Alert archive / Virginia / Mesoscale Discussions in 2003

Mesoscale Discussion 2287

August 27, 200314 counties in Maryland; 26 counties in Virginia; 7 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Aug 27, 2003, 2:10 PM EDT for 14 counties in Maryland; 26 counties in Virginia; 7 counties in West Virginia. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
Aug 27, 2003, 2:10 PM EDT (18:10 UTC)
Expired
Aug 27, 2003, 3:15 PM EDT
In force
65 min
Issued by
the Storm Prediction Center
All 47 counties

Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Carroll County, MD, Charles County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Saint Mary's County, MD, Washington County, MD, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, King George County, VA, Loudoun County, VA, Madison County, VA, Orange County, VA, Page County, VA, Prince William County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Stafford County, VA, Warren County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV

The radar

The Sterling radar (KLWX), 56 km from the middle of the area, began a volume at 18:09 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.2 hours before the alert went out and 62 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 2003-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 483 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 2003-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.193958Sfc1 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
483 J/kg
Mixed-layer CIN
-236 J/kg
Mixed-layer LCL
1264 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 26, 9:20 PM EDTSevere Thunderstorm WatchSPCAllegany, Garrett6 hr
Aug 26, 10:18 PM EDTMesoscale DiscussionSPCAllegany, Garrett57 min
Aug 27, 12:22 AM EDTMesoscale DiscussionSPCCharles53 min
Aug 27, 6:11 AM EDTMesoscale DiscussionSPCAllegany, Garrett, Washington2 hr
Aug 27, 9:23 AM EDTMesoscale DiscussionSPCAllegany, Anne Arundel, Baltimore, Calvert, Caroline, Carroll and 17 more2 hr
Aug 27, 9:40 AM EDTSevere Thunderstorm WatchSPCHarford5 hr
Aug 27, 10:35 AM EDTSevere Thunderstorm WatchSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more5 hr
Aug 27, 3:09 PM EDTMesoscale DiscussionSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Frederick and 7 more66 min
Aug 27, 3:30 PM EDTSevere Thunderstorm WatchSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 9 more7 hr
Aug 27, 5:03 PM EDTMesoscale DiscussionSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 10 more87 min
Aug 27, 6:56 PM EDTMesoscale DiscussionSPCAnne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil and 15 more64 min
Aug 27, 7:30 PM EDTSevere Thunderstorm WatchSPCCaroline, Cecil, Dorchester, Kent, Queen Anne's, Somerset and 3 more4 hr
Aug 27, 12:52 PM EDTMesoscale DiscussionSPCBarbour, Braxton, Cabell, Calhoun, Clay, Doddridge and 16 more113 min
Aug 27, 2:05 PM EDTSevere Thunderstorm WatchSPCBarbour, Braxton, Brooke, Cabell, Calhoun, Clay and 23 more5 hr

Nearby

Mesoscale Discussions in Virginia, 2003Mesoscale Discussions in Maryland, 2003Mesoscale Discussions in West Virginia, 2003Every mesoscale discussion in 2003

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.