133  
NOUS41 KNHC 241611  
PNSNHC  
 
PUBLIC INFORMATION STATEMENT  
NWS NATIONAL HURRICANE CENTER MIAMI FL  
1210 PM EDT MON APR 24 2017  
 
TO: SUBSCRIBERS:  
-NOAA WEATHER WIRE SERVICE  
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK  
-NOAAPORT  
OTHER NWS PARTNERS, USERS AND EMPLOYEES  
 
FROM: JAMES FRANKLIN  
BRANCH CHIEF, HURRICANE SPECIALIST UNIT  
NCEP/NATIONAL HURRICANE CENTER  
 
SUBJECT: SOLICITING PUBLIC COMMENTS THROUGH  
MAY 26, 2017 ON CHANGING THE  
RECONNAISSANCE VORTEX DATA MESSAGE FORMAT  
 
THE OFFICE OF THE FEDERAL COORDINATOR FOR METEOROLOGY WORKING GROUP  
FOR HURRICANE AND WINTER STORM OPERATIONS AND RESEARCH (WG/HWSOR),  
AT THE 2017 INTERDEPARTMENTAL HURRICANE CONFERENCE, HAS PROPOSED TO  
CHANGE THE RECONNAISSANCE VORTEX DATA MESSAGE FORMAT FOR THE 2018  
HURRICANE SEASON. THIS PRODUCT IS TRANSMITTED FROM NOAA AND AIR  
FORCE HURRICANE HUNTER AIRCRAFT AND ISSUED UNDER AWIPS HEADER  
MIAREPNT2 AND WMO HEADER URNT12 KNHC. THE FORMAT CHANGES BELOW WILL  
ENHANCE THE UTILITY OF THE VORTEX MESSAGE BY INCLUDING IMPORTANT  
PARAMETERS PREVIOUSLY NOT PROVIDED, OR PROVIDED ONLY OPTIONALLY IN  
THE COMMENT SECTION, AND BY IMPROVING THE ORGANIZATION OF THE  
MESSAGE. THE NWS IS SEEKING COMMENTS ON THESE PROPOSED CHANGES  
THROUGH MAY 26, 2017.  
 
THE PRIMARY CHANGES AND RATIONALES ARE LISTED BELOW, ALONG WITH  
EXAMPLES OF THE CURRENT AND PROPOSED MESSAGE FORMAT:  
 
1. THE CURRENT FORMAT (SEE EXAMPLE) HAS A FORMAL ENTRY ONLY FOR  
INBOUND WIND MAXIMA, WITH ANY OUTBOUND WIND MAXIMA APPEARING IN THE  
COMMENT SECTION. IN THE PROPOSED FORMAT, ITEMS L THROUGH O COMPRISE  
A NEW OUTBOUND WIND MAXIMA SECTION TO SIMPLIFY DATA DECODING AND TO  
ENSURE THAT NO DATA ARE MISSED. THE NEW OUTBOUND WIND MAXIMA  
SECTION APPEARS IN A SIMILAR FORMAT TO THE INBOUND MAXIMA DATA  
(ITEMS H THROUGH K).  
 
2. THE LATITUDE AND LONGITUDE WILL BE LISTED IN DECIMAL DEGREES  
INSTEAD OF DEGREES AND MINUTES TO BETTER ACCOMMODATE NHC AND OTHER  
USERS' NEEDS.  
 
3. THE PROPOSED MESSAGE INCLUDES A NEW TROPICAL CYCLONE CENTER DATA  
BLOCK SECTION (ITEMS C THROUGH G). THE SURFACE WIND REPORTED BY  
DROPSONDE AT THE SYSTEM'S CENTER IS NOW GIVEN IN ITEM E. CENTER/EYE  
SHAPE AND SIZE CHARACTERISTIC LINES ARE MOVED UP TO ITEMS F AND G  
FROM ITEMS L AND M.  
 
4. THE CURRENT MESSAGE LACKS MOST WIND OBSERVATION TIMES; THE  
PROPOSED FORMAT APPENDS THE OBSERVATION TIMES TO THE BEARING AND  
RANGE LOCATION ITEMS.  
 
5. TO BETTER COLLECT SIMILAR DATA TOGETHER, THE INBOUND MAXIMUM  
SURFACE AND FLIGHT-LEVEL WIND BLOCK (ITEMS E THROUGH G IN THE  
CURRENT FORMAT) IS SHIFTED DOWNWARD TO ITEMS H THROUGH K.  
 
NWS AND THE WG/HWSOR WILL EVALUATE ALL COMMENTS TO DETERMINE WHETHER  
TO PROCEED WITH THIS CHANGE.  
 
