Alert archive / North Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 166, NWS Grand Forks, ND

August 23, 2011Ransom County, Richland County, Sargent County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 23, 2011, 12:44 AM CDT for Ransom County, Richland County, Sargent County, North Dakota. It was in force for 35 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 23, 2011, 12:44 AM CDT (05:44 UTC)
Expired
Aug 23, 2011, 1:19 AM CDT
In force
35 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Ransom County, ND, Richland County, ND, Sargent County, ND

The radar

The Aberdeen radar (KABR), 122 km from the middle of the area, began a volume at 05:46 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

Aberdeen, SD (KABR), launched 00:00Z, 5.7 hours before the alert went out and 174 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, Aberdeen, SD at 00:00Z on 2011-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2620 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 2011-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 square meters per square second.19395878Sfc1 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
2620 J/kg
Mixed-layer CIN
-134 J/kg
Mixed-layer LCL
1327 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.8

Open this sounding in Storm Lab

The text

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

746 
WUUS53 KFGF 230544
SVRFGF
NDC073-077-081-230630-
/O.NEW.KFGF.SV.W.0166.110823T0544Z-110823T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1244 AM CDT TUE AUG 23 2011

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN RANSOM COUNTY IN SOUTHEAST NORTH DAKOTA...
  WESTERN RICHLAND COUNTY IN SOUTHEAST NORTH DAKOTA...
  NORTHERN SARGENT COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 130 AM CDT

* AT 1239 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH. THE STORM WAS LOCATED 8 MILES SOUTH OF VENLO...OR 43
  MILES WEST OF WAHPETON...MOVING TO THE EAST AT 40 MPH. ALSO PENNY
  SIZE HAIL MAY ACCOMPANY THE DAMAGING WINDS.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MCLEOD AND DE LAMERE AROUND 1255 AM CDT.
  HAMLIN...GENESEO AND BARRIE AROUND 100 AM CDT.
  WYNDMERE AROUND 105 AM CDT.
  LIDGERWOOD AROUND 110 AM CDT.

THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM
INCLUDE WALCOTT...MANTADOR AND CHRISTINE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF SEVERE WEATHER IS OBSERVED CONTACT YOUR LOCAL LAW ENFORCEMENT AND
ASK THEM TO RELAY YOUR INFORMATION TO THE NATIONAL WEATHER SERVICE IN
GRAND FORKS.

&&

LAT...LON 4617 9786 4662 9766 4659 9677 4600 9698
TIME...MOT...LOC 0542Z 280DEG 35KT 4637 9746
WIND...HAIL 60MPH 0.75IN

$$

JR
1 follow-up statement
993 
WWUS53 KFGF 230619
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
119 AM CDT TUE AUG 23 2011

NDC073-077-081-230628-
/O.CAN.KFGF.SV.W.0166.000000T0000Z-110823T0630Z/
RANSOM ND-SARGENT ND-RICHLAND ND-
119 AM CDT TUE AUG 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN RICHLAND...NORTHERN
SARGENT AND EASTERN RANSOM COUNTIES IN SOUTHEAST NORTH DAKOTA IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.  HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL
POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4617 9786 4662 9766 4659 9677 4600 9698
TIME...MOT...LOC 0618Z 280DEG 35KT 4630 9696

$$

JR

Nearby

Severe Thunderstorm Warnings in North Dakota, 2011Every severe thunderstorm warning 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.