Alert archive / Maryland / Severe Thunderstorm Warnings in 2014
Severe Thunderstorm Warning 248, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Sep 6, 2014, 5:15 PM EDT for Frederick County, Washington County, Maryland; Berkeley County, West Virginia. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 6, 2014, 5:15 PM EDT (21:15 UTC)
- Expired
- Sep 6, 2014, 6:00 PM EDT
- In force
- 45 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
Counties Frederick County, MD, Washington County, MD, Berkeley County, WV
The radar
The Sterling radar (KLWX), 64 km from the middle of the area, began a volume at 21:15 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 6, 2:07 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 9.3 hours before the alert went out and 69 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
- 1444 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 867 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 1:23 PM EDT | Small Craft Advisory | LWX | 25 hr | |
| Sep 6, 6:17 PM EDT | Severe Thunderstorm Warning | LWX | Clarke, Fauquier, Loudoun, Warren | 43 min |
| Sep 6, 6:40 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax | 50 min |
| Sep 6, 6:54 PM EDT | Special Marine Warning | LWX | 66 min | |
| Sep 6, 6:57 PM EDT | Special Marine Warning | LWX | 93 min | |
| Sep 6, 7:22 PM EDT | Areal Flood Warning | LWX | Arlington, Fairfax, City of Fairfax, City of Falls Church | 113 min |
| Sep 6, 7:35 PM EDT | Special Marine Warning | LWX | 55 min | |
| Sep 6, 7:45 PM EDT | Special Marine Warning | LWX | 90 min | |
| Sep 6, 7:51 PM EDT | Special Marine Warning | LWX | 54 min | |
| Sep 6, 1:57 PM EDT | Severe Thunderstorm Warning | LWX | Washington | 28 min |
| Sep 6, 5:25 PM EDT | Severe Thunderstorm Warning | LWX | Frederick, Washington | 50 min |
| Sep 6, 7:36 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, Harford, Howard, City of Baltimore | 39 min |
| Sep 6, 3:51 PM EDT | Severe Thunderstorm Warning | LWX | Grant, Hampshire, Hardy, Mineral | 24 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2014Severe Thunderstorm Warnings in West Virginia, 2014Every severe thunderstorm warning in 2014
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.