Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 119, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 4, 2018, 12:17 AM CDT for Chisago County, Washington County, Minnesota; Polk County, Wisconsin. It was in force for 28 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
- Aug 4, 2018, 12:17 AM CDT (05:17 UTC)
- Expired
- Aug 4, 2018, 12:45 AM CDT
- In force
- 28 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Chisago County, MN, Washington County, MN, Polk County, WI
The radar
The Minneapolis radar (KMPX), 83 km from the middle of the area, began a volume at 05:20 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 4, 12:22 AM CDT | HAIL 1 | Osceola, WI |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 5.3 hours before the alert went out and 85 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
- 3195 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 1086 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 164 m²/s²
- 0-3 km storm-relative helicity
- 230 m²/s²
- Significant tornado parameter
- 3.0
- Supercell composite
- 17.5
The text
As transmitted.
370 WUUS53 KMPX 040517 SVRMPX MNC025-163-WIC095-040545- /O.NEW.KMPX.SV.W.0119.180804T0517Z-180804T0545Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Twin Cities/Chanhassen MN 1217 AM CDT SAT AUG 4 2018 The National Weather Service in The Twin Cities has issued a * Severe Thunderstorm Warning for... Southeastern Chisago County in east central Minnesota... Northeastern Washington County in east central Minnesota... South central Polk County in northwestern Wisconsin... * Until 1245 AM CDT. * At 1217 AM CDT, a severe thunderstorm was located over East Farmington, or 29 miles north of River Falls, moving east at 25 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * Locations impacted include... Scandia, Osceola, St. Croix Falls, Dresser, Otisville, East Farmington, Osceola Airport, Nye and William OBrien State Park. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4521 9280 4530 9286 4542 9256 4523 9247 TIME...MOT...LOC 0517Z 250DEG 22KT 4527 9273 HAIL...1.00IN WIND...<50MPH $$ AMK
2 follow-up statements
167
WWUS53 KMPX 040532
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1232 AM CDT SAT AUG 4 2018
MNC025-163-040542-
/O.CAN.KMPX.SV.W.0119.000000T0000Z-180804T0545Z/
Chisago MN-Washington MN-
1232 AM CDT SAT AUG 4 2018
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHISAGO AND
NORTHEASTERN WASHINGTON COUNTIES IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4523 9265 4534 9269 4542 9256 4523 9247
TIME...MOT...LOC 0532Z 250DEG 22KT 4530 9260
$$
WIC095-040545-
/O.CON.KMPX.SV.W.0119.000000T0000Z-180804T0545Z/
Polk WI-
1232 AM CDT SAT AUG 4 2018
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR SOUTH CENTRAL POLK COUNTY...
At 1232 AM CDT, a severe thunderstorm was located over Nye, or 30
miles north of River Falls, moving east at 25 mph.
HAZARD...Half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
Locations impacted include...
Osceola, Dresser and Nye.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4523 9265 4534 9269 4542 9256 4523 9247
TIME...MOT...LOC 0532Z 250DEG 22KT 4530 9260
HAIL...1.25IN
WIND...<50MPH
$$
AMK226
WWUS53 KMPX 040544
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1244 AM CDT SAT AUG 4 2018
WIC095-040554-
/O.EXP.KMPX.SV.W.0119.000000T0000Z-180804T0545Z/
Polk WI-
1244 AM CDT SAT AUG 4 2018
...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL POLK COUNTY WILL
EXPIRE AT 1245 AM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However small hail
is still possible with this thunderstorm.
LAT...LON 4523 9265 4534 9269 4542 9256 4523 9247
TIME...MOT...LOC 0544Z 250DEG 22KT 4532 9251
$$
AMKThe office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 7:02 PM CDT | Severe Thunderstorm Warning | MPX | Stearns, Wright | 43 min |
| Aug 3, 7:33 PM CDT | Severe Thunderstorm Warning | MPX | Benton, Mille Lacs, Sherburne, Wright | 27 min |
| Aug 3, 7:41 PM CDT | Special Weather Statement | MPX | Renville | 49 min |
| Aug 3, 10:19 PM CDT | Flash Flood Warning | MPX | Benton, Sherburne, Stearns | 3 hr |
| Aug 4, 12:05 AM CDT | Special Weather Statement | MPX | Isanti | 25 min |
| Aug 4, 12:41 AM CDT | Special Weather Statement | MPX | Mille Lacs | 34 min |
| Aug 4, 12:43 AM CDT | Special Weather Statement | MPX | Isanti | 32 min |
| Aug 4, 1:15 AM CDT | Special Weather Statement | MPX | Kanabec | 30 min |
| Aug 4, 12:58 AM CDT | Special Weather Statement | MPX | Polk | 32 min |
| Aug 4, 1:49 AM CDT | Special Weather Statement | MPX | Barron | 26 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2018Severe Thunderstorm Warnings in Wisconsin, 2018Every severe thunderstorm warning in 2018
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.