Alert archive / Virginia / Flash Flood Watches in 2014

Flash Flood Watch 1, NWS Blacksburg, VA

April 28, 201437 counties in Virginia; 9 counties in North Carolina; Mercer County, Monroe County, Summers County, West Virginia

NWS Blacksburg, VA issued this flash flood watch at Apr 28, 2014, 3:16 PM EDT for 37 counties in Virginia; 9 counties in North Carolina; Mercer County, Monroe County, Summers County, West Virginia. It took effect at Apr 29, 2014, 4:00 AM EDT. It was in force for 43 hr.

The area

The counties it named.

The facts

Issued: Apr 28, 2014, 3:16 PM EDT (19:16 UTC)
In effect from: Apr 29, 2014, 4:00 AM EDT
Expired: Apr 30, 2014, 10:46 PM EDT
In force: 43 hr
Issued by: NWS Blacksburg, VA
Flood severity: None

All 49 counties

Alleghany County, NC, Ashe County, NC, Caswell County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Yadkin County, NC, Alleghany County, VA, Amherst County, VA, Appomattox County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Buckingham County, VA, Campbell County, VA, Carroll County, VA, Charlotte County, VA, City of Buena Vista, VA, City of Covington, VA, City of Danville, VA, City of Galax, VA, City of Lexington, VA, City of Lynchburg, VA, City of Martinsville, VA, City of Radford, VA, City of Roanoke, VA, City of Salem, VA, Craig County, VA, Floyd County, VA, Franklin County, VA, Giles County, VA, Grayson County, VA, Halifax County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Smyth County, VA, Tazewell County, VA, Wythe County, VA, Mercer County, WV, Monroe County, WV, Summers County, WV

The radar

The Roanoke radar (KFCX), 10 km from the middle of the area, began a volume at 19:16 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

Roanoke, VA (KRNK), launched 12:00Z, 7.3 hours before the alert went out and 61 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 765 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 248 m²/s²
0-3 km storm-relative helicity: 318 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 flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Blacksburg, VA wrote its last area forecast discussion before this flash flood watch went out at Apr 28, 1:47 PM EDT, 1 hour 29 minutes earlier.

Area forecast discussion, Apr 28, 1:47 PM EDT, 1 hour 29 minutes before

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Hazardous weather outlook, Apr 28, 4:19 AM EDT, 10 hours 57 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BLACKSBURG VA
419 AM EDT MON APR 28 2014

NCZ001>003-018>020-VAZ009>018-022>024-032>035-290830-
ASHE-ALLEGHANY NC-SURRY-WATAUGA-WILKES-YADKIN-SMYTH-BLAND-GILES-
WYTHE-PULASKI-MONTGOMERY-GRAYSON-CARROLL-FLOYD-CRAIG-ROANOKE-
BOTETOURT-ROCKBRIDGE-PATRICK-FRANKLIN-BEDFORD-AMHERST-
419 AM EDT MON APR 28 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL NORTH
CAROLINA...NORTHWEST NORTH CAROLINA...CENTRAL VIRGINIA...SOUTH
CENTRAL VIRGINIA...SOUTHWEST VIRGINIA AND WEST CENTRAL VIRGINIA.

.DAY ONE...TODAY AND TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

HEAVY RAINFALL IS LIKELY ESPECIALLY TUESDAY AFTERNOON INTO
WEDNESDAY WITH RAINFALL TOTALS OF 2 TO 3 INCHES WITH EVEN HIGHER
AMOUNTS POSSIBLE. POCKETS OF FLASH FLOODING OR SMALL STREAM
FLOODING ARE POSSIBLE BUT THE BETTER CHANCES APPEAR TO BE FOR
RIVER FLOODING.

IN ADDITION...THERE IS SLIGHT RISK OF SEVERE THUNDERSTORMS
WEDNESDAY. AT THIS TIME CONFIDENCE IS HIGHEST THAT THE PRIMARY
THREAT WILL BE FOR DAMAGING WINDS WITHIN LINES OF STORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

NCZ004>006-VAZ043>047-058-059-290830-
STOKES-ROCKINGHAM-CASWELL-HENRY-PITTSYLVANIA-CAMPBELL-APPOMATTOX-
BUCKINGHAM-HALIFAX-CHARLOTTE-
419 AM EDT MON APR 28 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL NORTH
CAROLINA...CENTRAL VIRGINIA AND SOUTH CENTRAL VIRGINIA.

.DAY ONE...TODAY AND TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

HEAVY RAINFALL IS LIKELY ESPECIALLY TUESDAY INTO WEDNESDAY WITH
RAINFALL TOTALS OF 2 TO 3 INCHES WITH EVEN HIGHER AMOUNTS
POSSIBLE. POCKETS OF FLASH FLOODING OR SMALL STREAM FLOODING ARE
POSSIBLE BUT THE BETTER CHANCES APPEAR TO BE FOR RIVER FLOODING.

