Alert archive / Maryland / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 35, NWS Baltimore/Washington

May 10, 2000Frederick County, Montgomery County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at May 10, 2000, 4:11 PM EDT for Frederick County, Montgomery County, Maryland. It was in force for 49 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: May 10, 2000, 4:11 PM EDT (20:11 UTC)
Expired: May 10, 2000, 5:00 PM EDT
In force: 49 min
Issued by: NWS Baltimore/Washington
Area: Whole counties

Counties Frederick County, MD, Montgomery County, MD

What was reported inside it

Time	Report	Where	Remark
May 10, 4:30 PM EDT	Hail 0.75	Damascus, MD	Dime sized hail fell.
May 10, 4:50 PM EDT	Hail 0.75	Darnestown, MD	Dime sized hail fell.
May 10, 5:00 PM EDT	Thunderstorm Wind	Countywide, MD	Trees and 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 10, 11:15 AM EDT	Severe Thunderstorm Watch	SPC	6 hr
May 10, 3:45 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.2 hours before the alert went out and 40 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: 825 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1518 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KLWX 102012
SVRWBC
MDC021-031-102100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
411 PM EDT WED MAY 10 2000

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN AND WESTERN MONTGOMERY COUNTY IN CENTRAL MARYLAND
  SOUTHERN FREDERICK COUNTY IN NORTH CENTRAL MARYLAND

* UNTIL 500 PM EDT

* AT 411 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH LARGE HAIL 6 MILES SOUTH OF POINT OF
  ROCKS...OR ABOUT 6 MILES NORTH OF LEESBURG...MOVING EAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   BOYDS AT 418 PM EDT
   GERMANTOWN AT 420 PM EDT
   CLARKSBURG AT 422 PM EDT
   DAMASCUS...GREEN VALLEY AT 426 PM EDT
   LAYTONSVILLE...FRIENDSHIP AT 428 PM EDT

SEEK SAFETY INDOORS AWAY FROM WINDOWS. IF CAUGHT OUTSIDE...DO NOT
STAND UNDERNEATH TREES OR OTHER ISOLATED OBJECTS. DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

AS THE STORM APPROACHES MOVE TO A PLACE OF SAFETY. TUNE INTO NOAA
WEATHER RADIO OR YOUR LOCAL RADIO OR TV STATION FOR THE LATEST
WEATHER INFORMATION.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 PM EDT
WEDNESDAY AFTERNOON FOR AND NORTHWESTERN MARYLAND AND NORTHERN
VIRGINIA.

.END/ MKM/DMW

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 May 10, 2:50 PM EDT, 1 hour 21 minutes earlier.

Area forecast discussion, May 10, 2:50 PM EDT, 1 hour 21 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
250 PM EDT WED MAY 10 2000

CD FNT PROGRESSING INTO THE APLCHNS W/ MULTIPLE CELLS FIRING AHEAD
OF IT..SOME OF THE MOST IMPRESSIVE X-SXNS I'VE SEEN IN A LONG TIME.
WE ARE MONITORING AND ISSUING WRNGS AS NEEDED.

I PLAN TO LV A 30 POP IN FOR THE ERLY EVNG FOR DC-BALT AREA...THEN
CLRG ACROSS THE CWA OVRNGT. TMRW LOOKS LIKE A NICE RESPITE FM THE
PAST SVRL DAYS OF VERY JULY-LIKE WX. NOTHING MUCH TO SPEAK OF THURS
EVENG OR FRIDAY. SLOW WARMUP ON FRI AND SAT...THEN ANOTHER CHC OF
RW/TRW LATE SAT AND SUN.

WOODY!

.LWX...SEVERE THUNDERSTORM WATCH UNTIL 500 PM EDT FOR ZONE DCZ001...
       MDZ004>018.../VAZ041>042...VAZ052>054.
       SMALL CRAFT ADVISORY THIS EVNG NRN CHES BAY AND POT

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 11:05 AM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Prince George's	55 min
May 10, 1:56 PM EDT	Severe Thunderstorm Warning	LWX	Washington	49 min
May 10, 2:40 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	50 min
May 10, 3:20 PM EDT	Severe Thunderstorm Warning	LWX	Carroll	40 min
May 10, 3:54 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll	51 min
May 10, 4:31 PM EDT	Severe Thunderstorm Warning	LWX	Howard	44 min
May 10, 4:43 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Howard, Montgomery	47 min
May 10, 4:43 PM EDT	Severe Thunderstorm Warning	LWX	City of Baltimore	47 min
May 10, 5:06 PM EDT	Tornado Warning	LWX	Baltimore	24 min
May 10, 5:59 PM EDT	Severe Thunderstorm Warning	LWX	Prince George's	46 min
May 10, 6:11 PM EDT	Severe Thunderstorm Warning	LWX	Charles	49 min
May 10, 6:33 PM EDT	Severe Thunderstorm Warning	LWX	Calvert	42 min
May 10, 6:51 PM EDT	Severe Thunderstorm Warning	LWX	Charles, Saint Mary's	39 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2000 Every severe thunderstorm warning in 2000

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.