Alert archive / Maryland / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 18, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Apr 21, 2000, 4:39 PM EDT for Prince George's County, Maryland. It was in force for 36 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 21, 2000, 4:39 PM EDT (20:39 UTC)
- Expired
- Apr 21, 2000, 5:15 PM EDT
- In force
- 36 min
- Issued by
- NWS Baltimore/Washington
- Area
- Whole counties
County Prince George's County, MD
The radar
The Sterling radar (KLWX), 58 km from the middle of the area, began a volume at 20:39 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 21, 5:00 PM EDT | Hail 0.88 | Rosaryville, MD | Nickel sized hail fell. |
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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 21, 12:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.7 hours before the alert went out and 50 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
- 626 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 230 m²/s²
- 0-3 km storm-relative helicity
- 254 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 21, 2:45 PM EDT, 1 hour 54 minutes earlier.
Area forecast discussion, Apr 21, 2:45 PM EDT, 1 hour 54 minutes before
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</html>The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 1:32 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Fauquier, Spotsylvania, Stafford | 43 min |
| Apr 21, 2:10 PM EDT | Severe Thunderstorm Warning | LWX | Prince William | 50 min |
| Apr 21, 2:21 PM EDT | Severe Thunderstorm Warning | LWX | Spotsylvania, City of Fredericksburg | 24 min |
| Apr 21, 2:10 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 50 min |
| Apr 21, 2:33 PM EDT | Tornado Warning | LWX | Charles | 27 min |
| Apr 21, 3:03 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Prince George's | 57 min |
| Apr 21, 3:03 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 57 min |
| Apr 21, 4:16 PM EDT | Severe Thunderstorm Warning | LWX | Howard, Montgomery | 59 min |
| Apr 21, 5:05 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 55 min |
Nearby
Severe Thunderstorm Warnings in Maryland, 2000Every severe thunderstorm warning in 2000
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.