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Sunday April 10th severe outbreak


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MESOSCALE DISCUSSION 0399

NWS STORM PREDICTION CENTER NORMAN OK

0602 PM CDT SUN APR 10 2011

AREAS AFFECTED...WI AND THE UPPER PENINSULA OF MICHIGAN

CONCERNING...TORNADO WATCH 120...

VALID 102302Z - 110030Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 120 CONTINUES.

THE REMAINDER OF THE WESTERN AND CENTRAL UPPER PENINSULA OF MICHIGAN

MAY NEED TO BE ADDED TO WW 120 WITHIN THE NEXT HOUR OR TWO.

SCATTERED VIGOROUS STORMS ARE ONGOING...FROM NEAR THE DEEP SURFACE

CYCLONE CENTER MIGRATING ACROSS NORTHWEST WISCONSIN...SOUTHWARD TO

THE VICINITY OF A 90 KT SOUTHWESTERLY 500 MB JET AXIS ACROSS

SOUTHWEST WISCONSIN. AN EMBEDDED SPEED MAXIMUM IS IN THE PROCESS OF

NOSING ACROSS THE UPPER MISSISSIPPI VALLEY TOWARD THE UPPER GREAT

LAKES REGION...WITH A REGION OF ENHANCED UPPER DIVERGENCE

CONTRIBUTING TO CONVECTIVE DEVELOPMENT. THIS ACTIVITY APPEARS

LIKELY TO GENERALLY MAINTAIN ITS DISCRETE NATURE AT LEAST ANOTHER

COUPLE OF HOURS AS UPPER FORCING SPREADS ACROSS NORTHEASTERN

WISCONSIN AND THE WESTERN UPPER PENINSULA OF MICHIGAN THROUGH

01-02Z. IN THE PRESENCE OF MODERATELY STRONG MIXED LAYER CAPE

/1000-1500 J PER KG/ AND STRONG DEEP LAYER SHEAR...AS WELL AS

PERHAPS ENLARGING LOW-LEVEL HODOGRAPHS...TORNADIC POTENTIAL COULD

STILL INCREASE EARLY THIS EVENING. LARGE HAIL WILL CONTINUE

POSSIBLE...ALONG WITH LOCALLY DAMAGING WIND GUSTS.

..KERR.. 04/10/2011

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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 122

NWS STORM PREDICTION CENTER NORMAN OK

610 PM CDT SUN APR 10 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF

FAR EASTERN IOWA

WESTERN...CENTRAL AND NORTHERN ILLINOIS

EASTERN MISSOURI

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 610 PM UNTIL

100 AM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.

DISCUSSION...TSTMS EXPECTED TO INCREASE IN NUMBER AND STRENGTH

THROUGH LATE EVE ALONG MERGING DRY LINE...PRE-FRONTAL CONFLUENCE

ZONE...AND COLD FRONT FROM FAR ERN IA SWD INTO ERN MO. OTHER STORMS

MAY FORM FARTHER E ALONG SSW-NNE BAND OF CONFLUENCE NOTED OVER CNTRL

IL. WHILE LARGE SCALE ASCENT ATTM APPEARS TO BE DOWNWARD IN WAKE OF

PASSING UPR IMPULSE NOW ENTERING WI...LARGE SCALE ASCENT MAY

OVERSPREAD LATER THIS EVE AS JET ENTRANCE REGION EVOLVES AHEAD OF

PROGRESSIVE LARGER SCALE UPR TROUGH. WITH SFC HEATING/LOW-LVL

CONVERGENCE ALREADY HAVING INITIATED CONVECTION/STORMS IN ERN IA/NE

MO...AND WITH THE EXPECTATION FOR INCREASING LARGE SCALE UVV LATER

THIS EVE...A POTENTIAL WILL EXIST FOR SUSTAINED STORMS.

LONG...SLIGHTLY-HOOKED HODOGRAPHS SUGGEST POSSIBILITY FOR

SUPERCELLS/LEWPS WITH TORNADOES...IN ADDITION TO SVR WIND AND HAIL.

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this may be the storm to watch heading for a highly populated area the next 1-2 hours ...backed SE winds near green bay metro

may be truning right heading for south subrbs of green bay

ans appleton area

BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE LA CROSSE WI

616 PM CDT SUN APR 10 2011

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* TORNADO WARNING FOR...

CENTRAL ADAMS COUNTY IN CENTRAL WISCONSIN...

CENTRAL JUNEAU COUNTY IN CENTRAL WISCONSIN...

* UNTIL 700 PM CDT

* AT 614 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A

TORNADO NEAR KELLY...OR 11 MILES NORTH OF MAUSTON...MOVING EAST AT

35 MPH. THIS TORNADO WARNING UPGRADES THE PREVIOUS SEVERE

THUNDERSTORM WARNING FOR ADAMS AND JUNEAU COUNTIES.

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SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE LA CROSSE WI

624 PM CDT SUN APR 10 2011

WIC001-057-110000-

/O.CON.KARX.TO.W.0007.000000T0000Z-110411T0000Z/

ADAMS WI-JUNEAU WI-

624 PM CDT SUN APR 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL JUNEAU AND CENTRAL

ADAMS COUNTIES UNTIL 700 PM CDT...

LOCAL LAW ENFORCEMENT OFFICIALS REPORTED A FUNNEL CLOUD SOUTH OF

NECEDAH.

