Alert archive / Missouri / Special Weather Statements in 2011

Special Weather Statement, NWS Kansas City, MO

August 20, 2011Cooper County, Missouri

NWS Kansas City, MO issued this special weather statement at Aug 20, 2011, 4:20 AM CDT for Cooper County, Missouri. It was in force for 40 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: Aug 20, 2011, 4:20 AM CDT (09:20 UTC)
Expired: Aug 20, 2011, 5:00 AM CDT
In force: 40 min
Issued by: NWS Kansas City, MO

County Cooper County, MO

The radar

The Pleasant Hill radar (KEAX), 130 km from the middle of the area, began a volume at 09:19 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

Springfield, MO (KSGF), launched 00:00Z, 9.3 hours before the alert went out and 227 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: 2387 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 1498 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.2

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 Aug 20, 3:57 AM CDT, 23 minutes earlier.

Area forecast discussion, Aug 20, 3:57 AM CDT, 23 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
357 AM CDT SAT AUG 20 2011

.DISCUSSION...

ANOTHER NIGHT OF ACTIVE WEATHER IS ONGOING IN EASTERN KANSAS AND
NORTHERN MISSOURI. A SHORTWAVE MOVING OVER THE TOP OF THE FLATTENED
RIDGE...THAT IS PREVAILING ACROSS THE NATION...SPARKED MORE
CONVECTION FRIDAY EVENING. SOUNDINGS FORM TOPEKA AND OMAHA BOTH
INDICATE THAT THERE WAS A STRONG INVERSION IN PLACE ACROSS THE
REGION...BUT THAT THERE WAS ALSO STEEP MID-LEVEL LAPSE RATES ALOFT AS
H5 TEMPERATURES WERE MEASURED TO BE -9C TO -10C...WHICH IS RATHER COOL
FOR MID-AUGUST. THESE STORMS ROAD ON THE NORTHERN EDGE OF A MODEST
AREA 30 KNOT 0-6KM SHEAR THANKS TO A WEAK LOW LEVEL JET THAT POINTED
INTO THE BACK SIDE OF THE STORMS MOVING THROUGH NORTHEASTERN KANSAS
INTO NORTHWEST MISSOURI. WHILE LARGE HAIL AND DAMAGING WINDS
/SOFTBALL SIZED HAIL WITH 60+ MPH WINDS/ WERE OBSERVED...THESE
STORMS ARE NOW MOVING INTO A LESS FAVORABLE ENVIRONMENT AS THEY PUSH
EAST INTO CENTRAL MISSOURI. SO...WHILE THESE STORMS MAY PRODUCE SOME
MORE SEVERE WEATHER THROUGH THE EARLY MORNING HOURS...THE PRIMARY
THREAT FROM THESE STORMS IS EXPECTED TO TRANSITION INTO A FLOODING
THREAT AS THESE STORMS HAVE PUT DOWN FAIRLY HIGH RAINFALL AMOUNTS
ACROSS AREAS THAT RECEIVED HEAVY RAIN THE PREVIOUS NIGHT...NAMELY IN
EAST CENTRAL KANSAS AND WEST CENTRAL MISSOURI. THE SOUTHWEST LOW
LEVEL JET WILL VEER THROUGH THE MORNING HOURS...BUT WILL CONTINUE TO
POINT INTO THE BACK SIDE OF THE MCS THAT HAS DEVELOPED FROM THESE
STORMS...HELPING REDEVELOP STORMS IN EASTERN KANSAS THAT WILL MOVE
THROUGH MISSOURI A LITTLE FARTHER SOUTH EACH TIME THROUGH THE MID-
MORNING HOURS. THIS ACTIVITY IS EXPECTED TO KEEP STORMS BUBBLING UP
ACROSS EASTERN KANSAS THROUGH SUNRISE. THEREFORE WILL BE KEEPING THE
FLASH FLOOD WATCH IN PLACE FOR AREAS FROM DONIPHAN COUNTY KANSAS
SOUTH THROUGH THE KANSAS CITY METRO THROUGH THE MID-MORNING HOURS.

