Alert archive / North Dakota / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 240, NWS Bismarck, ND

September 20, 2019Morton County, Sioux County, North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Sep 20, 2019, 6:33 PM CDT for Morton County, Sioux County, North Dakota. It was in force for 42 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
Sep 20, 2019, 6:33 PM CDT (23:33 UTC)
Expired
Sep 20, 2019, 7:15 PM CDT
In force
42 min
Issued by
NWS Bismarck, ND
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Morton County, ND, Sioux County, ND

The radar

The Bismarck radar (KBIS), 50 km from the middle of the area, began a volume at 23:36 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Sep 20, 1:50 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 11.6 hours before the alert went out and 53 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-pSkew-T log-p diagram, Bismarck Municip, ND at 12:00Z on 2019-09-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1602 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 12:00Z on 2019-09-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 186 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1602 J/kg
Mixed-layer CIN
-322 J/kg
Mixed-layer LCL
1356 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
186 m²/s²
0-3 km storm-relative helicity
128 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 Bismarck, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 20, 5:47 PM CDT, 46 minutes earlier.

Area forecast discussion, Sep 20, 5:47 PM CDT, 46 minutes before
Area Forecast Discussion
National Weather Service Bismarck ND
547 PM CDT Fri Sep 20 2019

.UPDATE...
Issued at 547 PM CDT Fri Sep 20 2019

Cold front located from just west of Minot south to Glen Ullin.
Severe discrete storms continue merge together into a cluster
along and ahead of the front. No change to the current forecast or
the ongoing severe thunderstorm watch which continues until 10 PM
CDT for most of central ND. More thunderstorms will move from
South Dakota north this evening through tonight. These storms will
be more attached with the upper level low and stronger forced
ascent that is progged to approach later tonight through Saturday.

UPDATE Issued at 419 PM CDT Fri Sep 20 2019

Quick update for thunderstorms forming in south central North
Dakota.

&&

.SHORT TERM...(This evening through Saturday)
Issued at 203 PM CDT Fri Sep 20 2019

Severe thunderstorm watch 654 has been issued for central North
Dakota this afternoon and evening.

Organized line of thunderstorms has formed along the cold front
similar to CAM model forecast. The HREF ensemble depicts some
short to medium length supercells tracking northeast along the
front and nothing has changed to the anticipated scenario and
storm mode, with a linear MCS expected to form and track across
central into eastern North Dakota through this evening.

A secondary thrust of severe weather may be possible across
southwest and south central North Dakota late this evening and
overnight as the CAM models now suggest.

Saturday will see widespread showers and and scattered
thunderstorms as the main upper low tracks into the region.

In addition to the severe weather, heavy rains will be a concern,
although current indications are the rainfall will not completely
overlap the september rains from last 2 weeks.

.LONG TERM...(Saturday night through Friday)
Issued at 203 PM CDT Fri Sep 20 2019

After this rain event, mainly dry weather is forecast through
Tuesday, with scattered showers Wednesday through Friday.  Much
cooler weather Wednesday through Friday.

&&

.AVIATION...(For the 00Z TAFS through 00Z Saturday evening)
Issued at 547 PM CDT Fri Sep 20 2019

Showers and scattered thunderstorms, some severe with large hail
and damaging winds continue to be a threat for KMOT/KBIS and KJMS
through 07z Saturday. Although scattered showers and thunderstorms
will slide into KDIK and KISN mainly after 06z, the severity will
be limited. MVFR to IFR cigs can be expected this taf period with
the precipitation.

&&

.BIS WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

UPDATE...KS
SHORT TERM...WAA
LONG TERM...WAA
AVIATION...KS
Hazardous weather outlook, Sep 20, 2:37 PM CDT, 3 hours 56 minutes before
Hazardous Weather Outlook
National Weather Service Bismarck ND
237 PM CDT Fri Sep 20 2019

NDZ003>005-011>013-019>023-025-034>037-042-045>047-050-211945-
Renville-Bottineau-Rolette-Ward-McHenry-Pierce-Mercer-Oliver-
McLean-Sheridan-Wells-Foster-Morton-Burleigh-Kidder-Stutsman-
Grant-Sioux-Emmons-Logan-McIntosh-
237 PM CDT Fri Sep 20 2019 /137 PM MDT Fri Sep 20 2019/

This Hazardous Weather Outlook is for portions of north central
North Dakota, south central North Dakota, and southeast North
Dakota.

