Alert archive / Virginia / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 11, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Apr 21, 2000, 1:32 PM EDT for 4 counties in Virginia. It was in force for 43 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
- Apr 21, 2000, 1:32 PM EDT (17:32 UTC)
- Expired
- Apr 21, 2000, 2:15 PM EDT
- In force
- 43 min
- Issued by
- NWS Baltimore/Washington
- Area
- Whole counties
Counties Culpeper County, VA, Fauquier County, VA, Spotsylvania County, VA, Stafford County, VA
The radar
The Sterling radar (KLWX), 61 km from the middle of the area, began a volume at 17:34 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 |
|---|---|---|---|
| Apr 21, 12:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.5 hours before the alert went out and 61 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, 10:40 AM EDT, 2 hours 52 minutes earlier.
Area forecast discussion, Apr 21, 10:40 AM EDT, 2 hours 52 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON 1040 AM EDT THU APR 20 2000 PREV FCST HAS GUD HANDLE ON AFTN WX SITN. MANY FAVORABLE FACTORS WL BE PRESENT TO SUPPORT TSTMS AND PSBL SVR TSTMS. A VORT MX ROTATING ARND OH VLLY CUTOFF LOW WL MOV OUT OF ERN TN VLLY AND INTO THE WRN FA BY 18Z. CLRG HAS BN OCCURRING OVR WRN PTNS OF FA THIS AM CONSISTENT W/DRY SLOT PROGGED BY LAST FEW MDL RUNS. AT 300 MB...MLDS DID NOT CAPTURE PSN OF 95 KT JET. MDLS HAD JET CNTRD TOO FAR W OF ITS ACTUAL 12Z PSN OVR GA. SO...FAIRLY STG JET WL BE MOVG INTO FA THIS AFTN AND RGN WL BE UNDER LF QUAD. AS UPR LOW HEADS EWD...ATMOS WL CONT TO DESTABILIZE. MODIFIED AM SDNG GIVES LI OF -5 DEG C. IN ADDITION...SDNG HAD GUD VEERING IN LOW LVLS AND SRH WAS 221 M/SEC2. SFC DWPTS WERE IN 50S TO LOWER 60S THIS AM AND 850 MB PLOT SHOWED PLENTY OF RH. SFC LOW HAS FORMED NR CHO THIS AM. PRESENCE OF LOW MAY KEEP NRN FA IN THE CLDS THIS AFTN WHICH WUD INHIBIT INSTAB SOMEWHAT. IN SRN FA HOWEVER...LOW WL INCR UVV/S. THINK BEST CHC FOR SVR WX WL BE IN SW ZONES DUE TO CLRG...SFC LOW AND PROXIMITY OF UPR DYNAMICS. HOWEVER...EXPECT ENTR FA TO HV TSTMS THIS AF]TN. LOW WL BE STACKED OVHD TONIGHT AND LINGER ON SAT WHICH WL PROLONG THE PCPN. .LWX...SCA MD PTN CHES BAY AND POTOMAC. ARTHUR
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 4:39 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 36 min |
| Apr 21, 5:05 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel, Baltimore, City of Baltimore | 55 min |
Nearby
Severe Thunderstorm Warnings in Virginia, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.