Alert archive / Maryland / Tornado Watches in 2006
Tornado Watch 343
The Storm Prediction Center issued this tornado watch at May 11, 2006, 6:19 PM EDT for 20 counties in Maryland; Lancaster County, York County, Pennsylvania; 10 counties in Virginia. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 11, 2006, 6:19 PM EDT (22:19 UTC)
- Expired
- May 11, 2006, 11:00 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 32 counties
Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Cecil County, MD, Charles County, MD, City of Baltimore, MD, Dorchester County, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Queen Anne's County, MD, Saint Mary's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Lancaster County, PA, York County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Manassas, VA, City of Manassas Park, VA, Fairfax County, VA, Fauquier County, VA, Loudoun County, VA, Prince William County, VA
The radar
The Sterling radar (KLWX), 50 km from the middle of the area, began a volume at 22:19 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
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 6:32 PM EDT | Tornado Warning | LWX | Charles | 28 min |
| May 11, 6:55 PM EDT | Tornado Warning | LWX | Charles, Prince George's | 35 min |
| May 11, 7:02 PM EDT | Tornado Warning | LWX | Charles | 28 min |
| May 11, 7:45 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 18 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.3 hours before the alert went out and 43 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 567 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 10:23 AM EDT | Mesoscale Discussion | SPC | Allegany, Garrett | 2 hr |
| May 11, 2:57 PM EDT | Mesoscale Discussion | SPC | Charles, Montgomery, Prince George's, Saint Mary's | 2 hr |
| May 11, 5:46 PM EDT | Mesoscale Discussion | SPC | Anne Arundel, Baltimore, Calvert, Carroll, Cecil, Charles and 9 more | 59 min |
| May 11, 4:02 PM EDT | Tornado Watch | SPC | Albemarle, Amelia, Brunswick, Caroline, Charles City, Chesterfield and 55 more | 6 hr |
Nearby
Tornado Watches in Maryland, 2006Tornado Watches in Virginia, 2006Tornado Watches in Pennsylvania, 2006Every tornado watch in 2006
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.