Alert archive / Virginia / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 157
The Storm Prediction Center issued this severe thunderstorm watch at May 7, 2004, 4:35 PM EDT for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 7, 2004, 4:35 PM EDT (20:35 UTC)
- Expired
- May 7, 2004, 10:00 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 66 counties
Kent County, DE, Sussex County, DE, Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Caroline County, MD, Carroll County, MD, Charles County, MD, City of Baltimore, MD, Dorchester County, MD, Frederick County, MD, Garrett 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, Washington County, MD, Wicomico County, MD, Worcester County, MD, Cumberland County, NJ, 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, Highland 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, Barbour County, WV, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Monongalia County, WV, Morgan County, WV, Pendleton County, WV, Preston County, WV, Randolph County, WV, Taylor County, WV, Tucker County, WV
The radar
The Sterling radar (KLWX), 57 km from the middle of the area, began a volume at 20:35 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
19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 4:40 PM EDT | Severe Thunderstorm Warning | RLX | Randolph | 50 min |
| May 7, 4:44 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Shenandoah | 46 min |
| May 7, 5:08 PM EDT | Severe Thunderstorm Warning | LWX | Grant, Pendleton | 52 min |
| May 7, 5:17 PM EDT | Severe Thunderstorm Warning | LWX | Warren | 43 min |
| May 7, 5:33 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier, Rappahannock | 42 min |
| May 7, 5:35 PM EDT | Severe Thunderstorm Warning | LWX | Hardy | 40 min |
| May 7, 5:43 PM EDT | Severe Thunderstorm Warning | LWX | Hampshire, Mineral | 47 min |
| May 7, 5:53 PM EDT | Severe Thunderstorm Warning | LWX | Shenandoah | 52 min |
| May 7, 6:10 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper | 50 min |
| May 7, 6:14 PM EDT | Severe Thunderstorm Warning | LWX | Rappahannock | 31 min |
| May 7, 6:18 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier | 42 min |
| May 7, 6:40 PM EDT | Severe Thunderstorm Warning | LWX | Prince William | 65 min |
| May 7, 6:47 PM EDT | Severe Thunderstorm Warning | LWX | Stafford | 43 min |
| May 7, 7:07 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier | 23 min |
| May 7, 7:21 PM EDT | Severe Thunderstorm Warning | LWX | Orange, Spotsylvania, City of Fredericksburg | 39 min |
| May 7, 7:27 PM EDT | Severe Thunderstorm Warning | LWX | King George, Stafford | 33 min |
| May 7, 7:37 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 38 min |
| May 7, 7:46 PM EDT | Tornado Warning | LWX | King George | 14 min |
| May 7, 8:31 PM EDT | Severe Thunderstorm Warning | LWX | Saint Mary's | 29 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, 8.6 hours before the alert went out and 65 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
- 28 J/kg
- Mixed-layer CIN
- -314 J/kg
- Mixed-layer LCL
- 1566 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 184 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 10:29 AM EDT | Mesoscale Discussion | SPC | New Castle | 91 min |
| May 7, 1:24 PM EDT | Mesoscale Discussion | SPC | Kent, New Castle | 96 min |
| May 7, 1:40 PM EDT | Severe Thunderstorm Watch | SPC | Kent, New Castle, Sussex | 3 hr |
| May 7, 6:17 PM EDT | Mesoscale Discussion | SPC | Kent, Sussex | 118 min |
| May 7, 11:00 AM EDT | Severe Thunderstorm Watch | SPC | Allegany, Anne Arundel, Baltimore, Carroll, Frederick, Garrett and 5 more | 6 hr |
| May 7, 1:49 PM EDT | Mesoscale Discussion | SPC | Allegany, Garrett, Washington | 86 min |
| May 7, 7:02 PM EDT | Mesoscale Discussion | SPC | Caroline, Essex, Fluvanna, Gloucester, Goochland, Hanover and 13 more | 2 hr |
| May 7, 7:20 PM EDT | Severe Thunderstorm Watch | SPC | Accomack, Caroline, Essex, Gloucester, Hanover, King and Queen and 10 more | 4 hr |
Nearby
Severe Thunderstorm Watches in Virginia, 2004Severe Thunderstorm Watches in Maryland, 2004Severe Thunderstorm Watches in West Virginia, 2004Every severe thunderstorm watch 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.