Alert archive / Kansas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 55, NWS Topeka, KS

April 26, 2009Cloud County, Kansas

NWS Topeka, KS issued this severe thunderstorm warning at Apr 26, 2009, 10:15 AM CDT for Cloud County, Kansas. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 26, 2009, 10:15 AM CDT (15:15 UTC)
Expired: Apr 26, 2009, 11:00 AM CDT
In force: 45 min
Issued by: NWS Topeka, KS
Area: Storm-based polygon

County Cloud County, KS

The radar

The Grand Island radar (KUEX), 115 km from the middle of the area, began a volume at 15:16 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, 3.3 hours before the alert went out and 181 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2039 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 200 m²/s²
0-3 km storm-relative helicity: 301 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Topeka, KS wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 26, 6:10 AM CDT, 4 hours 5 minutes earlier.

Area forecast discussion, Apr 26, 6:10 AM CDT, 4 hours 5 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TOPEKA KS
610 AM CDT SUN APR 26 2009

.UPDATE...

UPDATED FOR 12 UTC AVIATION.

.DISCUSSION...

SEE PREVIOUS DISCUSSION.

.AVIATION...

FRONT WILL CONTINUE TO LIFT NORTH WITH SOUTHERLY WINDS AOA 12 KTS
RETURNING AT TAF SITES. CONVECTION OVER CENTRAL KANSAS WILL GROW
IN COVERAGE THROUGH THE MORNING HOURS. BORDERLINE MVFR/VFR
CONDITIONS THROUGH THE PERIOD AND FLUCTUATING DURING TIMES OF
CONVECTION. ONLY MINOR CHANGES TO PREVIOUS TAF FORECAST. SFB

.PREV DISCUSSION... /ISSUED 335 AM CDT SUN APR 26 2009/

DISCUSSION...
MAIN FOCUS IS ON CONVECTION AND POTENTIAL FOR ADDITIONAL SEVERE
WEATHER AND FLOODING TODAY AND TONIGHT. SFC FRONT IS BEGINNING TO
LIFT NORTHWEST WITH A VERY MOIST AND WARM AIRMASS TO THE SOUTH OF
THE BOUNDARY. 08Z WATER VAPOR AND PROFILER DATA SHOWED AN MCV FROM
THE CONVECTION OVER NORTHERN OK LIFTING NORTHEAST ACROSS SOUTHEAST
KS. ANOTHER SHORTWAVE WAS LIFTING NORTHEAST THROUGH NORTHEAST CO AND
A THIRD WAVE WAS ROUNDING THE BASE OF THE UPPER TROUGH THROUGH
SOUTHERN AZ.

WHILE THE FOCUS FOR CONVECTION IS PRETTY CLEAR /STRONG LOW LEVEL
CONVERGENCE INTO THE SLOWLY MOVING SFC FRONT/ THE TRIGGER FOR
THUNDERSTORMS IS A LITTLE LESS CLEAR. THE FEW ELEVATED STORMS THAT
HAVE PERSISTED THIS MORNING HAVE NOT BEEN VERY INTENSE AND THINK
INCREASING SUBSIDENCE ASSOCIATED WITH THE MCV MOVING UP FROM OK MAY
TEMPORALLY INHIBIT NEW CONVECTIVE DEVELOPMENT THROUGH MID MORNING.
THE 06Z RUC SOUNDINGS DO SHOW A WEAK CAP DEVELOPING THROUGH MOD
MORNING AND THIS MAY BE IN RESPONSE TO THE MCV. NEVERTHELESS...
EXPECT THUNDERSTORMS TO DEVELOP ALONG THE FRONT BY EARLY AFTERNOON
ACROSS CENTRAL KS. MODELS SHOW REASONABLE INSTABILITY WITH AROUND
1000 J/KG WITH STRONG 0-6KM BULK SHEAR OF 45 KTS TO SUPPORT SEVERE
THUNDERSTORMS AGAIN. HAIL AND DAMAGING WINDS WILL BE THE MAIN
CONCERN...BUT ANY DISCRETE SUPERCELL COULD PRODUCE A TORNADO. THINK
THAT A LIMITING FACTOR IN THE COVERAGE OF SEVERE THUNDERSTORMS WILL
BE A LOW INHIBITION TO THE CONVECTION WHICH SHOULD NOT ALLOW FOR A
LOT OF INSTABILITY TO BUILD UP.

