Alert archive / Missouri / Special Weather Statements in 2011

Special Weather Statement, NWS Kansas City, MO

September 9, 2011Cass County, Missouri

NWS Kansas City, MO issued this special weather statement at Sep 9, 2011, 3:17 PM CDT for Cass County, Missouri. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 9, 2011, 3:17 PM CDT (20:17 UTC)
Expired: Sep 9, 2011, 4:00 PM CDT
In force: 43 min
Issued by: NWS Kansas City, MO

County Cass County, MO

The radar

The Pleasant Hill radar (KEAX), 18 km from the middle of the area, began a volume at 20:18 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 8.3 hours before the alert went out and 124 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 44 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 1090 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Kansas City, MO wrote its last area forecast discussion before this special weather statement went out at Sep 9, 12:26 PM CDT, 2 hours 51 minutes earlier.

Area forecast discussion, Sep 9, 12:26 PM CDT, 2 hours 51 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1226 PM CDT FRI SEP 9 2011

...UPDATED AVIATION DISCUSSION...

.DISCUSSION...

CLOSED UPPER LOW/REMNANTS OF LEE NOW OVER THE LOWER OH VALLEY WILL
CONTINUE TO SPIN SLOWLY TOWARDS THE WEST. THE CWA WILL LIKELY REMAIN
IN THE NW QUAD OF THE UPPER LOW BUT SEVERAL EMBEDDED VORTICITY
MAXIMA WILL ROTATE CYCLONICALLY SW AND THRU THE CWA OVER THE NEXT
24-30 HOURS. A MODIFIED TROPICAL AIRMASS WILL ACCOMPANY THIS SYSTEM
AS IT MOVES THROUGH MO WITH ISOLATED TO SCATTERED SHOWER ACTIVITY
MAXIMIZED DURING PEAK HEATING TIME. LATEST NAM/GFS BUFR SOUNDINGS
INDICATE SOME INSTABILITY WITH THIS SYSTEM AS NOTED BY THE SKINNY
CAPE...SO A FEW THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON.
HIGHEST POPS WILL BE OVER THE FAR SOUTHEASTERN COUNTIES. QPF SHOULD
BE LOW WITH A RELATIVELY DRY SUB-CLOUD LAYER ALLOWING FOR SOME
EVAPORATION.

WITH THE ROCKIES UPPER RIDGE BENT OVER ACROSS THE NORTHERN PLAINS/MN
EFFECTIVELY SHUNTING STRONGER WESTERLIES ACROSS CANADA THE MID LEVEL
FLOW OVER THE CENTRAL U.S. WILL BE RATHER WEAK...LEADING TO A SLOW
CRAWL OF THE CLOSED. WITH THAT IN MIND WILL KEEP CHANCE POPS ACROSS
THE FAR SOUTHERN CWA ON SATURDAY. COULD BE A DECENT GRADIENT IN
CLOUD COVER ACROSS THE CWA ON SATURDAY RESULTING IN WARMER
TEMPERATURES ACROSS NORTHERN MO. MAX TEMPERATURES SOUTH OF THE MO
RIVER WILL BE IMPACTED BY ANY SHOWER ACTIVITY AND THICKER CLOUD
COVER.

WARMER RETURN FLOW SETS UP ON SUNDAY AND WILL LAST INTO TUESDAY
BEFORE A STRONGER COLD FRONT PLOWS SEWD THROUGH THE CWA. POST
FRONTAL AIRMASS APPEARS TO BE RATHER CHILLY AND BELIEVE IT NECESSARY
TO LOWER TEMPERATURES...ESPECIALLY THE MINS...WEDNESDAY THROUGH
FRIDAY. WONT GET TOO CARRIED AWAY AS CONFIDENCE LOW ON AMOUNT OF
CLOUD COVER DUE TO INCREASING MID/HIGH LEVEL WARM AIR ADVECTION. .
SHOULD WE END UP WITH CLEAR SKIES ONE COULD ARGUE GOING WAY UNDER
GUIDANCE.

