Alert archive / Virginia / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 121, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 10, 2001, 5:20 PM EDT for Stafford County, Virginia. It was in force for 40 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
- Aug 10, 2001, 5:20 PM EDT (21:20 UTC)
- Expired
- Aug 10, 2001, 6:00 PM EDT
- In force
- 40 min
- Issued by
- NWS Baltimore/Washington
- Area
- Whole counties
County Stafford County, VA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 10, 5:24 PM EDT | Thunderstorm Wind | Falmouth, VA | Trees were downed near the intersection of Route 17 and Interstate 95. |
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, 9.3 hours before the alert went out and 59 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
- 1352 J/kg
- Mixed-layer CIN
- -85 J/kg
- Mixed-layer LCL
- 1323 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
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 Aug 10, 3:32 PM EDT, 1 hour 48 minutes earlier.
Area forecast discussion, Aug 10, 3:32 PM EDT, 1 hour 48 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON 332 PM EDT FRI AUG 10 2001 BUSY AFTERNOON DEVELOPING. HEAT WAVE WILL GIVE WAY TO SOME SVR ACTVTY...THEN A STATIONARY FRONT WILL LAST WELL INTO THE EXTENDED. HEAT ADV EAST OF THE BLUE RIDGE...AND EXCSVE HEAT WARN FOR THE CITIES WILL LIKELY CONT UNTIL THE NEXT UPDATE. TSTSM ACTVTY HAS BEEN DISORGNZED FOR THE MOST PART SO FAR. INSTAB IS VERY HIGH BUT SHR IS LOW. STATNTY CELLS DEF HAVE THE POTNTL FOR FLSH FLDDNG WITH HIGH PRECIP H20. STAT FRONT WILL WAVER AS SMALL IMPLSES MOVE NE ALONG IT. GENRNLY WILL BE A CHC OF SHRA AND TSRA FOR MOST OF THE EXNDED. STRONG FCSTID = 78 DCA 74 88 73 88 / 50 50 40 40 BWI 72 87 71 87 / 50 50 40 40 MRB 71 86 67 85 / 40 40 40 30 IAD 72 87 71 87 / 50 50 40 40 CHO 72 87 71 87 / 50 50 40 40 HGR 70 85 66 84 / 40 40 40 30 NHK 74 87 71 87 / 60 50 40 40 W99 71 86 67 85 / 40 40 40 30 .LWX... DC...EXCESSIVE HEAT WARNING FOR THIS AFTERNOON AND EVENING FOR ZONE DCZ001. MD...EXCESSIVE HEAT WARNING FOR THIS AFTERNOON AND EVENING FOR ZONE MDZ011. HEAT ADVISORY FOR THIS AFTERNOON AND EVENING FOR ZONES MDZ004>007... MDZ009>010...MDZ013>014...MDZ016>018. VA...HEAT ADVISORY FOR THIS AFTERNOON AND EVENING FOR ZONES VAZ036>042...VAZ050>057. WV...NONE.
In the hours before
Special weather statement, Aug 10, 2:11 PM EDT, 3 hours 9 minutes before
DCZ001-MDZ013-014-101815- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 211 PM EDT FRI AUG 10 2001 ...SCATTERED THUNDERSTORMS DEVELOPING ACROSS THE DISTRICT OF COLUMBIA INTO CENTRAL MARYLAND... AT 210 PM DOPPLER WEATHER RADAR INDICATED SCATTERED THUNDERSTORMS DEVELOPING FROM THE DISTRICT OF COLUMBIA EASTWARD ACROSS NORTHERN PRINCE GEORGES COUNTY MARYLAND INTO CENTRAL ANNE ARUNDEL COUNTY. THE THUNDERSTORMS ARE MOVING EAST-NORTHEAST AT 15 TO 20 MPH AND WILL AFFECT THE DISTRICT OF COLUMBIA...NORTHERN AND CENTRAL PRINCE GEORGES COUNTY AND ANNE ARUNDEL COUNTY DURING THE NEXT HOUR. THUNDERSTORMS COULD PRODUCE HEAVY RAIN...LIGHTNING AND WIND GUSTS TO 40 MPH. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER. DMW
Special weather statement, Aug 10, 2:28 PM EDT, 2 hours 52 minutes before
