BE NEAR ELDORADO...AND...BROOKVIEW AT 525 PM EDT.

WIND GUSTS TO 40 MPH...SMALL HAIL AND FREQUENT CLOUD TO
GROUND LIGHTNING ARE EXPECTED IN THE PATH OF THESE STORMS. IF YOU
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE
INTO A SAFE SHELTER BEFORE THESE STORMS REACH YOUR AREA. REMAIN
INDOORS UNTIL THE STORMS HAVE PASSED.

RAINFALL RATES OF UP TO 1 INCH PER HOUR WILL CAUSE PONDING OF WATER
ON ROADWAYS...AND POSSIBLE LOCALIZED FLOODING IN LOW LYING AND FLOOD
PRONE AREAS.

SMF

The office that day

Everything else NWS Wakefield, VA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 29, 4:59 PM EDTSevere Thunderstorm WarningAKQMecklenburg48 min
May 29, 7:05 PM EDTSpecial Marine WarningAKQ115 min
May 29, 7:46 PM EDTSpecial Marine WarningAKQ59 min
May 29, 5:47 PM EDTSevere Thunderstorm WarningAKQDorchester10 min
May 29, 7:18 PM EDTSevere Thunderstorm WarningAKQWicomico42 min
May 29, 7:41 PM EDTSevere Thunderstorm WarningAKQWicomico, Worcester49 min
May 29, 7:51 PM EDTSevere Thunderstorm WarningAKQWorcester54 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2009Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.