MJ

&&

.AVIATION...

FOR THE 18Z TAFS...LATEST RADAR RETURNS SHOWING AN ISOLATED SHOWER
FORMING NORTHEAST OF KANSAS CITY. EXPECT MORE SHOWERS TO DEVELOP AS
THE AFTERNOON PROGRESSES. LATEST MESOANALYSIS SHOWS ABOUT 1000 J/KG
MUCAPE ACROSS NORTHERN MISSOURI SO EMBEDDED THUNDERSTORMS ARE
POSSIBLE. THE BEST COVERAGE OF ACTIVITY SHOULD BE EAST OF THE
TERMINALS SO WILL CONTINUE WITH GOING FORECAST OF SHOWERS WITH ONLY
CB MENTION. THIS ACTIVITY SHOULD MOSTLY BE DIURNALLY DRIVEN SO
COVERAGE AND INTENSITY ARE EXPECTED TO DECREASE WITH SUNSET. SATURDAY
WILL LIKELY BE A REPEAT OF TODAY BUT WITH PERHAPS A BIT MORE COVERAGE
OF PRECIPITATION. SINCE ACTIVITY SHOULD BE MAINLY DURING THE
AFTERNOON WILL KEEP MENTION OUT OF THE FORECAST AT THIS TIME. ASIDE
FROM THE SHOWER/ISOLATED STORM CHANCES VFR CONDITIONS ARE EXPECTED
THROUGH MUCH OF THE TAF VALID PERIOD WITH NORTHWESTERLY WINDS
BECOMING MORE NORTHERLY TONIGHT.

CDB

&&

.EAX WATCHES/WARNINGS/ADVISORIES...
MO...NONE.
KS...NONE.
&&

Hazardous weather outlook, Sep 9, 12:55 PM CDT, 2 hours 22 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
1255 PM CDT FRI SEP 9 2011

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-101215-
ATCHISON KS-MIAMI-LINN KS-DONIPHAN-LEAVENWORTH-WYANDOTTE-JOHNSON KS-
ATCHISON MO-NODAWAY-WORTH-GENTRY-HARRISON-MERCER-PUTNAM-SCHUYLER-
HOLT-ANDREW-DE KALB-DAVIESS-GRUNDY-SULLIVAN-ADAIR-BUCHANAN-CLINTON-
CALDWELL-LIVINGSTON-LINN MO-MACON-PLATTE-CLAY-RAY-CARROLL-CHARITON-
RANDOLPH-JACKSON-LAFAYETTE-SALINE-HOWARD-CASS-JOHNSON MO-PETTIS-
COOPER-BATES-HENRY-
1255 PM CDT FRI SEP 9 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST...NORTH CENTRAL AND
WEST CENTRAL MISSOURI...AS WELL AS EXTREME EASTERN KANSAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

ISOLATED THUNDERSTORMS WILL CONTINUE THIS AFTERNOON. NO SEVERE WEATHER
IS EXPECTED.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

ISOLATED THUNDERSTORMS ARE POSSIBLE SATURDAY AFTERNOON. NO HAZARDOUS
WEATHER IS EXPECTED WITH THIS ACTIVITY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

CDB

In the hours before

Special weather statement, Sep 9, 2:39 PM CDT, 38 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
239 PM CDT FRI SEP 9 2011

MOZ037-043-044-092030-
CASS MO-JACKSON MO-JOHNSON MO-
239 PM CDT FRI SEP 9 2011

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN JOHNSON...EASTERN
JACKSON AND NORTHEASTERN CASS COUNTIES IN WEST CENTRAL MISSOURI UNTIL
330 PM CDT...

AT 237 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM LAKE TAPAWINGO TO
LONE JACK...AND MOVING SOUTHWEST AT 25 MPH.

WIND GUSTS UP TO 45 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH
HEAVY RAIN.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...
  LAKE LOTAWANA...LEE'S SUMMIT...GREENWOOD...PLEASANT HILL...
  RAYMORE...LONE JACK...LAKE WINNEBAGO...UNITY VILLAGE...STRASBURG
  AND GUNN CITY.