AS THE LOW LEVEL JET INCREASES AND THE SHORTWAVE ROUNDING THE BASE
OF THE UPPER TROUGH MOVES OUT INTO THE PLAINS...THUNDERSTORMS SHOULD
BECOME MORE WIDESPREAD INTO TONIGHT AS THE FRONT SLOWLY MOVES
SOUTHEAST ACROSS THE AREA AND SYNOPTIC SCALE FORCING INCREASES.
THREAT FOR FLOODING WILL INCREASE AS CONVECTION HAS THE POTENTIAL TO
TRAIN OVER THE SAME AREA DUE TO THE SLOW MOVEMENT OF THE FRONT.
GIVEN THE ABUNDANT MOISTURE /PWS WELL ABOVE NORMAL AT 1.5 INCHES/
HEAVY RAINFALL IS LIKELY WITH 2 TO 4 INCHES POSSIBLE BEFORE THE RAIN
ENDS ON MONDAY. BECAUSE THE MODELS ARE PULLING THE RICH MOISTURE A
LITTLE FURTHER WEST TO A SLN/BIE LINE...WILL EXPAND THE CURRENT
FLOOD WATCH TO INCLUDE DICKINSON... CLAY AND WASHINGTON COUNTIES.

CONSIDERED A WIND ADVISORY FOR EAST CENTRAL KS LATE THIS MORNING AND
EARLY AFTERNOON. THE LOW LEVEL JET OF PROGGED TO REMAIN FAIRLY
STRONG IN RESPONSE TO THE SFC LOW DEEPENING OVER THE OK/TX
PANHANDLES. HOWEVER OPTED TO NOT ISSUE AN ADVISORY ATTM THINKING
CLOUD COVER AND MODEST LOW LEVEL LAPSE RATES WOULD INHIBIT MIXING OF
THE LOW LEVEL JET WINDS. NEEDLESS TO SAY IT SHOULD BE WINDY...BUT
THINK SUSTAINED WINDS WILL STAY AROUND 25 MPH.

TEMPS WILL BE TRICKY THIS AFTERNOON WITH THE EXPECTED CLOUD COVER
AND WARM FRONT LIFTING NORTHWEST. GENERALLY WENT MORE IN LINE WITH
THE MAV GUIDANCE AS THE MET NUMBERS APPEAR TO BE A LITTLE TO COOL
ACROSS NORTH CENTRAL KS. OF COURSE THERE COULD BE A VERY TIGHT
GRADIENT DEPENDING ON WHERE THE FRONT STOPS. THIS IS ALSO TRUE FOR
LOWS TONIGHT. ADJUSTED TEMPS DOW A DEGREE OR TWO FOR MONDAY AND
TUESDAY AS SFC RIDGING AND CAA LOOK TO HOLD ON A LITTLE LONGER. NO
CHANGES WERE MADE TO THE FORECAST BEYOND TUESDAY.

WOLTERS

.TOP WATCHES/WARNINGS/ADVISORIES...FLOOD WATCH FROM 1 PM SUNDAY TO 7 AM MONDAY FOR KSZ009-KSZ010-
KSZ011-KSZ012-KSZ021-KSZ022-KSZ023-KSZ024-KSZ026-KSZ035-KSZ036-
KSZ037-KSZ038-KSZ039-KSZ040-KSZ054-KSZ055-KSZ056-KSZ058-KSZ059.

Hazardous weather outlook, Apr 26, 10:03 AM CDT, 12 minutes before

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In the hours before

Special weather statement, Apr 26, 8:52 AM CDT, 1 hour 23 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TOPEKA KS
852 AM CDT SUN APR 26 2009

KSZ010-011-261430-
MARSHALL-NEMAHA-
852 AM CDT SUN APR 26 2009

...SIGNIFICANT WEATHER ALERT FOR NEMAHA AND MARSHALL COUNTIES...

THROUGH 930 AM CDT...A SMALL CLUSTER OF THUNDERSTORMS WILL MOVE
NORTHEAST AT 35 MPH ACROSS PORTIONS OF NEMAHA AND MARSHALL COUNTIES.
NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THIS CLUSTER OF
STORMS IS CAPABLE OF PRODUCING NICKEL SIZE HAIL AND FREQUENT
LIGHTNING. SOME LOCATIONS THAT COULD BE AFFECTED INCLUDE
MARYSVILLE...FRANKFORT...OKETO...BEATTIE...AXTELL...SUMMERFIELD AND
BAILEYVILLE.

THE CLUSTER OF STORMS MAY STRENGTHEN OVER THE NEXT SEVERAL MINUTES.
BE READY TO TAKE SHELTER IN CASE A WARNING IS ISSUED.

Special weather statement, Apr 26, 8:58 AM CDT, 1 hour 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TOPEKA KS
858 AM CDT SUN APR 26 2009

KSZ036-037-261430-
GEARY-MORRIS-
858 AM CDT SUN APR 26 2009

...SIGNIFICANT WEATHER ALERT FOR GEARY AND MORRIS COUNTIES...

THROUGH 930 AM CDT...A STRONG THUNDERSTORM WILL MOVE NORTHEAST AT 40
MPH ACROSS PORTIONS OF GEARY AND MORRIS COUNTIES. NATIONAL WEATHER
SERVICE DOPPLER RADAR INDICATED THIS STORM IS CAPABLE OF PRODUCING
PENNY SIZE HAIL. SOME LOCATIONS THAT COULD BE AFFECTED INCLUDE WHITE
CITY AND GEARY STATE FISHING LAKE. MOTORISTS ALONG INTERSTATE 70
BETWEEN MILE MARKERS 305 AND 316 COULD ALSO BE AFFECTED.

