Alert archive / Minnesota / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 96, NWS Twin Cities, MN

August 24, 2014Isanti County, Mille Lacs County, Sherburne County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 24, 2014, 7:29 PM CDT for Isanti County, Mille Lacs County, Sherburne County, Minnesota. It was in force for 46 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 24, 2014, 7:29 PM CDT (00:29 UTC)
Expired: Aug 24, 2014, 8:15 PM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Isanti County, MN, Mille Lacs County, MN, Sherburne County, MN

The radar

The Minneapolis radar (KMPX), 88 km from the middle of the area, began a volume at 00:31 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.

Issued	Product	Office	Lasted
Aug 24, 3:45 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.5 hours before the alert went out and 89 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2425 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 1141 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 234 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 14.7

Open this sounding in Storm Lab

The text

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

940 
WUUS53 KMPX 250029
SVRMPX
MNC059-095-141-250115-
/O.NEW.KMPX.SV.W.0096.140825T0029Z-140825T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
729 PM CDT SUN AUG 24 2014

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN ISANTI COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTH CENTRAL MILLE LACS COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHEASTERN SHERBURNE COUNTY IN CENTRAL MINNESOTA...

* UNTIL 815 PM CDT

* AT 728 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR PRINCETON...
  AND MOVING NORTHEAST AT 25 MPH.

  HAZARD...QUARTER SIZE HAIL.

  SOURCE...RADAR INDICATED.

  IMPACT...DAMAGE TO VEHICLES IS EXPECTED.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PRINCETON AROUND 735 PM CDT.

OTHER LOCATIONS IN THE WARNING INCLUDE DALBO AND BRAHAM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT
IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE
TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT
OR SMALL INTERIOR ROOM.

PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND
LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM
WINDOWS.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS!

&&

LAT...LON 4571 9315 4571 9314 4560 9314 4541 9356
      4545 9365 4558 9373 4574 9350 4573 9315
TIME...MOT...LOC 0029Z 221DEG 24KT 4552 9356

HAIL...1.00IN
WIND...<50MPH

$$

JC

2 follow-up statements

031 
WWUS53 KMPX 250047
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
747 PM CDT SUN AUG 24 2014

MNC095-141-250056-
/O.CAN.KMPX.SV.W.0096.000000T0000Z-140825T0115Z/
MILLE LACS MN-SHERBURNE MN-
747 PM CDT SUN AUG 24 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SHERBURNE AND
SOUTH CENTRAL MILLE LACS COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREAS OF SHERBURNE AND MILLE LACS COUNTIES...AND NO LONGER POSES AN 
IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT.

LAT...LON 4571 9315 4571 9314 4560 9314 4552 9351
      4573 9352 4573 9351 4573 9331 4573 9315
TIME...MOT...LOC 0046Z 223DEG 24KT 4562 9344

$$

MNC059-250115-
/O.CON.KMPX.SV.W.0096.000000T0000Z-140825T0115Z/
ISANTI MN-
747 PM CDT SUN AUG 24 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
ISANTI COUNTY UNTIL 815 PM CDT...

AT 744 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED 7 MILES EAST OF
PRINCETON...AND MOVING NORTHEAST AT 30 MPH.

HAZARD...QUARTER SIZE HAIL.

SOURCE...RADAR INDICATED.

IMPACT...DAMAGE TO VEHICLES IS EXPECTED.

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF NORTHERN
ISANTI COUNTY...INCLUDING THE FOLLOWING LOCATIONS...DALBO AND BRAHAM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT
IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE
TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT
OR SMALL INTERIOR ROOM.

PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND
LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM
WINDOWS.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS!

&&

LAT...LON 4571 9315 4571 9314 4560 9314 4552 9351
      4573 9352 4573 9351 4573 9331 4573 9315
TIME...MOT...LOC 0046Z 223DEG 24KT 4562 9344

HAIL...1.00IN
WIND...<50MPH

$$

JC

282 
WWUS53 KMPX 250107
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
807 PM CDT SUN AUG 24 2014

MNC059-250117-
/O.EXP.KMPX.SV.W.0096.000000T0000Z-140825T0115Z/
ISANTI MN-
807 PM CDT SUN AUG 24 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN ISANTI COUNTY WILL
EXPIRE AT 815 PM CDT...

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

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A TORNADO 
WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN THE TWIN CITIES.

LAT...LON 4571 9315 4571 9314 4560 9314 4552 9351
      4573 9352 4573 9351 4573 9331 4573 9315
TIME...MOT...LOC 0107Z 223DEG 24KT 4572 9330

$$

JC

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 24, 7:12 PM CDT	Special Weather Statement	MPX	Anoka	48 min
Aug 24, 7:21 PM CDT	Tornado Warning	MPX	Mille Lacs	24 min
Aug 24, 8:00 PM CDT	Special Weather Statement	MPX	Kanabec	30 min
Aug 24, 8:30 PM CDT	Special Weather Statement	MPX	Anoka	45 min
Aug 24, 9:12 PM CDT	Special Weather Statement	MPX	Chisago	48 min
Aug 24, 9:30 PM CDT	Special Weather Statement	MPX	Anoka	30 min
Aug 24, 9:47 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Washington	43 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2014 Every severe thunderstorm warning in 2014

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.