Alert archive / North Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 177, NWS Wakefield, VA

July 20, 2011Bertie County, North Carolina

NWS Wakefield, VA issued this severe thunderstorm warning at Jul 20, 2011, 4:55 PM EDT for Bertie County, North Carolina. It was in force for 39 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 20, 2011, 4:55 PM EDT (20:55 UTC)
Expired: Jul 20, 2011, 5:34 PM EDT
In force: 39 min
Issued by: NWS Wakefield, VA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Bertie County, NC

The radar

The Norfolk radar (KAKQ), 102 km from the middle of the area, began a volume at 20:58 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

Newport, NC (KMHX), launched 12:00Z, 8.9 hours before the alert went out and 143 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: 911 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 967 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 88 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 20, 4:18 PM EDT, 37 minutes earlier.

Area forecast discussion, Jul 20, 4:18 PM EDT, 37 minutes before

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Hazardous weather outlook, Jul 20, 4:35 PM EDT, 20 minutes before

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In the hours before

Special weather statement, Jul 20, 2:18 PM EDT, 2 hours 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WAKEFIELD VA
218 PM EDT WED JUL 20 2011

VAZ097-098-201900-
CHESAPEAKE VA-VIRGINIA BEACH VA-
218 PM EDT WED JUL 20 2011

...STRONG THUNDERSTORM OVER CHESAPEAKE AND SOUTHERN VIRGINIA BEACH...

AT 217 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM OVER FENTRESS...OR JUST WEST OF THE BACK BAY.
THE STORMS WERE NEARLY STATIONARY. THIS AREA OF HEAVY SHOWERS AND
STRONG THUNDERSTORMS WILL BE NEAR BACK BAY AT 230 PM EDT.

EXPECT FREQUENT CLOUD TO GROUND LIGHTNING AND HEAVY RAINFALL WITH
THESE STORMS. PONDING OF WATER ON ROADWAYS AND FLOODING OF LOW LYING
AND FLOOD PRONE AREAS IS ALSO POSSIBLE. IF YOU HEAR THUNDER...YOU ARE
CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE INTO A SAFE SHELTER
BEFORE THESE STORMS REACH YOUR AREA. REMAIN INDOORS UNTIL THE STORMS
HAVE PASSED.

LAT...LON 3655 7599 3655 7624 3676 7624 3675 7602

MMONTE

Special weather statement, Jul 20, 2:32 PM EDT, 2 hours 23 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WAKEFIELD VA
232 PM EDT WED JUL 20 2011

MDZ021>024-VAZ099-201930-
ACCOMACK VA-DORCHESTER MD-INLAND WORCESTER MD-SOMERSET MD-WICOMICO MD-
232 PM EDT WED JUL 20 2011

...STRONG THUNDERSTORMS OVER THE MARYLAND LOWER EASTERN SHORE...

AT 227 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
CLUSTERS OF THUNDERSTORM EXTENDING FROM JUST SOUTH OF SALISBURY TO
NEAR PRINCESS ANNE. THESE STORMS WERE NEARLY STATIONARY...AND WILL
CONTINUE TO IMPACT WICOMICO AND SOMERSET COUNTIES...MAINLY TO THE
EAST OF OCEAN HIGHWAY THROUGH 3 PM. ADDITIONAL ISOLATED THUNDERSTORM
DEVELOPMENT WILL BE POSSIBLE ACROSS THE LOWER EASTERN SHORE OVER THE
NEXT HOUR.

EXPECT FREQUENT CLOUD TO GROUND LIGHTNING AND HEAVY RAINFALL WITH
THESE STORMS. PONDING OF WATER ON ROADWAYS AND FLOODING OF LOW LYING
AND FLOOD PRONE AREAS IS ALSO POSSIBLE. IF YOU HEAR THUNDER...YOU ARE
CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE INTO A SAFE SHELTER
BEFORE THESE STORMS REACH YOUR AREA. REMAIN INDOORS UNTIL THE STORMS
HAVE PASSED.

