Alert archive / Kansas / Flash Flood Watches in 2018

Flash Flood Watch 1, NWS Topeka, KS

May 2, 201818 counties in Kansas

NWS Topeka, KS issued this flash flood watch at May 2, 2018, 3:36 AM CDT for 18 counties in Kansas. It took effect at May 2, 2018, 3:00 PM CDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: May 2, 2018, 3:36 AM CDT (08:36 UTC)
In effect from: May 2, 2018, 3:00 PM CDT
Expired: May 2, 2018, 9:26 PM CDT
In force: 6 hr
Issued by: NWS Topeka, KS
Flood severity: None

Counties Anderson County, KS, Clay County, KS, Cloud County, KS, Coffey County, KS, Dickinson County, KS, Douglas County, KS, Franklin County, KS, Geary County, KS, Jackson County, KS, Jefferson County, KS, Lyon County, KS, Morris County, KS, Osage County, KS, Ottawa County, KS, Pottawatomie County, KS, Riley County, KS, Shawnee County, KS, Wabaunsee County, KS

The radar

The Topeka radar (KTWX), 7 km from the middle of the area, began a volume at 08:37 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 (KFOE), launched 00:00Z, 8.6 hours before the alert went out and 54 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: 543 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1230 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 334 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 11.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at May 2, 12:26 AM CDT, 3 hours 10 minutes earlier.

Area forecast discussion, May 2, 12:26 AM CDT, 3 hours 10 minutes before

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Hazardous weather outlook, May 2, 12:30 AM CDT, 3 hours 6 minutes before

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In the hours before

Special weather statement, May 1, 10:55 PM CDT, 4 hours 41 minutes before

Special Weather Statement
National Weather Service Topeka KS
1055 PM CDT TUE MAY 1 2018

KSZ023-024-038-039-020430-
Wabaunsee-Shawnee-Pottawatomie-Jackson-
1055 PM CDT TUE MAY 1 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SHAWNEE...
NORTHEASTERN WABAUNSEE...EASTERN POTTAWATOMIE AND JACKSON COUNTIES
UNTIL 1130 PM CDT...

At 1055 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 3 miles north of Havensville to 3 miles north
of Emmett to 3 miles south of Wamego. Movement was east at 45 mph.

Half inch hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Holton, Rossville, St. Marys, Silver Lake, Hoyt, Mayetta, Belvue,
Emmett, Denison, Circleville, Delia, Soldier, Havensville and
Potawatomi Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

A tornado watch remains in effect until midnight CDT for northeastern
Kansas.

LAT...LON 3937 9561 3908 9585 3917 9628 3935 9613
      3956 9618 3957 9556
TIME...MOT...LOC 0355Z 265DEG 37KT 3956 9607 3936 9605 3915 9630

Skow

Local storm report, May 1, 11:01 PM CDT, 4 hours 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TOPEKA KS
1101 PM CDT TUE MAY 1 2018

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

1055 PM     HAIL             2 W RILEY               39.30N 96.87W
05/01/2018  E1.75 INCH       RILEY              KS   EMERGENCY MNGR

&&

Special weather statement, May 2, 12:44 AM CDT, 2 hours 52 minutes before

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Local storm report, May 2, 12:54 AM CDT, 2 hours 42 minutes before

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Special weather statement, May 2, 1:15 AM CDT, 2 hours 21 minutes before

