Alert archive / Maryland / Tornado Watches in 1998
Tornado Watch 152
The Storm Prediction Center issued this tornado watch at Apr 1, 1998, 7:15 PM EST for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 1, 1998, 7:15 PM EST (00:15 UTC)
- Expired
- Apr 2, 1998, 12:00 AM EST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 57 counties
Kent County, DE, New Castle County, DE, Sussex County, DE, 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, Worcester County, MD, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Adams County, PA, Chester County, PA, Delaware County, PA, Lancaster County, PA, Montgomery County, PA, Philadelphia County, PA, York County, PA, Accomack County, VA, Arlington County, VA, Caroline County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Manassas, VA, City of Manassas Park, VA, Essex County, VA, Fairfax County, VA, Hanover County, VA, King George County, VA, Louisa County, VA, Northumberland County, VA, Prince William County, VA, Richmond County, VA, Spotsylvania County, VA, Stafford County, VA, Westmoreland County, VA
The radar
The Sterling radar (KLWX), 79 km from the middle of the area, began a volume at 00:18 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
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 1, 7:43 PM EST | Tornado Warning | AKQ | Essex, King and Queen | 32 min |
| Apr 1, 7:44 PM EST | Severe Thunderstorm Warning | CTP | Lancaster, York | 61 min |
| Apr 1, 8:10 PM EST | Flash Flood Warning | PHI | Chester, Montgomery | 110 min |
| Apr 1, 8:16 PM EST | Tornado Warning | AKQ | Essex, Richmond | 29 min |
| Apr 1, 8:32 PM EST | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 48 min |
| Apr 1, 8:39 PM EST | Severe Thunderstorm Warning | LWX | Prince George's | 31 min |
| Apr 1, 9:03 PM EST | Severe Thunderstorm Warning | LWX | Anne Arundel | 32 min |
| Apr 1, 9:06 PM EST | Severe Thunderstorm Warning | PHI | Cecil | 49 min |
| Apr 1, 9:43 PM EST | Severe Thunderstorm Warning | PHI | New Castle | 32 min |
| Apr 1, 9:56 PM EST | Flash Flood Warning | PHI | Chester, Montgomery | 2 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.3 hours before the alert went out and 71 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
- 1170 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 817 m above ground
- 0-6 km bulk shear
- 80 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
Nearby
Tornado Watches in Maryland, 1998Tornado Watches in Virginia, 1998Tornado Watches in Pennsylvania, 1998Every tornado watch in 1998
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.