Alert archive / Virginia / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 75, NWS Baltimore/Washington

June 21, 2001Shenandoah County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 21, 2001, 8:10 PM EDT for Shenandoah County, Virginia. It was in force for 65 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: Jun 21, 2001, 8:10 PM EDT (00:10 UTC)
Expired: Jun 21, 2001, 9:15 PM EDT
In force: 65 min
Issued by: NWS Baltimore/Washington
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Shenandoah County, VA

The radar

The Sterling radar (KLWX), 95 km from the middle of the area, began a volume at 00:13 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
Jun 21, 8:25 PM EDT	Thunderstorm Wind	South Portion, VA	Numerous trees were downed.

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 00:00Z, 0.2 hours before the alert went out and 102 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: 1501 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1196 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

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 Jun 21, 3:35 PM EDT, 4 hours 35 minutes earlier.

Area forecast discussion, Jun 21, 3:35 PM EDT, 4 hours 35 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
335 PM EDT THU JUN 21 2001

FEW TSRA DVLPG...MAINLY ALNG PERIPHERY OF CWFA. W/ BEST FOCUSING
MECH/FORCING N AND W...WUD XPCT THESE AREAS TO BE MOST UNDER THE GUN
LTR TDA. GOOD OMEGA MVG INTO WRN SXNS THIS EVNG...SO LIKELY POPS
THERE...CHC ELSW.

H5 L/WV TROF DRIVES CDFNT INTO AREA TMRW. HWVR...FLW BCMS
PARALLEL...SO FWD MVMT STALLS. AMS AHD OF FNT EQUALLY UNSTBL AS
TDA...IF NOT SLGTLY MORE SO...PLUS FRNT PROVIDES A FOCUS/TRIGGER. W/
CD/QSTNRY FNT IN VCNTY...WL GO LIKELY POPS 2ND-4TH PDS. NO PD WL BE
TTL WASHOUT...BUT WL EMPH AFTN AND EVE CNVTN.

XTNDD THROWS A CURVE FM PREV PKG AS MRF DVLPS H5 CUTOFF LO OVR
APPALACHIA...AND LETS IT LINGER THRU DAY 5. W/ H3 JET STRK ON E SIDE
OF SYSTM...THINK THIS IS A LTL OVRDN. UKMET SHWS LTL MORE THAN WK
TROF/SFC REFLCTN IN AREA. WENT W/ A MRF WEIGHTED COMPROMISE...CLS TO
CNDN SOLN. ADDED MIX CLDS/SUN AND SCT AFTN SHRA TO SUN-TUE FCST. W/
FRNT STL IN VCNTY...INCL TSRA TO SUNDAY FCST AS WELL.  FOR DAY 6 & 7
WENT PTCLDY...AND LATER SHIFTS CAN LEAN IN APPRO DIRECTION.

ZFP/RDF BY 1945 UTC. LATER

FCSTID = 50...HTS
DCA   70  86  70  82 /  40  60  60  60
BWI   69  85  67  80 /  40  60  60  60
MRB   66  84  65  78 /  60  60  60  60
IAD   68  84  67  79 /  40  60  60  60
CHO   66  86  66  81 /  60  60  60  60
HGR   64  83  64  77 /  60  60  60  60
NHK   70  85  70  81 /  30  60  60  60

.LWX...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.

In the hours before

Local storm report, Jun 21, 3:09 PM EDT, 5 hours 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
309 PM EDT THU JUN 21 2001

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0830 PM    BALTIMORE                 MD   WIND DAMAGE
06/20/01   BALTIMORE                      NUMEROUS TREES DOWN
                                          REPORTED BY PUBLIC WORKS

1030 PM    CHARLOTTESVILLE           VA   WIND DAMAGVE
06/20/01   ALBEMARLE                      NUMEROUS TREES AND
                                          POWERLINES DOWN

JLW/MM

Local storm report, Jun 21, 6:24 PM EDT, 1 hour 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
624 PM EDT THU JUN 21 2001

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0617 PM    LAUREL                    MD   1.00 INCH HAIL
06/21/01   PRINCE GEORGES

JLW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 12:15 AM EDT	Flash Flood Warning	LWX	Orange	2 hr
Jun 22, 1:23 PM EDT	Flash Flood Warning	LWX	Frederick	3 hr
Jun 22, 1:39 PM EDT	Severe Thunderstorm Warning	LWX	Warren	51 min
Jun 22, 2:00 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, City of Winchester	45 min
Jun 22, 4:08 PM EDT	Tornado Warning	LWX	Clarke, Warren	37 min
Jun 22, 4:13 PM EDT	Flash Flood Warning	LWX	Frederick, City of Winchester	3 hr
Jun 22, 4:20 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fauquier, Rappahannock	55 min
Jun 22, 4:23 PM EDT	Flash Flood Warning	LWX	Shenandoah, Warren	3 hr
Jun 22, 4:40 PM EDT	Flash Flood Warning	LWX	Nelson	3 hr
Jun 22, 5:34 PM EDT	Flash Flood Warning	LWX	Loudoun	116 min
Jun 22, 6:03 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	57 min
Jun 22, 6:09 PM EDT	Flash Flood Warning	LWX	Rockingham	3 hr
Jun 22, 7:22 PM EDT	Flash Flood Warning	LWX	Shenandoah	3 hr
Jun 22, 7:24 PM EDT	Flash Flood Warning	LWX	Loudoun	3 hr
Jun 22, 7:31 PM EDT	Severe Thunderstorm Warning	LWX	Prince William, City of Manassas, City of Manassas Park	59 min
Jun 22, 7:31 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier	59 min
Jun 22, 3:56 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	49 min
Jun 22, 4:30 PM EDT	Flash Flood Warning	LWX	Allegany	3 hr
Jun 22, 4:34 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	41 min
Jun 22, 4:43 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	47 min
Jun 22, 6:58 PM EDT	Flash Flood Warning	LWX	Carroll	3 hr
Jun 22, 5:24 PM EDT	Flash Flood Warning	LWX	Hardy	3 hr

Nearby

Severe Thunderstorm Warnings in Virginia, 2001 Every 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; radar from the NEXRAD Level II archive.