A TORNADO WATCH IS ALSO IN EFFECT. STAY ALERT TO THE WEATHER IN CASE
A WARNING IS ISSUED.

GARGAN

Special weather statement, Apr 26, 9:28 AM CDT, 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TOPEKA KS
928 AM CDT SUN APR 26 2009

KSZ020-261515-
CLOUD-
928 AM CDT SUN APR 26 2009

...SIGNIFICANT WEATHER ALERT FOR CLOUD COUNTY...

THROUGH 1015 AM CDT...A SMALL CLUSTER OF THUNDERSTORMS WILL MOVE
NORTHEAST AT 35 MPH ACROSS PORTIONS OF CLOUD COUNTY. NATIONAL WEATHER
SERVICE DOPPLER RADAR INDICATED THIS CLUSTER OF STORMS IS CAPABLE OF
PRODUCING NICKEL SIZE HAIL...STRONG WINDS OF 40 TO 50 MPH AND
FREQUENT LIGHTNING. SOME LOCATIONS THAT COULD BE AFFECTED INCLUDE
AURORA AND CLYDE.

Special weather statement, Apr 26, 9:28 AM CDT, 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TOPEKA KS
928 AM CDT SUN APR 26 2009

KSZ022-036-038-261500-
GEARY-RILEY-WABAUNSEE-
928 AM CDT SUN APR 26 2009

...SIGNIFICANT WEATHER ALERT FOR RILEY...GEARY AND WABAUNSEE
COUNTIES...

THROUGH 1000 AM CDT...A STRONG THUNDERSTORM WILL MOVE NORTHEAST AT 40
MPH ACROSS PORTIONS OF RILEY...GEARY AND WABAUNSEE COUNTIES. NATIONAL
WEATHER SERVICE DOPPLER RADAR INDICATED THIS STORM IS CAPABLE OF
PRODUCING PENNY TO NICKEL SIZE HAIL. THE STRONG THUNDERSTORM WILL
OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF GEARY...RILEY AND
WABAUNSEE COUNTIES. MOTORISTS ALONG INTERSTATE 70 BETWEEN MILE
MARKERS 309 AND 325 COULD ALSO BE AFFECTED.

A TORNADO WATCH IS ALSO IN EFFECT. STAY ALERT TO THE WEATHER IN CASE
A WARNING IS ISSUED.

Local storm report, Apr 26, 9:51 AM CDT, 24 minutes before

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Special weather statement, Apr 26, 9:51 AM CDT, 24 minutes before

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The office that day

Everything else NWS Topeka, KS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 25, 7:00 PM CDT	Severe Thunderstorm Warning	TOP	Douglas, Osage, Shawnee	45 min
Apr 25, 7:39 PM CDT	Areal Flood Advisory	TOP	Douglas, Jefferson	3 hr
Apr 25, 8:17 PM CDT	Severe Thunderstorm Warning	TOP	Douglas, Jefferson	28 min
Apr 25, 11:48 PM CDT	Severe Thunderstorm Warning	TOP	Republic	42 min
Apr 25, 11:50 PM CDT	High Wind Warning	TOP	Anderson, Coffey, Douglas, Franklin, Lyon, Osage	3 hr
Apr 26, 9:36 AM CDT	Severe Thunderstorm Warning	TOP	Cloud	39 min
Apr 26, 10:49 AM CDT	Severe Thunderstorm Warning	TOP	Republic, Washington	56 min
Apr 26, 1:05 PM CDT	Severe Thunderstorm Warning	TOP	Ottawa	40 min
Apr 26, 1:07 PM CDT	Severe Thunderstorm Warning	TOP	Republic, Washington	53 min
Apr 26, 1:42 PM CDT	Severe Thunderstorm Warning	TOP	Cloud, Ottawa	48 min
Apr 26, 1:49 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Washington	26 min
Apr 26, 2:14 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Washington	46 min
Apr 26, 3:19 PM CDT	Tornado Warning	TOP	Clay, Dickinson, Geary	26 min
Apr 26, 3:50 PM CDT	Flash Flood Warning	TOP	Clay, Marshall, Washington	3 hr
Apr 26, 5:50 PM CDT	Severe Thunderstorm Warning	TOP	Dickinson, Geary, Morris, Riley, Wabaunsee	40 min
Apr 26, 5:58 PM CDT	Severe Thunderstorm Warning	TOP	Pottawatomie, Wabaunsee	27 min
Apr 26, 6:13 PM CDT	Flash Flood Warning	TOP	Dickinson, Geary, Morris	4 hr
Apr 26, 6:38 PM CDT	Severe Thunderstorm Warning	TOP	Jackson, Jefferson, Nemaha, Shawnee	37 min

Nearby

Severe Thunderstorm Warnings in Kansas, 2009 Every severe thunderstorm warning in 2009

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.