Alert archive / Virginia / Flash Flood Watches in 2021
Flash Flood Watch 10, NWS Blacksburg, VA
NWS Blacksburg, VA issued this flash flood watch at Sep 21, 2021, 5:59 AM EDT for 32 counties in Virginia; 7 counties in North Carolina. It took effect at Sep 21, 2021, 2:00 PM EDT. It was in force for 33 hr.
The area
The counties it named.
The facts
- Issued
- Sep 21, 2021, 5:59 AM EDT (09:59 UTC)
- In effect from
- Sep 21, 2021, 2:00 PM EDT
- Expired
- Sep 22, 2021, 10:49 PM EDT
- In force
- 33 hr
- Issued by
- NWS Blacksburg, VA
- Flood severity
- None
All 39 counties
Alleghany County, NC, Ashe County, NC, Rockingham County, NC, Stokes County, NC, Surry County, NC, Watauga County, NC, Wilkes County, NC, Alleghany County, VA, Amherst County, VA, Bath County, VA, Bedford County, VA, Bland County, VA, Botetourt County, VA, Campbell County, VA, Carroll 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, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Smyth County, VA, Wythe County, VA
The radar
The Roanoke radar (KFCX), 4 km from the middle of the area, began a volume at 09:59 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 00:00Z, 10.0 hours before the alert went out and 68 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.
- Mixed-layer CAPE
- 56 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 828 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
341 WGUS61 KRNK 210959 FFARNK URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Blacksburg VA 559 AM EDT Tue Sep 21 2021 NCZ001>003-018-019-VAZ009>020-022>024-032>035-043-211800- /O.NEW.KRNK.FF.A.0010.210921T1800Z-210922T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Ashe-Alleghany NC-Surry-Watauga-Wilkes-Smyth-Bland-Giles-Wythe- Pulaski-Montgomery-Grayson-Carroll-Floyd-Craig-Alleghany VA-Bath- Roanoke-Botetourt-Rockbridge-Patrick-Franklin-Bedford-Amherst-Henry- Including the cities of Roanoke, Wilkesboro, Sparta, Pulaski, Covington, Independence, Fincastle, Buena Vista, Floyd, Hot Springs, Clifton Forge, Wytheville, Whitetop, Bedford, Volney, Martinsville, Pearisburg, Blacksburg, West Jefferson, Lexington, Radford, Boone, Stuart, New Castle, Dobson, Rocky Mount, Galax, Salem, Marion, Amherst, Bland, and Troutdale 559 AM EDT Tue Sep 21 2021 ...FLASH FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH WEDNESDAY MORNING... The National Weather Service in Blacksburg has issued a * Flash Flood Watch for portions of North Carolina and Virginia, including the following areas, in North Carolina, Alleghany NC, Ashe, Surry, Watauga and Wilkes. In Virginia, Alleghany VA, Amherst, Bath, Bedford, Bland, Botetourt, Carroll, Craig, Floyd, Franklin, Giles, Grayson, Henry, Montgomery, Patrick, Pulaski, Roanoke, Rockbridge, Smyth and Wythe. * From 2 PM EDT this afternoon through Wednesday morning. * Deep tropical moisture will move across the central Appalachains this afternoon through tonight, supporting the potential for prolonged periods of heavy rain. Rainfall amounts will be highest along and near the crest of the Blue Ridge, where the terrain will enhance rainfall intensity in the southeasterly windflow. * Where high rainfall rates occur, or where bands of rain pass repeatedly over the same locations, rapid rises on smaller creeks and streams is expected. Some of these waterways may flood outside of their banks, and flow across roads and into low-lying areas. Depending on where the heaviest rain occurs, minor flooding of the larger main-stem rivers may be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ 16
10 follow-up statements
854 WGUS61 KRNK 211612 FFARNK Flood Watch National Weather Service Blacksburg VA 1212 PM EDT Tue Sep 21 2021 .Two main periods of moderate to heavy rain are expected across the Mid Atlantic region. The first will occur this afternoon through tonight. The next will be along and ahead of a cold front that will cross through the area on Wednesday. All of this rain will increase the threat for Flash Flooding. NCZ001>003-018-019-VAZ009>020-022>024-032>035-043-220030- /O.CON.KRNK.FF.A.0010.210921T1800Z-210922T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Ashe-Alleghany NC-Surry-Watauga-Wilkes-Smyth-Bland-Giles-Wythe- Pulaski-Montgomery-Grayson-Carroll-Floyd-Craig-Alleghany VA-Bath- Roanoke-Botetourt-Rockbridge-Patrick-Franklin-Bedford-Amherst-Henry- Including the cities of Roanoke, Wilkesboro, Sparta, Pulaski, Covington, Independence, Fincastle, Buena Vista, Floyd, Hot Springs, Clifton Forge, Wytheville, Whitetop, Bedford, Volney, Martinsville, Pearisburg, Blacksburg, West Jefferson, Lexington, Radford, Boone, Stuart, New Castle, Dobson, Rocky Mount, Galax, Salem, Marion, Amherst, Bland, and Troutdale 1212 PM EDT Tue Sep 21 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH WEDNESDAY MORNING... The Flash Flood Watch continues for * Portions of North Carolina and Virginia, including