Alert archive / Arkansas / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 91, NWS Little Rock, AR
NWS Little Rock, AR issued this severe thunderstorm warning at Apr 21, 2017, 7:57 AM CDT for 4 counties in Arkansas. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 21, 2017, 7:57 AM CDT (12:57 UTC)
- Expired
- Apr 21, 2017, 8:45 AM CDT
- In force
- 48 min
- Issued by
- NWS Little Rock, AR
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Johnson County, AR, Logan County, AR, Pope County, AR, Yell County, AR
The radar
The Western Arkansas radar (KSRX), 87 km from the middle of the area, began a volume at 12:56 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
Springfield, MO (KSGF), launched 12:00Z, 1.0 hours before the alert went out and 180 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
- 637 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- -171 m²/s²
- 0-3 km storm-relative helicity
- -150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Little Rock, AR issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 7:29 AM CDT | Special Weather Statement | LZK | Johnson | 46 min |
| Apr 21, 9:58 AM CDT | River Flood Warning | LZK | Independence, Jackson, Lawrence | 49 days |
| Apr 21, 1:13 PM CDT | Special Weather Statement | LZK | Logan, Scott, Yell | 47 min |
| Apr 21, 1:24 PM CDT | Severe Thunderstorm Warning | LZK | Logan, Scott, Yell | 51 min |
| Apr 21, 1:54 PM CDT | Special Weather Statement | LZK | Johnson | 51 min |
| Apr 21, 2:14 PM CDT | Special Weather Statement | LZK | Conway, Faulkner, Pope, Van Buren | 46 min |
| Apr 21, 2:20 PM CDT | Areal Flood Warning | LZK | Baxter, Fulton | 115 min |
| Apr 21, 2:26 PM CDT | Special Weather Statement | LZK | Searcy, Stone | 49 min |
| Apr 21, 2:47 PM CDT | Areal Flood Advisory | LZK | Boone, Marion, Newton, Searcy | 3 hr |
Nearby
Severe Thunderstorm Warnings in Arkansas, 2017Every severe thunderstorm warning in 2017
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.