Special Weather Statement, NWS Twin Cities, MN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
654 AM CDT SAT JUL 12 2014

.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 248 AM CDT SAT JUL 12 2014

IT'S WARM AND MUGGY ACROSS THE FORECAST AREA THIS MORNING...BUT SO
FAR THE HEAVY RAIN HAS REMAINED JUST TO THE SOUTH AND WEST
ACROSS SD/NE/IA. THIS SHOULD CHANGE OVER THE NEXT SEVERAL HOURS AS
MORE ACTIVITY IS EXPECTED TO FORM FARTHER NORTHEAST...ACROSS
SOUTHERN MINNESOTA. THE DEWPOINTS ARE EXPECTED TO SLOWLY FALL
TODAY...BUT THERE WON'T BE A DRAMATIC CHANGE IN THE AIRMASS
LOCALLY UNTIL NORTHWEST FLOW DEVELOPS ON SUNDAY.

WELL YOU REALLY WOULDN'T KNOW IT...BUT THERE IS A SLOW MOVING COLD
FRONT CREEPING SOUTHEAST ACROSS MINNESOTA EARLY THIS MORNING.
TEMPS AND DEWPOINTS ACROSS PORTIONS OF NORTHERN MN ARE 5-15
DEGREES COOLER THAN THEY WERE AT THIS TIME FRIDAY MORNING. THE
WIDESPREAD THUNDERSTORMS OFF TO OUR SOUTH AND WEST ARE CLOSER TO
THE SURFACE WARM FRONT IN AN AREA OF GOOD MID-LEVEL WARM ADVECTION
AND FGEN. THERE ARE ALSO PWATS NEAR 2" AND GOOD 850-300MB
THICKNESS DIFFLUENCE ACROSS IA...SO THERE IS A LOT WORKING IN
FAVOR FOR HEAVY RAIN IN AREAS TO OUR SOUTH. THAT BEING
SAID...SOUTHERN MN SHOULD SEE A SLIGHT INCREASE IN 925-850MB
MOISTURE TRANSPORT LATE THIS MORNING WITH MORE OF A SOUTHWEST
ORIENTATION TO THE LOW LEVEL FLOW VECTORS /THEY'VE BEEN NEAR ZERO
OR NORTH MOST OF THE NIGHT/. THERE IS ALSO A WEAK SHORTWAVE AND PV
FEATURE LOCATED IN ND/SD EARLY THIS MORNING...WHICH IS RESPONSIBLE
FOR THE CONVECTION FROM PIERRE, SD BACK TOWARD THE BLACK HILLS.
THIS FEATURE SHOULD MAKE IT TO THE SD/MN BORDER BY AROUND
15Z...WHICH COULD THEN KICK OFF MORE THUNDERSTORMS LATE THIS
MORNING AND INTO THE AFTERNOON. IN THE MEANTIME...WE ARE ALREADY
SEEING ACTIVITY IN SD TRANSLATE FARTHER EAST AND APPROACH THE
STATE LINE...NOT TO MENTION A COUPLE SHOWERS AND ENHANCED CUMULUS
DEVELOPMENT GOING UP ALONG THE SLOW MOVING COLD FRONT IN
MINNESOTA. THE SIGNAL FOR WIDESPREAD HEAVY RAIN OR EVEN WIDESPREAD
RAIN ISN'T GREAT TODAY...BUT THERE IS STILL PLENTY OF MOISTURE
AROUND AND ENOUGH FORCING TO JUSTIFY 40-70% RAIN ACROSS THE
FORECAST AREA. WE ARE SIMPLY NOT EXACTLY SURE WHICH FORCING
MECHANISM WILL DOMINATE AND AT WHAT TIME. THE AVAILABLE CAM
GUIDANCE OVERNIGHT...DOES SUGGEST A COUPLE DISTINCT AREAS OF
CONVECTIVE INITIATION ACROSS THE FORECAST TODAY /ONE NORTH AND ONE
SOUTH/...BUT THERE IS CONSIDERABLE DIFFERENCES IN TIMING AND
PLACEMENT...SO IT IS DIFFICULT TO INCLUDE HIGHER THAN 70-75%
CHANCE OF RAIN AT ANY ONE LOCATION GIVEN THE UNCERTAINTY. THUNDER
DOES SEEM MUCH MORE LIKELY ACROSS SOUTHERN MN WHEN COMPARED TO
WHAT IS EXPECTED IN CENTRAL MN AND EVEN WEST CENTRAL MN.

