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Service Change Notice 17-112 Updated

National Weather Service Headquarters Silver Spring MD

420 PM EST Fri Jan 19 2018

 

To:      Subscribers:

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network

         -NOAAPort

         Other NWS Partners and NWS Employees

 

From:    Michelle Hawkins, Chief

         Severe, Fire, Public, and Winter Weather

           Services Branch

 

Subject: Updated: Polygon-based Snow Squall Warnings to begin on or

         about January 31, 2018, for select offices and Polygon-based

         Dust Storm Warnings and Dust Advisory Product Operational

         Demonstration at select Weather Forecast offices (WFOs) on

         or about June 20, 2018

 

Updated to amend the beginning date for the Snow Squall Warning

Operational Demonstration to on or about January 31, 2018, for

WFO Cheyenne, WY and to a date to be announced in a future

Service Change Notice for WFO Buffalo. Also updated to amend the

beginning date for the Dust Storm Warnings and Dust Advisory

locations to on or about June 20, 2018.

 

To provide feedback on Dust Storm Warning and Dust Advisory:

www.nws.noaa.gov/survey/nws-survey.php?code=DSWDSY

 

To provide feedback on Snow Squall Warnings:

www.nws.noaa.gov/survey/nws-survey.php?code=SQW1718

 

On January 16, 2018, the NWS began an operational demonstration

to issue the highly localized, polygon-based Snow Squall

Warnings at the following WFOs:

 

State College, PA

Binghamton, NY

Burlington, VT

Pittsburgh, PA

Detroit, MI

 

and effective on or about June 20, 2018, the polygon-based Dust

Storm Warnings and Dust Advisory products at WFOs:

 

Phoenix, AZ

Tucson, AZ

 

The software that provides the capability to issue these

products will be implemented in a phased manner to all NWS

offices by May 2018. Provision of the new products will commence

according to local office procedures. A Service Change Notice

will be issued before the operational implementation of the

new services.

 

The products will be issued for a portion of a county or

counties within the warned area, as defined and depicted by the

polygon LAT/LON point pairs. Portions of counties would be

described by ordinal directions (e.g., North, Northeast, East,

Southwest, Central, etc.). After an initial issuance, WFOs would

update the product for an extension of area or time by issuing a

new product. The WFO issuing the initial message would cancel or

allow it to expire when conditions no longer meet criteria.

 

Snow Squall Warning Product:

 

The Snow Squall Warning will provide three discrete

information sections segments per the example below when the

following conditions are expected:

 

HAZARD...White-out conditions in heavy snow and blowing snow

SOURCE...Radar indicated and webcams

IMPACT...Dangerous life-threatening travel

 

The Snow Squall Warning will use the new SQ.W Valid Time Event

Code (VTEC) with an operational (O) fixed identifier in the

P-VTEC line, and Warning (W) significance code.

 

The new product will use existing World Meteorological

Organization (WMO) headers and Advanced Weather Interactive

Processing System (AWIPS) identifiers as shown below:

 

WFO                    WMO Header        AWIPS Id

--------------------   ---------         --------

State College, PA      WWUS51 KCTP       SQWCTP

Binghamton, NY         WWUS51 KBGM       SQWBGM

Burlington, VT         WWUS51 KBTV       SQWBTV

Pittsburgh, PA         WWUS51 KPBZ       SQWPBZ

Detroit, MI            WWUS53 KDTX       SQWDTX

Cheyenne, WY           WWUS55 KCYS       SQWCYS

 

The Snow Squall Warning product will be available via NOAA

Weather Wire Services, NOAAPort satellite broadcast and other

sources under the WMO Header WWaa5i cccc:

 

-aa corresponds to US, AK, CA, GM, HW, or ZS

-i is equal to 0 (zero) to 9

-cccc is equal to the WFO 4-character site ID

 

The Snow Squall Warning product will use the county Universal

Geographic Code (UGC).

 

The Snow Squall Warning will appear on the weather.gov web page

as well as the local WFO web pages with a priority of number 23

and display color of medium violet red.

 

Snow Squall Warnings will broadcast over NOAA Weather Radio All

Hazards (NWR) using the NWR Specific Area Message Encoding

(SAME) SVS Event Code according to local policy. The 1050 Hz

Warning Alarm Tone will also be invoked. NWS Offices will be

working with state broadcasters associations and State Emergency

Communications Committees for possible future activations of the

Emergency Alert System (EAS) for the Snow Squall Warning.

 

Dust Storm Warning Products:

 

The existing zone-based Dust Storm Warning will be replaced by

two distinct warning products: a polygon-based Dust Storm

Warning and a zone-based Blowing Dust Warning. The polygon-based

Dust Storm Warning will be issued when widespread or localized

blowing dust is forecast to suddenly reduce visibility to less

than one quarter mile with sustained winds greater than 25 mph,

resulting in dangerous and life-threatening travel conditions.

