Alert archive / Maryland / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 94, NWS Baltimore/Washington

May 24, 2000Frederick County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at May 24, 2000, 2:25 PM EDT for Frederick County, Maryland. 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: May 24, 2000, 2:25 PM EDT (18:25 UTC)
Expired: May 24, 2000, 3:15 PM EDT
In force: 50 min
Issued by: NWS Baltimore/Washington
Area: Whole counties

County Frederick County, MD

The radar

The Sterling radar (KLWX), 56 km from the middle of the area, began a volume at 18:26 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
May 24, 2:30 PM EDT	Thunderstorm Wind	Myersville, 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 6.4 hours before the alert went out and 58 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: 37 J/kg
Mixed-layer CIN: -277 J/kg
Mixed-layer LCL: 1255 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 9 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 May 24, 2:10 PM EDT, 15 minutes earlier.

Area forecast discussion, May 24, 2:10 PM EDT, 15 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
210 PM EDT WED MAY 24 2000

A FEW TSTM HAVE DEVELOPED OVER NC CWA NEAR PA BORDER SINCE 1PM FROM
SFC WIND CONV AND OUTFLOW FROM STORMS IN PA. ALREADY SEEING LEFT AND
RIGHT MOVERS AND HAVE HAD A REPORT OF PEA HAIL WITH WASH. CO STORM.
SFC ANAL SHOWS LEE TROF BEGINNING TO SET UP E OF MTNS. TDS IN LOW
TO MID 60S E OF MTNS WITH AMPLE SUNSHINE. TDS IN MTNS HAVE DROPPED
A FEW DEGREES PAST FEW HRS DUE TO TEMPORARY DOWNSLOPE W WINDS BEHIND
TROF. THEY SHUD REBOUND AS WINDS SHIFT BACK TO SW BEFORE FROPA.

MODEL LIS THIS EVE ARE NEG ACROSS PA WITH NEAR 0 VALUES S OF
MASON/DIXON LINE. DYNAMICS ARE ALSO GREATER TO OUR NORTH AS THE
FRONT APPROACHES. ATTM CAPS ARE HOLDING MODERATE INSTABILITY AT BAY
IN ALL BUT FAR N CWA. CAP SHUD HOLD FOR MUCH OF THE AFT OVER S
CWA...BUT THERE IS A POSSIBILITY THAT ANY OUTFLOW FROM THE STORMS
OVER NC CWA COULD TRIGGER STORMS FURTHER SOUTH.  WILL NEED TO
MONITOR CLOSELY. THE BEST MOISTURE /MARGINAL/ WILL BE RIGHT AHEAD
AND ALONG FRONT.  EXPECT MOST SHRA/TSRA ASSOC WITH THIS FEATURE.
FROPA LOOKS TO BE 04Z W TO 09Z. 850MB WINDS ARE 35KTS BEHIND FRONT
SO EXPECT BREEZY CONDITIONS THU EARLY MORNING THRU SUNSET. WILL ALSO
HAVE STRONG DOWNSLOPE ALLOWING TEMPS TO GET WELL INTO THE 80S EVEN
WITH CAA. 250MB JET WILL BE OVER CWA THU SO WELL HAVE SOME HI CLDS.
ALSO VORT ASSOC WITH CONVECTION TONIGHT OVER TN VALLEY MAY BRING A
FEW DEBRIS CLDS TO S CWA LATE THU. WILL WORD PARTLY SUNNY.

HI PRES BUILDS INTO AREA QUICKLY THU NIGHT AND FRI. WAA KICKS IN
OVER CWA FRIDAY NIGHT AHEAD OF LOW PRES PROGGED TO DEVELOP OVER THE
SOUTHERN PLAINS. BY MIDDAY SAT...LOW WILL BE IN THE OHIO VALLEY AND
THE MRF SWINGS WARM FRONT THROUGH CWA. MOISTURE ALSO INCREASES BY
SAT AFT. WILL KEEP MENTION OF SAT NIGHT AND SUN PRECIP. FROPA ON MRF
LOOKS TO BE 00Z MON. LOW IS SLOW TO EXIT REGION MON SO THERE SHUD BE
SOME CLDS AROUND FOR MEMORIAL DAY. WILL KEEP MENTION OF CLDS IN
FCST.

MARINE FCST...WILL KEEP TOM AFT JUST BELOW SMALL CRAFT AT 15 TO 20
AND GUSTY.

.LWX...
DC...FIRE WEATHER WATCH THURSDAY FOR ZONE DCZ001.

MD...FIRE WEATHER WATCH THURSDAY FOR ZONES MDZ002>007...
MDZ009>011...MDZ013>014...MDZ016>018.

VA...FIRE WEATHER WATCH THURSDAY FOR ZONES VAZ021...
VAZ025>031...VAZ036>042...VAZ050>057.

WV...FIRE WEATHER WATCH THURSDAY FOR ZONES WVZ048>055.

MMARGRAF

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 8:14 PM EDT	Severe Thunderstorm Warning	LWX	Highland	31 min
May 24, 2:58 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Howard	32 min
May 24, 3:26 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Baltimore, Howard	49 min
May 24, 3:26 PM EDT	Severe Thunderstorm Warning	LWX	City of Baltimore	49 min
May 24, 3:39 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll	46 min
May 24, 4:10 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel	30 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; radar from the NEXRAD Level II archive.