![]() In general, 6 hours after the rain has tapered to drizzle or ended, or 2 to 6 hours after the rain has ended and sunshine/clearing has begun. Issued as small as portion of city/town (short fused) to multiple counties (short and long fused).įor non-river events: Issued to inform the public that flooding will continue for several hours after the causative event has ended. reports of flooding, damage, etc.), and/or the reason for canceling the warning, watch, or advisory. The statement will contain the latest information on the event (i.e. Issued to follow up, or to cancel a Flash Flood Warning, Watch, or Advisory. Flash flooding would occur within 6 hours of the causative event. Issued when meteorological, soil, or hydrologic conditions indicate flash flooding is possible (as described above), or if a dam could fail and threaten life and property, but the threat does not yet appear imminent. Arroyos/streams overtopping banks sufficient to produce ≥6 inches of fast flowing water.≥6 inches of fast flowing water across roads.High water entering multiple structures sufficient to cause property damage.In general, a Flash Flood is defined as the following in Deep South Texas: Issued from areas as small as portions of cities to multiple counties. Issued to inform the public that flash flooding is imminent or occurring, generally within 6 hours after the causative event, when there is a rapid rise in water levels in urban areas, small drainages, or arroyos. Area can range from portion of city/town to multiple counties. This may include thunderstorms below severe limits, excessive lightning, a sharp wind shift associated with a cold front, rapid fog development, cold temperatures, etc. Issued to provide information concerning ongoing or imminent, generally within 2 to 6 hours, short term significant weather. Watches are usually in effect for several hours, with 6 hours being the most common, and are issued by county or coastal zone. ![]() Issued when conditions are favorable for the development of severe thunderstorms in and close to the watch area. Issued when conditions are favorable for the development of tornadoes in and close to the watch area. Includes important information on the progress of severe weather elements and/or the reason for ending the warning. Issued to follow up, trim, or to cancel a Tornado or Severe Thunderstorm Warning. Area affected can range from a portion of a city to multiple counties. Information in this warning includes where the storm is, where it is moving, and what towns/locations will be affected, and the primary threat associated with the storm. Severe thunderstorms can result in the loss of life and/or property. Issued when a thunderstorm produces hail 1 inch or larger in diameter and/or winds which equal or exceed 58 mph, or for the expecation of damage from said winds. ![]() Generally issued based on expected track of tornado, which may include multiple towns, cities, or counties. The warning will include where the tornado is, direction of movement, and what towns/locations will be in its path. Issued when a tornado is indicated by radar or sighted by storm spotters. The following table provides "hot links" to get you directly to particular hazard types that you'd like to investigate. As always, if you have any questions, e-mail us and we’ll help you as soon as possible. ![]() The right column explains the criteria, or threat level, for each hazard as they apply to residents and visitors to Deep South Texas and the Rio Grande Valley.įeel free to visit, and revisit, this page to refresh your memory on how to interpret the color codes and the weather hazard thresholds that our staff is basing the issuance of Watches, Warnings, and Advisories on. The left column displays each color type, along with the Product Inventory Code and the more important Valid Time Event Code, which is what the colors are triggered from. Unlocking the Mystery of the Watch/Warning/Advisory Web MapĮver want to know how to interpret the color codes on the Watch Warning Advisory and Point/Click map that resides below the weather–at–a–glance graphics ("graphicasts")? What follows is a comprehensive list of the color codes, associated text product codes, and the meaning of each watch, warning, advisory, and statement that we issue, and in some cases hope not to issue, from NWS Brownsville/Rio Grande Valley. ![]()
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