Alert archive / Virginia / Tornado Warnings in 1993
Tornado Warning 4, NWS Baltimore/Washington
NWS Baltimore/Washington issued this tornado warning at Apr 16, 1993, 9:33 PM EDT for Loudoun County, Virginia. It was in force for 42 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 16, 1993, 9:33 PM EDT (01:33 UTC)
- Expired
- Apr 16, 1993, 10:15 PM EDT
- In force
- 42 min
- Issued by
- NWS Baltimore/Washington
- Area
- Whole counties
County Loudoun County, VA
The radar
The Sterling radar (KLWX), 18 km from the middle of the area, began a volume at 01:36 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 16, 9:35 PM EDT | Tornado F1 | Loudoun, VA | A tornado touched down approximately 0.5 mile southwest of Saint Louis in the southern part of Loudoun County, and moved east northeast for about 1.7 miles. The storm knocked down and damaged hundreds of trees. On the Innerhouse Farm, roofs of two barns were |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 1.6 hours before the alert went out and 26 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
- 372 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 626 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- -6 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.9
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 16, 8:13 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 47 min |
| Apr 16, 8:30 PM EDT | Tornado Warning | LWX | Loudoun | 30 min |
| Apr 16, 9:30 PM EDT | Flash Flood Warning | LWX | Fauquier, Loudoun | 2 hr |
| Apr 16, 9:56 PM EDT | Tornado Warning | LWX | Fauquier | 34 min |
| Apr 16, 11:17 PM EDT | Flash Flood Warning | LWX | Loudoun | 118 min |
| Apr 16, 9:00 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 45 min |
Nearby
Tornado Warnings in Virginia, 1993Every tornado warning in 1993Tornadoes in 1993
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.