.LONG TERM...(SUNDAY THROUGH FRIDAY)
ISSUED AT 248 AM CDT SAT JUL 12 2014

THE PERIOD WILL BEGIN WITH A CDFNT HAVING JUST SANK TO THE S OF
THE MPX CWFA...AND THIS WILL BEGIN THE POTENT CAA ADVERTISED FOR
THE N-CENTRAL CONUS OVER THE PAST SEVERAL DAYS. WHILE THE CDFNT
DROPS FURTHER S AND E DURG THE DAY SUN AND SUN NIGHT...A DEEP UPR
LVL CUTOFF LOW WILL DROP S FROM CENTRAL CANADA INTO THE GRT LKS
SUN NIGHT INTO MON. THERE WILL BE ENOUGH SEPARATION BETWEEN BOTH
FEATURES SUCH THAT A DRY DAY ON SUN FOR THE ENTIRE CWFA LOOKS IN
ORDER. HOWEVER...AS THE UPR LOW NEARS...SEVERAL SHTWV TROUGH AXES
WILL ROTATE ARND THE WRN FRINGES OF THE UPR LOW. IN ADDITION...A
WEAK POST-FRONTAL SFC TROUGH WILL ALSO DROP THRU THE REGION ON
MON...ALLOWING FOR SCATTERED RAIN SHWRS TO DEVELOP ACRS THE AREA.
AS THE UPR LOW PULLS AWAY FROM THE AREA MON NIGHT INTO TUE...THE
POTENTIAL FOR PRECIP WILL ALSO SHIFT OFF TO THE E. THUS LEAVING
THE MAIN STORY TO BE THE DROP IN TEMPERATURES. H85 TEMPS STILL
LOOK TO DROP TO THE 4 TO 6 DEG C RANGE...WELL BELOW NORMAL FOR
MID-JULY...AND THIS WILL TRANSLATE TO SFC TEMPS ARND 15 DEGREES
BELOW NORMAL. THE COLDEST AIR WILL DROP THRU THE REGION SUN NIGHT
THRU TUE NIGHT...WHERE HIGHS WILL ONLY HIT THE 60S WITH LOWS AS
FAR DOWN AS THE LWR 50S AND POTENTIALLY SOME UPR 40S IN NORMALLY
COLDER LOCATIONS. TEMPS DO LOOK TO MODERATE GOING INTO THE MID-TO-
LATE WEEK PERIOD AND THIS WILL BE ACCOMPANIED BY EXTENSIVE HIGH
PRES THAT WILL KEEP PRECIP AWAY FROM THE REGION STARTING TUE
NIGHT.

&&

.AVIATION...(FOR THE 12Z TAFS THROUGH 12Z SUNDAY MORNING)
ISSUED AT 641 AM CDT SAT JUL 12 2014

THUNDERSTORMS ARE EXPECTED TODAY ACROSS PORTIONS OF SOUTHERN
MINNESOTA AND WEST CENTRAL WISCONSIN. AS IS THE CASE WITH MOST
THUNDERSTORM EVENTS...WE ARE NOT EXACTLY SURE WHERE AND HOW LONG
THUNDER WILL LAST AT ANY GIVEN POINT. IN GENERAL...WE EXPECT
MORNING ACTIVITY TO CONTINUE AND EXPAND EAST /LIKELY INCREASING IN
COVERAGE/. THEN WE EXPECT A BIT OF A BREAK BEFORE REDEVELOPMENT
THIS AFTERNOON IN EAST CENTRAL MN AND WESTERN WI.

KMSP...
THAT STORM 20 MILES NW OF THE AIRPORT IS SLOWLY /VERY SLOWLY/
DEVELOPING S-SE WITH TIME...SO IF IT HOLDS TOGETHER IT WILL BE
REASONABLY CLOSE TO THE AIRPORT BY AROUND 13Z. IT'S MOVING SO
SLOW...THAT IF IT DOES MAKE IT TO THE AIRPORT IT WILL LIKELY HANG
AROUND FOR AWHILE. THERE SHOULD BE AFTERNOON STORMS...MOST OF THE
AVAILABLE WEATHER MODELS KEEP THIS ACTIVITY JUST NORTH OF THE
AIRPORT. IT WILL BE CLOSE THOUGH.

/OUTLOOK FOR KMSP/
SUN...VFR. NW WINDS 10-15 KTS.
MON...MVFR PSBL WITH CHC OF SHRA/TSRA. NW WINDS 15-30 KTS.
TUE...VFR. NW WINDS 10-15 KTS.

