The latest map of severe weather azards for our Coverage Area and the southeast. The image below updates in real-time as products are issued, but the page does not. A refresh may be required to see the latest image.
Weather Forecast Offices (WFOs) issue SVRs to provide the public and emergency managers with advance notice of damaging wind gusts and large hail. WFOs will issue SVRs when there is radar or satellite indication and/or reliable reports of wind gusts equal to or in excess of 50 knots (58 mph) and/or hail size of one inch (U.S. quarter-size) diameter or larger. WFOs may issue SVRs for a convective squall with little or no lightning that otherwise meet or exceed hail or wind warning criterion.
SVRs have valid time issuances of 30 to 60 minutes. For thunderstorms that are expected to remain severe beyond the valid time of the original warning, WFOs will issue a new warning.
SVRs will follow a standard bullet-style format with brief points of information, including:
- Type of warning (i.e., damaging wind and/or hail)
- Expiration time of the warning
- Locations used to identify threatened areas (i.e., larger towns, familiar landmarks, states, counties, mileage markers)
- Basis for warning; forecast impacts including hail sizes and wind gusts
- torm motion, in some instances pathcasts (during instances of when a forecaster has high confidence in the movement of hazardous weather)
- Call-to-Action statements (Precaution / Preparedness Actions)
SVRs will also, at times, include the following:
- The possibility of tornadoes if a Tornado Watch is in effect
- Recent credible reports of severe hail, wind gusts, or damage due to hail or wind
If a severe thunderstorm moves over coastal waters, then a Special Marine Warning will be issued.
Flash flood warnings are issued when flooding is imminent or likely. This product will be reserved for those short-term events which require immediate action to protect life and property, such as dangerous small stream or urban flooding and dam or levee failures. The geographic area covered, which is defined by a polygon, may be all or a portion of one or more counties, a river/stream basin, or any other type of definable area (e.g., a specific valley).
A flash flood warning will be issued for a geographical area defined by a polygon in a WFOs CWFA when:
- Flash flooding is reported; and/or
- A dam or levee failure is imminent or occurring; and/or
- A sudden failure of a naturally-caused stream obstruction (including debris slide, avalanche, or ice jam) is imminent or occurring, and/or
- Precipitation capable of causing flash flooding is indicated by radar, rain gages, and/or satellite; and/or
- Precipitation as indicated by radar, rain gages, satellite and/or other guidance is capable of causing debris flows, particularly (but not only) in burn areas; and/or
- Local monitoring and prediction tools indicate flash flooding is likely; and/or
- A hydrologic model indicates flash flooding for locations on small streams, or
- A previously issued flash flood warning needs to be extended in time, or
- Flash flooding is imminent or occurring in a geographical area currently not under a valid flash flood warning.
Flash flood warnings use a bullet format and will include:
- The immediate cause followed by the geographic areas of concern.
- Basis for the warning and expected impacts.
- Pathcast i.e., forecast timing of the flood with specific locations to be affected and the most flood-prone areas.
- Call-to-action statements will focus on avoiding flood dangers and not include instructions on how to escape from vehicles caught in flood waters.
Examples of situations which warrant the inclusion of flash flood emergency language in flash flood warnings may include but are not limited to:
- Declared states of emergency and confirmation of rapidly rising flood waters are placing or will place people in life-threatening situations.
- Water has rapidly risen or will rapidly rise to levels where people who are ordinarily in safe locations during previous flash flood events are now placed in life-threatening situations.
- Multiple swift water rescue teams have been or are being deployed in response to flash flooding of an exceptional magnitude.
- Stream gages, where available, indicate flood waters have risen rapidly to at least major levels or if gages are not available, flood waters have risen to levels rarely if ever seen.
- Total failure of a major high hazard dam that would have a catastrophic impact on the downstream communities.
