Special Weather Statement, NWS Twin Cities, MN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
442 AM CDT THU JUN 14 2012

.DISCUSSION...

OVERVIEW...SEVERAL BOUTS OF RAIN LIKELY OVER THE COMING DAYS WITH
ABOVE NORMAL TEMPERATURES. MORE HUMIDITY ARRIVES TODAY AND LINGERS
INTO EARLY NEXT WEEK.

THE GRAND FORKS AND ABERDEEN NWS OFFICES HAVE BEEN DOING BATTLE
WITH ELEVATED THUNDERSTORMS AND POTENTIALLY LARGE HAIL THIS
MORNING. THESE STORMS ARE NOW ON THE FRINGE OF THE WESTERN BORDER
OF OUR FORECAST AREA. THE LEADING AREA OF STORMS ARE ON THE NOSE
OF A VERY STRONG 850MB JET AND IN THE AREA OF WARM AIR ADVECTION.
SO FAR...THERE HAS NOT BEEN MUCH SOUTHWARD DEVELOPMENT. IN
FACT...THERE IS DEVELOPMENT BACK TO THE NORTHWEST WITH TIGHTENING
850MB-700MB ISOTHERMS. THE 700MB FRONTOGENESIS IS LIKELY THE
RESULT OF THE APPROACHING TROUGH ENTERING THE NORTHERN PLAINS.
THE MOISTURE IS ALSO MUCH BETTER BACK TOWARD CENTRAL ND/SD.
NONETHELESS...INCLUDED HIGH POPS IN CENTRAL MN TO ACCOUNT FOR THE
EASTWARD MOVEMENT WITH TIME ALTHOUGH WOULDNT BE SURPRISED TO SEE A
WEAKENING TREND. INCLUDED AT LEAST CHANCE POPS MUCH FURTHER SOUTH
TO ACCOUNT FOR DEVELOPMENT WHERE THE GOOD MOISTURE TRANSPORT IS
POINTING AND PWATS ARE ON THE RISE. ACTUALLY ITS 09Z AND JUST NOW
SEEING SOME LIGHT ELEVATED ECHOES OVER THE METRO.

REGARDLESS OF WHAT HAPPENS THIS MORNING...WIDESPREAD SHOWERS AND
THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS WESTERN MN THIS
AFTERNOON OUT AHEAD OF THE COLD FRONT. WARM FRONT SHOULD MAKE
RAPID PROGRESS TO THE NORTH TODAY AND WILL LIKELY EXTENDED FROM
NORTH CENTRAL MN INTO WEST CENTRAL BY 21Z THIS AFTERNOON. THE NEW
SPC DAY1 HAS A 10% TORNADO PROBABILITY IN EAST CENTRAL MN AND
WEST CENTRAL WI. CAN'T REALLY ARGUE WITH THIS GIVEN THE 0-1KM SRH
AND BULK SHEAR OFF THE NAM AND RAP...RIGHT AROUND 100-200 M2/S2
AND 20KTS RESPECTIVELY AROUND 21Z THIS AFTERNOON IN EASTERN MN.
THE MOST FAVORABLE LOW LEVEL WIND FIELD LIFTS NORTH LATE THIS
MORNING TOWARDS DULUTH. FURTHERMORE...THE TOP 15 DATES FROM THE CIPS
WARM SEASON ANALOG OFF THE 00Z NAM FROM LAST NIGHT DOES
CONCENTRATE THE TORNADO REPORTS IN EAST CENTRAL MN...WITH THE WIND
AND HAIL COVERING A MUCH LARGER AREA. MAX UPDRAFT HELICITY FROM
OUR LOCAL WRF-ARW...AND TO SOME DEGREE NCEP WRF ARW/NMM...HAVE A
COUPLE CLUSTERS OF +50 M2S2 BY 15.00Z ALONG A LINE FROM DULUTH TO
ALBERT LEA WITH SLIGHTLY BACKED WINDS NEAR THE WARM FRONT NORTH
OF THE TWIN CITIES METRO. IN TERMS OF TIMING...21Z IN
CENTRAL MN...00-01Z IN EASTERN MN...AND 04Z CLEARING WEST CENTRAL
WI IS A GOOD FIRST GUESS BASED ON SHORT-TERM MODEL CONSENSUS.

MODEL GUIDANCE HAS BEEN CONSISTENT IN DEPICTING A SHORT WAVE
TROUGH OVER THE NORTHERN PLAINS AT 12Z SATURDAY...ITS EVOLUTION IS
STILL SOMEWHAT UNCERTAIN IN BOTH TIMING AND HOW MUCH IT DEEPENS.
THE RESULTANT SFC CYCLONE AND COLD FRONT ARE THEREFORE
AFFECTED...SO DIFFICULT TO GET A HANDLE ON THE INTENSITY AND
TIMING OF CONVECTION ON SATURDAY...ALTHOUGH THINK THERE WILL BE
GOOD STORM COVERAGE. OVERNIGHT CONVECTION AND OUTFLOW BOUNDARIES
FURTHER COMPLICATE THE INSTABILITY PARAMETERS AND SEVERE POTENTIAL
ON SATURDAY.

