Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 40, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 9, 2020, 5:51 AM CDT for Saint Croix County, Wisconsin. It was in force for 13 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
- Jul 9, 2020, 5:51 AM CDT (10:51 UTC)
- Expired
- Jul 9, 2020, 6:04 AM CDT
- In force
- 13 min
- Issued by
- NWS Twin Cities, MN
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Saint Croix County, WI
The radar
The Minneapolis radar (KMPX), 83 km from the middle of the area, began a volume at 10:50 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
Minneapolis, MN (KMPX), launched 00:00Z, 10.9 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
- 2332 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 1764 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
613
WUUS53 KMPX 091051
SVRMPX
WIC109-091115-
/O.NEW.KMPX.SV.W.0040.200709T1051Z-200709T1115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
551 AM CDT Thu Jul 9 2020
The National Weather Service in The Twin Cities has issued a
* Severe Thunderstorm Warning for...
Southern St. Croix County in west central Wisconsin...
* Until 615 AM CDT.
* At 550 AM CDT, a severe thunderstorm was located near Roberts, or
near River Falls, moving east at 30 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
River Falls, Hammond, Baldwin, Roberts and Woodville.
This includes Interstate 94 in Wisconsin between mile markers 6 and
24.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4488 9265 4495 9269 4510 9238 4489 9226
TIME...MOT...LOC 1050Z 251DEG 27KT 4494 9259
HAIL...1.25IN
WIND...60MPH
$$
TDH2 follow-up statements
031
WWUS53 KMPX 091100
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
600 AM CDT Thu Jul 9 2020
WIC109-091115-
/O.CON.KMPX.SV.W.0040.000000T0000Z-200709T1115Z/
St. Croix WI-
600 AM CDT Thu Jul 9 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 AM CDT
FOR SOUTHWESTERN ST. CROIX COUNTY...
At 600 AM CDT, a severe thunderstorm was located over Hammond, or 9
miles northeast of River Falls, moving east at 30 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Hammond, Baldwin and Roberts.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4491 9257 4497 9265 4509 9241 4492 9236
TIME...MOT...LOC 1100Z 251DEG 27KT 4496 9249
HAIL...1.00IN
WIND...60MPH
$$
TDH118
WWUS53 KMPX 091104
SVSMPX
Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
604 AM CDT Thu Jul 9 2020
WIC109-091114-
/O.CAN.KMPX.SV.W.0040.000000T0000Z-200709T1115Z/
St. Croix WI-
604 AM CDT Thu Jul 9 2020
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ST. CROIX COUNTY
IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled. However small hail and heavy rain are still possible
with this thunderstorm.
LAT...LON 4491 9257 4497 9265 4509 9241 4492 9236
TIME...MOT...LOC 1103Z 251DEG 27KT 4497 9244
$$
TDHThe office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 8, 11:54 PM CDT | Special Weather Statement | MPX | Rusk | 51 min |
| Jul 9, 5:14 AM CDT | Special Weather Statement | MPX | Chippewa | 31 min |
| Jul 9, 5:15 AM CDT | Special Weather Statement | MPX | Eau Claire | 30 min |
| Jul 9, 5:30 AM CDT | Special Weather Statement | MPX | Polk | 45 min |
| Jul 9, 5:38 AM CDT | Severe Thunderstorm Warning | MPX | Pierce, Saint Croix | 24 min |
| Jul 9, 5:48 AM CDT | Special Weather Statement | MPX | Chippewa, Eau Claire | 42 min |
| Jul 9, 6:04 AM CDT | Severe Thunderstorm Warning | MPX | Polk, Saint Croix | 14 min |
| Jul 9, 6:19 AM CDT | Special Weather Statement | MPX | Saint Croix | 41 min |
| Jul 9, 7:10 AM CDT | Special Weather Statement | MPX | Dunn | 35 min |
| Jul 9, 7:20 AM CDT | Special Weather Statement | MPX | Eau Claire | 25 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 2020Every severe thunderstorm warning in 2020
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.