Special Weather Statements (SPS) provide the public with information concerning ongoing or imminent weather hazards, which require a heightened level of awareness or action. Although typically used for hazards within 6 hours of product issuance, the SPS may also be used to heighten the awareness of a major event forecast to occur beyond 6 hours. The criteria are dependent on the situation for which the SPS is issued. Issuance criteria guidelines by weather hazard are as follows:
| Threat | Description |
|---|---|
| Developing Hazardous Convective Weather | WFOs may issue SPSs to heighten public awareness about ongoing or imminent hazardous convective weather expected to continue/dissipate, or expand/decrease in geographical coverage within the next hour or two. |
| Sub-Severe Thunderstorms | WFOs should issue an SPS for strong thunderstorms that approach, or are expected to approach, severe convective criteria. General criteria for a sub-severe thunderstorm is considered to be one or a combination of the following events: Sustained winds or gusts of 40 to 57 mph (lower values may be used at forecaster’s discretion) Hail less than 1 inch in diameter Frequent to continuous lightning Funnel clouds not expected to become a tornado threat |
| Other Short-Term Hazards | WFOs may issue SPSs for high-impact events to supplement information contained in other hazardous weather products, providing high-resolution details when possible. Examples include but are not limited to: “black ice” short-duration heavy snow bands lake-effect snow bands that briefly reduce visibility heavy rainfall that is not expected to cause flooding heat indices or wind chill near “advisory” level for an hour or two local areas of blowing dust where wind is below advisory criteria |
| Major Events Forecast to Occur Beyond 6 Hours | WFOs may issue SPSs to heighten awareness of major events forecast to occur beyond 6 hours. Priority should be given to ongoing or imminent events such as those listed above. |
Severe Weather Statements (SVSs) provide the public and emergency managers with updated information for specific Severe Thunderstorm and Tornado Warnings. Updated information includes reports of observed severe weather. They also inform the public and emergency managers when all or portions of a warning have been canceled or have expired.
The following guidelines apply to the issuance of SVSs by Weather Forecast Offices (WFOs):
- Cancellations – WFOs will issue a SVS to provide notice a SVR or TOR has been canceled for all or portions of the warned area
- Updates – WFOs will issue SVSs at least once during the valid time of a SVR or TOR
- Corrections – WFOs will issue a SVS to notify users of erroneous counties included in the original SVR or TOR have been removed
- Expirations – WFOs may issue a SVS to provide notice that a SVR or TOR has expired
The following Guidelines apply to the issuance of SVSs by WFOs:
- WFOs will issue SVSs to address the status of severe weather warnings
- WFOs will not use SVSs to expand in area or extend the valid time of TORs and SVRs
- If the threat of severe weather clears a significant portion of the SVR or TOR during the warning period, forecasters will update the warned area
SVSs will follow free-text format that shall include the following:
- Type of warning (i.e., damaging wind and/or hail)
- Expiration time of the warning
- Locations used to identify threatened areas (i.e., larger towns, familiar landmarks, states, counties, mileage markers)
- Basis for warning; forecast impacts including a tornado, hail sizes and/or wind gusts
- Storm motion, in some instances pathcasts (during instances of when a forecaster has high confidence in the movement of hazardous weather)
- Concise Call-to-Action statements (Precaution / Preparedness Actions)
SVSs will also, at times, include the following:
- The possibility of tornadoes if a Tornado Watch is in effect
- Recent credible reports of a tornado, severe hail, wind gusts, or damage due to a tornado, hail and/or wind
In exceedingly rare situations within a SVS, WFOs may use the terminology of “Tornado Emergency” and will use specific “Impacted Locations” such as cities, towns, and/or well-known landmarks. This can also include “Surrounding Areas”. Use of such terminology is appropriate for the tornadic situation if all of the following criteria are met:
- Severe threat to human life is imminent or ongoing
- Catastrophic damage is imminent or ongoing
- Reliable sources confirm the tornado either visually and/or radar imagery strongly suggests the existence of a damaging tornado (i.e., debris ball signature)
Inform the public of the possibility of flooding, typically within a 6 to 48 hour time frame before the event. Areal Flood Watches may cover states, counties, or rivers (i.e., reach); or portions of any of the above. Flood Watches for Forecast Points is optional product to inform the public of the possibility of flooding at specific forecast points on rivers and streams.
