Alert archive / Virginia / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 121, NWS Wakefield, VA

July 29, 2007Northumberland County, Virginia

NWS Wakefield, VA issued this severe thunderstorm warning at Jul 29, 2007, 4:39 PM EDT for Northumberland County, Virginia. It was in force for 28 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 29, 2007, 4:39 PM EDT (20:39 UTC)
Expired: Jul 29, 2007, 5:07 PM EDT
In force: 28 min
Issued by: NWS Wakefield, VA
Area: Counties, with a storm outline in the text

County Northumberland County, VA

The radar

The Norfolk radar (KAKQ), 110 km from the middle of the area, began a volume at 20:42 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.7 hours before the alert went out and 94 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: 2108 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 627 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Wakefield, VA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 29, 4:00 PM EDT, 39 minutes earlier.

Area forecast discussion, Jul 29, 4:00 PM EDT, 39 minutes before

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Hazardous weather outlook, Jul 29, 10:22 AM EDT, 6 hours 17 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE WAKEFIELD VA
1022 AM EDT SUN JUL 29 2007

ANZ630>633-650-652-654-656-658-MDZ021>025-NCZ012>017-030>032-102-
VAZ048-049-060>100-301430-
CHESAPEAKE BAY FROM SMITH POINT TO WINDMILL POINT VA-
CHESAPEAKE BAY FROM WINDMILL POINT TO NEW POINT COMFORT VA-
CHESAPEAKE BAY FROM NEW POINT COMFORT TO CAPE HENRY VA-
CURRITUCK SOUND-
COASTAL WATERS FROM FENWICK ISLAND DE TO CHINCOTEAGUE VA OUT 20 NM-
COASTAL WATERS FROM CHINCOTEAGUE TO PARRAMORE ISLAND VA OUT 20 NM-
COASTAL WATERS FROM PARRAMORE ISLAND TO CAPE CHARLES LIGHT VA OUT
20 NM-
COASTAL WATERS FROM CAPE CHARLES LIGHT VA TO NC VA BORDER OUT 20 NM-
COASTAL WATERS FROM NC VA BORDER TO CURRITUCK BEACH LIGHT NC OUT
20 NM-DORCHESTER-WICOMICO-SOMERSET-INLAND WORCESTER-MARYLAND BEACHES-
NORTHAMPTON NC-HERTFORD-GATES-PASQUOTANK-CAMDEN-INLAND CURRITUCK-
BERTIE-CHOWAN-PERQUIMANS-OUTER BANKS CURRITUCK-FLUVANNA-LOUISA-
PRINCE EDWARD-CUMBERLAND-GOOCHLAND-HANOVER-CAROLINE-MECKLENBURG-
LUNENBURG-NOTTOWAY-AMELIA-POWHATAN-CHESTERFIELD-HENRICO-KING WILLIAM-
KING AND QUEEN-ESSEX-WESTMORELAND-RICHMOND-NORTHUMBERLAND-LANCASTER-
BRUNSWICK-DINWIDDIE-PRINCE GEORGE-CHARLES CITY-NEW KENT-GLOUCESTER-
MIDDLESEX-MATHEWS-GREENSVILLE-SUSSEX-SURRY-JAMES CITY-YORK-
SOUTHAMPTON-ISLE OF WIGHT-NEWPORT NEWS/HAMPTON-NORFOLK/PORTSMOUTH-
SUFFOLK-CHESAPEAKE-VIRGINIA BEACH-ACCOMACK-NORTHAMPTON VA-
1022 AM EDT SUN JUL 29 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE CENTRAL CHESAPEAKE
BAY...THE SOUTHERN CHESAPEAKE BAY...THE MID ATLANTIC COASTAL
WATERS...CURRITUCK SOUND...THE LOWER EASTERN SHORE OF
MARYLAND...COASTAL NORTHEAST NORTH CAROLINA...INTERIOR NORTHEAST
NORTH CAROLINA...THE NORTHERN OUTER BANKS OF NORTH
CAROLINA...CENTRAL VIRGINIA...EAST CENTRAL VIRGINIA...INTERIOR
SOUTHEAST VIRGINIA...SOUTH CENTRAL VIRGINIA...SOUTH HAMPTON ROADS
VIRGINIA...THE EASTERN SHORE OF VIRGINIA...THE MIDDLE PENINSULA OF
VIRGINIA...THE NORTHERN NECK OF VIRGINIA...THE PENINSULA OF
SOUTHEAST VIRGINIA AND THE PIEDMONT OF CENTRAL VIRGINIA.

.DAY ONE...TODAY AND TONIGHT
SCATTERED AFTERNOON AND EVENING THUNDERSTORMS MAY PRODUCE HEAVY
DOWNPOURS ALONG WITH GUSTY WINDS AND SMALL HAIL.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY
SCATTERED AFTERNOON AND EVENING THUNDERSTORMS MAY PRODUCE HEAVY
DOWNPOURS ALONG WITH GUSTY WINDS AND SMALL HAIL ON MONDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

BROWN

In the hours before

Special weather statement, Jul 29, 3:17 PM EDT, 1 hour 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WAKEFIELD VA
317 PM EDT SUN JUL 29 2007

VAZ074-292000-
ESSEX VA-
317 PM EDT SUN JUL 29 2007

...STRONG THUNDERSTORM DEVELOPING OVER CENTRAL ESSEX COUNTY...