the following areas, in North Carolina, Alleghany NC, Ashe, Surry, Watauga and Wilkes. In Virginia, Alleghany VA, Amherst, Bath, Bedford, Bland, Botetourt, Carroll, Craig, Floyd, Franklin, Giles, Grayson, Henry, Montgomery, Patrick, Pulaski, Roanoke, Rockbridge, Smyth and Wythe. * Through Wednesday morning. * Deep tropical moisture will move across the central Appalachains this afternoon through tonight, supporting the potential for prolonged periods of moderate to heavy rain. Rainfall amounts will be highest along the crest of the Blue Ridge into the eastern foothills, where the terrain will enhance rainfall intensity and amounts. * Where high rainfall rates occur, or where bands of rain occur repeatedly over the same locations, rapid rises on smaller creeks and streams are expected. Some of these waterways may flood over their banks, and flow across roads and into low-lying areas. Depending on where the heaviest rain occurs, minor flooding of the larger main-stem rivers may be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ AS
174 WGUS61 KRNK 212359 FFARNK Flood Watch National Weather Service Blacksburg VA 759 PM EDT Tue Sep 21 2021 NCZ001>003-018-019-VAZ009>020-022>024-032>035-043-220900- /O.CON.KRNK.FF.A.0010.000000T0000Z-210922T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Ashe-Alleghany NC-Surry-Watauga-Wilkes-Smyth-Bland-Giles-Wythe- Pulaski-Montgomery-Grayson-Carroll-Floyd-Craig-Alleghany VA-Bath- Roanoke-Botetourt-Rockbridge-Patrick-Franklin-Bedford-Amherst-Henry- Including the cities of Roanoke, Wilkesboro, Sparta, Pulaski, Covington, Independence, Fincastle, Buena Vista, Floyd, Hot Springs, Clifton Forge, Wytheville, Whitetop, Bedford, Volney, Martinsville, Pearisburg, Blacksburg, West Jefferson, Lexington, Radford, Boone, Stuart, New Castle, Dobson, Rocky Mount, Galax, Salem, Marion, Amherst, Bland, and Troutdale 759 PM EDT Tue Sep 21 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH WEDNESDAY MORNING... The Flash Flood Watch continues for * Portions of North Carolina and Virginia, including the following areas, in North Carolina, Alleghany NC, Ashe, Surry, Watauga and Wilkes. In Virginia, Alleghany VA, Amherst, Bath, Bedford, Bland, Botetourt, Carroll, Craig, Floyd, Franklin, Giles, Grayson, Henry, Montgomery, Patrick, Pulaski, Roanoke, Rockbridge, Smyth and Wythe. * Through Wednesday morning. * Deep tropical moisture will continue to move across the central Appalachains tonight, supporting the potential for prolonged periods of moderate to heavy rain. Rainfall amounts will be highest along the crest of the Blue Ridge into the eastern foothills, where the terrain will enhance rainfall intensity and amounts. * Where high rainfall rates occur, or where bands of rain occur repeatedly over the same locations, rapid rises on smaller creeks and streams are expected. Some of these waterways may flood over their banks, and flow across roads and into low-lying areas. Depending on where the heaviest rain occurs, minor flooding of the larger main-stem rivers may be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ BMG
133 WGUS61 KRNK 220628 FFARNK Flood Watch National Weather Service Blacksburg VA 228 AM EDT Wed Sep 22 2021 NCZ001-018-VAZ009-220730- /O.CAN.KRNK.FF.A.0010.000000T0000Z-210922T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Ashe-Watauga-Smyth- Including the cities of Marion, West Jefferson, and Boone 228 AM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of northwest North Carolina and southwest Virginia, including the following areas, in northwest North Carolina, Ashe and Watauga. In southwest Virginia, Smyth has been cancelled. The Flash Flood Watch is cancelled. While additional rainfall is anticipated later today with a front, rainfall from it combined with previous rainfall should not be enough to exceed flash flood guidance. $$ NCZ002-003-019-VAZ010>020-022>024-032>035-043-221430- /O.CON.KRNK.FF.A.0010.000000T0000Z-210922T1500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Alleghany NC-Surry-Wilkes-Bland-Giles-Wythe-Pulaski-Montgomery- Grayson-Carroll-Floyd-Craig-Alleghany VA-Bath-Roanoke-Botetourt- Rockbridge-Patrick-Franklin-Bedford-Amherst-Henry- Including the cities of Roanoke, Wilkesboro, Sparta, Pulaski, Covington, Independence, Fincastle, Buena Vista, Floyd, Hot Springs, Clifton Forge, Wytheville, Whitetop, Bedford, Volney, Martinsville, Pearisburg, Blacksburg, Lexington, Radford, Stuart, New Castle, Dobson, Rocky Mount, Galax, Salem, Amherst, Bland, and Troutdale 228 AM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 11 AM EDT THIS MORNING... The Flash Flood Watch continues for * Portions of North Carolina and Virginia, including the following areas, in North Carolina, Alleghany NC, Surry and Wilkes. In Virginia, Alleghany VA, Amherst, Bath, Bedford, Bland, Botetourt, Carroll, Craig, Floyd, Franklin, Giles, Grayson, Henry, Montgomery, Patrick, Pulaski, Roanoke, Rockbridge