Flood watches will be issued when one or more of the following conditions are met:
- At least a 50% chance meteorological, soil, and/or hydrologic conditions will lead to flooding within a 48-hour period; or
- At least a 50% chance meteorological, soil, and/or hydrologic conditions will lead to flooding more than 48 hours into the future and the forecaster determines that a flood watch is the best way to convey this possibility; or
- At least a 50% chance meteorological, soil, hydrologic, and/or burn area conditions will lead to debris flows within a 48-hour period; or
- A dam or levee may fail and threaten lives or property, but the threat is not deemed to be imminent.
An optional general overview/synopsis section may be provided at the top of the product which will contain at least one of the following:
- General Overview Headline – One or more headlines summarizing the current flood situation, affected locations/areas including the list of rivers and forecast points impacted, and the expected duration (if known).
- General Synopsis – a brief, non-technical description of the flood situation and contributing hydrometeorological factors.
This is followed by the segmented follow-up information section for each of the forecast points which will include the following:
- Headline briefly summarizing the segment content.
- Action lead-in-phrase as to whether it is a flood or flash flood followed by the geographic area(s) covered.
- Event beginning and end times, when appropriate.
- Basis for the watch (e.g., synoptic conditions, soil conditions, river conditions, or quantitative precipitation forecasts).
- Potential impacts (e.g., areas under flood threat) with basin- and/or point-specific information.
- Statement defining the meaning of a watch.
- Call-to-action (CTA) focusing on avoiding flood dangers, and on forecast points covered, if necessary.
- Optional tabular hydrologic observations and/or point-specific forecasts may be provided at the bottom, if necessary.
Flood advisories for forecast points provide information on elevated river/stream flows as indexed by observations and/or forecasts at specific locations, when such events warrant notification of the public in a product less urgent than a warning. Flood advisories may be issued for forecast points in an HSA when:
- Elevated stream flow (excluding rivers and streams which are above flood stage or to exceed flood stage) warranting public notification occurs or is more than 80% likely to occur at one or more locations.
- One or more forecast points are already covered by an existing advisory, but an advisory needs to be issued for additional forecast points.
- Providing updated hydrometeorological information on a previously issued advisory.
An optional general overview/synopsis section may be provided at the top of the product which will contain at least one of the following:
- General Overview Headline – One or more headlines summarizing the current flood situation, affected locations/areas including the list of rivers and forecast points impacted, and the expected duration (if known).
- General Synopsis – a brief, non-technical description of the flood situation and contributing hydrometeorological factors.
This is followed by the segmented follow-up information section for each of the forecast points which will include the following:
- Headline summarizing the current situation (optional).
- The action lead-in phrase providing the immediate cause for the flood advisory followed by a list of iver/stream and/or forecast point names impacted.
- Event beginning and end times, when appropriate.
- Basis for warning and expected impacts.
- Call-to-action statements will focus on avoiding flood dangers and not include instructions on how to escape from vehicles caught in flood waters (for continuation segments).
An areal advisory provides information on elevated river/stream flow or ponding of water in a geographic area, when such an event warrants notification of the public in a product less urgent than a warning.
Five types of areal advisories are issued under the flood statement identifier:
- Urban and Small Stream Flood Advisories
- Arroyo and Small Stream Flood Advisories
- Small Stream Flood Advisoriess
- Flood Advisories
- Hydrologic Advisories
Areal advisories will be issued for a geographical area defined by a polygon in a WFO’s CWFA when:
- Elevated stream flow or ponding of water occurs or is more than 80% likely to occur which warrants public notification.
- An advisory needs to be issued for a geographical area currently not under a valid flood advisory.
- Updated hydrometeorological information needs to be provided on an existing advisory.
An optional general overview/synopsis section may be provided at the top of the product which will contain at least one of the following:
- General Overview Headline – One or more headlines summarizing the current flood situation, affected locations/areas impacted, and the expected duration (if known).
