Alert archive / Virginia / Flash Flood Watches in 2018
Flash Flood Watch 14, NWS Blacksburg, VA
NWS Blacksburg, VA issued this flash flood watch at Sep 22, 2018, 1:36 PM EDT for 32 counties in Virginia. It took effect at Sep 22, 2018, 3:00 PM EDT. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- Sep 22, 2018, 1:36 PM EDT (17:36 UTC)
- In effect from
- Sep 22, 2018, 3:00 PM EDT
- Expired
- Sep 23, 2018, 4:00 AM EDT
- In force
- 13 hr
- Issued by
- NWS Blacksburg, VA
- Flood severity
- None
All 32 counties
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, Halifax County, VA, Henry County, VA, Montgomery County, VA, Patrick County, VA, Pittsylvania County, VA, Pulaski County, VA, Roanoke County, VA, Rockbridge County, VA, Wythe County, VA
The radar
The Roanoke radar (KFCX), 30 km from the middle of the area, began a volume at 17:37 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, 5.6 hours before the alert went out and 46 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
- 74 J/kg
- Mixed-layer CIN
- -100 J/kg
- Mixed-layer LCL
- 792 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 22, 10:17 AM EDT, 3 hours 19 minutes earlier.
Area forecast discussion, Sep 22, 10:17 AM EDT, 3 hours 19 minutes before
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</html>Hazardous weather outlook, Sep 22, 6:17 AM EDT, 7 hours 19 minutes before
Hazardous Weather Outlook National Weather Service Blacksburg VA 617 AM EDT Sat Sep 22 2018 NCZ001>006-018>020-VAZ007-009>020-022>024-032>035-043>047-058-059- WVZ042>044-507-508-231030- Ashe-Alleghany NC-Surry-Stokes-Rockingham-Caswell-Watauga-Wilkes- Yadkin-Tazewell-Smyth-Bland-Giles-Wythe-Pulaski-Montgomery-Grayson- Carroll-Floyd-Craig-Alleghany VA-Bath-Roanoke-Botetourt-Rockbridge- Patrick-Franklin-Bedford-Amherst-Henry-Pittsylvania-Campbell- Appomattox-Buckingham-Halifax-Charlotte-Mercer-Summers-Monroe- Eastern Greenbrier-Western Greenbrier- 617 AM EDT Sat Sep 22 2018 This Hazardous Weather Outlook is for north central North Carolina, northwest North Carolina, central Virginia, south central Virginia, southwest Virginia, west central Virginia and southeast West Virginia. .DAY ONE...Today and tonight. There is a slight risk for excessive rainfall today. Showers and thunderstorms this afternoon and evening will be very rain efficient and may cause localized flooding. .DAYS TWO THROUGH SEVEN...Sunday through Friday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The office that day
Everything else NWS Blacksburg, VA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 22, 4:22 PM EDT | Areal Flood Advisory | RNK | Montgomery, Roanoke, City of Roanoke, City of Salem | 4 hr |
| Sep 22, 5:33 PM EDT | Flash Flood Warning | RNK | Bedford, Botetourt, Franklin, Roanoke, City of Roanoke, City of Salem | 3 hr |
| Sep 22, 5:54 PM EDT | Areal Flood Advisory | RNK | Carroll, Floyd | 3 hr |
| Sep 22, 5:57 PM EDT | Special Weather Statement | RNK | Bland | 33 min |
| Sep 22, 6:02 PM EDT | Areal Flood Advisory | RNK | Bedford, Campbell | 3 hr |
| Sep 22, 7:04 PM EDT | Flash Flood Warning | RNK | Bedford, Campbell, Franklin, Pittsylvania | 3 hr |
| Sep 22, 7:27 PM EDT | Special Weather Statement | RNK | Pittsylvania | 63 min |
Nearby
Flash Flood Watches in Virginia, 2018Every flash flood watch in 2018
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.