LAT...LON 3780 7551 3780 7578 3786 7570 3786 7573
      3789 7571 3789 7576 3791 7577 3795 7567
      3797 7578 3795 7581 3805 7584 3806 7582
      3811 7586 3814 7584 3813 7586 3820 7588
      3822 7585 3823 7589 3833 7591 3835 7544

MMONTE

Local storm report, Jul 20, 3:18 PM EDT, 1 hour 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE WAKEFIELD VA
318 PM EDT WED JUL 20 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0305 PM     TSTM WND DMG     NORTHWEST               36.56N  76.20W
07/20/2011                   CITY OF CHESAPEAKE VA   COUNTY OFFICIAL

            POWER LINES REPORTED DOWN ALONG HIGHWAY 17...JUST EAST
            OF THE DISMAL SWAMP

&&

EVENT NUMBER AKQ1100120

05

Special weather statement, Jul 20, 3:44 PM EDT, 1 hour 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WAKEFIELD VA
344 PM EDT WED JUL 20 2011

NCZ014>016-032-202045-
CAMDEN NC-GATES NC-PASQUOTANK NC-PERQUIMANS NC-
344 PM EDT WED JUL 20 2011

...STRONG THUNDERSTORM MOVING INTO NORTHEAST NORTH CAROLINA...

AT 343 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
AREA OF STRONG THUNDERSTORMS NEAR LYNCHS CORNER...OR ABOUT OVER
MORGANS CORNER...MOVING SOUTHWEST AT 10 MPH. THE STRONG
THUNDERSTORMS WILL BE NEAR NICANOR AT 405 PM EDT...WHITESTON AND
SANDY CROSS AT 410 PM EDT...PEACH AT 415 PM EDT.

EXPECT SMALL HAIL...FREQUENT CLOUD TO GROUND LIGHTNING AND HEAVY
RAINFALL WITH THESE STORMS. PONDING OF WATER ON ROADWAYS AND
FLOODING OF LOW LYING AND FLOOD PRONE AREAS IS ALSO POSSIBLE. IF YOU
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE
INTO A SAFE SHELTER BEFORE THESE STORMS REACH YOUR AREA. REMAIN
INDOORS UNTIL THE STORMS HAVE PASSED.

LAT...LON 3619 7638 3639 7662 3652 7639 3643 7624

05

Special weather statement, Jul 20, 4:19 PM EDT, 36 minutes before

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Special weather statement, Jul 20, 4:51 PM EDT, 4 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 19, 8:34 PM EDT	Special Weather Statement	AKQ	Northumberland	36 min
Jul 19, 9:05 PM EDT	Special Weather Statement	AKQ	Northumberland, Westmoreland	55 min
Jul 19, 9:19 PM EDT	Severe Thunderstorm Warning	AKQ	Lancaster, Northumberland, Richmond, Westmoreland	41 min
Jul 19, 9:54 PM EDT	Severe Thunderstorm Warning	AKQ	Essex, King and Queen, Lancaster, Middlesex, Northumberland, Richmond	51 min
Jul 19, 10:53 PM EDT	Special Weather Statement	AKQ	Charles City, Essex, Gloucester, James City, King and Queen, King William and 5 more	52 min
Jul 20, 3:23 AM EDT	Excessive Heat Watch	AKQ	Accomack, Amelia, Brunswick, Caroline, Charles City, Cumberland and 30 more	24 hr
Jul 20, 2:18 PM EDT	Special Weather Statement	AKQ	City of Virginia Beach	42 min
Jul 20, 2:58 PM EDT	Severe Thunderstorm Warning	AKQ	City of Chesapeake	30 min
Jul 20, 4:26 PM EDT	Excessive Heat Warning	AKQ	Accomack, Amelia, Brunswick, Caroline, Charles City, Cumberland and 30 more	3 days
Jul 20, 4:26 PM EDT	Heat Advisory	AKQ	Accomack, Northampton, City of Virginia Beach	38 hr
Jul 20, 3:44 PM EDT	Special Weather Statement	AKQ	Pasquotank	61 min
Jul 20, 3:51 PM EDT	Severe Thunderstorm Warning	AKQ	Camden, Pasquotank, Perquimans	24 min
Jul 20, 4:19 PM EDT	Special Weather Statement	AKQ	Pasquotank, Perquimans	26 min
Jul 20, 4:51 PM EDT	Special Weather Statement	AKQ	Bertie	54 min
Jul 20, 2:32 PM EDT	Special Weather Statement	AKQ	Somerset	58 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2011 Every severe thunderstorm warning in 2011

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.