Alert archive / Kansas / Special Weather Statements in 2011

Special Weather Statement, NWS Topeka, KS

August 20, 2011Jackson County, Jefferson County, Kansas

NWS Topeka, KS issued this special weather statement at Aug 20, 2011, 12:44 AM CDT for Jackson County, Jefferson County, Kansas. It was in force for 31 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, 12:44 AM CDT (05:44 UTC)
Expired: Aug 20, 2011, 1:15 AM CDT
In force: 31 min
Issued by: NWS Topeka, KS

Counties Jackson County, KS, Jefferson County, KS

The radar

The Topeka radar (KTWX), 76 km from the middle of the area, began a volume at 05:44 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 00:00Z, 5.7 hours before the alert went out and 47 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: 1999 J/kg
Mixed-layer CIN: -345 J/kg
Mixed-layer LCL: 1353 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 287 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Topeka, KS wrote its last area forecast discussion before this special weather statement went out at Aug 20, 12:20 AM CDT, 24 minutes earlier.

Area forecast discussion, Aug 20, 12:20 AM CDT, 24 minutes before

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Hazardous weather outlook, Aug 19, 4:53 PM CDT, 7 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE TOPEKA KS
453 PM CDT FRI AUG 19 2011

KSZ008>012-020>024-026-034>040-054>056-058-059-202200-
REPUBLIC-WASHINGTON-MARSHALL-NEMAHA-BROWN-CLOUD-CLAY-RILEY-
POTTAWATOMIE-JACKSON-JEFFERSON-OTTAWA-DICKINSON-GEARY-MORRIS-
WABAUNSEE-SHAWNEE-DOUGLAS-LYON-OSAGE-FRANKLIN-COFFEY-ANDERSON-
453 PM CDT FRI AUG 19 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL...NORTH
CENTRAL AND NORTHEAST KANSAS.

.DAY ONE...TONIGHT.

THUNDERSTORMS ARE EXPECTED TO SPREAD EASTWARD ACROSS MUCH OF
THE AREA THIS EVENING AND OVERNIGHT. HEAVY RAINFALL OF AN INCH OR
GREATER IS POSSIBLE...WHICH WILL INCREASE FLOODING POTENTIAL...
PARTICULARLY IN THOSE AREAS THAT RECEIVED HEAVY RAINFALL ON
THURSDAY NIGHT. SOME OF THE STRONGER STORMS MAY ALSO PRODUCE SMALL
HAIL AND GUSTY WINDS...WITH A LOW END THREAT OF SEVERE WEATHER
NORTHWEST OF A HOLTON TO ABILENE LINE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

THUNDERSTORMS CHANCES WILL LINGER ACROSS THE ENTIRE AREA INTO
SATURDAY AFTERNOON. ADDITIONAL ROUNDS OF THUNDERSTORMS WILL BE
POSSIBLE SUNDAY NIGHT THROUGH EARLY WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED TO BE NEEDED THROUGH TONIGHT.

In the hours before

Local storm report, Aug 19, 11:42 PM CDT, 1 hour 2 minutes before

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Local storm report, Aug 19, 11:50 PM CDT, 54 minutes before

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Local storm report, Aug 20, 12:09 AM CDT, 35 minutes before

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Special weather statement, Aug 20, 12:15 AM CDT, 29 minutes before

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Local storm report, Aug 20, 12:22 AM CDT, 22 minutes before

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Special weather statement, Aug 20, 12:44 AM CDT, 0 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
Aug 19, 8:57 PM CDT	Special Weather Statement	TOP	Cloud, Ottawa	48 min
Aug 19, 9:25 PM CDT	Flash Flood Watch	TOP	Brown, Douglas, Jackson, Jefferson, Nemaha, Pottawatomie and 1 more	7 hr
Aug 19, 9:55 PM CDT	Special Weather Statement	TOP	Brown	50 min
Aug 19, 10:35 PM CDT	Special Weather Statement	TOP	Brown	40 min
Aug 19, 10:59 PM CDT	Severe Thunderstorm Warning	TOP	Jackson	16 min
Aug 19, 11:26 PM CDT	Severe Thunderstorm Warning	TOP	Jefferson	49 min
Aug 20, 12:15 AM CDT	Special Weather Statement	TOP	Jackson	30 min
Aug 20, 1:12 AM CDT	Special Weather Statement	TOP	Jefferson	33 min
Aug 20, 1:22 AM CDT	Areal Flood Advisory	TOP	Brown, Douglas, Jackson, Jefferson, Nemaha, Shawnee	113 min
Aug 20, 1:45 AM CDT	Special Weather Statement	TOP	Douglas	30 min

Nearby

Special Weather Statements in Kansas, 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.