What does a 292259Z Mean?

[Cassidy Bridges]

listed here: http://www.ntsb.gov/aviationquery/brief2...MS2&akey=1

and here:
VALID 292259Z - 300100Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 73
CONTINUES.

CONVECTIVE COVERAGE FCST TO INCREASE NEXT FEW HOURS ALONG/AHEAD OF
SFC COLD FRONT OVER THIS REGION AS FRONT IMPINGES ON HIGHER-THETAE
WARM SECTOR OVER S TX...LARGE HAIL AND OCNL DAMAGING GUSTS EXPECTED.


LAST SFC MESOANALYSIS SHOWED COLD FRONT FROM NEAR GTU WSWWD ACROSS
EDWARDS/VAL VERDE COUNTIES...AND CROSSING RIO GRANDE S OF
6R6...MOVING SSEWD AT ABOUT 15 KT. S OF FRONT...CONVECTION
CONTINUES TO FORM OVER SERRANIAS DEL BURRO RANGE IN COAHUILA...BUT
GENERALLY HAS BEEN WEAKENING AFTER MOVING E OF MOUNTAINS AND AWAY
FROM OROGRAPHIC FORCING SOURCE. STILL...CINH MAY BE WEAK ENOUGH TO
ALLOW ONE OR TWO SUCH TSTMS TO ACQUIRE SUSTAINED ROTATION AND REACH
RIO GRANDE AFTER 00Z...ESPECIALLY ANY LEFT-MOVERS OR BOWS THAT MAY
FORM. DEEP-LAYER VERTICAL WIND PROFILES REMAIN FAVORABLE WITH 40-50
KT EFFECTIVE SHEAR. PRONOUNCED COUNTERCLOCKWISE CURVATURE IN
PREFRONTAL/LOW-LEVEL HODOGRAPHS...BOTH AS OBSERVED IN DFX VWP AND AS
PREDICTED REASONABLY WELL BY RUC FCST SOUNDINGS...YIELDS FAR MORE
NEGATIVE THAN POSITIVE SRH FOR ALL BUT EXTREMELY DEVIANT/FAST
RIGHT-MOVERS...WHICH ARE UNLIKELY EXCEPT WHERE OUTFLOW-DOMINANT.

ADDITIONAL TSTMS DEVELOPING N OR NE OF MEX MOUNTAINS MAY BE UNDERCUT
BY ZONAL SEGMENT OF COLD FRONT SOON THEREAFTER...AS HAS ISOLATED
CELL OVER VAL VERDE COUNTY. CONVECTION APPEARS TO BE DEEPENING
FARTHER ENE ALONG MORE SW-NE ALIGNED FRONTAL SEGMENT FROM
EDWARDS-LLANO COUNTIES AS OF 2230Z. THIS ACTIVITY MAY HAVE ACCESS
TO WARM-SECTOR AIR MASS FOR MORE SUSTAINED PERIOD...ESPECIALLY ANY
TSTMS THAT CAN AVOID ACQUIRING LEFT-MOVING SUPERCELLULAR
CHARACTERISTICS AND MOVE EWD/SEWD AT LEAST IN STEP WITH BOUNDARY
TRANSLATION. MOST STORM MOTIONS NEAR FRONT SHOULD BE CLOSE TO
HODOGRAPH...WITH FRONTAL FORCING EVENTUALLY CONTRIBUTING TO DOMINANT
QUASI-LINEAR CONVECTIVE MODE.

..EDWARDS.. 03/29/2011


ATTN...WFO...HGX...CRP...EWX...BRO...
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srainhoutx
Site Admin


Posts: 8962
Joined: Tue Feb 02, 2010 3:32 pm
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[Vamp]

It is actually a date and time

The first 2 digits are the date and the last four, the time. The "Z" indicates that the time is given in "Zulu" time (ie UTC - Universal Coordinated Time) rather than "local" time.

In this case the report is valid from 22.59 UTC on the 29th to 1am UTC on the 30th