Alert archive / North Dakota / Special Weather Statements in 2017

Special Weather Statement, NWS Bismarck, ND

August 12, 2017Morton County, North Dakota

NWS Bismarck, ND issued this special weather statement at Aug 12, 2017, 7:39 PM CDT for Morton County, North Dakota. It was in force for 36 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 12, 2017, 7:39 PM CDT (00:39 UTC)
Expired: Aug 12, 2017, 8:15 PM CDT
In force: 36 min
Issued by: NWS Bismarck, ND

County Morton County, ND

The radar

The Bismarck radar (KBIS), 46 km from the middle of the area, began a volume at 00:43 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.7 hours before the alert went out and 50 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: 257 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 978 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

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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 Bismarck, ND wrote its last area forecast discussion before this special weather statement went out at Aug 12, 7:16 PM CDT, 23 minutes earlier.

Area forecast discussion, Aug 12, 7:16 PM CDT, 23 minutes before

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Hazardous weather outlook, Aug 12, 7:24 PM CDT, 15 minutes before

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In the hours before

Local storm report, Aug 12, 5:38 PM CDT, 2 hours 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
538 PM CDT SAT AUG 12 2017

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

0515 PM     HEAVY RAIN       ELLENDALE               46.00N 98.53W
08/12/2017  M1.50 INCH       DICKEY             ND   EMERGENCY MNGR

&&

Local storm report, Aug 12, 6:09 PM CDT, 1 hour 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
609 PM CDT SAT AUG 12 2017

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

0608 PM     HAIL             SAINT GERTRUDE          46.29N 101.33W
08/12/2017  M2.75 INCH       GRANT              ND   TRAINED SPOTTER

            BASEBALL SIZED HAIL BOUNCING 5 FEET OFF THE
            AROUND. DENTS IN HIS VEHICLE.

&&

KS

Local storm report, Aug 12, 6:21 PM CDT, 1 hour 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
621 PM CDT SAT AUG 12 2017

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

0600 PM     HAIL             11 W SCHEFIELD          46.69N 103.09W
08/12/2017  E2.75 INCH       STARK              ND   TRAINED SPOTTER

            EST. 40 MPH WINDS.

&&

Local storm report, Aug 12, 7:20 PM CDT, 19 minutes before

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Local storm report, Aug 12, 7:26 PM CDT, 13 minutes before

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Special weather statement, Aug 12, 7:39 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 7:15 PM CDT	Severe Thunderstorm Warning	BIS	Adams	41 min
Aug 12, 8:03 PM CDT	Special Weather Statement	BIS	Morton	42 min
Aug 12, 8:09 PM CDT	Special Weather Statement	BIS	Adams	51 min
Aug 12, 8:28 PM CDT	Special Weather Statement	BIS	Kidder	47 min
Aug 12, 10:05 PM CDT	Special Weather Statement	BIS	Sioux	25 min

Nearby

Special Weather Statements in North Dakota, 2017 Every special weather statement in 2017

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.