Alert archive / Virginia / Tornado Watches in 2002

Tornado Watch 177

April 28, 20024 states

The Storm Prediction Center issued this tornado watch at Apr 28, 2002, 6:00 PM EDT for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Apr 28, 2002, 6:00 PM EDT (22:00 UTC)
Expired
Apr 28, 2002, 10:00 PM EDT
In force
4 hr
Issued by
the Storm Prediction Center
All 63 counties

Kent County, DE, New Castle County, DE, Sussex County, DE, Calvert County, MD, Caroline County, MD, Cecil County, MD, Dorchester County, MD, Kent County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Worcester County, MD, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ, Salem County, NJ, Accomack County, VA, Brunswick County, VA, Charles City County, VA, Chesterfield County, VA, City of Chesapeake, VA, City of Colonial Heights, VA, City of Emporia, VA, City of Franklin, VA, City of Hampton, VA, City of Hopewell, VA, City of Newport News, VA, City of Norfolk, VA, City of Petersburg, VA, City of Poquoson, VA, City of Portsmouth, VA, City of Richmond, VA, City of Suffolk, VA, City of Virginia Beach, VA, City of Williamsburg, VA, Dinwiddie County, VA, Essex County, VA, Gloucester County, VA, Greensville County, VA, Hanover County, VA, Henrico County, VA, Isle of Wight County, VA, James City County, VA, King and Queen County, VA, King William County, VA, Lancaster County, VA, Lunenburg County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, New Kent County, VA, Northampton County, VA, Northumberland County, VA, Nottoway County, VA, Prince George County, VA, Richmond County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 103 km from the middle of the area, began a volume at 22:04 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.

Warnings issued inside it

13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Apr 28, 6:01 PM EDTSevere Thunderstorm WarningAKQLunenburg44 min
Apr 28, 6:42 PM EDTSevere Thunderstorm WarningAKQLunenburg28 min
Apr 28, 6:45 PM EDTSevere Thunderstorm WarningAKQDinwiddie45 min
Apr 28, 6:48 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Calvert, Charles, Prince George's42 min
Apr 28, 6:53 PM EDTSevere Thunderstorm WarningAKQMecklenburg47 min
Apr 28, 7:01 PM EDTSevere Thunderstorm WarningAKQBrunswick44 min
Apr 28, 7:02 PM EDTTornado WarningLWXCalvert, Charles, Prince George's, Saint Mary's43 min
Apr 28, 7:34 PM EDTSevere Thunderstorm WarningAKQGreensville, City of Emporia31 min
Apr 28, 7:44 PM EDTTornado WarningAKQDorchester46 min
Apr 28, 7:44 PM EDTTornado WarningLWXCalvert31 min
Apr 28, 7:59 PM EDTSevere Thunderstorm WarningAKQSouthampton, City of Franklin31 min
Apr 28, 8:21 PM EDTTornado WarningAKQWicomico44 min
Apr 28, 9:09 PM EDTSevere Thunderstorm WarningAKQWorcester46 min

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.0 hours before the alert went out and 93 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, Wallops Is Stn, VA at 12:00Z on 2002-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 23 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2002-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 394 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
23 J/kg
Mixed-layer CIN
-94 J/kg
Mixed-layer LCL
468 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
394 m²/s²
0-3 km storm-relative helicity
418 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000
WWUS20 KWNS 282201
SEL7  
SPC WW 282157
DEZ000-MDZ000-NJZ000-VAZ000-CWZ000-290200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 177
STORM PREDICTION CENTER NORMAN OK
557 PM EDT SUN APR 28 2002

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   DELAWARE                           
   EASTERN MARYLAND                           
   SOUTHERN NEW JERSEY                         
   EASTERN VIRGINIA                           
   AND ADJACENT COASTAL WATERS                     

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 600 PM UNTIL 1000
PM EDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 65 MILES SOUTH OF RICHMOND VIRGINIA TO 15 MILES
NORTH NORTHEAST OF ATLANTIC CITY NEW JERSEY.

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 169...WW 171...WW
172...WW 173...WW 174...WW 175...WW 176...

DISCUSSION...CLUSTERS AND LINES OF SEVERE STORMS OVER PA/VA WILL
CONTINUE TO TRACK EASTWARD TOWARD THE MID ATLANTIC COAST DURING THE
EVENING.  AIRMASS HAS DESTABILIZED ALL THE WAY TO THE
COAST...INDICATING A SUSTAINED SEVERE THREAT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 27035.

...HART

393,0730 363,0755 363,0783 393,0755

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 28, 1:30 PM EDTTornado WatchSPCAllegany, Garrett4 hr
Apr 28, 3:30 PM EDTTornado WatchSPCBaltimore, Carroll, Frederick, Harford, Howard, Montgomery and 3 more6 hr
Apr 28, 5:00 PM EDTSevere Thunderstorm WatchSPCAllegany, Garrett4 hr
Apr 28, 5:00 PM EDTSevere Thunderstorm WatchSPCAllegany, Garrett4 hr
Apr 28, 5:00 PM EDTSevere Thunderstorm WatchSPCHunterdon, Morris, Passaic, Somerset, Sussex, Warren5 hr
Apr 28, 2:15 PM EDTTornado WatchSPCCity of Bristol5 hr
Apr 28, 6:45 PM EDTTornado WatchSPCCity of Danville3 hr

Nearby

Tornado Watches in Virginia, 2002Tornado Watches in Maryland, 2002Tornado Watches in New Jersey, 2002Every tornado watch in 2002

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.