Alert archive / Virginia / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 201, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 16, 2000, 6:41 PM EDT for Fairfax County, Loudoun County, Virginia. It was in force for 49 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
- Jul 16, 2000, 6:41 PM EDT (22:41 UTC)
- Expired
- Jul 16, 2000, 7:30 PM EDT
- In force
- 49 min
- Issued by
- NWS Baltimore/Washington
- Area
- Whole counties
Counties Fairfax County, VA, Loudoun County, VA
The radar
The Sterling radar (KLWX), 3 km from the middle of the area, began a volume at 22:42 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 |
|---|---|---|---|
| Jul 16, 7:05 PM EDT | Thunderstorm Wind | Leesburg, VA | Trees were downed onto White's Ferry Road. |
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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 10.7 hours before the alert went out and 5 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
- 780 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 885 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KLWX 162242 SVRWBC VAC059-107-162330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 641 PM EDT SUN JUL 16 2000 THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN FAIRFAX COUNTY IN NORTHERN VIRGINIA NORTHERN AND EASTERN LOUDOUN COUNTY IN NORTHERN VIRGINIA * UNTIL 730 PM EDT * AT 637 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER HERNDON...MOVING NORTHEAST AT 10 MPH. * THE SEVERE THUNDERSTORM WILL BE... 4 MILES NORTHWEST OF GREAT FALLS AT 648 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. HAIL UP TO DIME SIZE HAS BEEN REPORTED WITH THIS STORM IN STERLING AT 635 PM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER. 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. JLW
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 Jul 16, 2:40 PM EDT, 4 hours 1 minute earlier.
Area forecast discussion, Jul 16, 2:40 PM EDT, 4 hours 1 minute before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON 240 PM EDT SUN JUL 16 2000 SCATTERED SHOWERS AND THUNDERSTORMS ACROSS THE LWX CWA AT TIME... A LITTLE STRONGER AND BETTER ORGANIZED OVER THE EAST THAN THE WEST. UPPER LOW STILL ROTATING JUST TO OUR NORTHWEST... AND ASSOCIATED THERMAL TROUGH SHOULD KEEP STORMS FIRING THROUGH THE EVENING HOURS. 12Z ETA/NGM AND AVN ALL AGREE IN FILLING IN UPPER LOW A BIT... AND EJECTING IT OFF TO THE ENE AS THE NIGHT GOES ON. FEEL THAT PRECIP SHOULD COME TO AN END BY THE MIDNIGHT HOUR FOR THE FAR WEST... AND OVERNIGHT FOR CHO AND DCA. NGM/AVN STILL HAVE 700 MB TROUGH OVER THE COUNTIES ALONG THE BAY AT 12Z TOMORROW... SO WILL ADD A CHANCE OF EARLY MORNING SHOWERS FROM BWI TO NHK. W/NW FLOW BUILDING IN FOR A WHILE TOMORROW SHOULD DRY THINGS OUT A LITTLE BIT AT THE SURFACE... WHILE INCREASING MID LEVEL TEMPS PUT A CAP TO ANY AFTERNOON CONVECTION. EXPECTING A MOSTLY CLEAR NIGHT MONDAY NIGHT. A WEAK COLD FRONT WILL DROP DOWN THROUGH THE AREA LATE ON TUESDAY. FWC/FAN GUIDANCE POPS RATHER LOW.. BUT MODEL SOUNDINGS INDICATE A MODERATELY UNSTABLE ATMOSPHERE IN PLACE IN THE AFTERNOON... AT LEAST UNSTABLE ENOUGH TO KEEP A MENTION OF SHOWERS AND STORMS ALONG WITH THE COLD FRONT. FWC TEMPS WARM PRETTY QUICKLY OVER THE NEXT COUPLE OF DAYS.. WHILE FAN TEMPS A LITTLE LESS AGRESSIVE. WILL STICK CLOSER TO FAN TEMPS. .LWX... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARGRAF!
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.