Alert archive / North Dakota / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 4, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at May 10, 2011, 2:25 AM CDT for Cass County, North Dakota. It was in force for 48 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
- May 10, 2011, 2:25 AM CDT (07:25 UTC)
- Expired
- May 10, 2011, 3:13 AM CDT
- In force
- 48 min
- Issued by
- NWS Grand Forks, ND
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Cass County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 60 km from the middle of the area, began a volume at 07:25 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, 7.4 hours before the alert went out and 247 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.
- Mixed-layer CAPE
- 706 J/kg
- Mixed-layer CIN
- -236 J/kg
- Mixed-layer LCL
- 724 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
920 WUUS53 KFGF 100725 SVRFGF NDC017-100830- /O.NEW.KFGF.SV.W.0004.110510T0725Z-110510T0830Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 225 AM CDT TUE MAY 10 2011 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL CASS COUNTY IN SOUTHEAST NORTH DAKOTA... * UNTIL 330 AM CDT * AT 220 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS LOCATED 7 MILES NORTHEAST OF SHELDON...OR 31 MILES SOUTHWEST OF FARGO...MOVING TO THE NORTH AT 30 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... EMBDEN AND CHAFFEE AROUND 240 AM CDT. CASSELTON AND WHEATLAND AROUND 300 AM CDT. ABSARAKA AROUND 305 AM CDT. AMENIA AROUND 315 AM CDT. THEREAFTER SOME OTHER LOCATIONS IMPACTED BY THE SEVERE THUNDERSTORM INCLUDE ERIE AND HUNTER. FOR MOTORISTS ON INTERSTATE 94...THE SEVERE THUNDERSTORM WILL BE BETWEEN...MILE MARKER 319 AROUND 250 AM CDT...AND MILE MARKER 334 AROUND 300 AM CDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. && LAT...LON 4725 9737 4718 9699 4664 9728 4664 9755 TIME...MOT...LOC 0725Z 194DEG 24KT 4669 9738 WIND...HAIL 60MPH 1.00IN $$ EWENS
2 follow-up statements
009 WWUS53 KFGF 100757 SVSFGF SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 257 AM CDT TUE MAY 10 2011 NDC017-100830- /O.CON.KFGF.SV.W.0004.000000T0000Z-110510T0830Z/ CASS ND- 257 AM CDT TUE MAY 10 2011 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL CASS COUNTY IN SOUTHEAST NORTH DAKOTA UNTIL 330 AM CDT... AT 253 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS LOCATED 3 MILES SOUTHEAST OF WHEATLAND...OR 23 MILES WEST OF FARGO...MOVING TO THE NORTH AT 30 MPH. THIS STORM HAD WEAKENED BUT WAS STILL CAPABLE OF PRODUCING LARGE HAIL. THE SEVERE THUNDERSTORM WILL BE NEAR... ABSARAKA AROUND 305 AM CDT. AMENIA AROUND 315 AM CDT. ERIE AND ARTHUR AROUND 325 AM CDT. HUNTER AROUND 330 AM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. && LAT...LON 4725 9737 4718 9699 4664 9728 4664 9755 TIME...MOT...LOC 0757Z 194DEG 24KT 4690 9730 $$ EWENS
185 WWUS53 KFGF 100813 SVSFGF SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 313 AM CDT TUE MAY 10 2011 NDC017-100823- /O.CAN.KFGF.SV.W.0004.000000T0000Z-110510T0830Z/ CASS ND- 313 AM CDT TUE MAY 10 2011 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CASS COUNTY IN SOUTHEAST NORTH DAKOTA IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY. LAT...LON 4725 9737 4718 9699 4664 9728 4664 9755 TIME...MOT...LOC 0813Z 194DEG 24KT 4700 9726 $$ EWENS
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 12:01 AM CDT | Severe Thunderstorm Warning | FGF | Ransom, Sargent | 44 min |
| May 10, 12:44 AM CDT | Severe Thunderstorm Warning | FGF | Ransom, Sargent | 61 min |
| May 10, 2:43 AM CDT | Severe Thunderstorm Warning | FGF | Cass | 62 min |
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.