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Mesoscale Discussion 1490 |
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MESOSCALE DISCUSSION 1490
NWS STORM PREDICTION CENTER NORMAN OK
0747 PM CDT SUN JUL 19 2015
AREAS AFFECTED...CENTRAL/SOUTHEASTERN MISSOURI AND FAR SOUTHWESTERN
ILLINOIS
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 200047Z - 200245Z
PROBABILITY OF WATCH ISSUANCE...40 PERCENT
SUMMARY...SCATTERED THUNDERSTORM ACTIVITY HAS RECENTLY DEVELOPED IN
CENTRAL MISSOURI NEAR VIH. CONVECTIVE TRENDS ARE BEING MONITORED
FOR ANY CONTINUED INCREASE IN COVERAGE WHICH MAY NECESSITATE A WW
ISSUANCE.
DISCUSSION...CONVECTION HAS RAPIDLY DEVELOPED NEAR VIH ALONG A
STALLED E-W SURFACE FRONT ACROSS CENTRAL MISSOURI. THE AIRMASS JUST
SOUTH OF THE BOUNDARY IS STRONGLY UNSTABLE...WITH 3500-4000 J/KG
MLCAPE...MODEST NWLY MID-LEVEL FLOW...AND WEAKLY VEERING WIND FIELDS
WITH HEIGHT SUPPORTIVE OF THE POTENTIAL FOR SOME UPDRAFT ROTATION
AND LARGE HAIL/DAMAGING WINDS WITH SUSTAINED STORMS. OBSERVATIONS
AND MODEL GUIDANCE ARE CONSISTENT WITH DEVELOPING THIS ACTIVITY
SOUTHEASTWARD WITH TIME TOWARD THE CONFLUENCE OF THE MISSISSIPPI AND
OHIO RIVERS...AND A CONTINUED SEVERE THREAT COULD EXIST WITH THIS
ACTIVITY GIVEN THE MAGNITUDE OF INSTABILITY AND SHEAR IN THE REGION.
CONVECTIVE TRENDS WILL BE MONITORED FOR A POSSIBLE INCREASE IN
COVERAGE...WHICH MAY NECESSITATE A WW ISSUANCE.
..COOK/MEAD.. 07/20/2015
ATTN...WFO...PAH...LSX...SGF...
LAT...LON 38059217 38459190 38529136 38499070 38379007 38188931
37618886 36968895 36708924 36618991 37079131 37519203
38059217
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