AT 618 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE

SEVERE THUNDERSTORM WAS LOCATED NEAR HIGHWAYS 80 AND 58...OR 11 MILES

WEST OF FRIENDSHIP...MOVING EAST AT 75 MPH. IN ADDITION TO A

TORNADO...THIS STORM CAN PRODUCE QUARTER SIZE HAIL AND DESTRUCTIVE

WINDS IN EXCESS OF 70 MPH.

* THE TORNADO WILL BE NEAR...

THE SHIP ROCK WAYSIDE AND THE PRESTON CLIFFS AROUND 630 PM...

THE COLBURN WILDLIFE AREA AND COUNTY ROADS C AND G AROUND 635 PM...

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SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE LA CROSSE WI

631 PM CDT SUN APR 10 2011

WIC001-057-110000-

/O.CON.KARX.TO.W.0007.000000T0000Z-110411T0000Z/

ADAMS WI-JUNEAU WI-

631 PM CDT SUN APR 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL JUNEAU AND CENTRAL

ADAMS COUNTIES UNTIL 700 PM CDT...

TRAINED WEATHER SPOTTERS REPORTED A TORNADO NEAR COTTONVILLE.

AT 627 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE

TORNADO WAS LOCATED NEAR ROCHE A CRI STATE PARK...OR NEAR

FRIENDSHIP...MOVING EAST AT 75 MPH. IN ADDITION TO A TORNADO...THIS

STORM CAN PRODUCE QUARTER SIZE HAIL AND DESTRUCTIVE WINDS IN EXCESS

OF 70 MPH.

* THE TORNADO WILL BE NEAR...

COUNTY ROADS C AND G AND COUNTY ROADS G AND O AROUND 635 PM...

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SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE GREEN BAY WI

634 PM CDT SUN APR 10 2011

WIC067-069-073-115-110000-

/O.CON.KGRB.TO.W.0002.000000T0000Z-110411T0000Z/

LINCOLN WI-LANGLADE WI-MARATHON WI-SHAWANO WI-

634 PM CDT SUN APR 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR WESTERN SHAWANO...NORTHERN

MARATHON...SOUTHWESTERN LANGLADE AND SOUTHERN LINCOLN COUNTIES UNTIL

700 PM CDT...

AT 627 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO JUST

SOUTH OF MERRILL...OR 14 MILES NORTH OF WAUSAU. DOPPLER RADAR

SHOWED THIS TORNADO MOVING EAST AT 70 MPH. ANOTHER SEVERE STORM

WAS LOCATED JUST SOUTHEAST OF MEDFORD

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down south

NWS STORM PREDICTION CENTER NORMAN OK

0617 PM CDT SUN APR 10 2011

AREAS AFFECTED...CNTRL TX NEWD TO ERN OK/WRN AR

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 102317Z - 110015Z

A RELATIVELY LARGE AREA FROM NEAR SAN ANGELO TX NEWD INTO TULSA OK

IS BEING MONITORED FOR CONVECTIVE INITIATION AND A POTENTIAL WW.

LATEST DETERMINISTIC/HI-RES MODELS SUGGEST ISOLATED STORMS

DEVELOPING AROUND 00Z...WITH MORE WIDESPREAD COVERAGE POSSIBLE

THEREAFTER.

THE PRESENCE OF AN EML HAS WIDELY LIMITED CONVECTIVE DEVELOPMENT

ACROSS THE SRN PLAINS THROUGH THE AFTERNOON. HOWEVER...THE APPROACH

OF AN UPPER TROUGH AND ASSOCIATED COOLING ALOFT IN COMBINATION WITH

ADEQUATE HEATING/MOISTENING OF LOW LEVELS HAS GRADUALLY BEEN ERODING

CONVECTIVE INHIBITION...EVIDENCED BY AN EXPANSIVE CU FIELD THAT IS

BEGINNING TO DEVELOP ALONG AN APPARENT WEAK COLD FRONT/DRYLINE. LOW

LEVEL FORCING ALONG THIS FEATURE SHOULD BE SUFFICIENT FOR AT LEAST

ISOLATED STORMS TO DEVELOP OVER THE NEXT FEW HOURS. STEEPER

MID-LEVEL LAPSE RATES NEAR 8 C/KM AND SUFFICIENT CLOUD BEARING SHEAR

SHOULD SUPPORT OCCASIONAL ROTATION AND LARGE HAIL FORMATION IN

STORMS THAT CAN SUSTAIN A STRONGER UPDRAFT...WITH A RISK FOR DMGG

WINDS AND PERHAPS AN ISOLATED TORNADO SHOULD MORE SURFACE-BASED

CONVECTION BECOME APPARENT. RELATIVELY WEAK LOW LEVEL FLOW IN

COMPARISON TO AREAS FARTHER N AND LARGE T/TD SPREADS MAY LIMIT A

MORE WIDESPREAD TORNADO THREAT. COVERAGE OF STORMS IS EXPECTED TO

INCREASE AFTER DARK IN ASSOCIATION WITH A STRENGTHENING LOW LEVEL

JET...WITH SHEAR VECTORS PARALLEL TO THE DRYLINE/WEAK COLD FRONTAL

SURGE LEADING

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Cell N of Galesburg, IL has been maintaining itself pretty nicely. It's small now due to relatively low CAPE but will have an opportunity to grow and intensity as it heads NE into better instability and low-level shear. This cell or others from this cluster could affect the Chicago area if they intensity much further, taking a more right-hand turn.

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