The polygon-based Dust Storm Warning will provide three discrete

information sections segments per the example below when the

following conditions are expected:

 

HAZARD...Visibility less than one-quarter mile in blowing dust

SOURCE...Radar indicated and webcams

IMPACT...Dangerous and life-threatening travel

 

The zone-based Blowing Dust Warning will be issued if similar

conditions are forecast over a long duration, generally greater

than 90 minutes.

 

Dust Advisory Products:

 

The new polygon-based Dust Advisory will be issued when

widespread or localized blowing dust suddenly reduces visibility

to between one quarter of a mile and 1 mile, resulting in

hazardous travel conditions. The polygon-based Dust Advisory

will provide three discrete information sections, per the

example below, when the following conditions are expected:

 

HAZARD...Visibility between one-quarter and 1 mile in blowing

dust

SOURCE...Radar indicated and webcams

IMPACT...Hazardous travel

 

The existing Blowing Dust Advisory will remain a zone-based

product and will be issued if similar conditions persist over a

long duration, generally greater than 3 hours.

 

All Dust Warning and Advisory products will be available via

NOAA Weather Wire Service (NWWS), NOAAPort satellite broadcast

and other sources under the WMO Header WWaa7i cccc

 

-aa corresponds to US, AK, CA, GM, HW, or ZS

-i is equal to 0 (zero) to 9

-cccc is equal to the WFO 4-character site ID

 

The polygon-based (with county UGC) Dust Storm Warning and Dust

Advisory will have an AWIPS Identifier of DSWxxx where xxx is

equal to WFO site ID.

 

The zone-based (with zone UGC) Blowing Dust Warning and Blowing

Dust Advisory will have an AWIPS Identifer of NPWxxx, where xxx

is equal to 3-character WFO site ID.

 

The Dust Storm Warning will use the existing VTEC code DS.W and

the Dust Advisory will use the new DS.Y VTEC code. Both of the

warning products will use existing WMO headings (WWUS55 KPSR for

WFO Phoenix and WWUS55 KTWC for WFO Tucson) and AWIPS

Identifiers (DSWPSR for WFO Phoenix and DSWTWC for WFO Tucson)

for dissemination over NOAAPort and NOAA Weather Wire Services.

NWS will broadcast the polygon-based Dust Storm Warning over NWR

and disseminate with both SAME (using the DSW Event Code) and

1050 Hz warning alarm tones. NWS will display the warning

polygon on NWS radar depictions.

 

The Dust Storm Warning and the Blowing Dust Warning will appear

on the weather.gov web page as well as the local WFO web pages

with a priority of number (40) and display color of bisque. The

Dust Advisory and the Blowing Dust Advisory will appear on the

weather.gov web page as well as the local WFO web pages with a

priority of number (87) and display color of dark khaki.

 

Common Alerting Protocol:

 

The Snow Squall Warning and Dust Storm Warning products will be

disseminated in Common Alerting Protocol (CAP) format through

several methods. CAP is pre-parsed and is intended for use by

the weather enterprise and other partners. For more information

on CAP and how to obtain it via NOAAPORT, NWS web file services,

in raw XML format or via a web service API, please see the

following Service Change Notice issued on September 1, 2017:

http://www.nws.noaa.gov/os/notification/scn17-98cap1_2.htm

 

Examples of these products including more information about

activation of the Emergency Alert System and Wireless Emergency

Alerts can be found in the Product Description Documents linked

below:

 

Dust Storm Warning/Dust Advisory:

https://nws.weather.gov/products/docs/PDD-DustStormWarningandAdvisoryProducts.pdf

 

Snow Squall Warning:

https://nws.weather.gov/products/docs/PDD-NewSnowSqualWarning.pdf

 

Additional information on UGC and VTEC can be found in NWS

Instructions (NWSI) 10-1701 and NWSI 10-1703, respectively at:

http://www.nws.noaa.gov/directives/sym/pd01017001curr.pdf

http://www.nws.noaa.gov/directives/sym/pd01017003curr.pdf

 

To provide feedback on Dust Storm Warning and Dust Advisory:

www.nws.noaa.gov/survey/nws-survey.php?code=DSWDSY

 

To provide feedback on Snow Squall Warnings:

www.nws.noaa.gov/survey/nws-survey.php?code=SQW1718

 

For questions or comments on these new products, please contact:

 

For Snow Squall Warning:

David Soroka, Winter Weather Services Program Lead

NWS Severe, Fire, Public, and Winter Weather Services Branch

Silver Spring, MD

Telephone: 301-427-9346

Email: david.soroka@noaa.gov

 

For Dust Storm Warning and Dust Advisory:

Andy Horvitz, Public Weather Services Program Lead

NWS Severe, Fire, Public, and Winter Weather Services Branch

Silver Spring, MD

Telephone: 301-427-9357

Email: andy.horvitz@noaa.gov

 

National Service Change Notices are online at:

 

http://www.weather.gov/os/notif.htm

 

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