Alert archive / West Virginia / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 8, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at Apr 9, 2001, 7:21 PM EDT for Washington County, Maryland; Berkeley County, Morgan County, West Virginia. It was in force for 54 min. 3 reports 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
- 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
Counties Washington County, MD, Berkeley County, WV, Morgan County, WV
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 9, 7:25 PM EDT | Thunderstorm Wind | Berkeley Spgs, WV | A few trees were downed. |
| Apr 9, 7:30 PM EDT | Thunderstorm Wind | Martinsburg, WV | Two trees were downed. |
| Apr 9, 7:40 PM EDT | Thunderstorm Wind | Countywide, MD | Scattered 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 9, 7:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 11.4 hours before the alert went out and 86 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
- 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
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 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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 7:21 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 54 min |
| Apr 9, 7:55 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Carroll | 65 min |
| Apr 9, 7:55 PM EDT | Severe Thunderstorm Warning | LWX | Harford | 65 min |
| Apr 9, 7:21 PM EDT | Severe Thunderstorm Warning | LWX | Jefferson | 54 min |
Nearby
Severe Thunderstorm Warnings in West Virginia, 2001Severe Thunderstorm Warnings in Maryland, 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.