STILL TRACKING THAT VORT MAX THAT ARRIVES FRIDAY NIGHT/SATURDAY AS
MAIN TROUGH LIFTS NORTH INTO ONTARIO. SHORTWAVE ORIGINATING OUT OF
CO TONIGHT AND TRACKING NE ACROSS THE CENTRAL PLAINS AND ENDING UP
IN SOUTHERN MN BY SATURDAY MORNING. IT ORIGINATES OUT OF  CONVECTION
IN THE SOUTHWEST WITH GOOD DIFFLUENCE OUT AHEAD OF THE LONG WAVE
TROUGH IN THE SOUTHWEST - SO LIKELY CONVECTIVE INDUCED.

IN THE EXTENDED...LONG WAVE TROUGHING BECOMING ESTABLISHED DEEPENING
AS IT PROGRESSES ACROSS THE NORTHERN PLAINS WITH TIME. STRONG TO
SEVERE THUNDERSTORMS ARE POSSIBLE BETWEEN THE NORTHERN PLAINS AND
UPPER MISSISSIPPI VALLEY EARLY NEXT WEEK AS DYNAMICS ASSOCIATED WITH
A DEEP CYCLONE MOVING NORTH OF THE US/CANADIAN BORDER AT THAT TIME
INTERACT WITH MOISTURE EXPECTED ACROSS THE REGION. AS MENTIONED IN
EARLIER DISCUSSIONS...THE TROUGHING MIGHT BE HELD IN PLACE FOR A
WHILE WITH BLOCKING PATTERN DOWNSTREAM HOLD THE PATTERN ROUGHLY IN
PLACE. THE CONTINUED ACTIVE PATTERN MY CREATE SOME HYDROLOGY
CONCERNS GIVEN THE RECENT WET PATTERN.

&&

.AVIATION.../06Z TAF ISSUANCE/
THE TAF PERIOD WILL BE ACTIVE AS AN AREA OF SHOWERS AND
THUNDERSTORMS MOVES IN FROM THE WEST EARLY THIS MORNING...WITH
DEVELOPMENT LATER TODAY. FOR THE FIRST ROUND OF STORMS...IT
APPEARS THAT THE BEST FORCING WILL BE OFF TO THE NORTH...SO HAVE
ONLY A THUNDER MENTION AT KAXN AND KSTC THIS MORNING.
HOWEVER...STORMS WILL REDEVELOP AS A FRONTAL BOUNDARY MOVES
THROUGH THE REGION THIS AFTERNOON AND EVENING. TRIED TO TIME THE
THUNDERSTORMS WITH SMALL SHORTLIVED FROM GROUPS...BUT THESE WILL
LIKELY NEED TO BE ADJUSTED AS THE TIMING AND CONFIDENCE INCREASES.

KMSP...STORMS SHOULD HOLD OFF THIS MORNING. A FEW SHORT-RANGE MODELS
INDICATE CONVECTION OVER THE NEXT FEW HOURS ACROSS THE METRO
AREA...BUT OVERALL THE BEST FORCING FOR STORMS WILL BE ACROSS THE
NORTH. TODAY SHOULD BE VFR...WITH AFTERNOON SHOWERS AND
THUNDERSTORMS DEVELOPING ACROSS CENTRAL MINNESOTA AND SPREADING
INTO KMSP BY 22 OR 23Z. THESE SHOULD CLEAR OUT OVERNIGHT.

/OUTLOOK/
FRIDAY...VFR WITH -TSRA POSSIBLE BUT LOW CONFIDENCE.
SATURDAY...MVFR/VFR WITH TSRA POSSIBLE. BEST CHANCES AFTN/EVN.
SUNDAY...MVFR/VFR WITH TSRA POSSIBLE BUT LOW CONFIDENCE.

&&

.MPX WATCHES/WARNINGS/ADVISORIES...
MN...NONE.
WI...NONE.
&&

CLF/JRB

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
554 AM CDT THU JUN 14 2012

MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028-
151100-
DOUGLAS-TODD-MORRISON-MILLE LACS-KANABEC-STEVENS-POPE-STEARNS-
BENTON-SHERBURNE-ISANTI-CHISAGO-LAC QUI PARLE-SWIFT-CHIPPEWA-
KANDIYOHI-MEEKER-WRIGHT-HENNEPIN-ANOKA-RAMSEY-WASHINGTON-
YELLOW MEDICINE-RENVILLE-MCLEOD-SIBLEY-CARVER-SCOTT-DAKOTA-
REDWOOD-BROWN-NICOLLET-LE SUEUR-RICE-GOODHUE-WATONWAN-BLUE EARTH-
WASECA-STEELE-MARTIN-FARIBAULT-FREEBORN-POLK-BARRON-RUSK-
ST. CROIX-PIERCE-DUNN-PEPIN-EAU CLAIRE-
554 AM CDT THU JUN 14 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND
SOUTHERN MINNESOTA... AND WEST CENTRAL WISCONSIN.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS WILL CONTINUE MOVING ACROSS CENTRAL MINNESOTA AND
WEST CENTRAL WISCONSIN THIS MORNING. THE STRONGEST OF THESE STORMS
WILL PRODUCE HAIL UP TO ONE INCH ALONG WITH HEAVY DOWNPOURS AND A
LOT OF PEA SIZE HAIL. MOST OF THESE STORMS WILL BE WEAK.

