Alert archive / Virginia / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 134, NWS Baltimore/Washington

August 30, 2001Rockingham County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 30, 2001, 4:40 PM EDT for Rockingham County, Virginia. It was in force for 50 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 30, 2001, 4:40 PM EDT (20:40 UTC)
Expired: Aug 30, 2001, 5:30 PM EDT
In force: 50 min
Issued by: NWS Baltimore/Washington
Area: Whole counties

County Rockingham County, VA

What was reported inside it

Time	Report	Where	Remark
Aug 30, 5:00 PM EDT	Thunderstorm Wind	Elkton, VA	Power lines 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 12:00Z, 8.7 hours before the alert went out and 137 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: 1915 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 517 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 30, 10:15 AM EDT, 6 hours 25 minutes earlier.

Area forecast discussion, Aug 30, 10:15 AM EDT, 6 hours 25 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
1015 AM EDT THU AUG 30 2001

WEAK HI PRES ACRS THE AREA ATTM ALONG WITH A WEAK FRNTL BNDRY XTNDG
FM NEAR FDK TO BTWN IAD AND DCA THEN E OF EZF. SCT SHWRS AND A FEW
TSTMS HAVE BEEN ACTIVE AHEAD OF THE BNDRY. SAT IMAGERY DEPICTS GNRL
CLDINS E OF THE BLUE RDG WITH PATCHES OF DENSE FOG RMNG TO THE WEST
OF THE RDG WHICH WL DISSIPATE BY ARND NOON. OTW ERLR FCST PKG
APPEARS ON TARGET FOR THE RMNDR OF THE DAY. SLT OR 30 POP CHC WL DO
FOR ANY CONV ACTVTY WHICH WL BE DIURNALLY DRIVEN WITH LTL OR NO UPR
SUPPORT. FOG AND CONV BEING HANDLED WITH NOWS.

THATS IT FOR NOW...LATER.

FCSTID = 13...PAP
DCA   86  72  86  69 /  20  10  30  50
BWI   86  69  86  67 /  20  10  30  50
MRB   85  67  85  65 /  20  10  30  60
IAD   86  67  86  65 /  20  10  30  50
CHO   85  68  85  67 /  30  20  40  50
HGR   85  66  85  64 /  20  10  30  60
NHK   86  69  86  67 /  20  10  30  50
W99   86  68  86  66 /  20  10  30  60

.LWX...
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
Aug 30, 3:55 PM EDT	Severe Thunderstorm Warning	LWX	Orange	65 min
Aug 30, 4:20 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, City of Charlottesville	55 min
Aug 30, 5:02 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fauquier	53 min
Aug 30, 1:31 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel	29 min
Aug 30, 1:38 PM EDT	Flash Flood Warning	LWX	Anne Arundel	2 hr
Aug 30, 5:57 PM EDT	Flash Flood Warning	LWX	Anne Arundel	2 hr
Aug 30, 7:03 PM EDT	Flash Flood Warning	LWX	Howard	117 min
Aug 30, 7:46 PM EDT	Flash Flood Warning	LWX	Charles	119 min

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.