Alert archive / Colorado / Tornado Warnings in 2023
Tornado Warning 2, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Apr 25, 2023, 2:42 PM MDT for Weld County, Colorado. It was in force for 33 min. 2 reports 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
- Apr 25, 2023, 2:42 PM MDT (20:42 UTC)
- Expired
- Apr 25, 2023, 3:15 PM MDT
- In force
- 33 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Tornado
- Observed
- Hail
- 0.75 in
County Weld County, CO
The radar
The Denver radar (KFTG), 37 km from the middle of the area, began a volume at 20:43 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 |
|---|---|---|---|
| Apr 25, 2:45 PM MDT | TORNADO | 4 Sw Prospect Valley, CO | CORRECTS PREVIOUS TORNADO REPORT FROM 4 SW PROSPECT VALLEY. |
| Apr 25, 2:50 PM MDT | TORNADO | 4 Sw Prospect Valley, CO |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.7 hours before the alert went out and 344 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 947 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -86 m²/s²
- 0-3 km storm-relative helicity
- -135 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
295
WFUS55 KBOU 252042
TORBOU
COC123-252115-
/O.NEW.KBOU.TO.W.0002.230425T2042Z-230425T2115Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
242 PM MDT Tue Apr 25 2023
The National Weather Service in Denver Colorado has issued a
* Tornado Warning for...
South central Weld County in northeastern Colorado...
* Until 315 PM MDT.
* At 242 PM MDT, a confirmed tornado was located near Keenesburg, or
27 miles southeast of Greeley, moving south at 20 mph.
HAZARD...Damaging tornado.
SOURCE...Weather spotters confirmed tornado.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* The tornado will be near...
Prospect Valley around 245 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.
&&
LAT...LON 4018 10454 4017 10433 4001 10427 4001 10455
TIME...MOT...LOC 2042Z 357DEG 16KT 4008 10448
TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN
$$
AD2 follow-up statements
274
WWUS55 KBOU 252054
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
254 PM MDT Tue Apr 25 2023
COC123-252115-
/O.CON.KBOU.TO.W.0002.000000T0000Z-230425T2115Z/
Weld CO-
254 PM MDT Tue Apr 25 2023
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 PM MDT FOR SOUTH
CENTRAL WELD COUNTY...
At 254 PM MDT, a confirmed tornado was located 4 miles southwest of
Prospect Valley, or 30 miles southeast of Greeley, moving south at 20
mph.
HAZARD...TORNADO.
SOURCE...Weather spotters confirmed tornado.
IMPACT...Expect damage to mobile homes, roofs, and vehicles.
This tornadic thunderstorm will remain over mainly rural areas of
south central Weld County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.
&&
LAT...LON 4012 10453 4013 10431 4001 10427 4001 10455
TIME...MOT...LOC 2054Z 357DEG 16KT 4003 10448
TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN
$$
AD850
WWUS55 KBOU 252114
SVSBOU
Severe Weather Statement
National Weather Service Denver CO
314 PM MDT Tue Apr 25 2023
COC123-252123-
/O.EXP.KBOU.TO.W.0002.000000T0000Z-230425T2115Z/
Weld CO-
314 PM MDT Tue Apr 25 2023
...THE TORNADO WARNING FOR SOUTH CENTRAL WELD COUNTY WILL EXPIRE AT
315 PM MDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However small hail
is still possible with this thunderstorm.
Remember, a Severe Thunderstorm Warning still remains in effect for
Weld and Adams counties including cities such as Prospect Valley and
Keenesburg.
LAT...LON 4012 10453 4013 10431 4001 10427 4001 10455
TIME...MOT...LOC 2113Z 357DEG 16KT 3995 10447
$$
ADThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 1:51 PM MDT | Special Weather Statement | BOU | Adams | 39 min |
| Apr 25, 2:27 PM MDT | Special Weather Statement | BOU | Adams | 48 min |
| Apr 25, 2:32 PM MDT | Tornado Warning | BOU | Adams, Weld | 14 min |
| Apr 25, 3:11 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 34 min |
| Apr 25, 3:19 PM MDT | Special Weather Statement | BOU | Broomfield | 26 min |
| Apr 25, 3:20 PM MDT | Special Weather Statement | BOU | Adams, Denver | 40 min |
| Apr 25, 4:30 PM MDT | Areal Flood Advisory | BOU | Weld | 3 hr |
Nearby
Tornado Warnings in Colorado, 2023Every tornado warning in 2023Tornadoes in 2023
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.