Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 146, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 4, 2018, 5:55 PM CDT for Freeborn County, Minnesota. 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
- Sep 4, 2018, 5:55 PM CDT (22:55 UTC)
- Expired
- Sep 4, 2018, 7:00 PM CDT
- In force
- 65 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Freeborn County, MN
The radar
The Minneapolis radar (KMPX), 133 km from the middle of the area, began a volume at 22:57 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 |
|---|---|---|---|
| Sep 4, 6:38 PM CDT | TORNADO | 1 Sw Myrtle, MN | RECEIVED CALL FROM FREEBORN COUNTY EMERGENCY MANAGER THAT A DRIVER ON HWY 13 NEAR MYRTLE SAW A TORNADO TO THE SOUTH OF MYRTLE. TORNADO WAS IN PROGRESS. NO PHOTO WAS PROVIDED. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 4, 3:35 PM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 10.9 hours before the alert went out and 133 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
- 106 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 667 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
165
WUUS53 KMPX 042255
SVRMPX
MNC047-050000-
/O.NEW.KMPX.SV.W.0146.180904T2255Z-180905T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
555 PM CDT TUE SEP 4 2018
The National Weather Service in The Twin Cities has issued a
* Severe Thunderstorm Warning for...
Eastern Freeborn County in south central Minnesota...
* Until 700 PM CDT.
* At 554 PM CDT, a severe thunderstorm was located near Emmons, or 9
miles west of Northwood, moving northeast at 30 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Albert Lea, Glenville, Emmons, London, Hollandale, Hayward, Twin
Lakes and Myrtle.
This includes the following highways...
Interstate 35 between mile markers 1 and 16.
Interstate 90 between mile markers 158 and 173.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
A Tornado Watch remains in effect until 1000 PM CDT for south central
Minnesota.
LAT...LON 4385 9320 4384 9305 4350 9305 4350 9353
4351 9353
TIME...MOT...LOC 2254Z 218DEG 27KT 4348 9341
TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
$$
ETA1 follow-up statement
416 WWUS53 KMPX 042348 SVSMPX Severe Weather Statement National Weather Service Twin Cities/Chanhassen MN 648 PM CDT TUE SEP 4 2018 MNC047-050000- /O.CON.KMPX.SV.W.0146.000000T0000Z-180905T0000Z/ Freeborn MN- 648 PM CDT TUE SEP 4 2018 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR EASTERN FREEBORN COUNTY... At 648 PM CDT, a severe thunderstorm was located near Brookside Campground, or 9 miles northwest of Austin, moving northeast at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... London and Myrtle. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && A Tornado Watch remains in effect until 1000 PM CDT for south central Minnesota. LAT...LON 4350 9326 4385 9316 4384 9305 4350 9305 TIME...MOT...LOC 2348Z 218DEG 27KT 4380 9307 TORNADO...POSSIBLE HAIL...<.75IN WIND...60MPH $$ ETA
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 3:15 AM CDT | Flash Flood Watch | MPX | Blue Earth, Brown, Dakota, Faribault, Freeborn, Goodhue and 7 more | 25 hr |
| Sep 4, 2:15 PM CDT | Special Weather Statement | MPX | Freeborn | 30 min |
| Sep 4, 3:29 PM CDT | Tornado Warning | MPX | Steele | 31 min |
| Sep 4, 6:10 PM CDT | Tornado Warning | MPX | Freeborn | 35 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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.