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NWS GSP Hydrology Products, Review and Application, NWS GSP Integrated Warning Team Meeting Charlotte

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2021-9-26 published at Science&Technology category

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1.NWS GSP Hydrology Products Review and Application NWS GSP Integrated Warning Team Meeting Charlotte, NC October 25, 2016
2.Hydrology Products 2016 Integrated Warning Team Meeting – Charlotte Hydrologic Outlook Outline WFO Greenville-Spartanburg Preparation Products Flood Watch Flash Flood Watch Take-Action Products Flood Advisory Flood Warning Flash Flood Warning Flash Flood Emergency a b c d a b c Severity & Lead Time Products & Streamgauges Typical product severity & lead time 1 2 3 4 River Fcst Gauges a Flash Flood Gauges b
3. Alert public/partners of increased likelihood of rapid (<6 hrs) stream & overland flooding; mainstem flooding possible, but secondary. Similar to Flood Watch, but be aware increased likelihood of rapid flooding may require an adjusted response plan. Nearly identical to Flood Watch, but mainstem flooding may not be expected or prioritized due to more convective nature of event. Flash Flood Watch Alert public/partners of increased likelihood of rapid (<6 hrs) stream & overland flooding; mainstem flooding possible, but secondary. Similar to Flood Watch, but be aware increased likelihood of rapid flooding may require an adjusted response plan. Nearly identical to Flood Watch, but mainstem flooding may not be expected or prioritized due to more convective nature of event. Alert public/partners of increased likelihood of “slow” (>6 hrs) stream & overland flooding; flash flood threat lower, but not zero. Closely monitor weather & river forecasts; finalize prep & warning action plan for flood-/slide-prone areas; assess travel/event plans; enhance coordination Headline; Synopsis; Affected Regions/Counties; Effective Time; Antecedent Conditions; Mainstem Flooding Details; Impact & Action Statements Flood Watch Hydrology Products Prepare – Take Action – Severity & Lead Time – Products & Streamgauges Preparation Products: Summary Products Purpose Desired Response Contents WFO Greenville-Spartanburg Alert public/partners of increased likelihood of “slow” (>6 hrs) stream & overland flooding; flash flood threat lower, but not zero. Closely monitor weather & river forecasts; finalize prep & warning action plan for flood-/slide-prone areas; assess travel/event plans; enhance coordination Headline; Synopsis; Affected Regions/Counties; Effective Time; Antecedent Conditions; Mainstem Flooding Details; Impact & Action Statements Inform public/partners of significant heavy rain & flood potential 24-48 hours to 7 days in advance of event Monitor latest forecasts; initial preparation for flood-prone areas; know warning response; begin coordination Headline; Expected Rainfall & Timing; Weather Synopsis; Antecedent Conditions; Impacts & Severity Hydrologic Outlook Inform public/partners of significant heavy rain & flood potential 24-48 hours to 7 days in advance of event Monitor latest forecasts; initial preparation for flood-prone areas; know warning response; begin coordination Headline; Expected Rainfall & Timing; Weather Synopsis; Antecedent Conditions; Impacts & Severity Hydrologic Outlook Flood Watch Flash Flood Watch TAKEAWAY: Flash Flood Watches are more commonly issued for W NC, Upstate SC, and NE GA due to topography and urban influences. TAKEAWAY: Flood/Flash Flood Watches highlight the area forecasters think flooding is most likely. This does NOT mean areas outside of the watch will be flood-free, just that the predicted threat is lower. TAKEAWAY: Flood and Flash Flood Watches differentiate between response times, NOT the severity of flooding.
4.Warn public/partners of rapid (<6 hrs) minor to record flooding Rapid flooding of smaller streams; sig. overland flooding & road closures; iso/scat structure flooding & road washouts Seek higher ground NOW; Turn Around, Don’t Drown; obey barricades; avoid flood-prone areas, crossings even if dry. Flash Flood Warning Seek higher ground NOW; Turn Around, Don’t Drown; obey barricades; avoid flood-prone areas, crossings even if dry. Warn public/partners of rapid (<6 hrs) minor to record flooding Rapid flooding of smaller streams; sig. overland flooding & road closures; iso/scat structure flooding & road washouts Flash Flood Warning Hydrology Products Prepare – Take Action – Severity & Lead Time – Products & Streamgauges Impacts Products Purpose Desired Response Take-Action Products: Summary WFO Greenville-Spartanburg Alert public/partners of nuisance flooding and/or streams just out of their banks Flooding from clogged or poor storm drainage; ponding within low-lying areas; minimal flooding of farmlands Use caution when driving; take