and Wythe. * Until 11 AM EDT this morning. * Deep tropical moisture continues to move across the central Appalachains today, supporting the potential for prolonged periods of moderate to heavy rain. Likewise, a front will enter the region later today from the west, serving as a second producer for rainfall into the night. Rainfall amounts will be highest along the crest of the Blue Ridge into the eastern foothills where the terrain will enhance rainfall intensity and amounts. Areas that have already received ample rainfall will be far more prone to flooding, including parts of the southern Blue Ridge, New River Valley, and Roanoke Valley. * Where high rainfall rates occur, or where bands of rain occur repeatedly over the same locations, rapid rises on smaller creeks and streams are expected. Some of these waterways may flood over their banks and flow across roads and into low-lying areas. Depending on where the heaviest rain occurs, minor flooding of the larger main-stem rivers may be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ RR
101 WGUS61 KRNK 220635 FFARNK URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Blacksburg VA 235 AM EDT Wed Sep 22 2021 VAZ045-221445- /O.EXB.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Campbell- Including the cities of Lynchburg 235 AM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH THURSDAY MORNING... The National Weather Service in Blacksburg has expanded the * Flash Flood Watch to include a portion of central Virginia, including the following area, Campbell. * Through Thursday morning. * Deep tropical moisture continues to move across the central Appalachains today, supporting the potential for prolonged periods of moderate to heavy rain. Likewise, a front will enter the region later today from the west, serving as a second producer for rainfall into the night. Rainfall amounts will be highest along the crest of the Blue Ridge into the eastern foothills where the terrain will enhance rainfall intensity and amounts. Areas that have already received ample rainfall will be far more prone to flooding, including parts of the southern Blue Ridge, New River Valley, and Roanoke Valley. * Where high rainfall rates occur, or where bands of rain occur repeatedly over the same locations, rapid rises on smaller creeks and streams are expected. Some of these waterways may flood over their banks and flow across roads and into low-lying areas. Depending on where the heaviest rain occurs, minor flooding of the larger main-stem rivers may be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ NCZ002-003-019-VAZ010>020-022>024-032>035-043-221445- /O.EXT.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Alleghany NC-Surry-Wilkes-Bland-Giles-Wythe-Pulaski-Montgomery- Grayson-Carroll-Floyd-Craig-Alleghany VA-Bath-Roanoke-Botetourt- Rockbridge-Patrick-Franklin-Bedford-Amherst-Henry- Including the cities of Roanoke, Wilkesboro, Sparta, Pulaski, Covington, Independence, Fincastle, Buena Vista, Floyd, Hot Springs, Clifton Forge, Wytheville, Whitetop, Bedford, Volney, Martinsville, Pearisburg, Blacksburg, Lexington, Radford, Stuart, New Castle, Dobson, Rocky Mount, Galax, Salem, Amherst, Bland, and Troutdale 235 AM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH THURSDAY MORNING... The Flash Flood Watch is now in effect for * Portions of North Carolina and Virginia, including the following areas, in North Carolina, Alleghany NC, Surry and Wilkes. In Virginia, Alleghany VA, Amherst, Bath, Bedford, Bland, Botetourt, Carroll, Craig, Floyd, Franklin, Giles, Grayson, Henry, Montgomery, Patrick, Pulaski, Roanoke, Rockbridge and Wythe. * Through Thursday morning. * Deep tropical moisture continues to move across the central Appalachains today, supporting the potential for prolonged periods of moderate to heavy rain. Likewise, a front will enter the region later today from the west, serving as a second producer for rainfall into the night. Rainfall amounts will be highest along the crest of the Blue Ridge into the eastern foothills where the terrain will enhance rainfall intensity and amounts. Areas that have already received ample rainfall will be far more prone to flooding, including parts of the southern Blue Ridge, New River Valley, and Roanoke Valley. * Where high rainfall rates occur, or where bands of rain occur repeatedly over the same locations, rapid rises on smaller creeks and streams are expected. Some of these waterways may flood over their banks and flow across roads and into low-lying areas. Depending on where the heaviest rain occurs, minor flooding of the larger main-stem rivers may be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ RR
