Alert archive / Virginia / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 129, NWS Baltimore/Washington

June 1, 2004Arlington County, City of Alexandria, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 1, 2004, 2:47 PM EDT for Arlington County, City of Alexandria, Virginia. It was in force for 43 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
Jun 1, 2004, 2:47 PM EDT (18:47 UTC)
Expired
Jun 1, 2004, 3:30 PM EDT
In force
43 min
Issued by
NWS Baltimore/Washington
Area
Counties, with a storm outline in the text

Counties Arlington County, VA, City of Alexandria, VA

The radar

The Sterling radar (KLWX), 39 km from the middle of the area, began a volume at 18:49 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
Jun 1, 11:45 AM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.8 hours before the alert went out and 31 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, Washington/Dulle, VA at 12:00Z on 2004-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 16 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, Washington/Dulle, VA at 12:00Z on 2004-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -20 square meters per square second.1939587897117Sfc1 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
16 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
1462 m above ground
0-6 km bulk shear
72 kt
0-1 km storm-relative helicity
-20 m²/s²
0-3 km storm-relative helicity
-4 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 Baltimore/Washington wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 1, 12:33 PM EDT, 2 hours 14 minutes earlier.

Area forecast discussion, Jun 1, 12:33 PM EDT, 2 hours 14 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1233 PM EDT TUE JUN 1 2004

UPDATED FCST FOR SVR TSTM WATCH VALID UNTIL 6PM EDT. STILL SOME
QUESTIONS ABT STORM CVRG GIVEN LACK OF LOW-LVL CONVERGENCE GIVEN
DOWNSLOPE WRLY FLOW. BEST CVRG STILL IN EXPECTED IN THE NORTH CLOSER
TO TRACK OF MCV AND IN AREA UNDER LFQ OF UPPER JET. LOW-LVL MOISTURE
IS LIMITED WITH TDS IN THE MID 50S. ONLY FVRBL FACTOR FOR SVR IS
COLD MID-LVL TEMPS NEAR -15C SUGGESTING LARGE HAIL IN STRONGEST
STORMS.

ROSA

.LONG TERM...WED-MON
OVERALL NOT TOO MANY CHANGES IN THE LONG TERM. A CHC OF RW/TRW WED
AFTN AND NIGHT AS THE UPR TROF/CD FNT MV THRU THE GRT LKS W/ A
FAIRLY STG JET PROGGED OVRHD. XPCT PCPN CHC THROUGH THU EVE...AND
THEN HIGH PRES BUILDS IN FOR DRIER CONDITIONS FRI AND SAT W/
SEASONABLE TEMPS. ZNL FLOW WI CHC POPS FOR NEXT MON W/ VORT MAX
PROGGED TO MV INTO CWA. ND

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.
MARINE...NONE.
Hazardous weather outlook, Jun 1, 12:31 PM EDT, 2 hours 16 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1231 PM EDT TUE JUN 1 2004

DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042-
050>057-WVZ048>055-020800-
ALBEMARLE VA-ALLEGANY MD-ANNE ARUNDEL MD-
ARLINGTON/FALLS CHURCH/ALEXANDRIA VA-AUGUSTA VA-BERKELEY WV-
CALVERT MD-CARROLL MD-CHARLES MD-CLARKE VA-CULPEPER VA-
DISTRICT OF COLUMBIA DC-FAIRFAX VA-FAUQUIER VA-FREDERICK VA-
FREDERICK MD-GRANT WV-GREENE VA-HAMPSHIRE WV-HARDY WV-HARFORD MD-
HIGHLAND VA-HOWARD MD-JEFFERSON WV-KING GEORGE VA-LOUDOUN VA-
MADISON VA-MINERAL WV-MONTGOMERY MD-MORGAN WV-NELSON VA-
NORTHERN BALTIMORE MD-ORANGE VA-PAGE VA-PENDLETON WV-
PRINCE GEORGES MD-PRINCE WILLIAM/MANASSAS/MANASSAS PARK VA-
RAPPAHANNOCK VA-ROCKINGHAM VA-SHENANDOAH VA-SOUTHERN BALTIMORE MD-
SPOTSYLVANIA VA-ST. MARYS MD-STAFFORD VA-WARREN VA-WASHINGTON MD-
1231 PM EDT TUE JUN 1 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MARYLAND WEST OF THE CHESAPEAKE
BAY AND EAST OF GARRETT COUNTY...EASTERN WEST VIRGINIA...NORTHERN AND
CENTRAL VIRGINIA AND WASHINGTON DC.

.DAY ONE...
A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR THE ENTIRE AREA.
THUNDERSTORMS ARE DEVELOPING ACROSS WEST VIRGINIA AND MOVING EAST.
SOME  OF THE STRONGER STORMS MAY PRODUCE GUSTY WINDS AND LARGE HAIL.

.DAYS TWO THROUGH SEVEN...
SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP WEDNESDAY AFTERNOON
AND EARLY THURSDAY. SOME OF THE STORMS MAY PRODUCE STRONG GUSTY WINDS
AND HAIL.

.SPOTTER INFORMATION STATEMENT...
SKYWARN HAS BEEN ACTIVATED. PLEASE RELAY REPORTS TO THE NWS.

ABW

In the hours before

Local storm report, Jun 1, 1:47 PM EDT, 1 hour before
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Special weather statement, Jun 1, 2:09 PM EDT, 38 minutes before
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The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 31, 8:13 PM EDTSevere Thunderstorm WarningLWXLoudoun32 min
May 31, 9:11 PM EDTSpecial Marine WarningLWX2 hr
May 31, 9:37 PM EDTSpecial Marine WarningLWX113 min
Jun 1, 1:35 PM EDTSevere Thunderstorm WarningLWXClarke, Frederick, City of Winchester55 min
Jun 1, 1:50 PM EDTSevere Thunderstorm WarningLWXLoudoun55 min
Jun 1, 2:16 PM EDTSpecial Marine WarningLWX119 min
Jun 1, 2:16 PM EDTSpecial Marine WarningLWX119 min
Jun 1, 2:16 PM EDTSpecial Marine WarningLWX119 min
Jun 1, 2:17 PM EDTSevere Thunderstorm WarningLWXFairfax, City of Fairfax, City of Falls Church58 min
Jun 1, 2:43 PM EDTSpecial Marine WarningLWX62 min
Jun 1, 3:41 PM EDTSpecial Marine WarningLWX49 min
Jun 1, 3:49 PM EDTSpecial Marine WarningLWX86 min
Jun 1, 4:15 PM EDTSpecial Marine WarningLWX45 min
Jun 1, 7:10 PM EDTSevere Thunderstorm WarningLWXHighland65 min
Jun 1, 2:37 PM EDTSevere Thunderstorm WarningLWXHoward53 min
Jun 1, 3:01 PM EDTSevere Thunderstorm WarningLWXPrince George's59 min
Jun 1, 3:10 PM EDTSevere Thunderstorm WarningLWXAnne Arundel65 min
Jun 1, 3:46 PM EDTSevere Thunderstorm WarningLWXHarford29 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2004Every severe thunderstorm warning in 2004

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.