Alert archive / North Dakota / Mesoscale Discussions in 2005

Mesoscale Discussion 1921

August 2, 20058 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2005, 6:55 PM CDT for 8 counties in North Dakota. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Aug 2, 2005, 6:55 PM CDT (23:55 UTC)
Expired
Aug 2, 2005, 8:30 PM CDT
In force
95 min
Issued by
the Storm Prediction Center

Counties Benson County, ND, Eddy County, ND, Foster County, ND, Pierce County, ND, Ramsey County, ND, Rolette County, ND, Towner County, ND, Wells County, ND

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 11.9 hours before the alert went out and 145 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 2005-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1753 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 2005-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 214 square meters per square second.1939Sfc1 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
1753 J/kg
Mixed-layer CIN
-277 J/kg
Mixed-layer LCL
861 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
214 m²/s²
0-3 km storm-relative helicity
222 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
ACUS11 KWNS 022355
SWOMCD
SPC MCD 022355 
NDZ000-030130-

MESOSCALE DISCUSSION 1921
NWS STORM PREDICTION CENTER NORMAN OK
0655 PM CDT TUE AUG 02 2005

AREAS AFFECTED...N CENTRAL ND

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 022355Z - 030130Z

ISOLATED LARGE HAIL/DAMAGING WINDS WILL BE POSSIBLE WITH SWD
DEVELOPING STORMS ACROSS N CENTRAL ND. A WW MAY BECOME NECESSARY IN
THE NEXT HOUR OR SO.

AN ISOLATED CLUSTER OF STRONG/SEVERE STORMS HAS DEVELOPED JUST N OF
A SURFACE TRIPLE POINT ACROSS BOTTINEAU/MCHENRY COUNTIES.  SWD
DEVELOPMENT OF CONVECTION APPEARS POSSIBLE WITH THE TRIPLE POINT
OVER THE NEXT FEW HOURS AS CONVECTIVE INHIBITION HAS BEEN ACROSS
WEAKENED THIS AREA BY DAYTIME HEATING AND MESOSCALE ASCENT ALONG THE
BOUNDARIES.  STRONG INSTABILITY /MLCAPE VALUES IN EXCESS OF 3000
J/KG/ IS PRESENT NEAR AND E OF THE ONGOING STORMS...WHILE DEEP LAYER
SHEAR IS MARGINALLY FAVORABLE FOR ORGANIZED SEVERE STORMS.  PRESENT
INDICATIONS ARE THAT A SEVERE THUNDERSTORM WATCH MAY BECOME
NECESSARY BY ROUGHLY 01Z ACROSS CENTRAL/N CENTRAL ND.

..THOMPSON.. 08/02/2005

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FGF...BIS...

46969972 47220014 48260060 48750078 49010063 49019869
47979848 47479875 47099913

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 2, 5:18 PM CDTMesoscale DiscussionSPCBarnes, Cass, Cavalier, Grand Forks, Griggs, Nelson and 5 more117 min

Nearby

Mesoscale Discussions in North Dakota, 2005Every mesoscale discussion in 2005

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.