924 WGUS61 KRNK 221209 FFARNK URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Blacksburg VA 809 AM EDT Wed Sep 22 2021 NCZ004-005-VAZ044-222015- /O.EXA.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Stokes-Rockingham-Pittsylvania- Including the cities of Eden, Danbury, and Danville 809 AM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH THURSDAY MORNING... The National Weather Service in Blacksburg has expanded the * Flash Flood Watch to include portions of north central North Carolina and south central Virginia, including the following areas, in north central North Carolina, Rockingham and Stokes. In south central Virginia, Pittsylvania. * Through Thursday morning. * Deep tropical moisture continues to move across the central Appalachains today, supporting the potential for prolonged periods of moderate to heavy rain. Likewise, a front will enter the region later today from the west, serving as a second producer for rainfall into the night. Rainfall amounts will be highest along the crest of the Blue Ridge into the eastern foothills where the terrain will enhance rainfall intensity and amounts. Areas that have already received ample rainfall will be far more prone to flooding. * Where high rainfall rates occur, or where bands of rain occur repeatedly over the same locations, rapid rises on smaller creeks and streams are expected. Some of these waterways may flood over their banks and flow across roads and into low-lying areas. Depending on where the heaviest rain occurs, minor flooding of the larger main-stem rivers may be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ NCZ002-003-019-VAZ010>020-022>024-032>035-043-045-222015- /O.CON.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Alleghany NC-Surry-Wilkes-Bland-Giles-Wythe-Pulaski-Montgomery- Grayson-Carroll-Floyd-Craig-Alleghany VA-Bath-Roanoke-Botetourt- Rockbridge-Patrick-Franklin-Bedford-Amherst-Henry-Campbell- Including the cities of Roanoke, Wilkesboro, Sparta, Pulaski, Covington, Independence, Fincastle, Buena Vista, Floyd, Hot Springs, Clifton Forge, Lynchburg, Wytheville, Whitetop, Bedford, Volney, Martinsville, Pearisburg, Blacksburg, Lexington, Radford, Stuart, New Castle, Dobson, Rocky Mount, Galax, Salem, Amherst, Bland, and Troutdale 809 AM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of North Carolina and Virginia, including the following areas, in North Carolina, Alleghany NC, Surry and Wilkes. In Virginia, Alleghany VA, Amherst, Bath, Bedford, Bland, Botetourt, Campbell, Carroll, Craig, Floyd, Franklin, Giles, Grayson, Henry, Montgomery, Patrick, Pulaski, Roanoke, Rockbridge and Wythe. * Through Thursday morning. * Deep tropical moisture continues to move across the central Appalachains today, supporting the potential for prolonged periods of moderate to heavy rain. Likewise, a front will enter the region later today from the west, serving as a second producer for rainfall into the night. Rainfall amounts will be highest along the crest of the Blue Ridge into the eastern foothills where the terrain will enhance rainfall intensity and amounts. Areas that have already received ample rainfall will be far more prone to flooding, including parts of the southern Blue Ridge, New River Valley, and Roanoke Valley. * Where high rainfall rates occur, or where bands of rain occur repeatedly over the same locations, rapid rises on smaller creeks and streams are expected. Some of these waterways may flood over their banks and flow across roads and into low-lying areas. Depending on where the heaviest rain occurs, minor flooding of the larger main-stem rivers may be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ KK
630 WGUS61 KRNK 221847 FFARNK Flood Watch National Weather Service Blacksburg VA 247 PM EDT Wed Sep 22 2021 .Periods of moderate to heavy rain will be making a return to the region this afternoon and evening as a strong cold front pushes through. The heaviest rain looks to setup along the Blue Ridge into the southern Shenandoah Valley where the front looks to slow down later this evening into tonight. Additional rainfall amounts of one to two inches are expected. Locally heavier mounts are possible especially where bands of rain train and upslope is maximized. NCZ002>005-019-VAZ010>020-022>024-032>035-043>045-230415- /O.CON.