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<br /> <br />URBAN DRAINAGE AND FLOOD CONTROL DISTRICT <br />FLASH FLOOD PREDICTION PROGRAM (F2P2) <br />MESSAGE DEFINITIONS <br /> <br />MESSAGE 1 (Nuisance Flood AdvisOlY) <br />This advisory message is to inform key people that weather conditions are such that nuisance <br />flooding of streets, low-lying areas, and small streams could develop later in the day. It will be <br />issued by PMS after consultations with NWS. If PMS considers the threat imminent, the message <br />will be identified as a RED FLOOD ALERT. <br /> <br />MESSAGE 2 (Flash Flood Watch) <br />This advisory message is to inform key people that either a Flash Flood Watch has been issued by <br />NWS or PMS believes that weather conditions are such that a life-threatening flash flood may <br />occur later in the day. Significant stream flooding and property damage is possible. PMS will add <br />any additional information that is available. <br /> <br />MESSAGE 3 (Flash Flood Warning) <br />This warning message will be issued to inform key people that a Flash Flood Warning has been <br />issued by NWS or PMS feels that a life-threatening flash flood is imminent. Significant stream <br />flooding and property damage is expected. PMS will add any additional information that is <br />available. This warning message should be disseminated as quickly as possible. <br /> <br />MESSAGE UPDATE <br />This message will be used by PMS to update any of the previous messages. For example, this <br />message can be used to narrow a watch or warning area as more information becomes available, or <br />to provide more site-specific data and direction during an event. If PMS considers the threat <br />imminent, the message will be identified as a RED FLOOD ALERT. <br /> <br />MESSAGE 4 (All Clear) <br />This message cancels the flood potential status. It is issued by PMS after consultation with NWS <br />and other entities involved with direct PMS communications. <br /> <br />CONCERNING RED FLOOD ALERT <br />The term RED FLOOD ALERT is used when PMS believes that a flooding rainstorm is imminent. When <br />a MESSAGE 2 is in effect, RED FLOOD ALERT may be used with a MESSAGE UPDATE to indicate <br />imminent nuisance flooding that does not warrant a MESSAGE 3. When a MESSAGE 3 is in effect, RED <br />FLOOD ALERT may be used with a MESSAGE UPDATE to indicate that an approaching storm is <br />expected to cause nuisance flooding outside the warning area. In summary, RED FLOOD ALERTS are <br />short lead notifications of imminent flood threats (low to moderate risk to life and property) that should be <br />disseminated as quickly as possible. <br /> <br />ABBREVIA nONS: <br />NWS.......National Weather Service <br />PMS .......Private Meteorological Service <br /> <br />NOTE: For Boulder County only, MESSAGE Numbers 1,2,3 and 4 will be issued as A, B, C and D respectively <br />to avoid confusion with their MACS operational "MODE" Numbers 1-4. <br />