AT 317 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER TAPPAHANNOCK...MOVING NORTH AT 5 MPH. THE
STRONG THUNDERSTORMS WILL BE NEAR BRAYS FORK AT 330 PM EDT...
DUNBROOKE AT 335 PM EDT...TAPPAHANNOCK AT 345 PM EDT...MOUNT LANDING
AT 400 PM EDT.

WIND GUSTS TO 45 MPH...SMALL HAIL AND FREQUENT CLOUD TO
GROUND LIGHTNING ARE EXPECTED IN THE PATH OF THESE STORMS.

RAINFALL RATES OF ONE TO TWO INCHES PER HOUR WILL CAUSE PONDING OF
WATER ON ROADWAYS...AND POSSIBLE LOCALIZED FLOODING IN LOW LYING AND
FLOOD PRONE AREAS.

MCNATT

Special weather statement, Jul 29, 3:57 PM EDT, 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WAKEFIELD VA
357 PM EDT SUN JUL 29 2007

VAZ064-292100-
CAROLINE VA-
357 PM EDT SUN JUL 29 2007

...STRONG THUNDERSTORM DEVELOPING OVER CENTRAL CAROLINE COUNTY...

AT 357 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER BOWLING GREEN...MOVING NORTH AT 10 MPH. THE
STRONG THUNDERSTORMS WILL BE NEAR VILLBORO AT 410 PM EDT...FORT A.P.
HILL AT 415 PM EDT.

WIND GUSTS TO 45 MPH...SMALL HAIL AND FREQUENT CLOUD TO GROUND
LIGHTNING ARE EXPECTED IN THE PATH OF THESE STORMS.

RAINFALL RATES OF UP TO TWO INCHES PER HOUR WILL CAUSE PONDING OF
WATER ON ROADWAYS...AND POSSIBLE LOCALIZED FLOODING IN LOW LYING AND
FLOOD PRONE AREAS.

MCNATT

Local storm report, Jul 29, 4:07 PM EDT, 32 minutes before

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Local storm report, Jul 29, 4:09 PM EDT, 30 minutes before

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Special weather statement, Jul 29, 4:30 PM EDT, 9 minutes before

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Special weather statement, Jul 29, 4:39 PM EDT, 0 minutes before

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The office that day

Everything else NWS Wakefield, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 29, 2:56 PM EDT	Severe Thunderstorm Warning	AKQ	Hanover, Henrico	49 min
Jul 29, 3:54 PM EDT	Severe Thunderstorm Warning	AKQ	Essex, Westmoreland	51 min
Jul 29, 4:09 PM EDT	Severe Thunderstorm Warning	AKQ	Accomack	51 min
Jul 29, 4:11 PM EDT	Severe Thunderstorm Warning	AKQ	Richmond	49 min
Jul 29, 4:52 PM EDT	Areal Flood Advisory	AKQ	Caroline, Essex, King and Queen, Lancaster, Northumberland, Richmond and 1 more	3 hr
Jul 29, 5:25 PM EDT	Areal Flood Advisory	AKQ	Isle of Wight, Surry, City of Suffolk	3 hr
Jul 29, 5:25 PM EDT	Severe Thunderstorm Warning	AKQ	James City, York, City of Williamsburg	50 min
Jul 29, 5:30 PM EDT	Severe Thunderstorm Warning	AKQ	City of Newport News	45 min
Jul 29, 5:33 PM EDT	Severe Thunderstorm Warning	AKQ	Surry	42 min
Jul 29, 6:06 PM EDT	Areal Flood Advisory	AKQ	James City, York, City of Hampton, City of Newport News	3 hr
Jul 29, 6:07 PM EDT	Severe Thunderstorm Warning	AKQ	Louisa	53 min
Jul 29, 6:13 PM EDT	Severe Thunderstorm Warning	AKQ	Charles City, Prince George, City of Hopewell	47 min
Jul 29, 6:35 PM EDT	Special Marine Warning	AKQ		115 min
Jul 29, 6:36 PM EDT	Severe Thunderstorm Warning	AKQ	Lancaster, Northumberland, Richmond	42 min
Jul 29, 6:40 PM EDT	Severe Thunderstorm Warning	AKQ	King William, New Kent	50 min
Jul 29, 6:48 PM EDT	Severe Thunderstorm Warning	AKQ	City of Suffolk	42 min
Jul 29, 6:54 PM EDT	Severe Thunderstorm Warning	AKQ	Prince George, City of Petersburg	34 min
Jul 29, 7:20 PM EDT	Areal Flood Advisory	AKQ	Charles City, King and Queen, King William, New Kent, Prince George	3 hr
Jul 29, 7:24 PM EDT	Special Marine Warning	AKQ		66 min
Jul 29, 7:43 PM EDT	Severe Thunderstorm Warning	AKQ	King William	24 min
Jul 29, 5:31 PM EDT	Areal Flood Advisory	AKQ	Bertie, Hertford, Northampton	3 hr
Jul 29, 2:24 PM EDT	Severe Thunderstorm Warning	AKQ	Wicomico	51 min
Jul 29, 3:05 PM EDT	Severe Thunderstorm Warning	AKQ	Somerset, Wicomico, Worcester	40 min
Jul 29, 3:33 PM EDT	Flash Flood Warning	AKQ	Somerset, Wicomico	3 hr
Jul 29, 4:01 PM EDT	Severe Thunderstorm Warning	AKQ	Somerset, Worcester	59 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2007 Every 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.