&&

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

SHORT TERM...CLF
LONG TERM...JPC
AVIATION...CLF

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1156 AM CDT SAT JUL 12 2014

MNZ041>045-047>070-073>078-082>085-091>093-WIZ014>016-023>028-
131700-
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-
1156 AM CDT SAT JUL 12 2014

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED TO SCATTERED THUNDERSTORMS ARE POSSIBLE THROUGH THIS
EVENING... ESPECIALLY SOUTH OF A LINE FROM MONTEVIDEO TO
HUTCHINSON TO THE TWIN CITIES IN MINNESOTA... TO LADYSMITH
WISCONSIN. THE THREAT FOR SEVERE WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION IS NOT ANTICIPATED.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1000 AM CDT SAT JUL 12 2014

MNZ073-074-121700-
BROWN-REDWOOD-
1000 AM CDT SAT JUL 12 2014

...LOCALIZED FLOODING IS LIKELY IN THE AREA...

AT 959 AM CDT...THUNDERSTORMS WITH HEAVY RAINFALL WERE NEARLY
STATIONARY ACROSS THE AREA. RAINFALL RATES IN EXCESS OF 2 INCHES PER
HOUR WERE OCCURRING... WITH ESTIMATED TOTALS OF OVER AN INCH SINCE 9
AM. ADDITIONAL RAINFALL IS EXPECTED BEFORE THE STORMS WEAKEN OR MOVE
OUT OF THE AREA... WHICH WILL LEAD TO FLOODING OF SMALL STREAMS...
AS WELL AS URBANIZED AND POOR DRAINAGE AREAS.

PEOPLE IN BROWN AND REDWOOD COUNTIES...SHOULD MONITOR THE WEATHER
SITUATION CLOSELY AND EXERCISE APPROPRIATE CAUTION.

EXCESSIVE WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY
ROADS...AND FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

&&

LAT...LON 4454 9559 4454 9512 4435 9478 4426 9437
      4412 9438 4416 9478 4425 9512 4440 9540

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1103 AM CDT SAT JUL 12 2014

MNZ065-073>075-121800-
BROWN-NICOLLET-REDWOOD-RENVILLE-
1103 AM CDT SAT JUL 12 2014

...LOCALIZED FLOODING IS LIKELY IN THE AREA...

AT 1102 AM CDT...THUNDERSTORMS WITH HEAVY RAINFALL WERE NEARLY
STATIONARY ACROSS THE AREA. RAINFALL RATES IN EXCESS OF 2 INCHES PER
HOUR WERE OCCURRING... WITH ESTIMATED TOTALS OF OVER AN INCH AND A
HALF SINCE 9 AM. ADDITIONAL RAINFALL IS EXPECTED BEFORE THE STORMS
WEAKEN OR MOVE OUT OF THE AREA... WHICH WILL LEAD TO FLOODING OF
SMALL STREAMS... AS WELL AS URBANIZED AND POOR DRAINAGE AREAS.

PEOPLE IN EASTERN REDWOOD...NORTHEASTERN BROWN...SOUTHEASTERN
RENVILLE AND WESTERN NICOLLET COUNTIES...SHOULD MONITOR THE WEATHER
SITUATION CLOSELY AND EXERCISE APPROPRIATE CAUTION.

EXCESSIVE RUNOFF WILL CAUSE FLOODING OF SMALL CREEKS AND
STREAMS...COUNTRY ROADS...AND FARMLAND ALONG THE BANKS OF CREEKS AND
STREAMS.

&&

LAT...LON 4425 9425 4425 9435 4427 9436 4426 9438
      4431 9459 4434 9477 4452 9512 4454 9462
      4446 9463 4433 9425

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1147 AM CDT SAT JUL 12 2014

MNZ082-091-121845-
MARTIN-WATONWAN-
1147 AM CDT SAT JUL 12 2014

...FUNNEL CLOUDS OBSERVED IN THE AREA...

AT 1144 AM CDT... FUNNEL CLOUDS WERE REPORTED NEAR THE
WATONWAN/MARTIN COUNTY LINE... NEAR ORMSBY. THESE WERE ASSOCIATED
WITH FEW VERY SLOWLY MOVING SHOWERS AND THUNDERSTORMS ALONG A
STATIONARY WIND SHIFT BOUNDARY. ADDITIONAL FUNNELS ARE POSSIBLE
THROUGH EARLY AFTERNOON AS STORMS MOVE ALONG THE BOUNDARY. ALTHOUGH
THE FUNNELS SHOULD REMAIN ALOFT... IT IS POSSIBLE THAT THEY COULD
CONTACT THE GROUND. IF THAT OCCURS... IT IS UNLIKELY THAT THEY WOULD
PRODUCE ANYTHING OTHER THAN VERY LOCALIZED MINOR DAMAGE. NORMALLY...
THEY LAST ONLY A FEW MINUTES BEFORE DISSIPATING.