FOR LATER TODAY...ELEVATED BOUNDARY LOOKS TO TAKE UP RESIDENCE
ACROSS NORTHERN MISSOURI AS THE SHORTWAVE MOVES EAST. CONVECTION
FROM THIS MORNING SHOULD LEAVE SOME BOUNDARIES WALLOWING
AROUND...WHICH WITH A BAROCLINIC ZONE ALOFT...WILL RESULT IN A
STORMY DAY ACROSS OUR FORECAST AREA...WITH SHOWERS AND THUNDERSTORMS
PERCOLATING ACROSS THE REGION AS THE MCV FROM THE EARLY MORNING
HOURS MOVES EAST. THESE STORMS...OR AT LEAST THE CLOUD COVER...WILL
KEEP OUR TEMPERATURES IN CHECK ACROSS NORTHERN MISSOURI...MITIGATING
THE SEVERE POTENTIAL ACROSS FAR NORTHERN MISSOURI...BUT AREAS FROM
EAST CENTRAL KANSAS IN CENTRAL MISSOURI MAY BE ABLE TO RECOVER
ENOUGH IN THE HEAT OF THE DAY TO SPARK STRONG THUNDERSTORMS ACROSS
AREAS ALONG AND SOUTH OF INTERSTATE 70.

LOOKING INTO SUNDAY...TEMPERATURES SHOULD REBOUND BACK TOWARDS
NORMAL AS THE LACK OF CLOUD COVER AND-OR CONVECTION SHOULD ALLOW THE
REGION TO REALIZE NEAR NORMAL TEMPERATURES.

FOR THE WORK WEEK...MODELS CONTINUE TO POINT AT A NORTHWEST FLOW
DOMINATING THE FORECAST THROUGH THE WORK WEEK. THIS WILL ALLOW A
FRONTAL BOUNDARY TO SHIFT SOUTHWEST THROUGH THE PLAINS STATES TUESDAY
INTO WEDNESDAY...THOUGH A VARIETY OF MODEL TIMING MAKES IT DIFFICULT
TO SAY WITH ANY CONFIDENCE WHICH DAYS THIS COMING WORK WEEK WILL SEE
THE BEST CHANCE FOR MORE STORMS. AT THIS TIME HAVE KEPT CHANCE POPS
FOR MONDAY AS WARM AIR ADVECTION LOOKS TO SPREAD EAST INTO MISSOURI
AS THE RIDGE TO OUR WEST EXPANDS IN OUR DIRECTION AS ANOTHER
SHORTWAVE TOPS THE RIDGE AXIS. CHANCE POPS PERSIST INTO TUESDAY AS
THAT SHORTWAVE SHIFTS SOUTHEAST THROUGH THE NORTHERN
PLAINS...PUSHING A FRONTAL BOUNDARY THROUGH THE REGION SOMETIME
TUESDAY AFTERNOON THROUGH WEDNESDAY MORNING...AFTER WHICH
TEMPERATURES NEAR NORMAL WILL LIKELY TO PREVAIL AS A MODIFIED
SURFACE HIGH SLIDES THROUGH THE CENTRAL PLAINS.

CUTTER

&&

.AVIATION...

FOR 06Z TAFS...FOCUS IS ON THE SHOWER AND THUNDERSTORM ACTIVITY THAT
IS IMPACTING THE TAF SITES AND WILL PERSIST THROUGH THE OVERNIGHT
HOURS AND POSSIBLY INTO MID SATURDAY MORNING. MODELS CONTINUE TO
STRUGGLE IN GETTING A HANDLE ON THIS SYSTEM...SO CONFIDENCE WITH
REGARDS TO THE TIMING OF PRECIPITATION THROUGH THE PERIOD IS FAIRLY
LOW. BEST THUNDERSTORM ACTIVITY WILL BE DURING THE EARLY OVERNIGHT
HOURS AS THE LINE THAT ORIGINATED IN SOUTHEAST NEBRASKA CONTINUES TO
TRACK SOUTHWARD ACROSS THE TAF SITES AND THE ACTIVITY THAT DEVELOPED
OVER CENTRAL KANSAS CONTINUES TO PROGRESS EASTWARD TOWARD THE KS/MO
BORDER. SOME OF THESE THUNDERSTORMS COULD BE CAPABLE OF PRODUCING
STRONG GUSTY WINDS. ONCE THE LINE OF THUNDERSTORMS OVER EASTERN
KANSAS MOVES PAST THE TAF SITES...SHOWERS WILL PERSIST WITH ISOLATED
THUNDERSTORM ACTIVITY. COULD SEE A BREAK IN THE PRECIPITATION BY
LATE MORNING/EARLY AFTERNOON BUT CANNOT RULE OUT THE POTENTIAL FOR
SHOWERS AND THUNDERSTORMS TO REDEVELOP DURING THE AFTERNOON/EARLY
EVENING HOURS. DUE TO THE UNCERTAINTY OF AFTERNOON PRECIP
CHANCES...HAVE KEPT THE PROB30 MENTION. WILL CONTINUE TO FINE-TUNE
WITH FUTURE UPDATES.

