Alert archive / Virginia / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 252, NWS Baltimore/Washington

August 16, 2007Greene County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 16, 2007, 4:58 PM EDT for Greene County, Virginia. It was in force for 77 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 16, 2007, 4:58 PM EDT (20:58 UTC)
Expired
Aug 16, 2007, 6:15 PM EDT
In force
77 min
Issued by
NWS Baltimore/Washington
Area
Counties, with a storm outline in the text

County Greene County, VA

The radar

The Sterling radar (KLWX), 105 km from the middle of the area, began a volume at 21:00 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 watch it was issued in

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

IssuedProductOfficeLasted
Aug 16, 4:44 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.0 hours before the alert went out and 110 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 2007-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 102 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 2007-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 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
102 J/kg
Mixed-layer CIN
-341 J/kg
Mixed-layer LCL
1579 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
67 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 162058
SVRLWX
VAC079-162215-
/O.NEW.KLWX.SV.W.0252.070816T2058Z-070816T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
458 PM EDT THU AUG 16 2007

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GREENE COUNTY IN CENTRAL VIRGINIA

* UNTIL 615 PM EDT

* AT 456 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED 7 MILES NORTHWEST OF
  FLETCHER...AND MOVING SOUTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  FLETCHER...
  MCMULLEN...

HAIL TO THE SIZE OF PENNIES AND WIND GUSTS TO 60 MPH CAN BE EXPECTED
IN THE WARNED AREA. STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE
STORM HAS PASSED.

LAT...LON 3847 7847 3834 7855 3832 7839 3847 7845

$$

ROGOWSKI
2 follow-up statements
000 
WWUS51 KLWX 162106
SVSLWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
506 PM EDT THU AUG 16 2007

VAC079-162215-
/O.CON.KLWX.SV.W.0252.000000T0000Z-070816T2215Z/
GREENE VA-
506 PM EDT THU AUG 16 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR GREENE COUNTY...

AT 505 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE 
HAIL...AND WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 3 
MILES WEST OF FLETCHER...MOVING SOUTHEAST AT 20 MPH.

LAT...LON 3844 7849 3834 7855 3832 7839 3847 7845

$$

ROGOWSKI
000 
WWUS51 KLWX 162147
SVSLWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
547 PM EDT THU AUG 16 2007

VAC079-162215-
/O.CON.KLWX.SV.W.0252.000000T0000Z-070816T2215Z/
GREENE VA-
547 PM EDT THU AUG 16 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR GREENE COUNTY...

AT 543 PM EDT...A LINE OF SEVERE THUNDERSTORMS WAS REPORTED CAPABLE
OF PRODUCING PENNY SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60
MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 3 MILES 
WEST OF SAINT GEORGE TO RUCKERSVILLE IN SOUTHERN GREENE COUNTY.

LAT...LON 3836 7854 3827 7864 3819 7837 3825 7833

$$

ROGOWSKI

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 9:04 AM EDTSpecial Marine WarningLWX116 min
Aug 16, 9:39 AM EDTSpecial Marine WarningLWX36 min
Aug 16, 4:35 PM EDTSevere Thunderstorm WarningLWXPage, Rockingham70 min
Aug 16, 5:12 PM EDTSevere Thunderstorm WarningLWXMadison32 min
Aug 16, 5:39 PM EDTSevere Thunderstorm WarningLWXAlbemarle66 min
Aug 16, 5:41 PM EDTSevere Thunderstorm WarningLWXOrange64 min
Aug 16, 6:09 PM EDTSevere Thunderstorm WarningLWXGreene51 min
Aug 16, 6:45 PM EDTSevere Thunderstorm WarningLWXAlbemarle75 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2007Every severe thunderstorm warning in 2007

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.