Alert archive / Maryland / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 291
The Storm Prediction Center issued this severe thunderstorm watch at May 12, 2002, 5:15 PM EDT for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 12, 2002, 5:15 PM EDT (21:15 UTC)
- Expired
- May 12, 2002, 10:00 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 37 counties
Kent County, DE, New Castle County, DE, Anne Arundel County, MD, Baltimore County, MD, Caroline County, MD, Cecil County, MD, City of Baltimore, MD, Harford County, MD, Howard County, MD, Kent County, MD, Montgomery County, MD, Prince George's County, MD, Queen Anne's County, MD, Talbot County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Mercer County, NJ, Monmouth County, NJ, Ocean County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia 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, Prince William County, VA
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 12, 5:32 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 43 min |
| May 12, 5:40 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 35 min |
| May 12, 5:42 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 33 min |
| May 12, 6:08 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 37 min |
| May 12, 6:19 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Philadelphia | 26 min |
| May 12, 6:23 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 52 min |
| May 12, 6:33 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland, Salem | 42 min |
| May 12, 6:39 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 51 min |
| May 12, 6:45 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester | 45 min |
| May 12, 7:12 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 33 min |
| May 12, 7:24 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery | 21 min |
| May 12, 7:43 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Howard, Montgomery, Prince George's | 47 min |
| May 12, 7:53 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Montgomery | 22 min |
| May 12, 8:07 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 38 min |
| May 12, 8:58 PM EDT | Severe Thunderstorm Warning | LWX | Montgomery, Prince George's | 47 min |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 9.3 hours before the alert went out and 128 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
- 1104 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 143 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 12, 3:30 PM EDT | Severe Thunderstorm Watch | SPC | New Castle | 6 hr |
| May 12, 10:45 AM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Bedford, Butler, Cambria and 11 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Maryland, 2002Severe Thunderstorm Watches in New Jersey, 2002Severe Thunderstorm Watches in Virginia, 2002Every severe thunderstorm watch in 2002
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.