Alert archive / West Virginia / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 9, NWS Baltimore/Washington

April 9, 2001Jefferson County, West Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Apr 9, 2001, 7:21 PM EDT for Jefferson County, West Virginia. It was in force for 54 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 9, 2001, 7:21 PM EDT (23:21 UTC)
Expired
Apr 9, 2001, 8:15 PM EDT
In force
54 min
Issued by
NWS Baltimore/Washington
Area
Whole counties

County Jefferson County, WV

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 9, 7:00 PM EDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.4 hours before the alert went out and 56 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2001-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2001-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1273 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KLWX 092351 RRA
SVRWBC

MDC021-043-WVC003-037-065-100015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
721 PM EDT MON APR 9 2001

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FREDERICK COUNTY IN NORTH CENTRAL MARYLAND
  WASHINGTON COUNTY IN NORTH CENTRAL MARYLAND
  BERKELEY COUNTY IN THE PANHANDLE OF WEST VIRGINIA
  JEFFERSON COUNTY IN THE PANHANDLE OF WEST VIRGINIA
  MORGAN COUNTY IN THE PANHANDLE OF WEST VIRGINIA

* UNTIL 815 PM EDT

* AT 719 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 12 MILES NORTH OF BERKELEY SPRINGS...MOVING EAST
  AT 50 MPH.

THIS STORM HAS A HISTORY OF DOWNING TREES AND HAIL. MOVE INDOORS NOW.

REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...
DAMAGING WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY
HEAVY ReAIN. IF SEVERE WEATHER APPROACHES...GO INSIDE A STURDY SHELTER
AND STAY AWAY FROM DOORS AND WINDOWS.

TUNE INTO NOAA WEATHER RADIO OR YOUR LOCAL RADIO OR TV STATION FOR
THE LATEST WEATHER INFORMATION.

$$
STRONG

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 Apr 9, 3:15 PM EDT, 4 hours 6 minutes earlier.

Area forecast discussion, Apr 9, 3:15 PM EDT, 4 hours 6 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
315 PM EDT MON APR 9 2001

AT 19Z...TSTMS COVER N 1/2 OF PA ASSOC WITH SFC BDRY...AND A FEW
TSRA IN NW WV ASSOC WITH HI INSTABILITY. TEMPS SOARING INTO 80S TO
LOWER 90S DUE TO DOWNSLOPE WINDS 10-20 MPH. CWA STILL IN UNSTABLE
AIR WITH LI'S -3 TO -6C AND CAPE 2000 J/KG. STILL EXPECTING SCT
TSTMS TO DEVELOP OVER CWA THIS AFT AND SOME ACTIVITY N AND W
OF CWA TO MOVE INTO NW CWA BEFORE SUNSET AND ACROSS N CWA TONIGHT.
WILL HAVE LIKELY POPS AND MENTION GUSTY WINDS/HAIL IN NW CWA AND
KEEP CHANCE POPS FOR SHRA/TSRA ELSEWHERE TONIGHT. MCS TYPE COMPLEX
FCST TO DEVELOP TO OUR NW OVERNIGHT WHICH COULD ALSO SEND SOME
DEBRIS CONVECTION OUR WAY AFTER 06Z.

BDRY TO OUR N ACTS AS A BACK DOOR COLD FRONT OVERNIGHT PUSHING SWARD
AND PUTS E 1/3 OF CWA INTO STABLE MARINE AIR TUE THRU WED NIGHT.
HAVE DROPPED MENTION OF TSRA AND KEPT SHRA IN THIS AREA THRU PERIOD.
HAVE ALSO DROPPED HI TEMPS THERE TO ACCOUNT FOR CLDY CONDITIONS.
LEFT SHRA/TSRA ELSEWHERE TUE THRU WED NIGHT. ACROSS ENTIRE CWA WILL
HAVE CHANCE POPS EXCEPT FOR TUE EVE/NIGHT LIKELY POPS WHEN STRONGEST
FORCING /STRONG VVEL 500-700MB...STRONG WAA AND WEAK VORT MAX/ PASS
THRU. W CWA SEES STRONG FORCING TUE AFT SO THEY COULD SEE ANOTHER
ROUND OF STRONG WX THEN.

ON THU...FRONT PUSHES NE AND ENTIRE CWA WILL BE IN JUICY AIR AGAIN.
A RAPIDLY WEAKENING FRONT WILL PUSH THRU CWA THU AFT. ANOTHER FRONT
ASSOC WITH STRONG LOW OVER GREAT LAKES PUSHES THRU FRI NIGHT.  LOW
PRES DEVELOPS OVER OH VALLEY SATURDAY AND SENDS ANOTHER COLD FRONT
THRU AREA SAT. THIS ACTIVITY WARRENTS CHANCE SHRA/TSRA CWA WIDE THU
THRU SAT.  HI PRES SUN AND MON SO FINALLY NO MENTION OF PRECIP IN
FCST.

FCSTID = 36
DCA   59  69  51  62 /  50  40  60  30
BWI   57  68  50  60 /  50  40  60  30
MRB   58  71  50  64 /  60  50  60  30
IAD   58  70  51  63 /  50  40  60  30
CHO   c59  75  53  67 /  40  40  60  30
HGR   55  69  49  63 /  60  50  60  30
NHK   60  67  52  60 /  50  40  60  30

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

MMARGRAF

In the hours before

Special weather statement, Apr 9, 7:00 PM EDT, 21 minutes before
MDZ002>004-WVZ048>052-092300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
700 PM EDT MON APR 9 2001

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 12 AM...

STRONG THUNDERSTORMS WILL BE MOVING INTO WESTERN MARYLAND AND THE
EASTERN PANHANDLE OF WEST VIRGINIA BETWEEN 7 AND 9:30 THIS EVENING.
SOME OF THESE STORMS MAY PRODUCE DAMAGING WINDS AND LARGE HAIL. STAY
TUNED FOR LATER STATEMENTS AND POSSIBLE WARNINGS.f

STRONG

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 7:21 PM EDTSevere Thunderstorm WarningLWXBerkeley, Morgan54 min

Nearby

Severe Thunderstorm Warnings in West 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; the sounding from the Mesonet's radiosonde archive.