Alert archive / Virginia / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 151, NWS Baltimore/Washington

June 26, 2000Loudoun County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 26, 2000, 5:02 PM EDT for Loudoun County, 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 outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jun 26, 2000, 5:02 PM EDT (21:02 UTC)
Expired: Jun 26, 2000, 5:45 PM EDT
In force: 43 min
Issued by: NWS Baltimore/Washington
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Loudoun County, VA

The radar

The Sterling radar (KLWX), 15 km from the middle of the area, began a volume at 21:02 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.0 hours before the alert went out and 23 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 130 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 979 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS51 KLWX 262102
SVRWBC
VAC107-262145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
502 PM EDT MON JUN 26 2000

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LOUDOUN COUNTY IN NORTHERN VIRGINIA

* UNTIL 545 PM EDT

* AT 502 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER MIDDLEBURG...MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  9 MILES SOUTH OF LEESBURG AT 508 PM
  OVER ARCOLA AT 510 PM

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN
EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

AS THE STORM APPROACHES MOVE TO A PLACE OF SAFETY. TUNE INTO NOAA
WEATHER RADIO OR YOUR LOCAL RADIO OR TV STATION FOR THE LATEST
WEATHER INFORMATION.

LAT...LON 3908 7774 3890 7775 3887 7753 3918 7750

DMW/JA

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 Jun 26, 2:30 PM EDT, 2 hours 32 minutes earlier.

Area forecast discussion, Jun 26, 2:30 PM EDT, 2 hours 32 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
230 PM EDT MON JUN 26 2000

MDL GUIDANCE LATE THIS AFTRN AND USING ICWF...SO FCST BASED ON 00Z
CYCLE WITH LAST MINUTE INPUT FROM WHAT IS AVBL FROM THE 12Z CYCLE.

ATMS OVR THE AREA CONTS UNSTABLE THIS AFT. NO SYNOPTIC SCALE TRIGGER
TO ACT ON. HOWEVER...ISOLD/SCT CNVCTN PSBL THRU EARLY EVE ALONG
MESOSCALE FEATURES AND OVR MTNS WHERE OROGRAPHIC LIFT WL ENHANCE
DVLPMT. AFTER SUNSET...EXPECT ACTIVITY TO DIE OFF AND BE GONE BY
MIDNGT.

LOOKS LIKE A BETTER CHC OF MORE ORGANIZED CONVECTION ON TUE. SHRTWV
MVS TOWARD THE AREA FM W. THE ASSOCD SFC BNDRY APPROACHES DURING THE
AFT/EVE HRS. WILL CONTINUE WITH THE IDEA OF LIKELY POPS. WL WORD IT
AS AFT/EVE OVR THE MTNS AND LATE AFT/EVE E OF THE MTNS. SFC BNDRY
GETS HUNG UP OVR THE AREA TUE NIGHT AND WED AS IT BECOMES PARALLEL
TO UPR LVL FLO SO WL KEEP POPS IN FCST INTO 4TH PD.

FCSTID = 15

.LW!X...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 25, 8:52 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax	38 min
Jun 25, 11:48 PM EDT	Flash Flood Warning	LWX	Fauquier, Loudoun	117 min
Jun 26, 2:34 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, City of Charlottesville	41 min
Jun 26, 2:34 PM EDT	Severe Thunderstorm Warning	LWX	Orange	41 min
Jun 26, 3:17 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, Prince William, City of Manassas, City of Manassas Park	43 min
Jun 26, 3:59 PM EDT	Severe Thunderstorm Warning	LWX	Spotsylvania, Stafford, City of Fredericksburg	31 min
Jun 26, 4:08 PM EDT	Severe Thunderstorm Warning	LWX	Nelson	52 min
Jun 26, 4:18 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, Loudoun	42 min
Jun 26, 4:30 PM EDT	Severe Thunderstorm Warning	LWX	Spotsylvania, Stafford, City of Fredericksburg	45 min
Jun 26, 4:30 PM EDT	Severe Thunderstorm Warning	LWX	King George	45 min
Jun 26, 6:33 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, City of Winchester	57 min
Jun 26, 6:33 PM EDT	Severe Thunderstorm Warning	LWX	Clarke	57 min
Jun 26, 6:53 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, Loudoun	52 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2000 Every 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.