DCZ001-MDZ013-014-VAZ053-054-101830- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 228 PM EDT FRI AUG 10 2001 AT 225 PM DOPPLER WEATHER RADAR INDICATED SCATTERED THUNDERSTORMS EXTENDING FROM FAIRFAX CITY VIRGINIA ACROSS ARLINGTON COUNTY AND WASHINGTON DC INTO NORTHERN PRINCE GEORGES THEN EASTWARD TO NEAR CROFTON AND ARNOLD IN ANNE ARUNDEL COUNTY. THESE STORMS WERE MOVING EAST-NORTHEAST AT 15 TO 20 MPH AND WILL LIKELY PRODUCE HEAVY RAIN...LIGHTNING AND WIND GUSTS TO 40 MPH. IF THREATENING WEATHER APPROACHES...SEEK SAFE SHELTER. DMW
Special weather statement, Aug 10, 2:54 PM EDT, 2 hours 26 minutes before
DCZ001-MDZ013-014-VAZ053-054-101945- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 254 PM EDT FRI AUG 10 2001 AT 250 PM DOPPLER WEATHER RADAR INDICATED SCATTERED THUNDERSTORMS EXTENDING FROM FAIRFAX CITY VIRGINIA ACROSS ARLINGTON COUNTY AND WASHINGTON DC INTO NORTHERN PRINCE GEORGES COUNTY THEN EASTWARD TO NEAR CROFTON AND ARNOLD IN ANNE ARUNDEL COUNTY. THE INDIVIDUAL STORMS WERE MOVING EAST-NORTHEAST AT 15 TO 20 MPH BUT THE LINE OF STORMS WAS NEARLY STATIONARY. THESE THUNDERSTORMS WILL PRODUCE HEAVY RAIN...LIGHTNING AND WIND GUSTS TO 40 MPH. HEAVY RAIN MAY RESULT IN FLOODING OF LOW LYING AND POOR DRAINAGE AREAS. NEVER TRY TO CROSS A FLOODED ROAD. THE WATER DEPTH MAY BE TOO GREAT TO CROSS SAFELY. IF THREATENING WEATHER APPROACHES...SEEK SAFE SHELTER. DMW
Special weather statement, Aug 10, 4:10 PM EDT, 1 hour 10 minutes before
DCZ001-MDZ006-007-011-013-014-VAZ026>031-038>042-051>054-102100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON 410 PM EDT FRI AUG 10 2001 AT 405 PM DOPPLER WEATHER RADAR INDICATED SCATTERED THUNDERSTORMS EXTENDING FROM EASTERN FAIRFAX COUNTY ACROSS ARLINGTON...THE DISTRICT OF COLUMBIA...PRINCE GEORGES COUNTY AND ANNE ARUNDEL COUNTY. THESE STORMS ARE MOVING EAST AT 20 MPH AND WILL AFFECT THE AREA BETWEEN WASHINGTON DC AND THE CHESAPEAKE BAY DURING THE NEXT HOUR OR SO. ADDITIONAL THUNDERSTORMS WERE INDICATED OVER PORTIONS OF THE SHENANDOAH VALLEY. THESE THUNDERSTORMS WERE MOVING EASTWARD AND WILL MOVE INTO THE WESTERN SUBURBS OF WASHINGTON DC DURING THE NEXT HOUR OR SO. THUNDERSTORMS THIS EVENING WILL BE CAPABLE OF PRODUCING STRONG WINDS...HEAVY RAIN AND LIGHTNING. HEAVY RAIN MAY PRODUCE FLOODING OF LOW LYING AND POOR DRAINAGE AREAS. NEVER TRY TO CROSS A FLOODED ROAD. THE WATER DEPTH MAY BE TOO GREAT TO CROSS SAFELY. IF THREATENING WEATHER APPROACHES YOUR AREA...SEEK SHELTER. WALSTON
The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 4:19 PM EDT | Severe Thunderstorm Warning | LWX | Fauquier, Prince William, City of Manassas | 41 min |
| Aug 10, 3:28 PM EDT | Severe Thunderstorm Warning | LWX | Prince George's | 47 min |
| Aug 10, 5:14 PM EDT | Severe Thunderstorm Warning | LWX | Allegany | 46 min |
| Aug 10, 6:10 PM EDT | Severe Thunderstorm Warning | LWX | Charles | 50 min |
| Aug 10, 6:23 PM EDT | Severe Thunderstorm Warning | LWX | Calvert, Charles, Prince George's | 37 min |
Nearby
Severe Thunderstorm Warnings in Virginia, 2001Every severe thunderstorm warning in 2001
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.