SEND COMMENTS ON THIS PROPOSAL TO:  
 
JESSICA SCHAUER  
NWS MARINE, TROPICAL AND TSUNAMI SERVICES BRANCH  
NATIONAL HURRICANE CENTER  
MIAMI, FL 33165  
JESSICA.SCHAUER@NOAA.GOV  
 
AND  
 
JAMES FRANKLIN  
HURRICANE SPECIALIST UNIT  
NATIONAL HURRICANE CENTER  
MIAMI, FL 33165  
JAMES.FRANKLIN@NOAA.GOV  
 
NATIONAL PUBLIC INFORMATION STATEMENTS ARE ONLINE AT:  
HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM  
 
CURRENT FORMAT EXAMPLE:  
 
URNT12 KNHC 241133  
VORTEX DATA MESSAGE AL162016  
A. 24/11:12:50Z  
B. 10 DEG 58 MIN N  
082 DEG 46 MIN W  
C. 700 MB 2927 M  
D. 90 KT  
E. 144 DEG 5 NM  
F. 253 DEG 78 KT  
G. 158 DEG 8 NM  
H. 977 MB  
I. 10 C / 3042 M  
J. 18 C / 3045 M  
K. NA / NA  
L. CLOSED  
M. C20  
N. 12345 / 7  
O. 0.02 / 1 NM  
P. AF301 0616A OTTO OB 13  
MAX OUTBOUND AND MAX FL WIND 108 KT 349 / 14 NM 11:17:00Z  
CNTR DROPSONDE SFC WIND 210 / 11 KT  
 
AN EXPLANATION OF THE CURRENT FORMAT CAN BE FOUND AT:  
HTTP://WWW.OFCM.GOV/PUBLICATIONS/NHOP/FCM-P12-2016CHANGE1.PDF  
(SEE FIGURE 5-3, PAGE 5-6).  
 
PROPOSED FORMAT EXAMPLE:  
 
URNT12 KNHC 241133  
VORTEX DATA MESSAGE AL162016  
A. 24/11:12:50Z  
B. 10.97 DEG N 082.77 DEG W  
C. 700 MB 2927 M  
D. 977 MB  
E. 210 DEG 11 KT  
F. CLOSED  
G. C20  
H. 90 KT  
I. 144 DEG 5 NM 11:07:00Z  
J. 253 DEG 78 KT  
K. 158 DEG 8 NM 11:07:30Z  
L. 95 KT  
M. 314 DEG 5 NM 11:17:00Z  
N. 033 DEG 108 KT  
O. 349 DEG 14 NM 11:17:30Z  
P. 10 C / 3042 M  
Q. 18 C / 3045 M  
R. NA / NA  
S. 12345 / 7  
T. 0.02 / 1 NM  
U. AF301 0616A OTTO OB 13  
MAX FL WIND 108 KT 349 / 14 NM 11:17:00Z  
 
THE INDIVIDUAL ITEMS IN THE PROPOSED FORMAT ARE DEFINED AS FOLLOWS:  
 
A. DATE AND TIME OF FIX  
B. LATITUDE AND LONGITUDE OF VORTEX CENTER FIX  
C. MINIMUM HEIGHT AT STANDARD ATMOSPHERIC LEVEL  
D. MINIMUM SEA-LEVEL PRESSURE FROM DROPSONDE OR EXTRAPOLATION  
E. DROPSONDE CENTER WIND SPEED AND DIRECTION  
F. EYE CHARACTER  
G. EYE SHAPE/ORIENTATION/DIAMETER  
H. ESTIMATE OF MAXIMUM INBOUND SURFACE WIND OBSERVED  
I. BEARING, RANGE AND TIME OF WIND OBSERVED IN ITEM H  
J. MAXIMUM INBOUND FLIGHT-LEVEL WIND  
K. BEARING, RANGE AND TIME OF WIND OBSERVED IN ITEM J  
L. ESTIMATE OF MAXIMUM OUTBOUND SURFACE WIND OBSERVED  
M. BEARING, RANGE AND TIME OF WIND OBSERVED IN ITEM L  
N. MAXIMUM OUTBOUND FLIGHT-LEVEL WIND  
O. BEARING, RANGE AND TIME OF WIND OBSERVED IN ITEM N  
P. MAXIMUM FLIGHT-LEVEL TEMP/PRESSURE ALTITUDE OUTSIDE EYE  
Q. MAXIMUM FLIGHT-LEVEL TEMP/PRESSURE ALTITUDE INSIDE EYE  
R. DEW POINT TEMPERATURE/SEA SURFACE TEMPERATURE INSIDE EYE  
S. FIX DETERMINED BY (CODES FOR OBSERVATION TYPE)  
T. NAVIGATION FIX ACCURACY/METEOROLOGICAL ACCURACY  
U. AIRCRAFT ID, MISSION NUMBER, CYCLONE NAME, AND OBSERVATION NUMBER  
END REMARKS INCLUDE MAXIMUM FLIGHT-LEVEL WIND, BEARING, RANGE AND  
TIME DURING MISSION  
 
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