ACH

&&

.EAX WATCHES/WARNINGS/ADVISORIES...
MO...FLASH FLOOD WATCH UNTIL 10 AM CDT THIS MORNING FOR MOZ020>022-
     028>030-037-038.

KS...FLASH FLOOD WATCH UNTIL 10 AM CDT THIS MORNING FOR KSZ025-
     102>105.

&&

WFO EAX

Hazardous weather outlook, Aug 19, 7:02 PM CDT, 9 hours 18 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
702 PM CDT FRI AUG 19 2011

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-201130-
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-
702 PM CDT FRI AUG 19 2011

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

.DAY ONE...TONIGHT

THUNDERSTORMS ARE POSSIBLE LATE TONIGHT INTO EARLY SATURDAY MORNING
AS A THUNDERSTORM COMPLEX MOVES OUT OF NORTHERN AND CENTRAL KANSAS.
THE SEVERE THREAT LOOKS TO BE MINIMAL AT THIS TIME...BUT IT APPEARS
THAT THE STORMS MAY BE ABLE TO PRODUCE SMALL HAIL AND GUSTY WINDS
WITH LOCALLY HEAVY RAIN. AREAS THAT HAVE THE GREATEST POTENTIAL TO
RECEIVE STORMS ARE ALONG AND NORTH OF A LINE FROM CLINTON TO PRINCETON.
LOCALLY HEAVY RAIN WITH THESE STORMS COULD RESULT IN MINOR FLOODING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THUNDERSTORMS WILL LIKELY BE ONGOING SATURDAY MORNING ACROSS
PORTIONS OF THE OUTLOOK AREA. THIS ACTIVITY IS NOT EXPECTED TO BE
SEVERE. ADDITIONAL THUNDERSTORMS WILL BE POSSIBLE DURING THE
AFTERNOON HOURS WITH AN ISOLATED STORM OR TWO POSSIBLY BECOMING
SEVERE. DAMAGING WINDS AND LOCALLY HEAVY RAIN ARE POSSIBLE WITH THE
STRONGER STORMS. IN ADDITION...MINOR FLOODING WILL BE POSSIBLE...
ESPECIALLY FOR AREAS THAT RECEIVED HEAVY RAIN FROM THURSDAY AND
FRIDAY NIGHTS STORMS.

PERIODS OF SCATTERED THUNDERSTORMS ARE POSSIBLE FROM MONDAY THROUGH
WEDNESDAY. AT THIS TIME THE THREAT FOR SEVERE WEATHER REMAINS
LOW...HOWEVER SOME STORMS COULD PRODUCE BRIEF GUSTY WINDS AND SMALL
HAIL ALONG WITH HEAVY RAIN.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED TONIGHT. ANY REPORTS OF HEAVY
RAINFALL WOULD BE APPRECIATED.

MJ

In the hours before

Local storm report, Aug 20, 2:21 AM CDT, 1 hour 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
221 AM CDT SAT AUG 20 2011

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

0219 AM     TSTM WND DMG     WEATHERBY LAKE          39.24N 94.70W
08/20/2011                   PLATTE             MO   EMERGENCY MNGR

            TREES DOWN IN WEATHERBY LAKE AT HILLSIDE AND WAYLAND.

&&

ACH

Local storm report, Aug 20, 2:23 AM CDT, 1 hour 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
223 AM CDT SAT AUG 20 2011

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

0221 AM     TSTM WND GST     KANSAS CITY             39.12N 94.55W
08/20/2011  M58 MPH          JACKSON            MO   ASOS

            MKC ASOS MEASURED 50KT WIND GUST

&&

ACH

Local storm report, Aug 20, 2:57 AM CDT, 1 hour 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
257 AM CDT SAT AUG 20 2011

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

0208 AM     TSTM WND DMG     4 NE PARKVILLE          39.24N 94.62W
08/20/2011                   PLATTE             MO   EMERGENCY MNGR

            TREE ON HOUSE AT 69TH AND BERKLEY

&&

ACH

Local storm report, Aug 20, 3:08 AM CDT, 1 hour 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
308 AM CDT SAT AUG 20 2011

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

0238 AM     TSTM WND DMG     INDEPENDENCE            39.09N 94.35W
08/20/2011                   JACKSON            MO   EMERGENCY MNGR

            POWERLINES DOWN IN AREAS OF INDEPENDENCE

&&

ACH

Special weather statement, Aug 20, 3:33 AM CDT, 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
333 AM CDT SAT AUG 20 2011

MOZ038-039-044>046-053-054-200930-
BATES MO-COOPER MO-HENRY MO-JOHNSON MO-LAFAYETTE MO-PETTIS MO-SALINE
MO-
333 AM CDT SAT AUG 20 2011

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SALINE...PETTIS AND
SOUTHWESTERN COOPER COUNTIES IN CENTRAL MISSOURI...AND SOUTHEASTERN
LAFAYETTE...EASTERN JOHNSON...HENRY AND EASTERN BATES COUNTIES IN
WEST CENTRAL MISSOURI UNTIL 430 AM CDT...