property precautions; be alert/ready/prepared for more serious flooding (warnings) Flood Advisory Warn public/partners of “slow” (>6 hrs) minor, mod, major, or record stream & overland flooding Wide-ranging based on severity of flood; can include widespread/deep overland, road, & structure flooding Assess risk; move property to higher ground; Turn Around, Don’t Drown; obey barricades & official evacuations Flood Warning Elevate ongoing event for catastrophic rapid flooding; urge immediate life-saving measures Numerous swift water rescues & road/bridge washouts; significant structure flooding; ongoing evacuations; sig. dam failures Avoid warned area; strongly discourage travel within area; obey local official evacuations, orders (State of Emergency) Flash Flood Emergency Warn public/partners of “slow” (>6 hrs) minor, mod, major, or record stream & overland flooding Wide-ranging based on severity of flood; can include widespread/deep overland, road, & structure flooding Assess risk; move property to higher ground; Turn Around, Don’t Drown; obey barricades & official evacuations Flood Warning Elevate ongoing event for catastrophic rapid flooding; urge immediate life-saving measures Numerous swift water rescues & road/bridge washouts; significant structure flooding; ongoing evacuations; sig. dam failures Avoid warned area; strongly discourage travel within area; obey local official evacuations, orders (State of Emergency) Flash Flood Emergency Alert public/partners of nuisance flooding and/or streams just out of their banks Flooding from clogged or poor storm drainage; ponding within low-lying areas; minimal flooding of farmlands Use caution when driving; take property precautions; be alert/ready/prepared for more serious flooding (warnings) Flood Advisory Credit: US NPS Credit: USGS Credit: NCDOT Credit: NC National Guard
5.Flash Flood Warning Hydrology Products Prepare – Take Action – Severity & Lead Time – Products & Streamgauges Impacts Products Purpose Desired Response Take-Action Products: Summary WFO Greenville-Spartanburg Flood Warning Flash Flood Emergency Flood Advisory TAKEAWAY: Diversity of flood products exists to help provide an appropriate level of risk assessment and response to a diverse range of flood types based on severity and response time.
6.Hydrology Products Prepare – Take Action – Severity & Lead Time – Products & Streamgauges Severity Lead Time WFO Greenville-Spartanburg Flood Advisory Flood Warning Minor Moderate Major Time from Rainfall Onset 5-7 hours Flash Flood Emergency Flash Flood Warning Product 30 min 2 hrs 24 hrs 48 hrs FFE Flood Advisory Flood Warning FFW Flash Flood Watch Flood Watch Hydrologic Outlook Severity and Lead Time
7.Hydrographs, Impact Statements, Crest History, Photos: http://water.weather.gov/ahps2/index.php?wfo=gsp Hydrology Products Prepare – Take Action – Severity & Lead Time – Products & Streamgauges Products and Streamgauges: River Forecast Gauges WFO Greenville-Spartanburg Flood Warning Flood Watch Hydrologic Outlook Impact Verification: 1) Call EMs, media, etc. and review social media; 2) perform site visit/flood survey; 3) adjust impacts and flood stages as needed Flood Warning (FLW) Flood Advisory (FLS) For a given crest… Hydrologic Outlook Flood Watch Impact Verification: 1) Call EMs, media, etc. and review social media; 2) perform site visit/flood survey; 3) adjust impacts and flood stages as needed
8.Hydrographs, Impact Statements, Crest History, Photos: http://water.weather.gov/ahps2/index.php?wfo=gsp Hydrology Products Prepare – Take Action – Severity & Lead Time – Products & Streamgauges Products and Streamgauges: Flash Flood Gauges WFO Greenville-Spartanburg F FW Flash Flood Watch Transition to Flood Warning or Advisory if other flooding remains in area Flash Flood Warning (FFW) Flood Advisory (FLS) Flash Flood Emergency For a given crest… Impact Verification: 1) Call EMs, media, etc. and review social media; 2) adjust impacts and flood stages as needed
9.Hydrology Products Prepare – Take Action – Severity & Lead Time – Products & Streamgauges Products and Streamgauges: Takaways WFO Greenville-Spartanburg TAKEAWAY: Please share stream-based impacts with us to help us improve our impact statements and warnings! TAKEAWAY: Nearest forecast points to Charlotte: South Fork Catawba River at Lowell; and Rocky River at Norwood Forecasts provided by the Southeast River Forecast Center in Peachtree City, GA (www.weather.gov/serfc) Hydrographs, Impact Statements, Crest History, Photos: http://water.weather.gov/ahps2/index.php?wfo=gsp
10.Hydrology Products 2016 Integrated Warning Team Meeting – Charlotte The End WFO Greenville-Spartanburg joshua.palmer@noaa.gov Thank You! We look forward to working with you! Questions, Comments, Feedback? Please contact Joshua Palmer, Service Hydrologist

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