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Special weather statement, May 2, 1:20 AM CDT, 2 hours 16 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
May 1, 7:00 PM CDT	Severe Thunderstorm Warning	TOP	Cloud	30 min
May 1, 7:24 PM CDT	Tornado Warning Tornado observed	TOP	Clay, Cloud, Republic, Washington	36 min
May 1, 7:26 PM CDT	Tornado Warning	TOP	Ottawa	34 min
May 1, 7:52 PM CDT	Tornado Warning	TOP	Clay, Riley, Washington	38 min
May 1, 7:54 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	TOP	Ottawa	36 min
May 1, 8:01 PM CDT	Tornado Warning Considerable damage threat	TOP	Clay, Riley, Washington	34 min
May 1, 8:19 PM CDT	Severe Thunderstorm Warning	TOP	Cloud, Ottawa	41 min
May 1, 8:26 PM CDT	Tornado Warning	TOP	Clay, Dickinson, Ottawa	34 min
May 1, 8:26 PM CDT	Tornado Warning	TOP	Cloud, Ottawa	34 min
May 1, 8:33 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Riley, Washington	57 min
May 1, 8:58 PM CDT	Tornado Warning Tornado observed	TOP	Clay	32 min
May 1, 9:00 PM CDT	Severe Thunderstorm Warning	TOP	Cloud, Ottawa	45 min
May 1, 9:13 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Dickinson	47 min
May 1, 9:25 PM CDT	Tornado Warning Tornado observed	TOP	Clay, Riley	35 min
May 1, 9:27 PM CDT	Severe Thunderstorm Warning	TOP	Clay	33 min
May 1, 9:41 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Cloud, Ottawa	34 min
May 1, 9:47 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Geary, Pottawatomie, Riley	43 min
May 1, 9:54 PM CDT	Tornado Warning	TOP	Pottawatomie, Riley	36 min
May 1, 10:11 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Cloud, Ottawa	34 min
May 1, 10:15 PM CDT	Severe Thunderstorm Warning	TOP	Pottawatomie, Riley, Wabaunsee	45 min
May 1, 10:19 PM CDT	Areal Flood Advisory	TOP	Clay, Cloud, Ottawa	3 hr
May 1, 10:24 PM CDT	Severe Thunderstorm Warning	TOP	Cloud, Ottawa	36 min
May 1, 10:27 PM CDT	Tornado Warning	TOP	Marshall, Nemaha, Pottawatomie	33 min
May 1, 10:40 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Geary, Pottawatomie, Riley	35 min
May 1, 10:55 PM CDT	Special Weather Statement	TOP	Jackson	35 min
May 1, 11:08 PM CDT	Severe Thunderstorm Warning	TOP	Pottawatomie, Riley	37 min
May 1, 11:35 PM CDT	Severe Thunderstorm Warning	TOP	Jackson, Pottawatomie	25 min
May 1, 11:49 PM CDT	Severe Thunderstorm Warning	TOP	Pottawatomie, Riley	26 min
May 2, 12:11 AM CDT	Severe Thunderstorm Warning	TOP	Pottawatomie	34 min
May 2, 12:44 AM CDT	Special Weather Statement	TOP	Jackson	31 min
May 2, 1:15 AM CDT	Special Weather Statement	TOP	Marshall	30 min
May 2, 1:20 AM CDT	Special Weather Statement	TOP	Jefferson	40 min
May 2, 3:18 PM CDT	Special Weather Statement	TOP	Ottawa	12 min
May 2, 3:34 PM CDT	Special Weather Statement	TOP	Ottawa	11 min
May 2, 3:41 PM CDT	Severe Thunderstorm Warning	TOP	Ottawa	64 min
May 2, 3:52 PM CDT	Tornado Warning	TOP	Ottawa	38 min
May 2, 4:08 PM CDT	Severe Thunderstorm Warning	TOP	Cloud	52 min
May 2, 4:11 PM CDT	Tornado Warning	TOP	Cloud	49 min
May 2, 4:13 PM CDT	Tornado Warning	TOP	Ottawa	47 min
May 2, 4:21 PM CDT	Tornado Warning	TOP	Ottawa	39 min
May 2, 4:29 PM CDT	Tornado Warning	TOP	Clay, Cloud, Washington	46 min
May 2, 4:34 PM CDT	Areal Flood Advisory	TOP	Cloud, Ottawa	3 hr
May 2, 4:40 PM CDT	Severe Thunderstorm Warning	TOP	Clay, Dickinson, Ottawa	65 min
May 2, 4:47 PM CDT	Special Weather Statement	TOP	Dickinson	43 min
May 2, 4:48 PM CDT	Severe Thunderstorm Warning	TOP	Clay	57 min
May 2, 4:58 PM CDT	Tornado Warning	TOP	Clay, Marshall, Riley, Washington	47 min
May 2, 5:08 PM CDT	Severe Thunderstorm Warning	TOP	Geary, Pottawatomie, Riley	67 min
May 2, 5:22 PM CDT	Special Weather Statement	TOP	Geary, Morris	53 min
May 2, 5:34 PM CDT	Tornado Warning	TOP	Marshall, Pottawatomie, Riley	41 min
May 2, 6:03 PM CDT	Severe Thunderstorm Warning	TOP	Brown, Jackson, Marshall, Nemaha, Pottawatomie	57 min
May 2, 6:08 PM CDT	Special Weather Statement	TOP	Shawnee, Wabaunsee	52 min
May 2, 6:41 PM CDT	Severe Thunderstorm Warning	TOP	Brown, Jackson, Jefferson	64 min
May 2, 6:45 PM CDT	Special Weather Statement	TOP	Morris	30 min

Nearby

Flash Flood Watches in Kansas, 2018 Every flash flood watch in 2018

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.