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Alleghany NC-Surry-Stokes-Rockingham-Wilkes-Bland-Giles-Wythe- Pulaski-Montgomery-Grayson-Carroll-Floyd-Craig-Alleghany VA-Bath- Roanoke-Botetourt-Rockbridge-Patrick-Franklin-Bedford-Amherst-Henry- Pittsylvania-Campbell- Including the cities of Roanoke, Wilkesboro, Sparta, Pulaski, Covington, Danville, Independence, Fincastle, Buena Vista, Danbury, Floyd, Hot Springs, Clifton Forge, Lynchburg, Wytheville, Whitetop, Eden, Volney, Martinsville, Pearisburg, Blacksburg, Lexington, Radford, Stuart, Bedford, New Castle, Dobson, Rocky Mount, Galax, Salem, Amherst, Bland, and Troutdale 247 PM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of North Carolina and Virginia, including the following areas, in North Carolina, Alleghany NC, Rockingham, Stokes, Surry and Wilkes. In Virginia, Alleghany VA, Amherst, Bath, Bedford, Bland, Botetourt, Campbell, Carroll, Craig, Floyd, Franklin, Giles, Grayson, Henry, Montgomery, Patrick, Pittsylvania, Pulaski, Roanoke, Rockbridge and Wythe. * Through Thursday morning. * Deep tropical moisture continues to move across the central Appalachians this afternoon, supporting the potential for prolonged periods of moderate to heavy rain. Likewise, a front will enter the region this afternoon and evening from the west, serving as a secondary producer for rainfall into the night. Rainfall amounts will be highest along the crest of the Blue Ridge into the eastern foothills where the terrain will enhance rainfall intensity and amounts. Areas that have already received ample rainfall will be far more prone to flooding, including parts of the southern Blue Ridge, New River Valley, and Roanoke Valley. * Where high rainfall rates occur, or where bands of rain occur repeatedly over the same locations, rapid rises on smaller creeks and streams are expected. Some of these waterways may flood over their banks and flow across roads and into low-lying areas. Depending on where the heaviest rain occurs, minor flooding of the larger main-stem rivers may be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ ET
152 WGUS61 KRNK 222154 FFARNK Flood Watch National Weather Service Blacksburg VA 554 PM EDT Wed Sep 22 2021 NCZ002-019-VAZ010>013-015-016-222300- /O.CAN.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Alleghany NC-Wilkes-Bland-Giles-Wythe-Pulaski-Grayson-Carroll- Including the cities of Sparta, Wilkesboro, Bland, Pearisburg, Wytheville, Radford, Pulaski, Independence, Whitetop, Troutdale, Volney, and Galax 554 PM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of northwest North Carolina and southwest Virginia has been cancelled. The threat of heavy rainfall which would lead to flash flooding is over. $$ NCZ003>005-VAZ014-017>020-022>024-032>035-043>045-230600- /O.CON.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Surry-Stokes-Rockingham-Montgomery-Floyd-Craig-Alleghany VA-Bath- Roanoke-Botetourt-Rockbridge-Patrick-Franklin-Bedford-Amherst- Henry-Pittsylvania-Campbell- Including the cities of Dobson, Danbury, Eden, Blacksburg, Floyd, New Castle, Clifton Forge, Covington, Hot Springs, Roanoke, Salem, Fincastle, Lexington, Buena Vista, Stuart, Rocky Mount, Bedford, Amherst, Martinsville, Danville, and Lynchburg 554 PM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of north central North Carolina and Virginia, including the following areas, in north central North Carolina, Rockingham, Stokes, and Surry. In Virginia, Alleghany VA, Amherst, Bath, Bedford, Botetourt, Campbell, Craig, Floyd, Franklin, Henry, Montgomery, Patrick, Pittsylvania, Roanoke, and Rockbridge. * Through Thursday morning * Deep tropical moisture ahead of a cold front continues to move across the mid- Atlantic this afternoon, supporting the potential for prolonged periods of moderate to heavy rain. Rainfall amounts will be highest along and east of the Blue Ridge. Areas that have already received ample rainfall will be far more prone to flooding, including parts of the southern Blue Ridge and Roanoke Valley. * Where high rainfall rates occur, or where bands of rain occur repeatedly over the same locations, rapid rises on smaller creeks and streams are expected. Some of these waterways may flood over their banks and flow across roads and into low- lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
517 WGUS61 KRNK 222331 FFARNK Flood Watch National Weather Service Blacksburg VA 731 PM EDT Wed Sep 22 2021 NCZ003-004-VAZ014-017-032-230045- /O.CAN.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Surry-Stokes-Montgomery-Floyd-Patrick- Including the cities of Dobson, Danbury, Blacksburg, Floyd, and Stuart 731 PM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of north central North Carolina and southwest Virginia has been cancelled. Heavy rain has exited the area and no longer poses a flash flood threat. $$ NCZ005-VAZ018>020-022>024-033>035-043>045-230745- /O.CON.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Rockingham-Craig-Alleghany VA-Bath-Roanoke-Botetourt-Rockbridge- Franklin-Bedford-Amherst-Henry-Pittsylvania-Campbell- Including the cities of Eden, New Castle, Clifton Forge, Covington, Hot Springs, Roanoke, Salem, Fincastle, Lexington, Buena Vista, Rocky Mount, Bedford, Amherst, Martinsville, Danville, and Lynchburg 731 PM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THURSDAY MORNING... The Flash Flood Watch continues for * Portions of north central North Carolina and Virginia, including the following areas, in north central North Carolina, Rockingham. In Virginia, Alleghany VA, Amherst, Bath, Bedford, Botetourt, Campbell, Craig, Franklin, Henry, Pittsylvania, Roanoke, and Rockbridge. * Through Thursday morning * Bands of heavier showers and a few thunderstorms along and ahead of a front will bring a threat of flash flooding into tonight. * Where high rainfall rates occur, or where bands of rain occur repeatedly over the same locations, rapid rises on smaller creeks and streams are expected. Some of these waterways may flood over their banks and flow across roads and into low- lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
