AMS 5Th Conference on Weather Warnings and Communication
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4.1 AMS 5th Conference on Weather Warnings and Communication PROPOSED IMPLEMENTATION OF WARN-ON-DETECTION FIRE WARNINGS FOR PUBLIC AND FIREFIGHTER SAFETY T. Todd Lindley*, David L. Andra, Richard D. Smith, Thomas S. Curl, Alexander B. Zwink, Douglas A. Speheger, and Ryan R. Barnes NOAA/National Weather Service – Norman, Oklahoma Drew C. Daily Oklahoma Forestry Services - Oklahoma City, Oklahoma Bradley R. Smith Texas A&M Forestry Service - Austin, Texas Paul G. Witsaman NOAA/National Weather Service/Southern Region Headquarters – Fort Worth, Texas 1. INTRODUCTION forestry fire analysts in Oklahoma and Texas jointly propose implementation of experimental The lack of fire-specific warning protocols to warn-on-detection fire warnings. The proposed influence public and firefighter safety has warnings communicate text and polygon garnered widespread attention following recent messages that identify potentially dangerous national wildfire disasters. Meanwhile, both wildfires similar to tornado, severe thunderstorm, scientific knowledge of dangerous wildfire and flash flood warnings for broadcast via the environments and the technology to remotely Emergency Alert System (EAS), and perhaps detect wildland fire ignition and behavior, have eventually via Wireless Emergency Alerts dramatically improved. Deployment of GOES- (WEA). 16/17, and their Advanced Baseline Imagers has revolutionized operational wildland fire detection This paper documents a collaborative process and monitoring capabilities. National Weather with forestry/fire/emergency agencies, as well as Service (NWS) forecasters have leveraged the development of warning decision aids and GOES-16/17 era technology to provide real-time forecaster training which demonstrate a notifications of wildfires since 2016 (Lindley et proposed path toward implementing warn-on- al. 2016). In many cases, hot spot notifications detection fire warnings. Forecaster decision are received prior to emergency 911 calls and making based upon satellite-derived signals of have facilitated rapid response to fires that extreme fire behavior during fire warning saved lives and property (NOAA 2018). simulations is evaluated. This process may serve as a prototype for future phenomenon- By applying combined knowledge of fire based fire warnings that modernize the current environments that support particularly red flag warning program toward an impacts- dangerous wildfires with expertise in high- based paradigm. resolution meteorological remote sensing technology to detect extreme fire behavior, and 2. BACKGROUND & PRESIDENCE the means to disseminate existing hazard messaging, NWS meteorologists and state Fire warning (FRW) is an existing NWS product governed by Directive NWSI 10-518 ______________________________________ B.4.9 as “a warning of a spreading structural fire or wildfire that threatens a populated area”. *Corresponding author: Todd Lindley, The directive further states “evacuation of areas National Weather Service, 120 David L. Boren in the fire’s path may be recommended by Blvd, Suite 2400, Norman, OK, 73072. authorized officials according to state law or [email protected] local ordinance” (NOAA, cited 2019). In operational practice, the NWS has only utilized immediate threat to life and property. These FRWs at the request of local officials as a warnings would supplement (not replace) legacy means to disseminate active evacuation FRWs that traditionally communicate evacuation information via the EAS. Since FRW information at the request of local officials. The implementation in 2006, a total of 350 warnings have been issued by 16 NWS Weather Forecast prototype warn-on-detection FRWs would be Offices (WFOs) through 2018 (Fig. 1). To-date, issued based upon predetermined satellite- 89% (313) of all FRWs have been issued by inferred signals of extreme wildland fire behavior WFOs that service Oklahoma and Texas. that occur within specified environmental parameters known to support damaging and life- threatening wildfires. a. Coordination, criteria, & logistics Extensive multiagency coordination occurred in proposal of warn-on-detection FRWs (Fig. 2a- h). Proof-of-concept tests were originally discussed with NWS regional administration during a series of meetings between WFO Norman management and NWS Southern Region Headquarters (SRH) between 7-17 December 2018. Oklahoma Forestry Services (OFS) and Texas A&M Forest Service (TAMFS) fire analysts convened at WFO Norman to Figure 1: Map showing the number of FRWs evaluate proposed environmental and remote issued per WFO between 2006 and 2018. sensing criteria and to test warning issuance procedures via a displaced real-time Weather 3. PROPOSED FRWs Event Simulator (WES) on 31 January