Alert archive / North Dakota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 3, NWS Grand Forks, ND

May 1, 2012Pembina County, Walsh County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at May 1, 2012, 5:55 PM CDT for Pembina County, Walsh County, North Dakota. It was in force for 65 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
May 1, 2012, 5:55 PM CDT (22:55 UTC)
Expired
May 1, 2012, 7:00 PM CDT
In force
65 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Pembina County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 125 km from the middle of the area, began a volume at 22:59 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
May 1, 6:25 PM CDTHAIL 16 Ese Crystal, NDVERY HEAVY RAINS AND LOTS OF DIME TO QUARTER SIZED HAIL FELL OVER A FIVE MINUTE PERIOD... UNTIL ABOUT 630 PM CDT.

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

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 10.9 hours before the alert went out and 306 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 2012-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2012-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1266 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
147 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

075 
WUUS53 KFGF 012255
SVRFGF
NDC067-099-020000-
/O.NEW.KFGF.SV.W.0003.120501T2255Z-120502T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
555 PM CDT TUE MAY 1 2012

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN PEMBINA COUNTY IN NORTHEAST NORTH DAKOTA...
  NORTHEASTERN WALSH COUNTY IN NORTHEAST NORTH DAKOTA...

* UNTIL 700 PM CDT

* AT 554 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THE
  STORM WAS LOCATED 5 MILES SOUTHEAST OF GARDAR...OR 20 MILES
  NORTHWEST OF GRAFTON...MOVING TO THE EAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HOOPLE AND CRYSTAL AROUND 600 PM CDT.
  ST. THOMAS AROUND 625 PM CDT.
  GLASSTON AROUND 630 PM CDT.
  DRAYTON AROUND 650 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4878 9721 4853 9717 4850 9784 4863 9789
TIME...MOT...LOC 2255Z 257DEG 22KT 4857 9772
WIND...HAIL <50MPH 1.00IN

$$

HOPPES
2 follow-up statements
876 
WWUS53 KFGF 012318
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
618 PM CDT TUE MAY 1 2012

NDC067-099-020000-
/O.CON.KFGF.SV.W.0003.000000T0000Z-120502T0000Z/
PEMBINA ND-WALSH ND-
618 PM CDT TUE MAY 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
WALSH AND SOUTHERN PEMBINA COUNTIES IN NORTHEAST NORTH DAKOTA UNTIL
700 PM CDT...

AT 616 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THE
STORM WAS LOCATED 4 MILES NORTHEAST OF HOOPLE...OR 13 MILES NORTHWEST
OF GRAFTON...MOVING TO THE EAST AT 25 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  ST. THOMAS AROUND 625 PM CDT.
  GLASSTON AROUND 630 PM CDT.
  DRAYTON AROUND 655 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4878 9721 4853 9717 4850 9784 4863 9789
TIME...MOT...LOC 2317Z 257DEG 22KT 4857 9752

$$

HOPPES
886 
WWUS53 KFGF 012356
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
656 PM CDT TUE MAY 1 2012

NDC067-099-020006-
/O.EXP.KFGF.SV.W.0003.000000T0000Z-120502T0000Z/
PEMBINA ND-WALSH ND-
656 PM CDT TUE MAY 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WALSH AND
SOUTHERN PEMBINA COUNTIES IN NORTHEAST NORTH DAKOTA WILL EXPIRE AT
700 PM CDT...

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

LAT...LON 4878 9721 4853 9717 4850 9784 4863 9789
TIME...MOT...LOC 2356Z 257DEG 22KT 4858 9718

$$

HOPPES

The office that day

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

IssuedProductOfficeCountiesLasted
May 1, 2:13 PM CDTSevere Thunderstorm WarningFGFCavalier32 min
May 1, 5:04 PM CDTSevere Thunderstorm WarningFGFBenson, Nelson, Ramsey56 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.