.DAY ONE...This Afternoon and Tonight

Thunderstorms this afternoon and this evening. Some storms will
be severe with large hail to the size of golf balls and damaging
winds to 60 mph the main threats. An isolated tornado threat is
also possible late this afternoon and evening.

Additionally, heavy rainfall today and tonight may lead to
localized flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There is a chance of thunderstorms Saturday morning through
Saturday evening. Additional heavy rainfall may lead to localized
flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

NDZ001-002-009-010-017-018-031>033-040-041-043-044-048-051-211945-
Divide-Burke-Williams-Mountrail-McKenzie-Dunn-Golden Valley-
Billings-Stark-Slope-Hettinger-Bowman-Adams-La Moure-Dickey-
237 PM CDT Fri Sep 20 2019 /137 PM MDT Fri Sep 20 2019/

This Hazardous Weather Outlook is for portions of northwest North
Dakota, southeast North Dakota, and southwest North Dakota.

.DAY ONE...This Afternoon and Tonight

Thunderstorms are likely this afternoon west and tonight west and
central. Some storms may be strong to severe, with large hail to
the size of quarters and damaging winds to 60 mph the main
threats. An isolated tornado threat is also possible late this
afternoon and evening.

Additionally, heavy rainfall today and tonight may lead to
localized flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There is a chance of thunderstorms Saturday morning through
Saturday evening. Additional heavy rainfall may lead to localized
flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

In the hours before

Local storm report, Sep 20, 4:58 PM CDT, 1 hour 35 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
458 PM CDT FRI SEP 20 2019

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

0135 PM     HAIL             5 NE MAXBASS            48.78N 101.07W
09/20/2019  E1.00 INCH       BOTTINEAU          ND   PUBLIC

            NO DAMAGE REPORTED.

&&

KS
Local storm report, Sep 20, 5:23 PM CDT, 1 hour 10 minutes before
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Local storm report, Sep 20, 5:59 PM CDT, 34 minutes before
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Special weather statement, Sep 20, 6:01 PM CDT, 32 minutes before
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Local storm report, Sep 20, 6:13 PM CDT, 20 minutes before
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Local storm report, Sep 20, 6:17 PM CDT, 16 minutes before
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The office that day

Everything else NWS Bismarck, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 19, 11:06 PM CDTSpecial Weather StatementBISDivide24 min
Sep 19, 11:27 PM CDTSpecial Weather StatementBISDivide33 min
Sep 20, 12:12 AM CDTSpecial Weather StatementBISDivide33 min
Sep 20, 12:26 AM CDTSevere Thunderstorm WarningBISDivide40 min
Sep 20, 11:10 AM CDTSpecial Weather StatementBISMountrail20 min
Sep 20, 11:26 AM CDTSevere Thunderstorm WarningBISMcKenzie, Mountrail64 min
Sep 20, 12:18 PM CDTSevere Thunderstorm WarningBISMountrail, Ward43 min
Sep 20, 12:52 PM CDTSevere Thunderstorm WarningBISBottineau, Renville38 min
Sep 20, 1:23 PM CDTSevere Thunderstorm WarningBISBottineau43 min
Sep 20, 1:25 PM CDTSpecial Weather StatementBISMercer20 min
Sep 20, 1:58 PM CDTSevere Thunderstorm WarningBISMcLean, Ward62 min
Sep 20, 2:47 PM CDTSevere Thunderstorm WarningBISBottineau, McHenry, Renville, Ward43 min
Sep 20, 3:23 PM CDTSevere Thunderstorm WarningBISGrant, Morton, Sioux67 min
Sep 20, 3:27 PM CDTSevere Thunderstorm WarningBISBottineau63 min
Sep 20, 4:24 PM CDTSevere Thunderstorm WarningBISBurleigh66 min
Sep 20, 4:35 PM CDTSevere Thunderstorm WarningBISEmmons55 min
Sep 20, 4:45 PM CDTSevere Thunderstorm WarningBISBurleigh, Emmons, Morton, Sioux47 min
Sep 20, 5:07 PM CDTSevere Thunderstorm WarningBISSheridan52 min
Sep 20, 6:01 PM CDTSpecial Weather StatementBISKidder, Wells29 min
Sep 20, 6:10 PM CDTAreal Flood AdvisoryBISBurleigh, Kidder, Sheridan, Wells3 hr

Nearby

Severe Thunderstorm Warnings in North Dakota, 2019Every severe thunderstorm warning in 2019

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.