and 1 February 2019. The simulations concluded with Recent interdisciplinary innovation in wildland a joint NWS/OFS/TAMFS meeting (with SRH fire has shown that tactical warnings for extreme representation) to establish a framework for fire behavior are possible (Lindley et al. 2018). multiagency agreement. A joint briefing to the Such capabilities exist in the operational Oklahoma State Forester was conducted on 4 environment where meteorologists possess February 2019. Warn-on-detection and unique data sets and quantifiable knowledge of: messaging concepts were then collaborated with the Oklahoma Department of Emergency • environmental parameters supportive of Management (OEM) during subsequent dangerous wildfire occurrence, simulations on 20 February 2019. WFO Norman • high-resolution remote sensing technology and OEM representatives then co-developed capable of detecting wildland fire ignition technical solutions for polygon dissemination, and extreme behavior, and and began preliminary discussion of future WEA • existing means and templates to activation for FRWs through the state operations disseminate hazard messages (FRW). center. Live demonstrations of FRW capabilities for local emergency managers began on 6 Foundational to the validity of proposed FRWs March 2019. Additional live demonstrations is a mutual respect for the expertise and core were conducted for NWS officials including the capabilities of partner agencies (NOAA 2013). A National Fire Weather Program Leader and multiagency agreement on science-based NWS Headquarters AFS Severe, Fire, and Winter Weather Branch Chief on 25 April 2019. methods for assessment of the fire environment To test operational readiness, one-on-one combined with timely interpretation of remotely training and forecaster warning decision sensed signals of extreme wildland fire behavior evaluations were conducted at WFO Norman by operational meteorologists was achieved. between 28 January and 14 May 2019. These The proposed FRWs would be issued for simulations focused on diagnosing extreme potentially dangerous wildfires that present an wildland fire behavior using GOES-16/17. Figure 2a-h: Examples of interagency collaboration invested in proposed FRW implementation, including: criteria evaluation and simulations with a) OFS, b) TAMFS, c) OFS/TAMFS/NWS joint policy session, d) Oklahoma State Forester briefing, e) OEM messaging/concept evaluation and simulation, f) OEM technical dissemination collaboration, g) local emergency manager demonstration and h) NWS Headquarters/Fire Weather Program Lead demonstration. Proposed warn-on-detection FRWs would be wind and relative humidity thresholds with reserved for candidate fires burning under minimal consideration of fuel state. In moist environmental conditions supportive of fuels, resistance to burning increases (as particularly damaging and life-threatening modeled by both weather and fuel moisture via wildfires. In the southern Great Plains, ERC-G) and intense fire weather (measured by investments have been made toward a body of RFTI) is required to yield significant fire research to aid predictive services and potential. Vice versa, as fuels dry and are more firefighting response (Pyne 2017). Some of this prone to fire, weaker weather results in an research (Lindley et al. 2011 and 2015) has equivalent significant fire potential (Fig. 3). supported adoption of nomogram guidance for fire danger statement (RFD) and fire weather watch/red flag warning (RFW) headline decisions based on energy release component percentiles (ERC, fuel model G, Bradshaw et al. 1983) and Red Flag Threat Index (RFTI, Murdoch et al. 2012). This paradigm allows meteorologists and fire analysts to assess significant fire potential via combined measures of weather and fuel moisture. Such total fire environment assessments more comprehensively quantify risks of problematic Figure 3: Simplistic graph relating fuel moisture extreme fire behavior when compared to and fire’s resistance to control to strength of traditional RFW criteria, which are based on weather required for significant fire potential. Figure 4: Fire headline decisional nomogram used in many southern Great Plains WFOs for fire danger statement (RFD), fire weather watch/red flag warning (RFW) issuances. Environments supporting a two- tiered FRW criteria are outlined in yellow and red. Consistent with past operational practice, Forecasters would have access to visual FRWs would continue to be issued at the guidance for temporal and spatial identification request of local or state officials for threatening of the FRW environmental parameter space. fire situations that occur outside of a restrictive Gridded ERC-G (provided by the Wildland Fire two-tiered fire environment parameter space for Assessment System, available online at: warn-on-detection