Alert archive / North Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 42, NWS Grand Forks, ND

July 2, 2012Cavalier County, Pembina County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 2, 2012, 12:29 PM CDT for Cavalier County, Pembina County, North Dakota. It was in force for 31 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
Jul 2, 2012, 12:29 PM CDT (17:29 UTC)
Expired
Jul 2, 2012, 1:00 PM CDT
In force
31 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Cavalier County, ND, Pembina County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 159 km from the middle of the area, began a volume at 17:30 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 2, 11:43 AM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 5.5 hours before the alert went out and 318 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, International Fa, MN at 12:00Z on 2012-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3219 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, International Fa, MN at 12:00Z on 2012-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
3219 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
897 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
88 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.5

Open this sounding in Storm Lab

The text

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

165 
WUUS53 KFGF 021729
SVRFGF
NDC019-067-021800-
/O.NEW.KFGF.SV.W.0042.120702T1729Z-120702T1800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1229 PM CDT MON JUL 2 2012

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CAVALIER COUNTY IN NORTHEAST NORTH DAKOTA...
  NORTHERN PEMBINA COUNTY IN NORTHEAST NORTH DAKOTA...

* UNTIL 100 PM CDT

* AT 1225 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THE
  STORM WAS LOCATED 3 MILES WEST OF WALHALLA...OR 21 MILES NORTHEAST
  OF LANGDON...MOVING TO THE NORTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  LEROY AROUND 1240 PM CDT.
  NECHE AROUND 100 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4899 9729 4891 9728 4883 9804 4900 9812
TIME...MOT...LOC 1729Z 253DEG 31KT 4894 9793
WIND...HAIL <50MPH 1.00IN

$$

VG
2 follow-up statements
381 
WWUS53 KFGF 021747
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1247 PM CDT MON JUL 2 2012

NDC019-021757-
/O.CAN.KFGF.SV.W.0042.000000T0000Z-120702T1800Z/
CAVALIER ND-
1247 PM CDT MON JUL 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CAVALIER COUNTY
IN NORTHEAST NORTH DAKOTA IS CANCELLED...

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

LAT...LON 4899 9793 4899 9729 4891 9728 4884 9793
TIME...MOT...LOC 1747Z 253DEG 31KT 4898 9778

$$

NDC067-021800-
/O.CON.KFGF.SV.W.0042.000000T0000Z-120702T1800Z/
PEMBINA ND-
1247 PM CDT MON JUL 2 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
PEMBINA COUNTY IN NORTHEAST NORTH DAKOTA UNTIL 100 PM CDT...

AT 1244 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THE
STORM WAS LOCATED 4 MILES NORTHWEST OF LEROY...OR 29 MILES NORTHEAST
OF LANGDON...MOVING TO THE EAST AT 35 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  NECHE AROUND 100 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4899 9793 4899 9729 4891 9728 4884 9793
TIME...MOT...LOC 1747Z 253DEG 31KT 4898 9778
WIND...HAIL <50MPH 1.00IN

$$

VG
746 
WWUS53 KFGF 021757
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1257 PM CDT MON JUL 2 2012

NDC067-021807-
/O.EXP.KFGF.SV.W.0042.000000T0000Z-120702T1800Z/
PEMBINA ND-
1257 PM CDT MON JUL 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN PEMBINA COUNTY IN
NORTHEAST NORTH DAKOTA HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

LAT...LON 4899 9793 4899 9729 4891 9728 4884 9793
TIME...MOT...LOC 1757Z 253DEG 31KT 4900 9765

$$

VG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 2, 4:15 AM CDTHeat AdvisoryFGFBarnes, Cass, Grand Forks, Pembina, Ransom, Richland and 4 more15 hr
Jul 2, 10:54 AM CDTSpecial Weather StatementFGFTowner51 min
Jul 2, 10:57 AM CDTSevere Thunderstorm WarningFGFCavalier, Towner32 min
Jul 2, 12:12 PM CDTSpecial Weather StatementFGFPembina48 min
Jul 2, 1:23 PM CDTSpecial Weather StatementFGFPembina37 min
Jul 2, 1:40 PM CDTSevere Thunderstorm WarningFGFPembina37 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.