THIS WILL IMPACT THE FOLLOWING INTERSTATES...

  I-70 BETWEEN MILE MARKERS 13 AND 28.
  I-470 BETWEEN MILE MARKERS 6 AND 16.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

LAT...LON 3880 9451 3916 9436 3900 9411 3892 9411
      3891 9409 3864 9411
TIME...MOT...LOC 1939Z 024DEG 24KT 3904 9437 3888 9412

SF

Local storm report, Sep 9, 2:51 PM CDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
251 PM CDT FRI SEP 09 2011

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

0246 PM     TSTM WND DMG     BLUE SPRINGS            39.02N 94.28W
09/09/2011                   JACKSON            MO   LAW ENFORCEMENT

            POWER LINES AND TREES REPORTED DOWN, JUST WEST OF HIGHWAY
            7 ON HIGHWAY 40. THUNDERSTORM WIND GUSTS WERE ESTIMATED
            UP TO 60 MPH.

&&

GAMIS

Special weather statement, Sep 9, 2:53 PM CDT, 24 minutes before

SPECIAL WEATHER STATEMENT...UPDATE
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
253 PM CDT FRI SEP 9 2011

MOZ037-043-044-092030-
CASS MO-JACKSON MO-JOHNSON MO-
253 PM CDT FRI SEP 9 2011

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN JOHNSON...EASTERN
JACKSON AND NORTHEASTERN CASS COUNTIES IN WEST CENTRAL MISSOURI UNTIL
330 PM CDT...

AT 252 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM SOUTHERN RAYTOWN TO LONE
JACK...AND MOVING SOUTHWEST AT 25 MPH.

WIND GUSTS UP TO 55 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH
PEA SIZED HAIL AND HEAVY RAIN.

AT 246 PM...BLUE SPRINGS POLICE REPORTED POWER LINES AND TREES DOWN
JUST WEST OF HIGHWAY 7 ON HIGHWAY 40.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...
  LAKE LOTAWANA...LEE'S SUMMIT...GREENWOOD...PLEASANT HILL...
  RAYMORE...LONE JACK...LAKE WINNEBAGO...UNITY VILLAGE...STRASBURG
  AND GUNN CITY.

THIS WILL IMPACT THE FOLLOWING INTERSTATES...

  I-70 BETWEEN MILE MARKERS 13 AND 28.
  I-470 BETWEEN MILE MARKERS 6 AND 16.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

LAT...LON 3880 9451 3916 9436 3900 9411 3892 9411
      3891 9409 3864 9411
TIME...MOT...LOC 1939Z 024DEG 24KT 3904 9437 3888 9412

SF

Special weather statement, Sep 9, 2:57 PM CDT, 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
257 PM CDT FRI SEP 9 2011

KSZ103-MOZ020-028-092045-
BUCHANAN MO-LEAVENWORTH KS-PLATTE MO-
257 PM CDT FRI SEP 9 2011

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PLATTE...SOUTHERN
BUCHANAN AND NORTHEASTERN LEAVENWORTH COUNTIES UNTIL 345 PM CDT...

AT 255 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR AGENCY...OR 10 MILES SOUTH OF ELWOOD...
MOVING SOUTH AT 25 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  WESTON...PLATTE CITY...LEAVENWORTH...DEARBORN...CAMDEN POINT...
  TRACY...FAUCETT...DE KALB...BEVERLY...HOOVER...EAST LEAVENWORTH...
  FORT LEAVENWORTH AND STILLINGS.

THIS WILL IMPACT THE FOLLOWING INTERSTATES...

