Alert archive / Maryland / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 101, NWS Baltimore/Washington

July 5, 2001Prince George's County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 5, 2001, 5:20 PM EDT for Prince George's County, Maryland. It was in force for 40 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
Jul 5, 2001, 5:20 PM EDT (21:20 UTC)
Expired
Jul 5, 2001, 6:00 PM EDT
In force
40 min
Issued by
NWS Baltimore/Washington
Area
Whole counties

County Prince George's County, MD

The radar

The Sterling radar (KLWX), 58 km from the middle of the area, began a volume at 21:20 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.3 hours before the alert went out and 50 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 2001-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 9 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 2001-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.19395878Sfc1 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
9 J/kg
Mixed-layer CIN
-165 J/kg
Mixed-layer LCL
1085 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KLWX 052119
SVRLWX

DCC001-MDC033-052200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BALTIMORE-WASHINGTON
520 PM EDT THU JUL 5 2001

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DISTRICT OF COLUMBIA IN DISTRICT OF COLUMBIA
  PRINCE GEORGES COUNTY IN CENTRAL MARYLAND

* UNTIL 600 PM EDT

* AT 515 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER CORAL HILLS...MOVING EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  5 MILES NORTH OF ANDREWS AFB AT 524 PM
  OVER LARGO...4 MILES SOUTH OF MITCHELLVILLE AT 526 PM
  OVER KETTERING AT 530 PM
  7 MILES SOUTH OF BOWIE AT 534 PM
  3 MILES NORTH OF UPPER MARLBORO AT 536 PM

REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...
DAMAGING WINDS IN EXCESS OF 55 MPH...DEADLY LIGHTNING...AND VERY
HEAVY RAIN. 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.

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 Jul 5, 2:35 PM EDT, 2 hours 45 minutes earlier.

Area forecast discussion, Jul 5, 2:35 PM EDT, 2 hours 45 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE/WASHINGTON
235 PM EDT THU JUL 5 2001

PATTERN ACRS THE COUNTRY WILL BE DOMINATED BY AN UPR LVL TROF OVR
THE ERN U.S. AND UPR LVL RDG OVR THE ROCKIES AND PLAIN STATES. BY
SAT...THE UPR LVL TROF WILL BEGIN TO LIFT OUT AS THE CUTOFF LOW OVR
QUEBEC BEGINS TO MOVE NE. THIS WILL RESULT IN RISING HGTS OVR THE
AREA BY SAT. HOWEVER...BY SUN...ANOTHER PIECE OF ENERGY DROPS INTO
THE LONGWAVE TROF POSITION ALG THE E COAST...REINFORCING THE TROF.

SFC CDFNT WILL MOVE THRU THE AREA THIS EVE. DON'T EXPECT WIDESPREAD
CONVECTION ALG OR AHD OF THE CDFNT. SOUNDINGS SHOW A WEAK CAP OVR
THE AREA. WINDS WILL NOT BE BACKING MUCH AHD OF THE CDFNT SO
CONVERGENCE IS WEAK.  IN ADDITION...ALL THE DEEP MOISTURE HAS BEEN
SWEPT E OF THE AREA WITH THE SFC TROF LEAVING ONLY SOME RESIDUAL
SHALLOW MOISTURE OVR THE AREA. ALSO...WESTERLY FLOW AHD OF THE CDFNT
WILL RESULT IN DOWNSLOPING WHICH WILL TEND TO SUPPRESS CONVECTION.
HOWEVER...MODIFIED SOUNDING SHOWS A CAPE OF 1300 THIS EVE WITH LIS
AROUND MINUS 4. IN ADDITION...THE 12Z ETA AND NGM BOTH SHOW SOME QPF
OVR THE AREA. WILL LEAVE 30 POPS IN THE FCST UNTIL MIDNIGHT THEN P/C.

SFC HIGH PRES BUILDS INTO THE AREA FRI AND FRI NIGHT WITH A COOL AND
DRY AIR MASS. GOING WITH SUNNY SKIES FRI AND CLR FRI NIGHT.

SFC HIGH MOVES OFF THE CST SAT AND RETURN S FLOW DEVELOPS BRINGING
SOME MOISTURE BACK INTO THE AREA. IN ADDITION...AS HGTS START TO
RISE OVR THE AREA...WHATS LEFT OF THE FNT TO OUR S WILL MOVE BACK N
AS A WEAK WMFNT. ETA DEVELOPS SOME UVVS OVR THE AREA LATE SAT IN
ASSOCIATION WITH THE RETURN FLOW/WMFNT. THE AVN KEEPS THE UVVS NW OF
THE AREA. THINK THE ETA MAY BE OVERDOING THE UVVS AND MOISTURE SO
RIGHT NOW WILL ONLY HAVE HIDDEN 20 POPS IN FOR SAT AND HOLD OFF ON
MENTIONING ANY SHRAS/TSRAS UNTIL SAT NIGHT.

NGM AND AVN MOS NUMBERS ARE CLOSE THE 1ST 3 PDS. HOWEVER...THE MOS
HAS BEEN RUNNING TOO WARM LATELY WHEN WE GET A COOL DRY AIR MASS
INTO THE AREA. WILL UNDERCUT MOS TEMPS A COUPLE DEGREES ON FRI.  NGM
MOS IS WARMER THAN THE AVN MOS FOR SAT. WENT WITH A COMPROMISE
BETWEEN THE TWO SETS OF NUMBERS SAT.

FOR THE EXTENDED...
THE AVN HAS A CDFNT MOVING THRU THE AREA ON SUN AS THE NEXT
SHORTWAVE DROPS INTO THE TROF POSITION. WILL HAVE CHC POPS SUN FOR
SHRA/TSRA. HIGH PRES BUILDS INTO THE AREA MON/TUE WITH DRIER AIR
MASS.

FCSTID = 15 / DMW

DCA   63  81  63  87 /  30   0   0  20
BWI   58  80  56  87 /  30   0   0  20
MRB   54  80  52  87 /  30   0   0  20
IAD   54  80  52  87 /  30   0   0  20
CHO   58  81  59  87 /  30   0   0  20
HGR   52  79  51  86 /  30   0   0  20
NHK   6U4  81  63  87 /  30   0   0  20
W99   48  78  47  85 /  30   0   0  20

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

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 3:48 PM EDTSevere Thunderstorm WarningLWXMontgomery27 min
Jul 5, 5:32 PM EDTSevere Thunderstorm WarningLWXAnne Arundel28 min
Jul 5, 6:21 PM EDTSevere Thunderstorm WarningLWXCarroll, Frederick, Howard39 min
Jul 5, 6:45 PM EDTSevere Thunderstorm WarningLWXBaltimore, City of Baltimore60 min
Jul 5, 6:57 PM EDTTornado WarningLWXBaltimore, City of Baltimore33 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2001Severe Thunderstorm Warnings in District of Columbia, 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; radar from the NEXRAD Level II archive.