Alert archive / Virginia / Severe Thunderstorm Watches in 1997
Severe Thunderstorm Watch 470
The Storm Prediction Center issued this severe thunderstorm watch at Jun 18, 1997, 4:00 PM EDT for 5 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 18, 1997, 4:00 PM EDT (20:00 UTC)
- Expired
- Jun 18, 1997, 10:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 86 counties
Baltimore County, MD, City of Baltimore, MD, Frederick County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Alleghany County, NC, Ashe County, NC, Surry County, NC, Johnson County, TN, Albemarle County, VA, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Arlington County, VA, Augusta County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, Carroll County, VA, City of Alexandria, VA, City of Buena Vista, VA, City of Charlottesville, VA, City of Covington, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Galax, VA, City of Harrisonburg, VA, City of Lexington, VA, City of Lynchburg, VA, City of Manassas, VA, City of Manassas Park, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Craig County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Floyd County, VA, Fluvanna County, VA, Franklin County, VA, Frederick County, VA, Giles County, VA, Grayson County, VA, Greene County, VA, Henry County, VA, Highland County, VA, Loudoun County, VA, Louisa County, VA, Madison County, VA, Montgomery County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Patrick County, VA, Pittsylvania County, VA, Prince William County, VA, Pulaski County, VA, Rappahannock County, VA, Roanoke County, VA, Rockbridge County, VA, Rockingham County, VA, Shenandoah County, VA, Smyth County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Wythe County, VA, Berkeley County, WV, Greenbrier County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mercer County, WV, Monroe County, WV, Pendleton County, WV
The radar
The Roanoke radar (KFCX), 81 km from the middle of the area, began a volume at 20:01 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
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 4:29 PM EDT | Tornado Warning | LWX | Frederick, Shenandoah | 31 min |
| Jun 18, 4:41 PM EDT | Severe Thunderstorm Warning | LWX | Warren | 49 min |
| Jun 18, 4:47 PM EDT | Tornado Warning | LWX | Clarke | 33 min |
| Jun 18, 5:01 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 59 min |
| Jun 18, 5:06 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier | 49 min |
| Jun 18, 5:15 PM EDT | Tornado Warning | LWX | Loudoun | 30 min |
| Jun 18, 5:26 PM EDT | Flash Flood Warning | LWX | Frederick, Shenandoah | 59 min |
| Jun 18, 5:26 PM EDT | Flash Flood Warning | LWX | Clarke | 59 min |
| Jun 18, 5:33 PM EDT | Tornado Warning | LWX | Loudoun | 47 min |
| Jun 18, 5:50 PM EDT | Flash Flood Warning | LWX | Loudoun | 2 hr |
| Jun 18, 6:02 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 33 min |
| Jun 18, 6:10 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 60 min |
| Jun 18, 6:34 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 31 min |
| Jun 18, 6:46 PM EDT | Tornado Warning | LWX | Fauquier, Prince William | 49 min |
| Jun 18, 6:52 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 48 min |
| Jun 18, 6:52 PM EDT | Severe Thunderstorm Warning | LWX | Arlington, City of Falls Church | 48 min |
| Jun 18, 7:37 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, City of Fairfax | 63 min |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.0 hours before the alert went out and 254 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
- 392 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 671 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 219 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.4
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 2:30 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Garrett | 6 hr |
| Jun 18, 5:30 PM EDT | Severe Thunderstorm Watch | SPC | Washington | 6 hr |
| Jun 18, 7:15 PM EDT | Tornado Watch | SPC | Anne Arundel, Calvert, Caroline, Cecil, Charles, Dorchester and 10 more | 5 hr |
| Jun 18, 4:30 PM EDT | Severe Thunderstorm Watch | SPC | Anson, Beaufort, Bladen, Brunswick, Carteret, Columbus and 24 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Virginia, 1997Severe Thunderstorm Watches in West Virginia, 1997Severe Thunderstorm Watches in Maryland, 1997Every severe thunderstorm watch in 1997
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.