IN ADDITION...THERE IS SLIGHT RISK OF SEVERE THUNDERSTORMS
BOTH TUESDAY AND WEDNESDAY. AT THIS TIME CONFIDENCE IS HIGHEST
THAT THE PRIMARY THREAT WILL BE FOR DAMAGING WINDS WITHIN LINES
OF STORMS ESPECIALLY ON WEDNESDAY. HOWEVER THERE IS ALSO A CHANCE
THAT SOME STORMS COULD PRODUCE TORNADOES ON WEDNESDAY AS WELL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

VAZ007-019-020-WVZ042>045-290830-
TAZEWELL-ALLEGHANY VA-BATH-MERCER-SUMMERS-MONROE-GREENBRIER-
419 AM EDT MON APR 28 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWEST VIRGINIA...WEST
CENTRAL VIRGINIA AND SOUTHEAST WEST VIRGINIA.

.DAY ONE...TODAY AND TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

HEAVY RAINFALL IS LIKELY ESPECIALLY TUESDAY INTO WEDNESDAY WITH
RAINFALL TOTALS OF 2 TO 3 INCHES WITH EVEN HIGHER AMOUNTS
POSSIBLE. POCKETS OF FLASH FLOODING OR SMALL STREAM FLOODING ARE
POSSIBLE BUT THE BETTER CHANCES APPEAR TO BE FOR RIVER FLOODING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.

In the hours before

Special weather statement, Apr 28, 2:25 PM EDT, 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BLACKSBURG VA
225 PM EDT MON APR 28 2014

VAZ014-017>019-022-023-034-281930-
ALLEGHANY VA-FLOYD VA-BEDFORD VA-BOTETOURT VA-ROANOKE VA-
MONTGOMERY VA-CRAIG VA-
225 PM EDT MON APR 28 2014

THE NATIONAL WEATHER SERVICE IN BLACKSBURG HAS ISSUED A

* SPECIAL WEATHER STATEMENT FOR...
  SOUTH CENTRAL ALLEGHANY COUNTY IN WEST CENTRAL VIRGINIA...
  NORTH CENTRAL FLOYD COUNTY IN SOUTHWEST VIRGINIA...
  WEST CENTRAL BEDFORD COUNTY IN SOUTH CENTRAL VIRGINIA...
  BOTETOURT COUNTY IN WEST CENTRAL VIRGINIA...
  ROANOKE COUNTY IN WEST CENTRAL VIRGINIA...
  EASTERN MONTGOMERY COUNTY IN SOUTHWEST VIRGINIA...
  CRAIG COUNTY IN SOUTHWEST VIRGINIA...

* UNTIL 330 PM EDT

* AT 223 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS
  TRACKING A BROKEN LINE OF THUNDERSTORMS ALONG A LINE EXTENDING
  FROM NEAR ORISKANY TO NEAR NEW CASTLE TO NEAR SHAWSVILLE...MOVING
  TO THE EAST AT 40 MPH.

* WIND GUSTS UP TO 30 MPH ARE EXPECTED WITH THESE STORMS ALONG WITH
  CLOUD TO GROUND LIGHTNING.

* LOCATIONS IMPACTED INCLUDE...
  ROANOKE...
  SALEM CITY...
  CATAWBA...
  BENT MOUNTAIN...
  AND BUCHANAN.

THIS INCLUDES THE SALEM FAIRGROUNDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT STAY IN THE OPEN OR SHELTER UNDER TREES WHEN LIGHTNING
THREATENS. SEEK SHELTER INSIDE A STURDY BUILDING OR IN A VEHICLE.

&&

LAT...LON 3767 7967 3765 7967 3762 7961 3758 7959
      3745 7972 3722 7984 3717 8000 3716 8009
      3711 8013 3701 8036 3747 8028 3775 8001
TIME...MOT...LOC 1819Z 257DEG 51KT 3765 7998 3751 8008 3715 8029

PH

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 2:25 PM EDT	Special Weather Statement	RNK	Botetourt, Craig, Roanoke, City of Roanoke, City of Salem	65 min
Apr 28, 4:33 PM EDT	Special Weather Statement	RNK	Tazewell	42 min
Apr 28, 4:52 PM EDT	Special Weather Statement	RNK	Tazewell	53 min
Apr 28, 4:54 PM EDT	Special Weather Statement	RNK	Smyth	36 min
Apr 28, 5:06 PM EDT	Severe Thunderstorm Warning	RNK	Tazewell	39 min
Apr 28, 5:12 PM EDT	Special Weather Statement	RNK	Grayson	48 min
Apr 28, 5:32 PM EDT	Special Weather Statement	RNK	Bland	28 min
Apr 28, 6:41 PM EDT	Special Weather Statement	RNK	Montgomery	34 min
Apr 28, 7:47 PM EDT	Special Weather Statement	RNK	Halifax	43 min
Apr 28, 5:04 PM EDT	Special Weather Statement	RNK	Ashe	26 min
Apr 28, 5:17 PM EDT	Special Weather Statement	RNK	Watauga	43 min

Nearby

Flash Flood Watches in Virginia, 2014 Flash Flood Watches in North Carolina, 2014 Flash Flood Watches in West Virginia, 2014 Every flash flood watch in 2014

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.