THEREFORE... PERSONS IN THE AREA SHOULD NOT BECOME UNDULY ALARMED.
HOWEVER... THEY SHOULD REMAIN ON THE ALERT AND BE PREPARED TO MOVE
TO A PLACE OF SAFETY IF A FUNNEL SHOULD APPROACH THE GROUND.

ATMOSPHERIC CONDITIONS WILL CONTINUE TO BE FAVORABLE FOR THE
FORMATION OF FUNNEL CLOUDS DURING THE NEXT SEVERAL HOURS.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1151 AM CDT SAT JUL 12 2014

MNZ076-121715-
LE SUEUR-
1151 AM CDT SAT JUL 12 2014

...THUNDERSTORMS MOVING OVER LE SUEUR COUNTY THROUGH 1215 PM CDT...

AT 1147 AM CDT...WEATHER SERVICE RADAR WAS TRACKING A STRONG
THUNDERSTORM 6 MILES NORTHWEST OF LE CENTER. THIS STORM WAS MOVING
NORTHEAST AT 20 MPH.

PEA SIZE HAIL AND WINDS UP TO 30 MPH ARE EXPECTED WITH THIS STORM.

* LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
  ST THOMAS.
  HEIDELBERG.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO THE
STORM TO BE STRUCK BY LIGHTNING. SEEK SAFE SHELTER IMMEDIATELY.

&&

LAT...LON 4441 9394 4450 9390 4455 9380 4455 9353
      4454 9352 4448 9352 4447 9353
TIME...MOT...LOC 1651Z 242DEG 18KT 4448 9377

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1238 PM CDT SAT JUL 12 2014

MNZ067-069-075>077-121930-
LE SUEUR-NICOLLET-RICE-SCOTT-SIBLEY-
1238 PM CDT SAT JUL 12 2014

...LOCALIZED FLOODING IS LIKELY IN THE AREA...

AT 1237 PM CDT...THUNDERSTORMS WITH HEAVY RAINFALL WERE SLOWLY
MOVING EAST ACROSS THE AREA. RAINFALL RATES IN EXCESS OF 2
INCHES PER HOUR WERE OCCURRING... WITH ESTIMATED TOTALS OF OVER AN
INCH SINCE 11 AM. ADDITIONAL RAINFALL IS EXPECTED BEFORE THE STORMS
WEAKEN OR MOVE OUT OF THE AREA... WHICH WILL LEAD TO FLOODING OF
SMALL STREAMS... AS WELL AS URBANIZED AND POOR DRAINAGE AREAS.

PEOPLE IN NORTHEASTERN NICOLLET...NORTHERN LE SUEUR...NORTHERN
RICE...SOUTHEASTERN SIBLEY AND SOUTHERN SCOTT COUNTIES...SHOULD
MONITOR THE WEATHER SITUATION CLOSELY AND EXERCISE APPROPRIATE
CAUTION.

EXCESSIVE RUNOFF WILL CAUSE FLOODING OF SMALL CREEKS AND
STREAMS...COUNTRY ROADS...AND FARMLAND ALONG THE BANKS OF CREEKS AND
STREAMS.

&&

LAT...LON 4454 9411 4456 9392 4464 9378 4461 9328
      4447 9328 4447 9304 4441 9304 4428 9411

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1252 PM CDT SAT JUL 12 2014

MNZ069-121830-
SCOTT-
1252 PM CDT SAT JUL 12 2014

...THUNDERSTORMS MOVING OVER SCOTT COUNTY THROUGH 130 PM CDT...

AT 1251 PM CDT...WEATHER SERVICE RADAR WAS TRACKING A STRONG
THUNDERSTORM 5 MILES NORTHEAST OF NEW PRAGUE. THIS STORM WAS MOVING
NORTHEAST AT 20 MPH.

PEA SIZE HAIL AND HEAVY DOWNPOURS ARE EXPECTED WITH THIS STORM.

* LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
  HELENA.
  PRIOR LAKE.
  CREDIT RIVER.
  SAVAGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO THE
STORM TO BE STRUCK BY LIGHTNING. SEEK SAFE SHELTER IMMEDIATELY.

&&

LAT...LON 4466 9369 4479 9334 4478 9332 4471 9331
      4463 9331 4463 9327 4455 9328 4454 9348
      4455 9371
TIME...MOT...LOC 1753Z 247DEG 19KT 4461 9352