Alert archive / North Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 39, NWS Grand Forks, ND

June 30, 2012Griggs County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 30, 2012, 8:52 PM CDT for Griggs County, North Dakota. It was in force for 40 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jun 30, 2012, 8:52 PM CDT (01:52 UTC)
Expired
Jun 30, 2012, 9:32 PM CDT
In force
40 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Hail
1.5 in
Wind
50.0 mph

County Griggs County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 73 km from the middle of the area, began a volume at 01:55 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.

What was reported inside it

TimeReportWhereRemark
Jun 30, 9:15 PM CDTHAIL 112 Sw Cooperstown, NDAT LEAST QUARTER SIZE HAIL FELL

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.9 hours before the alert went out and 196 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 2012-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1260 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 2012-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 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
1260 J/kg
Mixed-layer CIN
-70 J/kg
Mixed-layer LCL
1979 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.7

Open this sounding in Storm Lab

The text

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

265 
WUUS53 KFGF 010152
SVRFGF
NDC039-010245-
/O.NEW.KFGF.SV.W.0039.120701T0152Z-120701T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
852 PM CDT SAT JUN 30 2012

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN GRIGGS COUNTY IN SOUTHEAST NORTH DAKOTA...

* UNTIL 945 PM CDT

* AT 851 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL.
  THE STORM WAS LOCATED 4 MILES WEST OF REVERE...OR 35 MILES
  NORTHWEST OF VALLEY CITY...MOVING TO THE EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  WALUM AND HANNAFORD AROUND 905 PM CDT.
  COOPERSTOWN AROUND 910 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

&&

LAT...LON 4752 9801 4725 9800 4725 9846 4733 9846
      4733 9850 4745 9849
TIME...MOT...LOC 0152Z 259DEG 38KT 4735 9840
WIND...HAIL <50MPH 1.50IN

$$
DK
2 follow-up statements
828 
WWUS53 KFGF 010202
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
902 PM CDT SAT JUN 30 2012

NDC039-010245-
/O.CON.KFGF.SV.W.0039.000000T0000Z-120701T0245Z/
GRIGGS ND-
902 PM CDT SAT JUN 30 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
GRIGGS COUNTY IN SOUTHEAST NORTH DAKOTA UNTIL 945 PM CDT...

AT 900 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING PING PONG BALL SIZE HAIL...
AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THE STORM WAS LOCATED OVER
REVERE...OR 33 MILES NORTHWEST OF VALLEY CITY...MOVING TO THE EAST AT
45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  COOPERSTOWN AROUND 915 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

&&

LAT...LON 4752 9801 4725 9800 4725 9846 4733 9846
      4733 9850 4745 9849
TIME...MOT...LOC 0202Z 259DEG 38KT 4736 9829
WIND...HAIL 60MPH 1.50IN

$$
DK
936 
WWUS53 KFGF 010232
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
932 PM CDT SAT JUN 30 2012

NDC039-010242-
/O.CAN.KFGF.SV.W.0039.000000T0000Z-120701T0245Z/
GRIGGS ND-
932 PM CDT SAT JUN 30 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN GRIGGS COUNTY IN
SOUTHEAST NORTH DAKOTA IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

LAT...LON 4752 9801 4725 9800 4725 9846 4733 9846
      4733 9850 4745 9849
TIME...MOT...LOC 0232Z 259DEG 38KT 4742 9783

$$

DK

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 30, 8:24 PM CDTSpecial Weather StatementFGFBarnes66 min
Jun 30, 9:20 PM CDTSevere Thunderstorm WarningFGFGriggs, Steele32 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2012Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.