516 WGUS61 KRNK 230052 FFARNK Flood Watch National Weather Service Blacksburg VA 852 PM EDT Wed Sep 22 2021 VAZ018>020-022-023-033-043-230200- /O.CAN.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Craig-Alleghany VA-Bath-Roanoke-Botetourt-Franklin-Henry- Including the cities of New Castle, Clifton Forge, Covington, Hot Springs, Roanoke, Salem, Fincastle, Rocky Mount, and Martinsville 852 PM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of south central Virginia, southwest Virginia, and west central Virginia has been cancelled. No additional heavy rain or flash flooding is expected, therefore the watch has been cancelled. $$ NCZ005-VAZ024-034-035-044-045-230900- /O.CON.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Rockingham-Rockbridge-Bedford-Amherst-Pittsylvania-Campbell- Including the cities of Eden, Lexington, Buena Vista, Bedford, Amherst, Danville, and Lynchburg 852 PM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 AM EDT THURSDAY... The Flash Flood Watch continues for * Portions of north central North Carolina and Virginia, including the following areas, in north central North Carolina, Rockingham. In Virginia, Amherst, Bedford, Campbell, Pittsylvania, and Rockbridge. * Until 8 AM EDT Thursday * Bands of heavier showers and a few thunderstorms along and ahead of a front will bring a threat of flash flooding tonight. * Where high rainfall rates occur, or where bands of rain occur repeatedly over the same locations, rapid rises on smaller creeks and streams are expected. Some of these waterways may flood over their banks and flow across roads and into low- lying areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
962 WGUS61 KRNK 230249 FFARNK Flood Watch National Weather Service Blacksburg VA 1049 PM EDT Wed Sep 22 2021 NCZ005-VAZ024-034-035-044-045-230400- /O.CAN.KRNK.FF.A.0010.000000T0000Z-210923T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Rockingham-Rockbridge-Bedford-Amherst-Pittsylvania-Campbell- Including the cities of Eden, Lexington, Buena Vista, Bedford, Amherst, Danville, and Lynchburg 1049 PM EDT Wed Sep 22 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of north central North Carolina and Virginia has been cancelled. Heavy rain and flash flood threat has ended, therefore the watch has been cancelled. $$
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 Sep 21, 4:57 AM EDT, 1 hour 2 minutes earlier.
Area forecast discussion, Sep 21, 4:57 AM EDT, 1 hour 2 minutes before
Area Forecast Discussion
National Weather Service Blacksburg VA
457 AM EDT Tue Sep 21 2021
.SYNOPSIS...
Easterly winds will remain in place today and tonight, drawing
deep tropical moisture across the region to support the
potential for heavy rain and localized flooding. A strong cold
front will pass across the region on Wednesday afternoon and
evening, with cool and dry high pressure settling in for the
latter half of the week.
&&
.NEAR TERM /THROUGH WEDNESDAY/...
As of 430 AM EDT Tuesday...
...Heavy rain is possible today and tonight...
Starting the day off with persistent southeasterly winds which
have been carrying increasingly deep Atlantic moisture across
the mountains. Cloud cover remains widespread, with spotty
showers developing across the mountains. The moist air has also
maintained mild temperatures, generally holding in the low to
mid 60s to start the day.
Rain chances will increase from west to east through the morning
as the axis of deepest tropical moisture, which had been
situated more across the Tennessee Valley, crosses the central
Appalachians. This deep moisture will support the development of
locally heavy showers, and possibly a few storms, heading into
late afternoon through the overnight hours of tonight. A couple
of concerns will be terrain enhancement of rainfall amounts,
especially along the Blue Ridge, where the sharp increase in
elevation will support locally heavy rainfall. The other concern
is the potential for bands of heavy rain to pass repeatedly
across the same locations. Either of these concerns may cause
small streams to rise quickly, potentially flooding out of their
banks. As a result, a flash flood watch has been issued for
counties on either side of the Blue Ridge from North Carolina
into northern Virginia through Wednesday morning.