AT 329 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM CONCORDIA TO 6 MILES
NORTH OF KNOB NOSTER TO 6 MILES SOUTH OF WHITEMAN AIR FORCE BASE TO
CALHOUN TO 5 MILES EAST OF APPLETON CITY...AND MOVING EAST AT 40 MPH.

WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH
HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...
  WINDSOR...SWEET SPRINGS...SEDALIA...DEEPWATER...LA MONTE...GREEN
  RIDGE...HOUSTONIA...SMITHTON...OTTERVILLE...EMMA...BROWNINGTON...
  COAL...TIGHTWAD...HUGHESVILLE...SEDALIA MEMORIAL ARPT AND CLIFTON
  CITY.

THIS WILL IMPACT

 I-70 BETWEEN MILE MARKERS 46 AND 85.

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 3821 9402 3829 9425 3848 9401 3862 9389
      3886 9383 3908 9381 3897 9306 3869 9300
      3869 9305 3853 9306 3853 9329 3850 9329
      3851 9351 3821 9352 3820 9354 3822 9356
      3820 9356
TIME...MOT...LOC 0833Z 288DEG 35KT 3903 9356 3884 9347
          3863 9350 3840 9361 3817 9389

MJ

Special weather statement, Aug 20, 4:20 AM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
420 AM CDT SAT AUG 20 2011

MOZ046-201000-
COOPER MO-
420 AM CDT SAT AUG 20 2011

...SIGNIFICANT WEATHER ADVISORY FOR COOPER COUNTY UNTIL 500 AM CDT...

AT 414 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR SMITHTON...OR 5 MILES EAST OF SEDALIA...
MOVING EAST AT 40 MPH.

WIND GUSTS UP TO 45 MPH ARE EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  OTTERVILLE...PILOT GROVE...BUNCETON...CLIFTON CITY...PRAIRIE HOME
  AND WOOLDRIDGE.

LAT...LON 3868 9262 3869 9306 3889 9305 3891 9250
TIME...MOT...LOC 0920Z 272DEG 32KT 3872 9306

HAWBLITZEL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 9:35 PM CDT	Flash Flood Watch	EAX	Andrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 11 more	9 hr
Aug 19, 11:34 PM CDT	Severe Thunderstorm Warning	EAX	Platte	41 min
Aug 20, 12:13 AM CDT	Severe Thunderstorm Warning	EAX	Platte	47 min
Aug 20, 12:45 AM CDT	Severe Thunderstorm Warning	EAX	Clay, Platte	45 min
Aug 20, 1:16 AM CDT	Severe Thunderstorm Warning	EAX	Buchanan, Platte	29 min
Aug 20, 1:21 AM CDT	Severe Thunderstorm Warning	EAX	Clay, Clinton	24 min
Aug 20, 1:31 AM CDT	Areal Flood Advisory	EAX	Clay, Platte	5 hr
Aug 20, 1:46 AM CDT	Areal Flood Advisory	EAX	Jackson	5 hr
Aug 20, 1:52 AM CDT	Special Weather Statement	EAX	Clay, Jackson, Platte	38 min
Aug 20, 2:02 AM CDT	Severe Thunderstorm Warning	EAX	Cass, Clay, Jackson, Johnson, Lafayette, Platte and 1 more	43 min
Aug 20, 2:27 AM CDT	Severe Thunderstorm Warning	EAX	Cass, Clay, Jackson, Johnson, Lafayette, Ray	48 min
Aug 20, 3:04 AM CDT	Severe Thunderstorm Warning	EAX	Cass, Henry, Jackson, Johnson, Lafayette, Pettis and 2 more	41 min
Aug 20, 3:33 AM CDT	Special Weather Statement	EAX	Henry, Johnson, Lafayette, Pettis	57 min
Aug 19, 10:59 PM CDT	Special Weather Statement	EAX	Atchison	46 min
Aug 19, 11:04 PM CDT	Severe Thunderstorm Warning	EAX	Atchison	41 min
Aug 20, 1:25 AM CDT	Areal Flood Advisory	EAX	Atchison, Leavenworth	5 hr
Aug 20, 5:21 AM CDT	River Flood Warning	EAX	Atchison, Leavenworth	52 hr

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.