- General Synopsis – a brief, non-technical description of the flood situation and contributing hydrometeorological factors.
This is followed by the segmented follow-up information section for each of the forecast points which will include the following:
- Action lead-in phrase for the cause of the flooding followed by the geographic area of concern.
- Type of advisory (i.e., Urban and Small Stream)
- Event beginning and end times, when appropriate.
- Basis for the advisory and expected impacts.
- Call-to-action statements will focus on avoiding flood dangers and not include instructions on how to escape from vehicles caught in flood waters (for continuation segments).
Two types:
- Short-term (1 to 7 days) Hydrologic Outlooks can be issued to alert the public of the potential for flooding in the near-term such as when heavy rainfall is forecast that could result in flooding or aggravate an existing flood if it occurs.
- Long-term (weeks to months) Hydrologic Outlooks may also provide river or reservoir level and/or flow information. This information could be used for water supply concerns or projection of snowmelt flooding.
While no immediate threat, these products are issued to warn of inconvenient weather conditions, such as dense fog, wind chills, dangerous heat and freezes.
A Dense Fog Advisory is issued when widespread fog is expected to reduce visibilities to 1/4 mile or less over a large area for an extended period of time (2 or more hours).
A Freeze Warning is issued when significant, widespread freezing temperatures are expected.
A Freeze Warning is issued in the autumn until the end of the growing season (marked by the occurrence of first widespread freeze). The normal end of the growing season is mid to late October west of the Blue Ridge and early November east of the Blue Ridge. However, during anomalously warm autumns, the growing season may be extended past the normal end of the growing season.
A Freeze Warning is issued in the spring at the start of the growing season (when it is late enough to cause damage to new plants and crops).
A Freeze Watch is issued when there is a potential for significant, widespread freezing temperatures within the next 24-36 hours.
A Freeze Watch is issued in the autumn until the end of the growing season (marked by the occurrence of first widespread freeze). The normal end of the growing season is mid to late October west of the Blue Ridge and early November east of the Blue Ridge. However, during anomalously warm autumns, the growing season may be extended past the normal end of the growing season.
A Freeze Watch is issued in the spring at the start of the growing season (when it is late enough to cause damage to new plants and crops).
An Extreme Cold Warning is issued when extremely dangerous cold conditions or wind chill values are expected or occurring. If you are in an area with an Extreme Cold Warning, avoid going outside. If you have to go outside, dress in layers, cover exposed skin, and make sure at least one other person knows your whereabouts. Update them when you arrive safely at your destination.
A Cold Weather Advisory is issued for dangerously cold conditions that are not expected to reach warning criteria. Be sure you and your loved ones dress appropriately and cover exposed skin when venturing outdoors.
An Extreme Cold Watch is issued when extremely dangerous cold conditions or wind chill values are possible, but the occurrence, location, and/or timing is still uncertain.. As with a Warning, adjust your plans to avoid being outside during the coldest parts of the day. Make sure your car has at least half a tank of gas, and update your winter survival kit.
A “Heat Advisory” is issued when the heat index is forecast to reach between 105 and 109 degrees or air temperatures are forecast to reach between 100 and 104 degrees. An “Excessive Heat Warning” is issued when the heat index is forecast to reach 110 degrees or higher, or air temperatures are forecast to reach 105 degrees or higher.
An Extreme Heat Watch is issued when conditions are favorable for an extreme heat event but its occurrence and timing is still uncertain. Plan to suspend all major outdoor activities if a warning is issued. If you do not have air conditioning, locate the nearest cooling shelter or discuss staying with nearby family or friends who have air conditioning.
An Extreme Heat Warning is issued when extremely dangerous heat conditions are expected or occurring. Avoid outdoor activities, especially during the heat of the day. If you must be outside, be sure to drink plenty of water and take frequent breaks in the shade. Stay indoors in an air-conditioned space as much as possible, including overnight. Check on family and neighbors