By sunrise Wednesday morning, the axis of heaviest rainfall is
expected to have shifted just to the east of our area, allowing
winds to become more southerly/southwesterly. Believe this will
result in a lull in the heavy rainfall, though spotty showers
are likely to remain. By early afternoon, A strong cold front
will make its way across the mountains from the west.
Thunderstorms developing ahead of the front will have the
potential of producing strong to locally damaging wind gusts, as
well as more locally heavy rain. As the front continues east,
it will pass across the Piedmont during the evening, with much
drier air arriving across the mountains as high pressure makes
its way in.
&&
.SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/...
As of 300 AM EDT Tuesday...
...Front's Departure Followed By Cooler, Drier Weather...
Guidance remains rather divided on departure of the front
Wednesday night into Thursday as GFS remains very fast whilst
NAM and ECMWF run slower. Same thing with the Canadian. It's
even apparent that CAMs are struggling with speed as many don't
cover the whole event, but there are obvious differences in
speed when considering the relationship between the prefrontal
rainfall for today and the front. Forecast has been updated to
support a somewhat middle ground. Most rainfall will start
wrapping up sunrise Thursday, with some lingering moisture in
the east through the morning.
Cooler air with a much drier airmass funnel into the area
Thursday with slightly breezy conditions expected. This airmass
will drop temperatures to below normal, where they'll stay for
several days. So long as winds fully slack Thursday night, many
will dip into the 40s with 30's possible in parts of the
mountains. Dry weather persists into Friday.
Forecast confidence is moderate.
&&
.LONG TERM /FRIDAY NIGHT THROUGH MONDAY/...
As of 300 AM EDT Tuesday...
...Dry Weather Persists With Reinforcing Front Over The Weekend...
Overall a quiet period of the forecast. Ridging tries to take
hold of the area, but upper NW flow will persist up to when our
next front moves through the area late Saturday into Sunday.
Little to no rainfall expected with this front: just plan for
increasing clouds, especially along the western slopes.
After the weekend's front, ridging can finally take hold of the
area and we see temperatures gradually warming going into the
start of next work week. With the northern stream finally
becoming more active and reaching further south, we see yet
another trough dipping south mid week, potentially bringing
showers to the area. However, based on ensemble guidance, have
left POPs out leaning toward slower solutions bringing rain
chances Tuesday night into Wendesday which falls outside of
this forecast package.
Forecast confidence is high.
&&
.AVIATION /08Z TUESDAY THROUGH SATURDAY/...
As of 205 AM EDT Tuesday...
Low MVFR to IFR ceilings have redeveloped across the mountains
and foothills this morning, while portions of the Piedmont
remain VFR for the time being. Expect low stratus to develop
across the Piedmont before sunrise as well. Otherwise, easterly
winds continue to draw deep moisture off the Atlantic,
supporting pockets of drizzle and light fog across the
mountains. Expect these conditions to persist through the night.
Also noted a southeasterly low level jet has developed across
northwest North Carolina into western Virginia, where gusts in
the vicinity of TNB/BLF/BKW are occasionally reaching as high as
25kt.
Through today, rain will increase in coverage from west to east
across the forecast area, becoming locally heavy at times to
reduce visibilities as low as 1SM. Only modest improvements in
ceiling bases are expected, with MVFR and IFR conditions
expected to remain common/widespread through the day. Little
change in wind direction expected, predominantly from the
east/southeast, though gusts across the western portion of the
forecast area will subside by late morning as the low level jet
diminishes.
Overnight brings the potential for heavy rain as a warm front
lift northward across the area. The deep moisture in place will
support prolonged periods of what may be heavy rain at times,
especially along the Blue Ridge where the terrain will enhance
rainfall intensity/amounts. Again, MVFR/IFR conditions will be
widespread through the overnight. Toward dawn, winds will begin
to shift southerly/southwesterly, beginning in the mountains
first and working across the Piedmont, as the warm front passes
across the area.
Extended Aviation Discussion...
A strong cold front will pass across the central Appalachians on
Wednesday/Wednesday evening, bringing the potential for another
round of heavy rain as the front passes. Thereafter, high
pressure/drier air will build in from the west, bringing
substantial improvement to flying conditions that will persist
into the weekend.
&&
.RNK WATCHES/WARNINGS/ADVISORIES...
VA...Flood Watch from 2 PM EDT this afternoon through Wednesday
morning for VAZ009>020-022>024-032>035-043.
NC...Flood Watch from 2 PM EDT this afternoon through Wednesday
morning for NCZ001>003-018-019.
WV...None.
