Alert archive / North Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 2039

August 22, 201115 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2011, 7:35 PM CDT for 15 counties in North Dakota. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued
Aug 22, 2011, 7:35 PM CDT (00:35 UTC)
Expired
Aug 22, 2011, 9:00 PM CDT
In force
85 min
Issued by
the Storm Prediction Center

Counties Barnes County, ND, Cass County, ND, Dickey County, ND, Eddy County, ND, Foster County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, Ransom County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Wells County, ND

The radar

The Bismarck radar (KBIS), 130 km from the middle of the area, began a volume at 00:37 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.6 hours before the alert went out and 125 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 00:00Z on 2011-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2669 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 00:00Z on 2011-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 177 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
2669 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
2074 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
177 m²/s²
0-3 km storm-relative helicity
251 m²/s²
Significant tornado parameter
0.0
Supercell composite
10.5

Open this sounding in Storm Lab

The text

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

636 
ACUS11 KWNS 230036
SWOMCD
SPC MCD 230035
MNZ000-NDZ000-SDZ000-230200-

MESOSCALE DISCUSSION 2039
NWS STORM PREDICTION CENTER NORMAN OK
0735 PM CDT MON AUG 22 2011

AREAS AFFECTED...SERN ND

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 230035Z - 230200Z

LATEST WV IMAGERY DEPICTS A WELL DEFINED MID LEVEL VORT/SHORTWAVE
TROUGH DIGGING ESEWD ACROSS ND AT ROUGHLY 30-35KT.  WEAK CONVECTION
HAS BEEN NOTED WITH THIS FEATURE AND DEEPER UPDRAFTS WITH A FEW
LIGHTNING STRIKES HAVE RECENTLY BEEN OBSERVED NEAR BIS ALONG LEADING
EDGE OF STRONGER FORCING.  00Z SOUNDING FROM BIS EXHIBITS A FAIRLY
MOIST/BUOYANT PROFILE WITH MLCAPE AROUND 2900 J/KG AND SUFFICIENT
DEEP LAYER SHEAR FOR WEAK STORM ROTATION IF UPDRAFTS CAN ROOT
THEMSELVES WITHIN FAVORABLE BOUNDARY LAYER.  IT/S NOT COMPLETELY
CLEAR HOW CONCENTRATED THIS ACTIVITY WILL BECOME THOUGH
ENVIRONMENTAL CONDITIONS DO WARRANT SOME CONSIDERATION FOR A SEVERE
THUNDERSTORM WATCH IF TSTMS CONTINUE TO INCREASE IN AREAL
COVERAGE/INTENSITY.

..DARROW.. 08/23/2011

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

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

LAT...LON   46380053 48019993 47449675 45869755 46380053

Nearby

Mesoscale Discussions in North Dakota, 2011Every mesoscale discussion 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.