  I-435 LOOP FROM MILE MARKERS 29 TO 35.
  I-29 BETWEEN MILE MARKERS 13 AND 43.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

IN ADDITION...THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR
LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...
FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

LAT...LON 3931 9463 3931 9495 3971 9492 3971 9469
TIME...MOT...LOC 1957Z 359DEG 15KT 3961 9480

SF

Special weather statement, Sep 9, 3:09 PM CDT, 8 minutes before

SPECIAL WEATHER STATEMENT...UPDATE
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
309 PM CDT FRI SEP 9 2011

KSZ103-MOZ020-028-092045-
BUCHANAN MO-LEAVENWORTH KS-PLATTE MO-
309 PM CDT FRI SEP 9 2011

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PLATTE...SOUTHERN
BUCHANAN AND NORTHEASTERN LEAVENWORTH COUNTIES UNTIL 345 PM CDT...

AT 307 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR DEARBORN...OR 5 MILES NORTHWEST OF TIFFANY
SPRINGS...MOVING SOUTH AT 25 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  WESTON...PLATTE CITY...LEAVENWORTH...DEARBORN...CAMDEN POINT...
  TRACY...FAUCETT...DE KALB...BEVERLY...HOOVER...EAST LEAVENWORTH...
  FORT LEAVENWORTH AND STILLINGS.

THIS WILL IMPACT THE FOLLOWING INTERSTATES...

  I-435 LOOP FROM MILE MARKERS 29 TO 35.
  I-29 BETWEEN MILE MARKERS 13 AND 43.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

IN ADDITION...THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR
LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...
FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

LAT...LON 3931 9463 3931 9495 3971 9492 3971 9469
TIME...MOT...LOC 1957Z 359DEG 15KT 3961 9480

SF

Special weather statement, Sep 9, 3:17 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
317 PM CDT FRI SEP 9 2011

MOZ043-044-092100-
CASS MO-JOHNSON MO-
317 PM CDT FRI SEP 9 2011

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN JOHNSON AND CASS
COUNTIES IN WEST CENTRAL MISSOURI UNTIL 400 PM CDT...

AT 314 PM CDT...STORM SPOTTERS REPORTED STRONG THUNDERSTORMS ALONG A
LINE EXTENDING FROM LAKE WINNEBAGO TO 5 MILES EAST OF EAST LYNNE...
AND MOVING SOUTH AT 25 MPH.

AT 305 PM CDT...AN AUTOMATED WIND SENSOR LOCATED IN LEES SUMMIT
REPORTED AN WIND GUST OF 53 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 55 MPH ARE
EXPECTED WITH THESE STORMS...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...
  RAYMORE...PECULIAR...GARDEN CITY...HARRISONVILLE...EAST LYNNE...
  CREIGHTON...FREEMAN...LA TOUR AND WEST LINE.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

IN ADDITION...THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR
LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...
FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

LAT...LON 3862 9461 3884 9451 3884 9435 3868 9401
      3857 9403 3857 9406 3845 9407
TIME...MOT...LOC 2016Z 356DEG 24KT 3884 9442 3865 9413

SF

The office that day

Everything else NWS Kansas City, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 9, 2:15 PM CDT	Special Weather Statement	EAX	Lafayette	45 min
Sep 9, 2:39 PM CDT	Special Weather Statement	EAX	Jackson	51 min
Sep 9, 2:53 PM CDT	Special Weather Statement	EAX	Jackson	37 min
Sep 9, 2:57 PM CDT	Special Weather Statement	EAX	Buchanan, Platte	48 min
Sep 9, 3:09 PM CDT	Special Weather Statement	EAX	Buchanan, Platte	36 min
Sep 9, 3:30 PM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton	24 min
Sep 9, 3:53 PM CDT	Special Weather Statement	EAX	Clay, Platte	52 min
Sep 9, 3:47 PM CDT	Special Weather Statement	EAX	Atchison	43 min
Sep 9, 4:14 PM CDT	Special Weather Statement	EAX	Wyandotte	46 min
Sep 9, 4:16 PM CDT	Severe Thunderstorm Warning	EAX	Atchison	14 min
Sep 9, 5:02 PM CDT	Special Weather Statement	EAX	Miami	28 min

Nearby

Special Weather Statements in Missouri, 2011 Every special weather statement in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.