&&
SYNOPSIS...NF
NEAR TERM...NF/WP
SHORT TERM...RR
LONG TERM...RR
AVIATION...BMG/NFHazardous weather outlook, Sep 21, 5:20 AM EDT, 39 minutes before
Hazardous Weather Outlook National Weather Service Blacksburg VA 520 AM EDT Tue Sep 21 2021 WVZ042>044-507-508-220930- Mercer-Summers-Monroe-Eastern Greenbrier-Western Greenbrier- 520 AM EDT Tue Sep 21 2021 This Hazardous Weather Outlook is for southeast West Virginia. .DAY ONE...Today and tonight. Showers and a few thunderstorms will pass across the area today and tonight, bringing the potential for heavy rain and localized flooding of small creeks and streams, as well as in poor drainage areas. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. A strong cold front will pass across the central Appalachians on Wednesday afternoon and evening. Strong thunderstorms developing ahead of the cold front have the potential of producing locally heavy rainfall that may result in flooding, damaging winds, and even an isolated tornado. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Reports should be submitted by phone by calling 1-866-215-4324, social media, by email at rnk.skywarn@noaa.gov or online at www.weather.gov/rnk. VAZ007-220930- Tazewell- 520 AM EDT Tue Sep 21 2021 This Hazardous Weather Outlook is for southwest Virginia. .DAY ONE...Today and tonight. Showers and a few thunderstorms will pass across the area today and tonight, bringing the potential for heavy rain and localized flooding of small creeks and streams, as well as in poor drainage areas. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. A strong cold front will pass across the central Appalachians on Wednesday afternoon and evening. Strong thunderstorms developing ahead of the cold front have the potential of producing locally heavy rainfall that may result in flooding and damaging winds. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Reports should be submitted by phone by calling 1-866-215-4324, social media, by email at rnk.skywarn@noaa.gov or online at www.weather.gov/rnk. NCZ001>003-018-019-VAZ009>020-022>024-032>035-043-220930- Ashe-Alleghany NC-Surry-Watauga-Wilkes-Smyth-Bland-Giles-Wythe- Pulaski-Montgomery-Grayson-Carroll-Floyd-Craig-Alleghany VA-Bath- Roanoke-Botetourt-Rockbridge-Patrick-Franklin-Bedford-Amherst-Henry- 520 AM EDT Tue Sep 21 2021 ...FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH WEDNESDAY MORNING... 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. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flood Watch. Periods of heavy rain will be possible today and tonight as deep tropical moisture passes across the Blue Ridge. Where rain bands develop repeatedly across the same locations, or where high rainfall rates occur, small creeks and streams may quickly flood out of their banks and across roadways and inundate low lying areas. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Flood Watch. A strong cold front will pass across the central Appalachians on Wednesday afternoon and evening. Strong thunderstorms developing ahead of the cold front have the potential of producing locally heavy rainfall and damaging winds. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Reports should be submitted by phone by calling 1-866-215-4324, social media, by email at rnk.skywarn@noaa.gov or online at www.weather.gov/rnk. NCZ004>006-020-VAZ044>047-058-059-220930- Stokes-Rockingham-Caswell-Yadkin-Pittsylvania-Campbell-Appomattox- Buckingham-Halifax-Charlotte- 520 AM EDT Tue Sep 21 2021 This Hazardous Weather Outlook is for north central North Carolina, northwest North Carolina, central Virginia and south central Virginia. .DAY ONE...Today and tonight. Showers and a few thunderstorms will pass across the area today and tonight, bringing the potential for heavy rain and localized flooding of small creeks and streams, as well as in poor drainage areas. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. A strong cold front will pass across the Piedmont on Wednesday evening. Strong thunderstorms developing ahead of the cold front have the potential of producing locally heavy rainfall and strong wind gusts. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed. Reports should be submitted by phone by calling 1-866-215-4324, social media, by email at rnk.skywarn@noaa.gov or online at www.weather.gov/rnk.
The office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 4:11 AM EDT | Flood Watch | RNK | Alleghany, Amherst, Bath, Bedford, Bland, Botetourt and 22 more | 102 min |
| Sep 21, 4:15 PM EDT | Special Weather Statement | RNK | Charlotte, Halifax | 45 min |
| Sep 21, 4:53 PM EDT | Special Weather Statement | RNK | Charlotte | 37 min |
| Sep 21, 7:19 PM EDT | Areal Flood Advisory | RNK | Floyd, Patrick | 3 hr |
| Sep 21, 7:41 PM EDT | Special Weather Statement | RNK | Botetourt, Rockbridge, City of Lexington | 34 min |
Nearby
Flash Flood Watches in Virginia, 2021Flash Flood Watches in North Carolina, 2021Every flash flood watch in 2021
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.