THE SEVERE WEATHER THREAT INCREASES THIS AFTERNOON AND EVENING
WHEN A WARM FRONT LIFTS NORTH AND ADDS WARM AND MOISTURE TO THE
ATMOSPHERE. THERE IS A SLIGHT RISK FOR SEVERE WEATHER THIS
AFTERNOON AND EVENING. HAIL...DAMAGING STRAIGHT LINE WINDS...AND
EVEN A COUPLE TORNADOES CAN NOT BE RULED OUT TODAY. THE BEST
TORNADO THREAT IS CONCENTRATED IN EAST CENTRAL MINNESOTA AND WEST
CENTRAL WISCONSIN. THIS INCLUDES THE TWIN CITIES METRO AREA. THE
HAIL AND WIND THREAT IS EXPECTED OVER A MUCH LARGER PORTION OF
MINNESOTA AND WESTERN WISCONSIN. THE FAVORABLE TIMING FOR SEVERE
WEATHER IS BETWEEN 4 PM THIS AFTERNOON AND 9 PM THIS EVENING.

STAY TUNED TODAY FOR ANY POTENTIAL SEVERE WEATHER WATCHES AND
WARNINGS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

ADDITIONAL THUNDERSTORMS ARE POSSIBLE THIS WEEKEND AS A WARM
FRONT LIFTS INTO THE AREA AND ANOTHER COLD FRONT PASSES THROUGH.
ALTHOUGH THERE IS STILL SOME UNCERTAINTY...A FEW STRONG TO SEVERE
STORMS ARE POSSIBLE SATURDAY AFTERNOON AND EVENING. THE WEATHER
PATTERN LOOKS LIKE IT WILL REMAIN ACTIVE INTO EARLY IN THE WEEK.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON
AND EVENING.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
928 AM CDT THU JUN 14 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0925 AM     HAIL             STEWART                 44.73N 94.49W
06/14/2012  M0.75 INCH       MCLEOD             MN   TRAINED SPOTTER

&&

JVM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
954 AM CDT THU JUN 14 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0950 AM     HAIL             BELLE PLAINE            44.62N 93.76W
06/14/2012  E0.50 INCH       SCOTT              MN   EMERGENCY MNGR

&&

DRL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1004 AM CDT THU JUN 14 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0950 AM     HAIL             BELLE PLAINE            44.59N 93.83W
06/14/2012  E0.50 INCH       SCOTT              MN   EMERGENCY MNGR

&&

DRL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1016 AM CDT THU JUN 14 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0928 AM     HAIL             GREEN ISLE              44.68N 94.01W
06/14/2012  M0.75 INCH       SIBLEY             MN   TRAINED SPOTTER

            DIME SIZED HAIL.

0950 AM     HAIL             SHAKOPEE                44.77N 93.48W
06/14/2012  M0.75 INCH       SCOTT              MN   TRAINED SPOTTER

            DIME SIZED HAIL AT MARSCHALL ROAD.

&&

MKM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1021 AM CDT THU JUN 14 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0900 AM     HAIL             EDEN PRAIRIE            44.85N 93.46W
06/14/2012  M0.75 INCH       HENNEPIN           MN   FIRE DEPT/RESCUE

&&

L SCHALLER

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1022 AM CDT THU JUN 14 2012

MNZ060>063-066>070-075>078-WIZ024-141600-
ANOKA-CARVER-DAKOTA-GOODHUE-HENNEPIN-LE
SUEUR-MCLEOD-NICOLLET-PIERCE-RAMSEY-RICE-SCOTT-SIBLEY-WASHINGTON-
1022 AM CDT THU JUN 14 2012

AT 1017 AM CDT...WEATHER SERVICE RADAR WAS TRACKING AN LARGE CLUSTER
OF STRONG THUNDERSTORMS OVER PARTS OF SOUTH CENTRAL AND EAST CENTRAL
MINNESOTA. THE STRONGEST STORM WAS LOCATED JUST SOUTH OF GAYLORD AND
JUST EAST OF LAFAYETTE. THE STORMS WERE MOVING SOUTHEAST AT 20 MPH.

HAIL UP TO NICKEL SIZE AND WINDS UP TO 40 MPH ARE EXPECTED WITH THE
STRONGER STORMS.

* LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
  NEW ROME.
  LE SUEUR.
  ST HENRY.

LAT...LON 4518 9332 4457 9257 4422 9368 4469 9430
TIME...MOT...LOC 1518Z 302DEG 18KT 4441 9423